some tests

.gitignore

@@ -1,5 +1,2 @@
-microgui
 *.o
-test/test
-**/compile_commands.json
-**/.cache
+build/*

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "lib/raylib.c3l"]
+	path = lib/raylib.c3l
+	url = https://github.com/NexushasTaken/raylib.c3l

ARCHITECTURE.md

@@ -0,0 +1,184 @@
+## High level overview
+
+Under the hood every element has an id, this id allows the library to store state
+between frames.
+Elements are also cached such that when the ui tree is rebuilt at the beginning of
+every frame the element data structure doesn't have to be rebuilt.
+
+Elements are arranged in a tree, nodes are container elements that can contain other
+elements, leafs are elements that cannot contain other elements.
+
+Every element has a size and a position, containers also have to keep track of their
+layout information and some other state.
+
+Elements can push commands into the draw stack, which is a structure that contains
+all the draw commands that the user application has to perform do display the ui
+correctly, such commands include drawing lines, rectangles, sprites, text, etc.
+
+
+```text
+            +-----------+
+            | ug_init() |
+            +-----+-----+
+                  |
+                  |
+                  |
+        +---------v----------+
+        |ug_input_keyboard() |
+        |ug_input_mouse()    <----+
+        |ug_input_clipboard()|    |
+        |        ...         |    |
+        +---------+----------+    |
+                  |               |
+                  |               |
+          +-------v--------+      |
+          |ug_frame_begin()|      |
+          +-------+--------+      |
+                  |               |
+                  |               |
+        +---------v----------+    |
+        |ug_window_start()   |    |
+   +---->ug_container_start()|    |
+   |    |ug_div_start()      |    |
+   |    |        ...         |    |
+   |    +---------+----------+    |
+   |              |               |
+   |              |               |
+multiple +--------v---------+     |
+ times   |ug_layout_row()   |     |
+   |     |ug_layout_column()|     |
+   |     |ug_layout_float() |     |
+   |     |       ...        |     |
+   |     +--------+---------+     |
+   |              |               |
+   |              |               |
+   |       +------v------+        |
+   |       |ug_button()  |        |
+   |       |ug_text_box()|        |
+   |       |ug_slider()  |        |
+   |       |     ...     |        |
+   |       +------+------+        |
+   |              |               |
+   +--------------+               |
+                  |               |
+         +--------v---------+     |
+         |ug_window_end()   |     |
+         |ug_container_end()|     |
+         |ug_div_end()      |     |
+         |       ...        |     |
+         +--------+---------+     |
+                  |               |
+                  |               |
+                  |               |
+           +------v-------+       |
+           |ug_frame_end()|       |
+           +------+-------+       |
+                  |               |
+                  |               |
+                  |               |
+           +------v-------+       |
+           |user draws the|       |
+           |      ui      +-------+
+           +------+-------+
+                  |
+                  |quit
+                  |
+           +------v-------+
+           | ug_destroy() |
+           +--------------+
+```
+
+### Layouting
+
+Layouting happens in a dynamic grid, when a new element is inserted in a non-floating
+manner it reserves a space in the grid, new elements are placed following this grid.
+
+Every div has two points of origin, one for the row layout and one for the column
+layout, named origin_r and origin_c respectively
+
+origin_r is used when the row layout is used and it is used to position the child
+elements one next to the other, as such it always points to the top-right edge
+of the last row element
+
+```text
+Layout: row
+#: lost space
+              Parent div
+x---------------------------------+
+|[origin_c]                       |
+|[origin_r]                       |
+|                                 |
+|                                 |
+|                                 |
+|                                 |
+|                                 |
+|                                 |
+|                                 |
++---------------------------------+
+
+              Parent div
++-----x---------------------------+
+|     |[origin_r]                 |
+| E1  |                           |
+|     |                           |
+x-----+---------------------------+
+|[origin_c]                       |
+|     |                           |
+|     |                           |
+|     |                           |
+|     |                           |
+|     |                           |
++-----+---------------------------+
+
+              Parent div
++-----+----------+-----x----------+
+|     |    E2    |     |[origin_r]|
+|  E1 +----------+     |          |
+|     |##########| E3  |          |
++-----+##########|     |          |
+|################|     |          |
++----------------x-----+----------+
+|                [origin_c]       |
+|                |                |
+|                |                |
+|                |                |
++----------------+----------------+
+```
+
+TODO: handle when the content overflows the div
+- Use a different concept, like a view or relative space, for example the child
+div could have position `[0,0]` but in reality it is relative to the origin of the
+parent div
+- each div could have a view and a total area of the content, when drawing everything
+is clipped to the view and scrollbars are shown
+- individual elements accept dimensions and the x/y coordinates could be interpreted
+as offset if the layout is row/column or absolute coordinates if the leayout is floating
+
+A div can be marked resizeable or fixed, and static or dynamic. The difference being
+that resizeable adds a resize handle to the div and dynamic lets the content overflow
+causing scrollbars to be drawn
+
+### Notes
+
+How elements determine if they have focus or not
+
+```C
+// in begin_{container} code
+calculate focus
+set has_focus property
+
+
+
+// in the element code
+if(PARENT_HAS_FOCUS()) {
+	update stuff
+} else {
+	fast path to return
+}
+```
+
+How to get ids:
+	1. use a name for each element
+	2. supply an id for each element
+	3. use a macro and the line position as id and then hash it
+	4. use a macro, get the code line and hash it

RENDERER

@@ -1,4 +0,0 @@
-Divide up the OpenGL renderer into three parts, one part that draws simple shapes,
-another that only draws text and one that is responsible for drawing icons and
-mapping sprites in general, this way all the texture atlases are separate and
-everything is done within 3 draw calls

TODO

@@ -0,0 +1,7 @@
+# TODOs, semi-random sorting
+[ ] Implement glyph draw command
+[ ] Implement div.view and scrollbars
+[ ] Port font system from C to C3 (rewrite1)
+[ ] Update ARCHITECTURE.md
+[ ] Write a README.md
+[ ] Use an arena allocator for cache

def_style.h

@@ -1,40 +0,0 @@
-#ifndef _UG_DEF_STYLE_H
-#define _UG_DEF_STYLE_H
-
-#include "ugui.h"
-
-#define SZ_INT(x)            x.size.i
-
-static const ug_style_t default_style = {
-	.color  = {
-		.bg   = RGB_FORMAT(0x131313),
-		.fg   = RGB_FORMAT(0xffffff),
-	},
-	.margin = SIZE_PX(3),
-	.border = {
-		.color = RGB_FORMAT(0xf50a00),
-		.size  = SIZE_PX(2),
-	},
-	.title = {
-		.color = {
-			.bg = RGB_FORMAT(0xbbbbbb),
-			.fg = RGB_FORMAT(0xffff00),
-		},
-		.height    = SIZE_PX(20),
-		.font_size = SIZE_PX(14),
-	},
-	.btn = {
-		.color = {
-			.act = RGB_FORMAT(0x440044),
-			.bg  = RGB_FORMAT(0x006600),
-			.fg  = RGB_FORMAT(0xffff00),
-			.sel = RGB_FORMAT(0x0a0aff),
-			.br  = RGB_FORMAT(0xff00ff),
-		},
-		.font_size = SIZE_PX(10),
-		.border    = SIZE_PX(5),
-	},
-};
-
-
-#endif

font-to-atlas/.gitignore

@@ -1,3 +0,0 @@
-*.ff
-*.png
-font-to-atlas

font-to-atlas/Makefile

@@ -1,2 +0,0 @@
-font-to-atlas: main.c ff.c ff.h
-	cc -lm -g main.c ff.c -o font-to-atlas

font-to-atlas/ff.c

@@ -1,118 +0,0 @@
-#include <arpa/inet.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <stdio.h>
-
-#include "ff.h"
-
-
-#define MAX(a,b) a>b?a:b
-
-
-struct ff * ff_new(uint32_t width, uint32_t height)
-{
-	uint64_t size = (uint64_t)width*height*sizeof(struct ff);
-	struct ff *image = malloc(sizeof(struct ff) + size);
-	if (!image)
-		return NULL;
-	memcpy(image->magic, "farbfeld", 8);
-	image->width  = htonl(width);
-	image->height = htonl(height);
-
-	// create a transparent image
-	memset(image->pixels, 0, size);
-
-	return image;
-}
-
-
-uint64_t ff_bytes(const struct ff *image)
-{
-	if (!image)
-		return 0;
-	return sizeof(struct ff)+(uint64_t)ntohl(image->width)*ntohl(image->height)*sizeof(struct ff_px);
-}
-
-
-struct ff * ff_resize(struct ff *image, uint32_t width, uint32_t height)
-{
-	struct ff *new = NULL;
-	int64_t size = sizeof(struct ff)+(int64_t)width*height*sizeof(uint64_t);
-	if (image) {
-		int64_t old_size = ff_bytes(image);
-		if (old_size == size)
-			return image;
-
-		new = realloc(image, size);
-		if (!new)
-			return NULL;
-
-		uint32_t old_width = ntohl(new->width);
-		uint32_t old_height = ntohl(new->height);
-		if (size-old_size > 0) {
-			struct ff_px *b = new->pixels;
-			memset(&b[old_width*old_height], 0, size-old_size);
-			for (int64_t c = (int64_t)old_height-1; c >= 0; c--) {
-				memmove(&b[width*c], &b[old_width*c], sizeof(struct ff_px)*old_width);
-				memset(&b[c*old_width], 0, sizeof(struct ff_px)*(c*width-c*old_width));
-			}
-		} else {
-		}
-		new->height = htonl(height);
-		new->width = htonl(width);
-
-	} else {
-		new = ff_new(width, height);
-	}
-
-	return new;
-}
-
-
-int ff_verify (const struct ff *image)
-{
-	if (!image || strncmp("farbfeld", (char*)image->magic, 8))
-		return 1;
-	return 0;
-}
-
-
-int ff_free(struct ff *image)
-{
-	if (!ff_verify(image))
-		free(image);
-	return 0;
-}
-
-
-// overlays the bitmap containing only 1 8bpp channel to the image starting at (x,y)
-// be stands for the data is already big endian
-int ff_overlay_8r(struct ff **image, const uint8_t *bitmap, uint32_t x, uint32_t y, uint32_t w, uint32_t h)
-{
-	if (!image || !*image)
-		return 1;
-
-	uint32_t iw = ntohl((*image)->width), ih = ntohl((*image)->height);
-	*image = ff_resize(*image, MAX(iw, x+w), MAX(ih, y+h));
-	if (!image)
-		return -1;
-	iw = ntohl((*image)->width);
-	ih = ntohl((*image)->height);
-
-	for (uint32_t r = 0; r < h; r++) {
-		for (uint32_t c = 0; c < w; c++) {
-			uint8_t col = bitmap[r*w+c];
-			struct ff_px p = {
-				.r = 0xffff,
-				.g = 0xffff,
-				.b = 0xffff,
-				.a = htons(257*col)
-			};
-			(*image)->pixels[(r+y)*iw + (c+x)] = p;
-		}
-	}
-
-	return 0;
-}

font-to-atlas/ff.h

@@ -1,25 +0,0 @@
-#ifndef _FARBFELD_EZ_H
-#define _FARBFELD_EZ_H
-
-
-#include <stdint.h>
-
-
-struct __attribute__((packed)) ff_px { uint16_t r, g, b, a; };
-
-struct __attribute__((packed)) ff {
-	int8_t magic[8];
-	uint32_t width, height;
-	struct ff_px pixels[];
-};
-
-
-struct ff * ff_new(uint32_t width, uint32_t height);
-int ff_verify (const struct ff *image);
-int ff_free(struct ff *image);
-uint64_t ff_bytes(const struct ff *image);
-struct ff * ff_resize(struct ff *image, uint32_t width, uint32_t height);
-int ff_overlay_8r(struct ff **image, const uint8_t *bitmap, uint32_t x, uint32_t y, uint32_t w, uint32_t h);
-
-
-#endif

font-to-atlas/main.c

@@ -1,107 +0,0 @@
-#define _POSIX_C_SOURCE 200809l
-#define STB_TRUETYPE_IMPLEMENTATION
-#define STBTT_STATIC
-
-#include <sys/mman.h>
-
-#include <stdio.h>
-#include <stdint.h>
-#include <unistd.h>
-#include <errno.h>
-#include <err.h>
-
-#include "stb_truetype.h"
-#include "ff.h"
-
-
-const int font_size = 32;
-
-
-void map_file(const unsigned char **str, int *size, const char *path)
-{
-	if (!path)
-		err(EXIT_FAILURE, "NULL filename");
-	FILE *fp = fopen(path, "r");
-	if (!fp)
-		err(EXIT_FAILURE, "Cannot open file %s", path);
-	*size = lseek(fileno(fp), 0, SEEK_END);
-	if (*size == (off_t)-1)
-		err(EXIT_FAILURE, "lseek failed");
-	*str = mmap(0, *size, PROT_READ, MAP_PRIVATE, fileno(fp), 0);
-	if (*str == (void*)-1)
-		err(EXIT_FAILURE, "mmap failed");
-	if (fclose(fp))
-		err(EXIT_FAILURE, "Error closing file");
-}
-
-
-int main(int argc, char *argv[])
-{
-	if (argc < 2)
-		return EXIT_FAILURE;
-	int len;
-	const unsigned char *map;
-	map_file(&map, &len, argv[1]);
-
-	stbtt_fontinfo font;
-	stbtt_InitFont(&font, map, stbtt_GetFontOffsetForIndex(map, 0));
-
-	// all this is to get the font bounding box in pixels
-	float font_scale = 1.0;
-	font_scale = stbtt_ScaleForPixelHeight(&font, font_size);
-	int ascent, descent, linegap;
-	stbtt_GetFontVMetrics(&font, &ascent, &descent, &linegap);
-	int x0,y0,x1,y1;
-	int bound_w, bound_h;
-	stbtt_GetFontBoundingBox(&font, &x0, &y0, &x1, &y1);
-
-	printf("font_scale: %f\n", font_scale);
-	printf("x0:%d y0:%d x1:%d y1:%d\n",x0,y0,x1,y1);
-
-	int baseline = font_scale * -y0;
-	bound_h = (baseline+font_scale*y1) - (baseline+font_scale*y0);
-	bound_w = (font_scale*x1) - (font_scale*x0);
-	baseline = bound_h - baseline;
-	unsigned char *bitmap = malloc(bound_h*bound_w);
-	if (!bitmap)
-		err(EXIT_FAILURE, "Cannot allocate bitmap");
-
-	printf("bounding h:%d w:%d\n", bound_h, bound_w);
-	printf("baseline: %d\n", baseline);
-
-	struct ff *image = ff_new(0, 0);
-
-	// get all ascii
-	int x = 0, y = 0, maxwidth = 64*bound_w;
-	for (unsigned int i = 0; i <= 0x7F; i++) {
-		int x0,y0,x1,y1,w,h,l,a, ox,oy;
-		int g = stbtt_FindGlyphIndex(&font, i);
-
-		stbtt_GetGlyphBitmapBoxSubpixel(&font, g, font_scale, font_scale, 0, 0, &x0, &y0, &x1, &y1);
-		w = x1 - x0;
-		h = y1 - y0;
-		//printf("%d\n", y0);
-		stbtt_GetGlyphHMetrics(&font, g, &a, &l);
-		stbtt_MakeGlyphBitmapSubpixel(&font, bitmap, w, h, w, font_scale, font_scale, 0, 0, g);
-		//printf("'%c' -> l*scale:%.0f, y0:%d\n", i, font_scale*l, bound_h+y0);
-		ox = font_scale*l;
-		oy = bound_h+y0;
-		ff_overlay_8r(&image, bitmap, x+ox, y+oy, w, h);
-
-		x += bound_w;
-		if (x >= maxwidth) y += bound_h;
-		x %= maxwidth;
-
-	}
-
-	FILE *fp = fopen("out.ff", "w");
-	if (fp) {
-		fwrite(image, 1, ff_bytes(image), fp);
-		fclose(fp);
-	}
-
-	free(bitmap);
-	ff_free(image);
-	munmap((void *)map, len);
-	return 0;
-}

input.c

@@ -1,40 +0,0 @@
-#include "ugui.h"
-
-/*=============================================================================*
- *                            Input Handling                                   *
- *=============================================================================*/
-
-
-#define TEST_CTX(ctx) { if (!ctx) return -1; }
-
-
-int ug_input_mousemove(ug_ctx_t *ctx, int x, int y)
-{
-	TEST_CTX(ctx)
-	if (x < 0 || y < 0)
-		return 0;
-	
-	ctx->mouse.pos = (ug_vec2_t){.x = x, .y = y};
-
-	return 0;
-}
-
-
-int ug_input_mousedown(ug_ctx_t *ctx, unsigned int mask)
-{
-	TEST_CTX(ctx);
-
-	ctx->mouse.update  |= mask;
-
-	return 0;
-}
-
-
-int ug_input_mouseup(ug_ctx_t *ctx, unsigned int mask)
-{
-	TEST_CTX(ctx);
-
-	ctx->mouse.update |= mask;
-
-	return 0;
-}

lib/raylib.c3l

@@ -0,0 +1 @@
+Subproject commit c7ebe054ce16136c1128fab54fcce4921044293e

opengl-ren/.gitignore

@@ -1,2 +0,0 @@
-a.out
-gl

opengl-ren/Makefile

@@ -1,5 +0,0 @@
-CFLAGS  = -Wall -Wextra -Wpedantic -std=c11 -g
-LDFLAGS = -lSDL2 -lGLEW -lGL
-
-gl: main.c
-	gcc ${CFLAGS} ${LDFLAGS} main.c -o gl

opengl-ren/README

@@ -1,2 +0,0 @@
-since I've never worked with opengl I made this folder as a little test environment
-for an SDL-OpenGL renderer

opengl-ren/fragment.glsl

@@ -1,12 +0,0 @@
-#version 330
-
-flat in vec4 out_color;
-in vec2 texture_coord;
-uniform sampler2D texture_sampler;
-
-out vec4 color;
-
-void main()
-{
-	color = texture(texture_sampler, texture_coord) + out_color;
-}

opengl-ren/main.c

@@ -1,521 +0,0 @@
-#define _POSIX_C_SOURCE 200809l
-
-#include <sys/mman.h>
-#include <arpa/inet.h>
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdint.h>
-#include <unistd.h>
-#include <errno.h>
-#include <err.h>
-
-#include <SDL2/SDL.h>
-#include <GL/glew.h>
-#include <SDL2/SDL_opengl.h>
-
-
-#define GLSL_VERT_SHADER "vertex.glsl"
-#define GLSL_FRAG_SHADER "fragment.glsl"
-#define PACKED __attribute__((packed))
-
-
-const int vertindex = 0;
-const int colindex  = 1;
-const int textindex = 2;
-
-struct {
-	SDL_Window *w;
-	SDL_GLContext *gl;
-	GLuint gl_vertbuffer;
-	GLuint gl_program;
-	GLuint font_texture;
-} ren = {0};
-
-typedef struct PACKED {
-	union { GLfloat x, u; };
-	union { GLfloat y, v; };
-} vec2;
-
-typedef struct PACKED {
-	union { GLfloat x, r; };
-	union { GLfloat y, g; };
-	union { GLfloat z, b; };
-	union { GLfloat w, a; };
-} vec4;
-
-// a vertex has a position and a color
-struct PACKED vertex {
-	vec2 pos;
-	vec2 texture;
-	vec4 color;
-};
-
-
-int w_height(SDL_Window *);
-int w_width(SDL_Window *);
-
-
-// this just descrives a farbfeld image
-// https://tools.suckless.org/farbfeld/
-struct PACKED _ff {
-	uint8_t magic[8];
-	uint32_t w, h;
-	uint64_t bytes[];
-};
-const int gw = 7, gh = 9;
-unsigned int fw, fh;
-
-
-struct {
-	struct vertex *v;
-	int size, idx;
-	int prev_idx;
-	unsigned long int hash, prev_hash;
-} vstack = {0};
-
-
-void grow_stack(int step)
-{
-	vstack.v = realloc(vstack.v, (vstack.size+step)*sizeof(*(vstack.v)));
-	if(!vstack.v)
-		err(-1, "Could not allocate stack #S: %s", strerror(errno));
-	memset(&(vstack.v[vstack.size]), 0, step*sizeof(*(vstack.v)));
-	vstack.size += step;
-}
-
-void push(struct vertex v)
-{
-	if (vstack.idx >= vstack.size)
-		grow_stack(6);
-	vstack.v[vstack.idx++] = v;
-}
-
-
-void update_hash()
-{
-	if (!vstack.idx)
-		return;
-	unsigned int hash = 0x5400F1B3;
-	unsigned char *v = (unsigned char *)vstack.v;
-	int size = vstack.idx;
-
-	for (; size; size--) {
-		hash += v[size-1];
-		hash += hash << 10;
-		hash ^= hash >> 6;
-	}
-	hash += hash << 3;
-  	hash ^= hash >> 11;
-  	hash += hash << 15;
-
-	vstack.hash = hash;
-}
-
-
-void force_changed()
-{
-	vstack.prev_idx = 0;
-}
-
-
-int changed()
-{
-	return vstack.prev_idx != vstack.idx || vstack.prev_hash != vstack.hash;
-}
-
-
-int vstack_push_quad_c(int x, int y, int w, int h, vec4 color)
-{
-	// x4,y4        x3,y3
-	// +-------------+
-	// |(x,y)       /|
-	// |          /  |
-	// |   2    /    |
-	// |      /      |
-	// |    /        |
-	// |  /     1    |
-	// |/            |
-	// +-------------+
-	// x1,y1        x2,y2
-
-	int hw = w_width(ren.w)/2;
-	int hh = w_height(ren.w)/2;
-
-	float x1, x2, x3, x4;
-	float y1, y2, y3, y4;
-
-	x4 = x1 = (float)(x - hw)   / hw;
-	x2 = x3 = (float)(x+w - hw) / hw;
-	y4 = y3 = (float)(hh - y)   / hh;
-	y1 = y2 = (float)(hh - y-h) / hh;
-
-	push((struct vertex){ .pos.x=x1, .pos.y=y1, .color=color });
-	push((struct vertex){ .pos.x=x2, .pos.y=y2, .color=color });
-	push((struct vertex){ .pos.x=x3, .pos.y=y3, .color=color });
-	push((struct vertex){ .pos.x=x1, .pos.y=y1, .color=color });
-	push((struct vertex){ .pos.x=x3, .pos.y=y3, .color=color });
-	push((struct vertex){ .pos.x=x4, .pos.y=y4, .color=color });
-
-	return 0;
-}
-
-
-int vstack_push_quad_t(int x, int y, int w, int h, int u, int v)
-{
-	// x4,y4        x3,y3
-	// +-------------+
-	// |(x,y)       /|
-	// |          /  |
-	// |   2    /    |
-	// |      /      |
-	// |    /        |
-	// |  /     1    |
-	// |/            |
-	// +-------------+
-	// x1,y1        x2,y2
-
-	int hw = w_width(ren.w)/2;
-	int hh = w_height(ren.w)/2;
-
-	float x1, x2, x3, x4;
-	float y1, y2, y3, y4;
-
-	x1 = x4 = (float)(x - hw)   / hw;
-	x2 = x3 = (float)(x+w - hw) / hw;
-	y1 = y2 = (float)(hh - y-h) / hh;
-	y3 = y4 = (float)(hh - y)   / hh;
-
-	float u1, u2, u3, u4;
-	float v1, v2, v3, v4;
-
-	u1 = u4 = (float)(u)    / fw;
-	u2 = u3 = (float)(u+gw) / fw;
-	v1 = v2 = (float)(v+gh) / fh;
-	v3 = v4 = (float)(v)    / fh;
-
-	push((struct vertex){ .pos.x=x1, .pos.y=y1, .texture.x=u1, .texture.y=v1 });
-	push((struct vertex){ .pos.x=x2, .pos.y=y2, .texture.x=u2, .texture.y=v2 });
-	push((struct vertex){ .pos.x=x3, .pos.y=y3, .texture.x=u3, .texture.y=v3 });
-	push((struct vertex){ .pos.x=x1, .pos.y=y1, .texture.x=u1, .texture.y=v1 });
-	push((struct vertex){ .pos.x=x3, .pos.y=y3, .texture.x=u3, .texture.y=v3 });
-	push((struct vertex){ .pos.x=x4, .pos.y=y4, .texture.x=u4, .texture.y=v4 });
-
-	return 0;
-}
-
-
-void vstack_clear(void)
-{
-	vstack.prev_hash = vstack.hash;
-	vstack.prev_idx = vstack.idx;
-	vstack.idx = 0;
-}
-
-
-// copy the vertex buffer from system to video memory
-void ren_initvertbuffer()
-{
-	// generate a buffer id
-	glGenBuffers(1, &ren.gl_vertbuffer);
-	// tell opengl that we want to work on that buffer
-	glBindBuffer(GL_ARRAY_BUFFER, ren.gl_vertbuffer);
-	// copy the vertex data into the gpu memory, GL_STATIC_DRAW tells opengl
-	// that the data will be used for drawing (DRAW) and it will only be modified
-	// every frame (DYNAMIC)
-	glBufferData(GL_ARRAY_BUFFER, vstack.idx*sizeof(struct vertex), vstack.v, GL_DYNAMIC_DRAW);
-	// set the format of each vertex, in this case each vertex is made of 4
-	// coordinates, x y z w, where w is the clip coordinate, stride is
-	// sizeof(vec4) since every postition vertex there is a vector representing
-	// color data
-	// set the position data of the vertex buffer, and bind it as input to the
-	// vertex shader with an index of 0
-	glEnableVertexAttribArray(vertindex);
-	glVertexAttribPointer(vertindex, 2, GL_FLOAT, GL_FALSE, sizeof(struct vertex), 0);
-	// set the color data of the vertex buffer to index 1
-	// vertex attribute is the OpenGL name given to a set of vertices which are
-	// given as input to a vertext shader, in a shader an array of vertices is
-	// always referred to by index and not by pointer or other manners, indices
-	// go from 0 to 15
-	glEnableVertexAttribArray(colindex);
-	glVertexAttribPointer(colindex, 4, GL_FLOAT, GL_FALSE, sizeof(struct vertex), (void*)(2*sizeof(vec2)));
-	// texture uv data
-	glEnableVertexAttribArray(textindex);
-	glVertexAttribPointer(textindex, 2, GL_FLOAT, GL_FALSE, sizeof(struct vertex), (void*)sizeof(vec2));
-	// reset the object bind so not to create errors
-	glBindBuffer(GL_ARRAY_BUFFER, 0);
-}
-
-
-void map_file(const char **str, int *size, const char *fname)
-{
-	FILE *fp = fopen(fname, "r");
-	*size = lseek(fileno(fp), 0, SEEK_END);
-	*str = mmap(0, *size, PROT_READ, MAP_PRIVATE, fileno(fp), 0);
-	fclose(fp);
-}
-
-
-// print shader compilation errors
-int debug_shader(GLuint shader)
-{
-	GLint status;
-	glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
-	if (status != GL_FALSE)
-		return 0;
-
-	GLint log_length;
-	glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_length);
-
-	GLchar *log_str = malloc((log_length + 1)*sizeof(GLchar));
-	glGetShaderInfoLog(shader, log_length, NULL, log_str);
-
-	const char *shader_type_str = NULL;
-	GLint shader_type;
-	glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type);
-	switch(shader_type) {
-	case GL_VERTEX_SHADER:   shader_type_str = "vertex";   break;
-	case GL_GEOMETRY_SHADER: shader_type_str = "geometry"; break;
-	case GL_FRAGMENT_SHADER: shader_type_str = "fragment"; break;
-	}
-
-	fprintf(stderr, "Compile failure in %s shader:\n%s\n", shader_type_str, log_str);
-	free(log_str);
-	return -1;
-}
-
-
-// print program compilation errors
-int debug_program(GLuint prog)
-{
-	GLint status;
-	glGetProgramiv (prog, GL_LINK_STATUS, &status);
-	if (status != GL_FALSE)
-		return 0;
-
-	GLint log_length;
-	glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &log_length);
-
-	GLchar *log_str = malloc((log_length + 1)*sizeof(GLchar));
-	glGetProgramInfoLog(prog, log_length, NULL, log_str);
-	fprintf(stderr, "Linker failure: %s\n", log_str);
-	free(log_str);
-
-	return -1;
-}
-
-
-void ren_initshaders()
-{
-	GLuint gl_vertshader, gl_fragshader;
-
-	// initialize the vertex shader and get the corresponding id
-	gl_vertshader = glCreateShader(GL_VERTEX_SHADER);
-	if (!gl_vertshader)
-		err(-1, "Could not create the vertex shader");
-
-	// map the shader file into memory
-	const char *vshader_str = NULL;
-	int vshader_size;
-	map_file(&vshader_str, &vshader_size, GLSL_VERT_SHADER);
-
-	// get the shader into opengl
-	glShaderSource(gl_vertshader, 1, &vshader_str, NULL);
-	// compile the shader
-	glCompileShader(gl_vertshader);
-	if (debug_shader(gl_vertshader))
-		exit(EXIT_FAILURE);
-
-	// do the same for the fragment shader
-	// FIXME: make this a function
-	gl_fragshader = glCreateShader(GL_FRAGMENT_SHADER);
-	if (!gl_fragshader)
-		err(-1, "Could not create the vertex shader");
-
-	// map the shader file into memory
-	const char *fshader_str = NULL;
-	int fshader_size;
-	map_file(&fshader_str, &fshader_size, GLSL_FRAG_SHADER);
-
-	// get the shader into opengl
-	glShaderSource(gl_fragshader, 1, &fshader_str, NULL);
-	// compile the shader
-	glCompileShader(gl_fragshader);
-	if (debug_shader(gl_fragshader))
-		exit(EXIT_FAILURE);
-
-	// create the main program object, it is an amalgamation of all shaders
-	ren.gl_program = glCreateProgram();
-	// attach the shaders to the program (set which shaders are present)
-	glAttachShader(ren.gl_program, gl_vertshader);
-	glAttachShader(ren.gl_program, gl_fragshader);
-	// then link the program (basically the linking stage of the program)
-	glLinkProgram(ren.gl_program);
-	if (debug_program(ren.gl_program))
-		exit(EXIT_FAILURE);
-
-	// after linking the shaders can be detached and the source freed from
-	// memory since the program is ready to use
-	glDetachShader(ren.gl_program, gl_vertshader);
-	glDetachShader(ren.gl_program, gl_fragshader);
-	munmap((void *)vshader_str, vshader_size);
-	munmap((void *)fshader_str, fshader_size);
-
-	// now tell opengl to use the program
-	glUseProgram(ren.gl_program);
-}
-
-
-void ren_drawvertbuffer()
-{
-	if (!changed())
-		return;
-	glClear(GL_COLOR_BUFFER_BIT);
-	glBindBuffer(GL_ARRAY_BUFFER, ren.gl_vertbuffer);
-	// upload vertex data
-	if (vstack.idx != vstack.prev_idx)
-		glBufferData(GL_ARRAY_BUFFER, vstack.idx*sizeof(struct vertex), vstack.v, GL_DYNAMIC_DRAW);
-	else
-	 	glBufferSubData(GL_ARRAY_BUFFER, 0, vstack.idx*sizeof(struct vertex), vstack.v);
-	// draw vertex data
-	glDrawArrays(GL_TRIANGLES, 0, vstack.idx);
-	glBindBuffer(GL_ARRAY_BUFFER, 0);
-	SDL_GL_SwapWindow(ren.w);
-}
-
-
-int w_height(SDL_Window *win)
-{
-	int h;
-	SDL_GetWindowSize(win, NULL, &h);
-	return h;
-}
-
-
-int w_width(SDL_Window *win)
-{
-	int w;
-	SDL_GetWindowSize(win, &w, NULL);
-	return w;
-}
-
-
-void import_font(const char *path)
-{
-	const char *map;
-	int size;
-	const struct _ff *img;
-
-	map_file(&map, &size, path);
-	img = (const struct _ff *)map;
-	fw = ntohl(img->w);
-	fh = ntohl(img->h);
-
-	glGenTextures(1, &ren.font_texture);
-	glBindTexture(GL_TEXTURE_2D, ren.font_texture);
-	// farbfeld image
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, fw, fh, 0, GL_RGBA, GL_UNSIGNED_SHORT, img->bytes);
-
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-
-	munmap((void *)map, size);
-}
-
-
-void push_text(int x, int y, float scale, const char *s)
-{
-	for (; *s; s++) {
-		int u, v;
-		int idx = *s - ' ';
-		u = idx % (fw / gw);
-		v = (idx / (fw / gw)) % (fh / gh);
-		vstack_push_quad_t(x, y, gw*scale, gh*scale, u*gw, v*gh);
-		x += gw*scale;
-		if (*s == '\n')
-			y += gh;
-	}
-}
-
-
-int main (void)
-{
-	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
-	SDL_SetHint(SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR, "0");
-	SDL_SetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, "1");
-
-	ren.w = SDL_CreateWindow("test",
-	SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
-	500, 500, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE );
-
-	// create the OpenGL context
-	ren.gl = SDL_GL_CreateContext(ren.w);
-	if (ren.gl == NULL)
-		err(-1, "Failed to create OpenGL context: %s", SDL_GetError());
-
-	// select some features
-	glEnable(GL_BLEND);
-	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-	glDisable(GL_CULL_FACE);
-	glDisable(GL_DEPTH_TEST);
-	glEnable(GL_SCISSOR_TEST);
-	glEnable(GL_TEXTURE_2D);
-
-	// initialize glew, this library gives us the declarations for most GL
-	// functions, in the future it would be cool to do it manually
-	GLenum glew_err = glewInit();
-	if (glew_err != GLEW_OK)
-		err(-1, "Failed to initialize GLEW: %s", glewGetErrorString(glew_err));
-
-	ren_initshaders();
-	import_font("./charmap.ff");
-
-	vec4 magenta = {.r=1.0, .g=0.0, .b=1.0, .a=1.0};
-
-	ren_initvertbuffer();
-
-	glClearColor(0.3f, 0.3f, 0.3f, 0.f);
-	glClear(GL_COLOR_BUFFER_BIT);
-
-	// event loop and drawing
-	SDL_Event ev = {0};
-	int running = 1;
-	do {
-		SDL_WaitEvent(&ev);
-		switch (ev.type) {
-		case SDL_QUIT: running = 0; break;
-		case SDL_WINDOWEVENT:
-			if(ev.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
-				glViewport(0, 0, w_width(ren.w), w_height(ren.w));
-				glScissor(0, 0, w_width(ren.w), w_height(ren.w));
-				force_changed();
-			}
-			break;
-		default: break;
-		}
-
-		vstack_push_quad_c(0, 0, 100, 100, magenta);
-		vstack_push_quad_c(200, 0, 10, 10, magenta);
-		vstack_push_quad_c(10, 150, 100, 100, magenta);
-		push_text(250, 250, 1.0f, "Ciao Victoria <3");
-		update_hash();
-
-		ren_drawvertbuffer();
-
-		vstack_clear();
-
-	} while(running);
-
-	glUseProgram(0);
-	glDisableVertexAttribArray(vertindex);
-	glDisableVertexAttribArray(colindex);
-	glDeleteTextures(1, &ren.font_texture);
-	glDeleteBuffers(1, &ren.gl_vertbuffer);
-	SDL_GL_DeleteContext(ren.gl);
-	SDL_DestroyWindow(ren.w);
-	SDL_Quit();
-
-	return 0;
-}

opengl-ren/vertex.glsl

@@ -1,17 +0,0 @@
-#version 330
-
-// use the input ("in") vertices from index zero
-layout(location = 0) in vec2 position;
-layout(location = 1) in vec4 color;
-layout(location = 2) in vec2 uv;
-
-flat out vec4 out_color;
-out vec2 texture_coord;
-
-void main()
-{
-	// simply copy teh output position
-	gl_Position = vec4(position.x, position.y, 0.0f, 1.0f);
-	out_color = color;
-	texture_coord = uv;
-}

opengl/.gitignore

@@ -1,2 +0,0 @@
-a.out
-gl

opengl/Makefile

@@ -1,5 +0,0 @@
-CFLAGS  = -Wall -Wextra -Wpedantic -std=c11 -g
-LDFLAGS = -lSDL2 -lGLEW -lGL
-
-gl: main.c
-	gcc ${CFLAGS} ${LDFLAGS} main.c -o gl

opengl/README

@@ -1,2 +0,0 @@
-since I've never worked with opengl I made this folder as a little test environment
-for an SDL-OpenGL renderer

opengl/fragment.glsl

@@ -1,10 +0,0 @@
-#version 330
-
-smooth in vec4 out_color;
-out vec4 color;
-
-void main()
-{
-	// set the color for each vertex to white
-	color = out_color;
-}

opengl/main.c

@@ -1,278 +0,0 @@
-#define _POSIX_C_SOURCE 200809l
-
-#include <sys/mman.h>
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdint.h>
-#include <unistd.h>
-#include <err.h>
-
-#include <SDL2/SDL.h>
-#include <GL/glew.h>
-#include <SDL2/SDL_opengl.h>
-
-
-#define GLSL_VERT_SHADER "vertex.glsl"
-#define GLSL_FRAG_SHADER "fragment.glsl"
-#define PACKED __attribute__((packed))
-
-
-const int vertindex = 0;
-const int colindex  = 1;
-
-struct {
-	SDL_Window *w;
-	SDL_GLContext *gl;
-	GLuint gl_vertbuffer;
-	GLuint gl_program;
-} ren = {0};
-
-typedef struct PACKED {
-	union { GLfloat x, r; };
-	union { GLfloat y, g; };
-	union { GLfloat z, b; };
-	union { GLfloat w, a; };
-} vec4;
-
-// a vertex has a position and a color
-struct PACKED vertex { vec4 pos, col; };
-
-#define VNUM(s) (sizeof(s)/sizeof(s[0]))
-struct vertex vertbuffer[] = {
-	{ .pos={.x= 0.75f, .y= 0.75f, .z=0.0f,.w=1.0f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
-	{ .pos={.x=-0.75f, .y=-0.75f, .z=0.0f,.w=1.0f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
-	{ .pos={.x= 0.75f, .y=-0.75f, .z=0.0f,.w=1.0f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
-
-	{ .pos={.x= 0.75f, .y= 0.75f, .z=0.0f,.w=1.0f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
-	{ .pos={.x=-0.75f, .y=-0.75f, .z=0.0f,.w=1.0f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
-	{ .pos={.x=-0.75f, .y= 0.75f, .z=0.0f,.w=1.0f}, .col={ .r=1.0f, .g=0.0f, .b=0.0f, .a=1.0f} },
-};
-
-
-// copy the vertex buffer from system to video memory
-void ren_initvertbuffer()
-{
-	// generate a buffer id
-	glGenBuffers(1, &ren.gl_vertbuffer);
-	// tell opengl that we want to work on that buffer
-	glBindBuffer(GL_ARRAY_BUFFER, ren.gl_vertbuffer);
-	// copy the vertex data into the gpu memory, GL_STATIC_DRAW tells opengl
-	// that the data will be used for drawing (DRAW) and it will only be modified
-	// once (STATIC)
-	glBufferData(GL_ARRAY_BUFFER, sizeof(vertbuffer), &vertbuffer, GL_STATIC_DRAW);
-	// set the format of each vertex, in this case each vertex is made of 4
-	// coordinates, x y z w, where w is the clip coordinate, stride is
-	// sizeof(vec4) since every postition vertex there is a vector representing
-	// color data
-	// set the position data of the vertex buffer, and bind it as input to the
-	// vertex shader with an index of 0
-	glEnableVertexAttribArray(vertindex);
-	glVertexAttribPointer(vertindex, 4, GL_FLOAT, GL_FALSE, sizeof(struct vertex), 0);
-	// set the color data of the vertex buffer to index 1
-	// vertex attribute is the OpenGL name given to a set of vertices which are
-	// given as input to a vertext shader, in a shader an array of vertices is
-	// always referred to by index and not by pointer or other manners, indices
-	// go from 0 to 15
-	glEnableVertexAttribArray(colindex);
-	glVertexAttribPointer(colindex, 4, GL_FLOAT, GL_FALSE, sizeof(struct vertex), (void*)sizeof(vec4));
-	// reset the object bind so not to create errors
-	glBindBuffer(GL_ARRAY_BUFFER, 0);
-}
-
-
-void map_file(const char **str, int *size, const char *fname)
-{
-	FILE *fp = fopen(fname, "r");
-	*size = lseek(fileno(fp), 0, SEEK_END);
-	*str = mmap(0, *size, PROT_READ, MAP_PRIVATE, fileno(fp), 0);
-	fclose(fp);
-}
-
-
-// print shader compilation errors
-int debug_shader(GLuint shader)
-{
-	GLint status;
-	glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
-	if (status != GL_FALSE)
-		return 0;
-
-	GLint log_length;
-	glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_length);
-
-	GLchar *log_str = malloc((log_length + 1)*sizeof(GLchar));
-	glGetShaderInfoLog(shader, log_length, NULL, log_str);
-
-	const char *shader_type_str = NULL;
-	GLint shader_type;
-	glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type);
-	switch(shader_type) {
-	case GL_VERTEX_SHADER:   shader_type_str = "vertex";   break;
-	case GL_GEOMETRY_SHADER: shader_type_str = "geometry"; break;
-	case GL_FRAGMENT_SHADER: shader_type_str = "fragment"; break;
-	}
-
-	fprintf(stderr, "Compile failure in %s shader:\n%s\n", shader_type_str, log_str);
-	free(log_str);
-	return -1;
-}
-
-
-// print program compilation errors
-int debug_program(GLuint prog)
-{
-	GLint status;
-	glGetProgramiv (prog, GL_LINK_STATUS, &status);
-	if (status != GL_FALSE)
-		return 0;
-
-	GLint log_length;
-	glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &log_length);
-
-	GLchar *log_str = malloc((log_length + 1)*sizeof(GLchar));
-	glGetProgramInfoLog(prog, log_length, NULL, log_str);
-	fprintf(stderr, "Linker failure: %s\n", log_str);
-	free(log_str);
-
-	return -1;
-}
-
-
-void ren_initshaders()
-{
-	GLuint gl_vertshader, gl_fragshader;
-
-	// initialize the vertex shader and get the corresponding id
-	gl_vertshader = glCreateShader(GL_VERTEX_SHADER);
-	if (!gl_vertshader)
-		err(-1, "Could not create the vertex shader");
-
-	// map the shader file into memory
-	const char *vshader_str = NULL;
-	int vshader_size;
-	map_file(&vshader_str, &vshader_size, GLSL_VERT_SHADER);
-
-	// get the shader into opengl
-	glShaderSource(gl_vertshader, 1, &vshader_str, NULL);
-	// compile the shader
-	glCompileShader(gl_vertshader);
-	if (debug_shader(gl_vertshader))
-		exit(EXIT_FAILURE);
-
-	// do the same for the fragment shader
-	// FIXME: make this a function
-	gl_fragshader = glCreateShader(GL_FRAGMENT_SHADER);
-	if (!gl_fragshader)
-		err(-1, "Could not create the vertex shader");
-
-	// map the shader file into memory
-	const char *fshader_str = NULL;
-	int fshader_size;
-	map_file(&fshader_str, &fshader_size, GLSL_FRAG_SHADER);
-
-	// get the shader into opengl
-	glShaderSource(gl_fragshader, 1, &fshader_str, NULL);
-	// compile the shader
-	glCompileShader(gl_fragshader);
-	if (debug_shader(gl_fragshader))
-		exit(EXIT_FAILURE);
-
-	// create the main program object, it is an amalgamation of all shaders
-	ren.gl_program = glCreateProgram();
-	// attach the shaders to the program (set which shaders are present)
-	glAttachShader(ren.gl_program, gl_vertshader);
-	glAttachShader(ren.gl_program, gl_fragshader);
-	// then link the program (basically the linking stage of the program)
-	glLinkProgram(ren.gl_program);
-	if (debug_program(ren.gl_program))
-		exit(EXIT_FAILURE);
-
-	// after linking the shaders can be detached and the source freed from
-	// memory since the program is ready to use
-	glDetachShader(ren.gl_program, gl_vertshader);
-	glDetachShader(ren.gl_program, gl_fragshader);
-	munmap((void *)vshader_str, vshader_size);
-	munmap((void *)fshader_str, fshader_size);
-
-	// now tell opengl to use the program
-	glUseProgram(ren.gl_program);
-}
-
-
-void ren_drawvertbuffer()
-{
-	glBindBuffer(GL_ARRAY_BUFFER, ren.gl_vertbuffer);
-	glDrawArrays(GL_TRIANGLES, 0, VNUM(vertbuffer));
-	glBindBuffer(GL_ARRAY_BUFFER, 0);
-}
-
-
-int w_height(SDL_Window *win)
-{
-	int h;
-	SDL_GetWindowSize(win, NULL, &h);
-	return h;
-}
-
-
-int w_width(SDL_Window *win)
-{
-	int w;
-	SDL_GetWindowSize(win, &w, NULL);
-	return w;
-}
-
-
-int main (void)
-{
-	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
-	SDL_SetHint(SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR, "0");
-	SDL_SetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, "1");
-
-	ren.w = SDL_CreateWindow("test",
-	SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
-	500, 500, SDL_WINDOW_OPENGL );
-
-	// create the OpenGL context
-	ren.gl = SDL_GL_CreateContext(ren.w);
-	if (ren.gl == NULL)
-		err(-1, "Failed to create OpenGL context: %s", SDL_GetError());
-
-	// initialize glew, this library gives us the declarations for most GL
-	// functions, in the future it would be cool to do it manually
-	GLenum glew_err = glewInit();
-	if (glew_err != GLEW_OK)
-		err(-1, "Failed to initialize GLEW: %s", glewGetErrorString(glew_err));
-
-	ren_initvertbuffer();
-	ren_initshaders();
-
-	// event loop and drawing
-	SDL_Event ev = {0};
-	int running = 1;
-	do {
-		SDL_WaitEvent(&ev);
-		switch (ev.type) {
-		case SDL_QUIT: running = 0; break;
-		default: break;
-		}
-
-		glViewport(0, 0, w_width(ren.w), w_height(ren.w));
-		glClearColor(0.f, 0.f, 0.f, 0.f);
-		glClear(GL_COLOR_BUFFER_BIT);
-
-		ren_drawvertbuffer();
-
-		SDL_GL_SwapWindow(ren.w);
-
-	} while(running);
-
-	glDisableVertexAttribArray(vertindex);
-	glDisableVertexAttribArray(colindex);
-	SDL_GL_DeleteContext(ren.gl);
-	SDL_DestroyWindow(ren.w);
-	SDL_Quit();
-
-	return 0;
-}

opengl/vertex.glsl

@@ -1,14 +0,0 @@
-#version 330
-
-// use the input ("in") vertices from index zero
-layout(location = 0) in vec4 position;
-layout(location = 1) in vec4 color;
-
-smooth out vec4 out_color;
-
-void main()
-{
-	// simply copy teh output position
-	gl_Position = position;
-	out_color = color;
-}

project.json

@@ -0,0 +1,56 @@
+{
+  // Language version of C3.
+  "langrev": "1",
+  // Warnings used for all targets.
+  "warnings": [ "no-unused" ],
+  // Directories where C3 library files may be found.
+  "dependency-search-paths": [ "lib" ],
+  // Libraries to use for all targets.
+  "dependencies": [ "raylib" ],
+  "features": [
+    // See rcore.c3
+    //"SUPPORT_INTERNAL_MEMORY_MANAGEMENT",
+    //"SUPPORT_STANDARD_FILEIO",
+    //"SUPPORT_FILE_SYSTEM_FUNCTIONS",
+    //"SUPPORT_DATA_ENCODER",
+    // See text.c3
+    //"SUPPORT_TEXT_CODEPOINTS_MANAGEMENT",
+    //"SUPPORT_TEXT_C_STRING_MANAGEMENT",
+    //"SUPPORT_RANDOM_GENERATION",
+  
+    "SUPPORT_RAYGUI",
+    //"RAYGUI_NO_ICONS",
+    //"RAYGUI_CUSTOM_ICONS",
+  ],
+  // Authors, optionally with email.
+  "authors": [ "John Doe <john.doe@example.com>" ],
+  // Version using semantic versioning.
+  "version": "0.1.0",
+  // Sources compiled for all targets.
+  "sources": [ "src/**" ],
+  // C sources if the project also compiles C sources
+  // relative to the project file.
+  // "c-sources": [ "csource/**" ],
+  // Include directories for C sources relative to the project file.
+  // "c-include-dirs": [ "csource/include" ],
+  // Output location, relative to project file.
+  "output": "build",
+  // Architecture and OS target.
+  // You can use 'c3c --list-targets' to list all valid targets.
+  // "target": "windows-x64",
+  // Targets.
+  "targets": {
+    "ugui": {
+      // Executable or library.
+      "type": "executable",
+      // Additional libraries, sources
+      // and overrides of global settings here.
+    },
+  },
+  // Global settings.
+  // CPU name, used for optimizations in the LLVM backend.
+  "cpu": "generic",
+  // Optimization: "O0", "O1", "O2", "O3", "O4", "O5", "Os", "Oz".
+  "opt": "O0",
+  // See resources/examples/project_all_settings.json and 'c3c --list-project-properties' to see more properties.
+}

rewrite/generic_stack.h

@@ -1,126 +0,0 @@
-#ifndef _STACK_GENERIC_H
-#define _STACK_GENERIC_H
-
-
-#define STACK_STEP 8
-#define STACK_SALT 0xbabb0cac
-
-// FIXME: find a way to not re-hash the whole stack when removing one item
-
-// incremental hash for every grow
-#define STACK_HASH(p, s, h)                                                    \
-{                                                                              \
-	unsigned char *v = (unsigned char *)(p);                               \
-	for (int x = (s); x; x--) {                                            \
-		(h) += v[x-1];                                                 \
-		(h) += (h) << 10;                                              \
-		(h) ^= (h) >> 6;                                               \
-	}                                                                      \
-	(h) += (h) << 3;                                                       \
-  	(h) ^= (h) >> 11;                                                      \
-  	(h) += (h) << 15;                                                      \
-}
-
-
-// declare just the prototypes
-#define STACK_PROTO(stackname, type)                                           \
-struct stackname {                                                             \
-	type *items;                                                           \
-	int size, idx, old_idx;                                                \
-	unsigned int hash, old_hash;                                           \
-};                                                                             \
-struct stackname stackname##_init(void);                                       \
-int stackname##_grow(struct stackname *stack, int step);                       \
-int stackname##_push(struct stackname *stack, type *e);                        \
-type stackname##_pop(struct stackname *stack);                                 \
-int stackname##_clear(struct stackname *stack);                                \
-int stackname##_changed(struct stackname *stack);                              \
-int stackname##_size_changed(struct stackname *stack);                         \
-int stackname##_free(struct stackname *stack);
-
-
-#define STACK_DEFINE(stackname, type)                                          \
-struct stackname;                                                              \
-\
-\
-struct stackname stackname##_init(void)                                        \
-{                                                                              \
-	return (struct stackname){0, .hash = STACK_SALT};                      \
-}                                                                              \
-\
-\
-int stackname##_grow(struct stackname *stack, int step)                        \
-{                                                                              \
-	if (!stack)                                                            \
-		return -1;                                                     \
-	stack->items = realloc(stack->items, (stack->size+step)*sizeof(type)); \
-	if(!stack->items)                                                      \
-		return -1;                                                     \
-	memset(&(stack->items[stack->size]), 0, step*sizeof(*(stack->items))); \
-	stack->size += step;                                                   \
-	return 0;                                                              \
-}                                                                              \
-\
-\
-int stackname##_push(struct stackname *stack, type *e)                         \
-{                                                                              \
-	if (!stack || !e)                                                      \
-		return -1;                                                     \
-	if (stack->idx >= stack->size)                                         \
-		if (stackname##_grow(stack, STACK_STEP))                       \
-			return -1;                                             \
-	stack->items[stack->idx++] = *e;                                       \
-	STACK_HASH(e, sizeof(type), stack->hash);                              \
-	return 0;                                                              \
-}                                                                              \
-\
-\
-type stackname##_pop(struct stackname *stack)                                  \
-{                                                                              \
-	if (!stack || stack->idx == 0 || stack->size == 0)                     \
-		return (type){0};                                              \
-	stack->hash = STACK_SALT;                                              \
-	STACK_HASH(stack->items, sizeof(type)*(stack->idx-1), stack->hash);    \
-	return stack->items[stack->idx--];                                     \
-}                                                                              \
-\
-\
-int stackname##_clear(struct stackname *stack)                                 \
-{                                                                              \
-	if (!stack)                                                            \
-		return -1;                                                     \
-	stack->old_idx = stack->idx;                                           \
-	stack->old_hash = stack->hash;                                         \
-	stack->hash = STACK_SALT;                                              \
-	stack->idx = 0;                                                        \
-	return 0;                                                              \
-}                                                                              \
-\
-\
-int stackname##_changed(struct stackname *stack)                               \
-{                                                                              \
-	if (!stack)                                                            \
-		return -1;                                                     \
-	return stack->hash != stack->old_hash;                                 \
-}                                                                              \
-\
-\
-int stackname##_size_changed(struct stackname *stack)                          \
-{                                                                              \
-	if (!stack)                                                            \
-		return -1;                                                     \
-	return stack->size != stack->old_idx;                                  \
-}                                                                              \
-\
-\
-int stackname##_free(struct stackname *stack)                                  \
-{                                                                              \
-	if (stack) {                                                           \
-		stackname##_clear(stack);                                      \
-		if (stack->items)                                              \
-			free(stack->items);                                    \
-	}                                                                      \
-	return 0;                                                              \
-}                                                                              \
-
-#endif

src/cache.c3

@@ -0,0 +1,133 @@
+module cache(<Key, Value, SIZE>);
+
+/* LRU Cache
+ * The cache uses a pool (array) to store all the elements, each element has
+ * a key (id) and a value. A HashMap correlates the ids to an index in the pool.
+ * To keep track of which items were recently used two bit arrays are kept, one
+ * stores the "used" flag for each index and anothe the "present" flag.
+ * Every NCYCLES operations the present and used arrays are updated to free up
+ * the elements that were not recently used.
+ */
+
+// FIXME: this module should really allocate all resources on an arena or temp
+//        allocator, since all memory allocations are connected and freeing
+//        happens at the same time
+
+import std::core::mem;
+import std::collections::bitset;
+import std::collections::map;
+
+def BitArr = bitset::BitSet(<SIZE>) @private;
+def IdTable = map::HashMap(<Key, usz>) @private;
+def IdTableEntry = map::Entry(<Key, usz>) @private;
+
+const usz CACHE_NCYCLES = (usz)(SIZE * 2.0/3.0);
+
+struct Cache {
+    BitArr present, used;
+    IdTable table;
+    Value[] pool;
+    usz cycle_count;
+}
+
+// Every CACHE_CYCLES operations mark as not-present the unused elements
+macro Cache.cycle(&cache) @private {
+    cache.cycle_count++;
+	if (cache.cycle_count > CACHE_NCYCLES) {
+		for (usz i = 0; i < cache.present.data.len; i++) {
+			cache.present.data[i] &= cache.used.data[i];
+			cache.used.data[i] = 0;
+		}
+		cache.cycle_count = 0;
+	}
+}
+
+fn void! Cache.init(&cache)
+{
+    cache.table.new_init(capacity: SIZE);
+    // FIXME: this shit is SLOW
+    foreach (idx, bit : cache.used) { cache.used[idx] = false; }
+    foreach (idx, bit : cache.present) { cache.present[idx] = false; }
+    cache.pool = mem::new_array(Value, SIZE);
+}
+
+fn void Cache.free(&cache)
+{
+    (void)cache.table.free();
+    (void)mem::free(cache.pool);
+}
+
+fn Value*! Cache.search(&cache, Key id)
+{
+    // get_entry() faults on miss
+	IdTableEntry* entry = cache.table.get_entry(id)!;
+
+	/* MISS */
+	if (entry.key != id) {
+	   return SearchResult.MISSING?;
+	}
+
+	/* MISS, the data is not valid (not present) */
+	if (!cache.present[entry.value]) {
+	    // if the data is not present but it is still in the table, remove it
+		cache.table.remove(id)!;
+		return SearchResult.MISSING?;
+	}
+
+	/* HIT, set as recently used */
+	cache.used[entry.value] = true;
+	return &(cache.pool[entry.value]);
+}
+
+/* Look for a free spot in the present bitmap and return its index */
+/* If there is no free space left then just return the first position */
+fn usz Cache.get_free_spot(&cache) @private
+{
+    const BITS = $typeof(cache.present.data[0]).sizeof*8;
+    foreach (idx, d: cache.present.data) {
+		if (d.clz() != BITS) {
+			return idx*BITS + BITS-d.clz();
+		}
+	}
+	return 0;
+}
+
+fn Value*! Cache.insert_at(&cache, Value *g, Key id, usz index) @private
+{
+    // TODO: verify index, g and id
+	Value* spot;
+
+	/* Set used and present */
+	cache.present.set(index);
+	cache.used.set(index);
+	cache.cycle();
+
+	spot = &(cache.pool[index]);
+	*spot = *g;
+	cache.table.set(id, index);
+	return spot;
+}
+
+// Insert an element in the cache, returns the index
+fn Value*! Cache.insert_new(&cache, Value* g, Key id)
+{
+	usz index = cache.get_free_spot();
+	return cache.insert_at(g, id, index);
+}
+
+fn Value*! Cache.get_or_insert(&cache, Value* g, Key id, bool *is_new = null)
+{
+    Value*! c = cache.search(id);
+    if (catch e = c) {
+        if (e != SearchResult.MISSING) {
+            return e?;
+        } else {
+        	// if the element is new (inserted) set the is_new flag
+         	if (is_new) *is_new = true;
+        	return cache.insert_new(g, id);
+        }
+    } else {
+    	if (is_new) *is_new = false;
+        return c;
+    }
+}

src/fifo.c3

@@ -0,0 +1,49 @@
+module fifo(<Type>);
+
+import std::core::mem;
+
+fault FifoErr {
+	FULL,
+	EMPTY,
+}
+
+// TODO: specify the allocator
+
+struct Fifo {
+	Type[] arr;
+	usz out;
+	usz count;
+}
+
+fn void! Fifo.init(&fifo, usz size)
+{
+	fifo.arr = mem::new_array(Type, size);
+	fifo.out = 0;
+	fifo.count = 0;
+}
+
+fn void Fifo.free(&fifo)
+{
+	(void)mem::free(fifo.arr);
+}
+
+fn void! Fifo.enqueue(&fifo, Type *elem)
+{
+	if (fifo.count >= fifo.arr.len) {
+		return FifoErr.FULL?;
+	}
+	usz in = (fifo.out + fifo.count) % fifo.arr.len;
+	fifo.arr[in] = *elem;
+	fifo.count++;
+}
+
+fn Type*! Fifo.dequeue(&fifo)
+{
+	if (fifo.count == 0) {
+		return FifoErr.EMPTY?;
+	}
+	Type *ret = &fifo.arr[fifo.out];
+	fifo.count--;
+	fifo.out = (fifo.out + 1) % fifo.arr.len;
+	return ret;
+}

src/main.c3

@@ -0,0 +1,166 @@
+import std::io;
+import vtree;
+import cache;
+import ugui;
+import rl;
+
+fn int main(String[] args)
+{
+	ugui::Ctx ui;
+	ui.init()!!;
+
+	short width = 800;
+	short height = 450;
+	rl::set_config_flags(rl::FLAG_WINDOW_RESIZABLE);
+	rl::init_window(width, height, "Ugui Test");
+	ui.input_window_size(width, height)!!;
+	rl::set_target_fps(60);
+	rl::enable_event_waiting();
+
+	isz frame;
+
+	// Main loop
+	while (!rl::window_should_close()) {
+		const int PARTIAL_INPUT  = 0;
+		const int PARTIAL_LAYOUT = 1;
+		const int PARTIAL_DRAW   = 2;
+
+		/* Start Input Handling */
+		if (rl::is_window_resized()) {
+			width  = (short)rl::get_screen_width();
+			height = (short)rl::get_screen_height();
+			ui.input_window_size(width, height)!!;
+		}
+
+		ui.input_changefocus(rl::is_window_focused());
+
+		rl::Vector2 mpos = rl::get_mouse_position();
+		ui.input_mouse_abs((short)mpos.x, (short)mpos.y);
+
+		ugui::MouseButtons buttons;
+		buttons.btn_left = rl::is_mouse_button_down(rl::MOUSE_BUTTON_LEFT);
+		buttons.btn_right = rl::is_mouse_button_down(rl::MOUSE_BUTTON_RIGHT);
+		buttons.btn_middle = rl::is_mouse_button_down(rl::MOUSE_BUTTON_MIDDLE);
+		ui.input_mouse_button(buttons);
+		/* End Input Handling */
+
+		/* Start UI Handling */
+		ui.frame_begin()!!;
+
+/*
+		// main div, fill the whole window
+		ui.div_begin("main", ugui::Rect{.w=ui.width/2})!!;
+		{|
+			ui.layout_set_row()!!;
+			if (ui.button("button0", ugui::Rect{0,0,30,30})!!.mouse_press) {
+				io::printn("press button0");
+			}
+			//ui.layout_next_column()!!;
+			if (ui.button("button1", ugui::Rect{0,0,30,30})!!.mouse_press) {
+				io::printn("press button1");
+			}
+			//ui.layout_next_column()!!;
+			if (ui.button("button2", ugui::Rect{0,0,30,30})!!.mouse_release) {
+				io::printn("release button2");
+			}
+			if (ui.slider_ver("slider", ugui::Rect{0,0,30,100})!!.update) {
+				ugui::Elem* e = ui.get_elem_by_label("slider")!!;
+				io::printfn("slider: %f", e.slider.value);
+			}
+		|};
+		ui.div_end()!!;
+*/
+		ui.div_begin("second", ugui::DIV_FILL)!!;
+		ugui::Elem* de = ui.get_elem_by_label("second")!!;
+		de.div.scroll.can_y = true;
+		{|
+			ui.layout_set_column()!!;
+			if (ui.slider_ver("slider_other", ugui::Rect{0,0,30,100})!!.update) {
+				ugui::Elem* e = ui.get_elem_by_label("slider_other")!!;
+				io::printfn("other slider: %f", e.slider.value);
+			}
+			ui.button("button10", ugui::Rect{0,0,50,50})!!;
+			ui.button("button11", ugui::Rect{0,0,50,50})!!;
+			ui.button("button12", ugui::Rect{0,0,50,50})!!;
+			ui.button("button13", ugui::Rect{0,0,50,50})!!;
+			ui.button("button14", ugui::Rect{0,0,50,50})!!;
+			ui.button("button15", ugui::Rect{0,0,50,50})!!;
+			ui.button("button16", ugui::Rect{0,0,50,50})!!;
+			ui.button("button17", ugui::Rect{0,0,50,50})!!;
+		|};
+		ui.div_end()!!;
+
+		ui.frame_end()!!;
+		/* End UI Handling */
+
+		/* Start UI Drawing */
+		rl::begin_drawing();
+		// ClearBackground(BLACK);
+
+		rl::Color c;
+		for (Cmd* cmd; (cmd = ui.cmd_queue.dequeue() ?? null) != null;) {
+			switch (cmd.type) {
+			case ugui::CmdType.CMD_RECT:
+				c = rl::Color{
+				    .r = cmd.rect.color.r,
+				    .g = cmd.rect.color.g,
+				    .b = cmd.rect.color.b,
+				    .a = cmd.rect.color.a,
+				};
+				rl::draw_rectangle(
+				    cmd.rect.rect.x,
+				    cmd.rect.rect.y,
+				    cmd.rect.rect.w,
+				    cmd.rect.rect.h,
+				    c
+				);
+			default:
+				io::printfn("Unknown cmd type: %d", cmd.type);
+			}
+		}
+
+		rl::end_drawing();
+	}
+
+	rl::close_window();
+
+	ui.free();
+	return 0;
+}
+
+/*
+fn void! test_vtree() @test
+{
+    vtree::VTree(<String>) vt;
+    vt.init(10)!!;
+    defer vt.free();
+
+    assert(vt.size() == 10, "Size is incorrect");
+
+    isz ref = vt.add("Ciao Mamma", 0)!!;
+    String s = vt.get(ref)!!;
+    assert(s == "Ciao Mamma", "String is incorrect");
+    isz par = vt.parentof(0)!!;
+    assert(ref == par, "Not Root");
+
+    vt.print();
+}
+
+def StrCache = cache::Cache(<int, String, 256>);
+fn void! test_cache() @test
+{
+	StrCache cc;
+	cc.init()!!;
+	defer cc.free();
+
+	String*! r = cc.search(1);
+	if (catch ex = r) {
+		if (ex != SearchResult.MISSING) {
+			return ex?;
+		}
+	}
+
+	r = cc.get_or_insert(&&"Ciao Mamma", 1)!;
+	assert(*r!! == "Ciao Mamma", "incorrect string");
+}
+*/

src/ugui_button.c3

@@ -0,0 +1,47 @@
+module ugui;
+
+import std::io;
+
+// draw a button, return the events on that button
+fn ElemEvents! Ctx.button(&ctx, String label, Rect size)
+{
+	Id id = label.hash();
+
+	Elem *parent = ctx.get_parent()!;
+	Elem *c_elem = ctx.get_elem(id)!;
+	// add it to the tree
+	ctx.tree.add(id, ctx.active_div)!;
+
+	// 1. Fill the element fields
+	// this resets the flags
+	c_elem.type     = ETYPE_BUTTON;
+	Color bg_color = uint_to_rgba(0x0000ffff);
+
+	// if the element is new or the parent was updated then redo layout
+	if (c_elem.flags.is_new || parent.flags.updated) {
+		// 2. Layout
+		c_elem.bounds = ctx.position_element(parent, size, true);
+
+		// TODO: 3. Fill the button specific fields
+	}
+
+	c_elem.events = ctx.get_elem_events(c_elem);
+	if (parent.flags.has_focus) {
+		if (c_elem.events.mouse_hover) {
+			c_elem.flags.has_focus = true;
+			bg_color = uint_to_rgba(0x00ff00ff);
+		}
+	}
+
+	// Draw the button
+	Cmd cmd = {
+	    .type = CMD_RECT,
+	    .rect =	{
+		    .rect  = c_elem.bounds,
+		    .color = bg_color,
+		},
+	};
+	ctx.cmd_queue.enqueue(&cmd)!;
+
+	return c_elem.events;
+}

src/ugui_data.c3

@@ -0,0 +1,213 @@
+module ugui;
+
+import std::io;
+import std::core::string;
+
+import vtree;
+import cache;
+import fifo;
+
+
+struct Rect {
+	short x, y, w, h;
+}
+
+struct Point {
+	short x, y;
+}
+
+struct Color{
+	char r, g, b, a;
+}
+
+// element ids are just long ints
+def Id = usz;
+
+enum ElemType {
+	ETYPE_NONE,
+	ETYPE_DIV,
+	ETYPE_BUTTON,
+	ETYPE_SLIDER,
+}
+
+bitstruct ElemFlags : uint {
+	bool updated : 0;
+	bool has_focus : 1;
+	bool is_new : 2;
+}
+
+bitstruct ElemEvents : uint {
+	bool key_press     : 0;
+	bool key_release   : 1;
+	bool key_hold      : 2;
+	bool mouse_hover   : 3;
+	bool mouse_press   : 4;
+	bool mouse_release : 5;
+	bool mouse_hold    : 6;
+	bool update        : 7;
+}
+
+enum DivLayout {
+	LAYOUT_ROW,
+	LAYOUT_COLUMN,
+	LAYOUT_FLOATING,
+}
+
+// div element
+struct Div {
+	DivLayout layout;
+	struct scroll {
+		bool can_x;
+		bool can_y;
+		bool on_x;
+		bool on_y;
+		float value_x;
+		float value_y;
+	}
+	Rect children_bounds;
+	Point origin_r, origin_c;
+	Color color_bg;
+}
+
+// slider element
+struct Slider {
+    float value;
+    Rect handle;
+}
+
+// element structure
+struct Elem {
+	Id id;
+	ElemFlags flags;
+	ElemEvents events;
+	Rect bounds;
+	ElemType type;
+	union {
+		Div div;
+		Slider slider;
+	}
+}
+
+
+// relationships between elements are stored in a tree, it stores just the ids
+def IdTree = vtree::VTree(<Id>) @private;
+
+// elements themselves are kept in a cache
+const uint MAX_ELEMENTS = 1024;
+def ElemCache = cache::Cache(<Id, Elem, MAX_ELEMENTS>) @private;
+
+def CmdQueue = fifo::Fifo(<Cmd>);
+
+fault UgError {
+	INVALID_SIZE,
+	EVENT_UNSUPPORTED,
+	UNEXPECTED_ELEMENT,
+}
+
+macro uint_to_rgba(uint u) {
+	return Color{
+		.r = (char)((u >> 24) & 0xff),
+		.g = (char)((u >> 16) & 0xff),
+		.b = (char)((u >> 8) & 0xff),
+		.a = (char)((u >> 0) & 0xff)
+	};
+}
+
+const Rect DIV_FILL = { .x = 0, .y = 0, .w = 0, .h = 0 };
+
+macro abs(a) { return a < 0 ? -a : a; }
+macro clamp(x, min, max) { return x < min ? min : (x > max ? max : x); }
+
+const uint STACK_STEP = 10;
+const uint MAX_ELEMS  = 128;
+const uint MAX_CMDS   = 256;
+const uint ROOT_ID    = 1;
+
+// command type
+enum CmdType {
+	CMD_RECT,
+}
+
+// command to draw a rect
+struct CmdRect {
+	Rect rect;
+	Color color;
+}
+
+// command structure
+struct Cmd {
+	CmdType type;
+	union {
+		CmdRect rect;
+	}
+}
+
+enum Layout {
+	ROW,
+	COLUMN,
+	FLOATING
+}
+
+// global style, similar to the css box model
+struct Style { // css box model
+	Rect  padding;
+	Rect  border;
+	Rect  margin;
+	Color bgcolor; // background color
+	Color fgcolor; // foreground color
+	Color bcolor;  // border color
+}
+
+
+struct Ctx {
+	Layout layout;
+	IdTree tree;
+	ElemCache cache;
+	CmdQueue cmd_queue;
+	// total size in pixels of the context
+	ushort width, height;
+	Style style;
+
+	bool has_focus;
+	struct input {
+		InputEvents events;
+		struct mouse {
+			Point pos, delta;
+			// mouse_down:      bitmap of mouse buttons that are held
+			// mouse_updated:   bitmap of mouse buttons that have been updated
+			// mouse_released = mouse_updated & ~mouse_down
+			// mouse_pressed  = mouse_updated & mouse_down
+			MouseButtons down;
+			MouseButtons updated;
+		}
+	}
+
+	isz active_div; // tree node indicating the current active div
+}
+
+macro point_in_rect(Point p, Rect r)
+{
+	return (p.x >= r.x && p.x <= r.x + r.w) && (p.y >= r.y && p.y <= r.y + r.h);
+}
+
+// return true if rect a contains b
+macro rect_contains(Rect a, Rect b)
+{
+	return (a.x <= b.x && a.y <= b.y && a.x+a.w >= b.x+b.w && a.y+a.h >= b.y+b.h);
+}
+
+macro rect_intersection(Rect a, Rect b)
+{
+	return Rect{
+		.x = (short)max(a.x, b.x),
+		.y = (short)max(a.y, b.y),
+		.w = (short)min(a.x+a.w, b.x+b.w) - (short)max(a.x, b.x),
+		.h = (short)min(a.y+a.h, b.y+b.h) - (short)max(a.y, b.y),
+	};
+}
+
+// rect intersection not null
+macro rect_collision(Rect a, Rect b)
+{
+	return !(a.x > b.x+b.w || a.x+a.w < b.x || a.y > b.y+b.h || a.y+a.h < b.y);
+}

src/ugui_div.c3

@@ -0,0 +1,131 @@
+module ugui;
+
+import std::io;
+
+fn void! Ctx.div_begin(&ctx, String label, Rect size)
+{
+	Id id = label.hash();
+
+	Elem *parent = ctx.get_parent()!;
+	Elem* c_elem = ctx.get_elem(id)!;
+	isz div_node = ctx.tree.add(id, ctx.active_div)!;
+	ctx.active_div = div_node;
+
+	// 1. Fill the element fields
+	c_elem.type  = ETYPE_DIV;
+
+	// do layout and update flags only if the element was updated
+	if (c_elem.flags.is_new || parent.flags.updated) {
+		// 2. layout the element
+		c_elem.bounds = ctx.position_element(parent, size);
+		if (c_elem.flags.is_new) {
+			c_elem.div.children_bounds = c_elem.bounds;
+		}
+
+		// 3. Mark the element as updated
+		c_elem.flags.updated = true;
+		// 4. Fill the div fields
+		c_elem.div.layout   = parent.div.layout;
+		c_elem.div.origin_c = Point{
+		    .x = c_elem.bounds.x,
+		    .y = c_elem.bounds.y,
+		};
+		c_elem.div.origin_r = c_elem.div.origin_c;
+		c_elem.div.color_bg = uint_to_rgba(0xff0000ff);
+		c_elem.div.scroll.can_x = false;
+		c_elem.div.scroll.can_y = false;
+		c_elem.div.scroll.value_x = 0;
+		c_elem.div.scroll.value_y = 0;
+	}
+
+	// Add the background to the draw stack
+	Cmd cmd = {
+		.type = CMD_RECT,
+		.rect = {
+		    .rect  = c_elem.bounds,
+		    .color = c_elem.div.color_bg,
+		},
+	};
+	ctx.cmd_queue.enqueue(&cmd)!;
+
+	// TODO: check active
+	// TODO: check resizeable
+
+	// check and draw scroll bars
+	if (!rect_contains(c_elem.bounds, c_elem.div.children_bounds)) {
+		Point cbc = {
+			.x = c_elem.div.children_bounds.x + c_elem.div.children_bounds.w,
+			.y = c_elem.div.children_bounds.y + c_elem.div.children_bounds.h,
+		};
+		Point bc = {
+			.x = c_elem.bounds.x + c_elem.bounds.w,
+			.y = c_elem.bounds.y + c_elem.bounds.h,
+		};
+		// vertical overflow, check and draw scroll bar
+		if (cbc.y > bc.y && c_elem.div.scroll.can_y) {
+			// set the scrollbar flag, is used in layout
+			c_elem.div.scroll.on_y = true;
+
+			Rect vslider = {
+				.x = c_elem.bounds.x + c_elem.bounds.w - 10,
+				.y = c_elem.bounds.y,
+				.w = 10,
+				.h = c_elem.bounds.h,
+			};
+
+			float vh = max((float)bc.y / cbc.y, (float)0.15);
+			Rect vhandle = {
+				.x = c_elem.bounds.x + c_elem.bounds.w - 10,
+				.y = (short)(c_elem.bounds.y + (int)(c_elem.bounds.h*(1-vh) * c_elem.div.scroll.value_y)),
+				.w = 10,
+				.h = (short)(c_elem.bounds.h * vh),
+			};
+
+			c_elem.events = ctx.get_elem_events(c_elem);
+			if (parent.flags.has_focus && c_elem.events.mouse_hover && c_elem.events.mouse_hold && point_in_rect(ctx.input.mouse.pos, vhandle)) {
+				short y = (short)clamp(ctx.input.mouse.pos.y - vhandle.h/2, vslider.y, vslider.y + vslider.h - vhandle.h);
+				vhandle.y = y;
+				float v = (float)(vhandle.y-vslider.y) / (float)(vslider.h-vhandle.h);
+				c_elem.div.scroll.value_y = v;
+				c_elem.flags.updated = true;
+				c_elem.div.origin_c = Point{
+					.x = c_elem.bounds.x,
+					.y = c_elem.bounds.y,
+				};
+				c_elem.div.origin_r = c_elem.div.origin_c;
+			}
+
+			Cmd scrl = {
+				.type = CMD_RECT,
+				.rect.rect = vslider,
+				.rect.color = uint_to_rgba(0x999999ff),
+			};
+			ctx.cmd_queue.enqueue(&scrl)!;
+
+			scrl.rect.rect = vhandle;
+			scrl.rect.color = uint_to_rgba(0x9999ffff);
+			ctx.cmd_queue.enqueue(&scrl)!;
+
+		} else {
+			c_elem.div.scroll.on_y = false;
+		}
+	}
+
+	// if the bounds are outside of the view then allocate space for scrollbars
+	DivLayout old_layout = c_elem.div.layout;
+	c_elem.div.layout = LAYOUT_FLOATING;
+	c_elem.div.layout = old_layout;
+
+	if (parent.flags.has_focus) {
+		if (point_in_rect(ctx.input.mouse.pos, c_elem.bounds)) {
+			c_elem.flags.has_focus = true;
+		}
+	}
+
+}
+
+fn void! Ctx.div_end(&ctx)
+{
+	// the active_div returns to the parent of the current one
+	ctx.active_div = ctx.tree.parentof(ctx.active_div)!;
+}

src/ugui_impl.c3

@@ -0,0 +1,139 @@
+module ugui;
+
+import std::io;
+
+// return a pointer to the parent of the current active div
+fn Elem*! Ctx.get_parent(&ctx)
+{
+	// FIXME: if the tree held pointers to the elements then no more
+	//        redundant cache search
+	Id parent_id = ctx.tree.get(ctx.active_div)!;
+	return ctx.cache.search(parent_id);
+}
+
+// get or push an element from the cache, return a pointer to it
+// resets all flags except is_new which is set accordingly
+macro Ctx.get_elem(&ctx, Id id)
+{
+	Elem empty_elem;
+	bool is_new;
+	Elem* c_elem;
+	c_elem = ctx.cache.get_or_insert(&empty_elem, id, &is_new)!;
+	c_elem.flags = (ElemFlags)0;
+	c_elem.flags.is_new = is_new;
+	return c_elem;
+}
+
+// this searches an element in the cache by label, it does not create a new element
+// if it does't find one
+macro Ctx.get_elem_by_label(&ctx, String label)
+{
+    Id id = label.hash();
+    return ctx.cache.search(id);
+}
+
+macro Ctx.get_elem_by_tree_idx(&ctx, isz idx) @private
+{
+    Id id = ctx.tree.get(ctx.active_div)!;
+	return ctx.cache.search(id);
+}
+
+fn void! Ctx.init(&ctx)
+{
+	ctx.tree.init(MAX_ELEMENTS)!;
+	defer catch { (void)ctx.tree.free(); }
+	//ug_fifo_init(&ctx.fifo, MAX_CMDS);
+
+	ctx.cache.init()!;
+	defer catch { (void)ctx.cache.free(); }
+
+	ctx.cmd_queue.init(MAX_ELEMENTS)!;
+	defer catch { (void)ctx.cmd_queue.free(); }
+
+	ctx.layout = Layout.ROW;
+	ctx.active_div = 0;
+
+	// TODO: add style config
+	ctx.style.margin  = Rect{1, 1, 1, 1};
+}
+
+fn void Ctx.free(&ctx)
+{
+	(void)ctx.tree.free();
+	(void)ctx.cache.free();
+	(void)ctx.cmd_queue.free();
+}
+
+fn void! Ctx.frame_begin(&ctx)
+{
+
+	// 2. Get the root element from the cache and update it
+	Elem* c_elem = ctx.get_elem(ROOT_ID)!;
+	// The root should have the updated flag only if the size of the window
+	// was changed between frames, this propagates an element size recalculation
+	// down the element tree
+	c_elem.flags.updated = ctx.input.events.resize;
+	// if the window has focus then the root element also has focus, no other
+	// computation needed, child elements need to check the mouse positon and
+	// other stuff
+	c_elem.flags.has_focus = ctx.has_focus;
+
+	if (c_elem.flags.is_new || c_elem.flags.updated) {
+	Elem def_root = {
+		.id = ROOT_ID,
+		.type = ETYPE_DIV,
+		.bounds = {
+			.w = ctx.width,
+			.h = ctx.height,
+		},
+		.div = {
+			.layout = LAYOUT_ROW,
+			.children_bounds = {
+				.w = ctx.width,
+				.h = ctx.height,
+			}
+		},
+		.flags = c_elem.flags,
+	};
+
+	*c_elem = def_root;
+	}
+
+	// 3. Push the root element into the element tree
+	ctx.active_div = ctx.tree.add(ROOT_ID, 0)!;
+
+	// The root element does not push anything to the stack
+	// TODO: add a background color taken from a theme or config
+}
+
+fn void! Ctx.frame_end(&ctx)
+{
+	// 1. clear the tree
+	ctx.tree.prune(0)!;
+
+	// 2. clear input fields
+	ctx.input.events = (InputEvents)0;
+
+	// draw mouse position
+$if 1:
+	Cmd cmd = {
+	    .type = CMD_RECT,
+	    .rect.rect = {
+		    .x = ctx.input.mouse.pos.x - 2,
+		    .y = ctx.input.mouse.pos.y - 2,
+		    .w = 4,
+		    .h = 4,
+		},
+		.rect.color = uint_to_rgba(0xff00ffff)
+	};
+	ctx.cmd_queue.enqueue(&cmd)!;
+$endif
+}
+
+/**
+ * @ensure elem != null
+**/
+fn bool Ctx.is_hovered(&ctx, Elem *elem)
+{
+	return point_in_rect(ctx.input.mouse.pos, elem.bounds);
+}

src/ugui_input.c3

@@ -0,0 +1,135 @@
+module ugui;
+
+import std::io;
+
+// TODO: this could be a bitstruct
+bitstruct InputEvents : uint {
+	bool resize : 0; // window size was changed
+	bool change_focus : 1; // window focus changed
+	bool mouse_move : 2; // mouse was moved
+	bool mouse_btn : 3; // mouse button pressed or released
+}
+
+// Window size was changed
+fn void! Ctx.input_window_size(&ctx, short width, short height)
+{
+	if (width <= 0 || height <= 0) {
+		return UgError.INVALID_SIZE?;
+	}
+	ctx.width = width;
+	ctx.height = height;
+	ctx.input.events.resize = true;
+}
+
+// Window gained/lost focus
+fn void Ctx.input_changefocus(&ctx, bool has_focus)
+{
+	// FIXME: raylib only has an API to query the focus status so we have to
+	//        update the input flag only if the focus changed
+	if (ctx.has_focus != has_focus) {
+		ctx.input.events.change_focus = true;
+	}
+	ctx.has_focus = has_focus;
+}
+
+bitstruct MouseButtons : uint {
+	bool btn_left : 0;
+	bool btn_middle : 1;
+	bool btn_right : 2;
+	bool btn_4 : 3;
+	bool btn_5 : 4;
+}
+
+macro Ctx.mouse_pressed(&ctx)
+{
+    return ctx.input.mouse.updated & ctx.input.mouse.down;
+}
+
+macro Ctx.mouse_released(&ctx)
+{
+    return ctx.input.mouse.updated & ~ctx.input.mouse.down;
+}
+
+macro Ctx.mouse_down(&ctx)
+{
+    return ctx.input.mouse.down;
+}
+
+const MouseButtons BTN_NONE = (MouseButtons)0u;
+const MouseButtons BTN_ANY = (MouseButtons)(uint.max);
+const MouseButtons BTN_LEFT = {.btn_left = true};
+const MouseButtons BTN_MIDDLE = {.btn_middle = true};
+const MouseButtons BTN_RIGHT = {.btn_right = true};
+const MouseButtons BTN_4 = {.btn_4 = true};
+const MouseButtons BTN_5 = {.btn_5 = true};
+
+// FIXME: hthis compairson could be done with a cast using MouseButtons.inner
+// property but I could not figure out how
+macro Ctx.is_mouse_pressed(&ctx, MouseButtons btn)
+{
+    return (ctx.mouse_pressed() & btn) != BTN_NONE;
+}
+
+macro Ctx.is_mouse_released(&ctx, MouseButtons btn)
+{
+    return (ctx.mouse_released() & btn) != BTN_NONE;
+}
+
+macro Ctx.is_mouse_down(&ctx, MouseButtons btn)
+{
+    return (ctx.mouse_down() & btn) != BTN_NONE;
+}
+
+macro ElemEvents Ctx.get_elem_events(&ctx, Elem *elem)
+{
+    // TODO: add the other events
+    // FIXME: active should be elsewhere
+    bool active = elem.events.mouse_hold || ctx.is_hovered(elem);
+    ElemEvents ev = {
+        .mouse_hover = ctx.is_hovered(elem),
+        .mouse_press = active & ctx.is_mouse_pressed(BTN_ANY),
+		.mouse_release = active & ctx.is_mouse_released(BTN_ANY),
+		.mouse_hold = active & ctx.is_mouse_down(BTN_ANY),
+    };
+    return ev;
+}
+
+// Mouse Button moved
+fn void Ctx.input_mouse_button(&ctx, MouseButtons buttons)
+{
+	ctx.input.mouse.updated = ctx.input.mouse.down ^ buttons;
+	ctx.input.mouse.down = buttons;
+	ctx.input.events.mouse_btn = true;
+}
+
+// Mouse was moved, report absolute position
+fn void Ctx.input_mouse_abs(&ctx, short x, short y)
+{
+	ctx.input.mouse.pos.x = clamp(x, 0u16, ctx.width);
+	ctx.input.mouse.pos.y = clamp(y, 0u16, ctx.height);
+
+	short dx, dy;
+	dx = x - ctx.input.mouse.pos.x;
+	dy = y - ctx.input.mouse.pos.y;
+
+	ctx.input.mouse.delta.x = dx;
+	ctx.input.mouse.delta.y = dy;
+
+	ctx.input.events.mouse_move = true;
+}
+
+// Mouse was moved, report relative motion
+fn void Ctx.input_mouse_delta(&ctx, short dx, short dy)
+{
+	ctx.input.mouse.delta.x = dx;
+	ctx.input.mouse.delta.y = dy;
+
+	short mx, my;
+	mx = ctx.input.mouse.pos.x + dx;
+	my = ctx.input.mouse.pos.y + dy;
+
+	ctx.input.mouse.pos.x = clamp(mx, 0u16, ctx.width);
+	ctx.input.mouse.pos.y = clamp(my, 0u16, ctx.height);
+
+	ctx.input.events.mouse_move = true;
+}

src/ugui_layout.c3

@@ -0,0 +1,177 @@
+module ugui;
+
+
+fn void! Ctx.layout_set_row(&ctx)
+{
+	Id parent_id = ctx.tree.get(ctx.active_div)!;
+	Elem *parent = ctx.cache.search(parent_id)!;
+
+	if (parent.type != ETYPE_DIV) {
+		// what?
+		return UgError.UNEXPECTED_ELEMENT?;
+	}
+
+	parent.div.layout = LAYOUT_ROW;
+}
+
+fn void! Ctx.layout_set_column(&ctx)
+{
+	Id parent_id = ctx.tree.get(ctx.active_div)!;
+	Elem *parent = ctx.cache.search(parent_id)!;
+
+	if (parent.type != ETYPE_DIV) {
+		// what?
+		return UgError.UNEXPECTED_ELEMENT?;
+	}
+
+	parent.div.layout = LAYOUT_COLUMN;
+}
+
+fn void! Ctx.layout_set_floating(&ctx)
+{
+	Id parent_id = ctx.tree.get(ctx.active_div)!;
+	Elem *parent = ctx.cache.search(parent_id)!;
+
+	if (parent.type != ETYPE_DIV) {
+		// what?
+		return UgError.UNEXPECTED_ELEMENT?;
+	}
+
+	parent.div.layout = LAYOUT_FLOATING;
+}
+
+fn void! Ctx.layout_next_row(&ctx)
+{
+	Id parent_id = ctx.tree.get(ctx.active_div)!;
+	Elem *parent = ctx.cache.search(parent_id)!;
+
+	if (parent.type != ETYPE_DIV) {
+		// what?
+		return UgError.UNEXPECTED_ELEMENT?;
+	}
+
+	parent.div.origin_r = Point{
+	    .x = parent.bounds.x,
+	    .y = parent.div.origin_c.y,
+	};
+	parent.div.origin_c = parent.div.origin_r;
+}
+
+fn void! Ctx.layout_next_column(&ctx)
+{
+	Id parent_id = ctx.tree.get(ctx.active_div)!;
+	Elem *parent = ctx.cache.search(parent_id)!;
+
+	if (parent.type != ETYPE_DIV) {
+		// what?
+		return UgError.UNEXPECTED_ELEMENT?;
+	}
+
+	parent.div.origin_c = Point{
+	    .x = parent.div.origin_r.x,
+	    .y = parent.bounds.y,
+	};
+	parent.div.origin_r = parent.div.origin_c;
+}
+
+// position the rectangle inside the parent according to the layout
+// parent: parent div
+// rect: the requested size
+// style: apply style
+<*
+@require ctx != null
+@require parent.type == ETYPE_DIV
+*>
+fn Rect Ctx.position_element(&ctx, Elem *parent, Rect rect, bool style = false)
+{
+	Rect  placement;
+	Point origin;
+	Div* div = &parent.div;
+
+	// 1. Select the right origin
+	switch (div.layout) {
+	case LAYOUT_ROW:
+		origin = div.origin_r;
+	case LAYOUT_COLUMN:
+		origin = div.origin_c;
+	case LAYOUT_FLOATING: // none
+	default:
+		// Error
+	}
+
+	// the bottom-right border of the element box
+	Point pl_corner;
+
+	// 2. Calculate the placement
+	placement.x = (short)max(origin.x + rect.x, 0);
+	placement.y = (short)max(origin.y + rect.y, 0);
+	placement.w = rect.w > 0 ? rect.w : (short)max(parent.bounds.w - (placement.x - parent.bounds.x), 0);
+	placement.h = rect.h > 0 ? rect.h : (short)max(parent.bounds.h - (placement.y - parent.bounds.y), 0);
+
+	pl_corner.x = placement.x + placement.w;
+	pl_corner.y = placement.y + placement.h;
+
+	// 2.1 apply style, css box model
+	if (style) {
+	    Rect margin = ctx.style.margin;
+	    Rect border = ctx.style.border;
+		Rect padding = ctx.style.padding;
+
+		placement.x += margin.x;
+		placement.y += margin.y;
+		if (rect.w != 0) { placement.w += margin.x+margin.w + padding.x+padding.w; }
+		if (rect.h != 0) { placement.h += margin.y+margin.h + padding.y+padding.h; }
+
+		pl_corner.x = placement.x + placement.w + margin.w;
+		pl_corner.y = placement.y + placement.h + margin.h;
+	}
+
+	// 3. Update the origins of the parent
+	div.origin_r = Point{
+	    .x = pl_corner.x,
+	    .y = origin.y,
+	};
+	div.origin_c = Point{
+	    .x = origin.x,
+	    .y = pl_corner.y,
+	};
+
+	// 4. Calculate the "scrolled" view
+	Point off;
+	Rect* cb = &div.children_bounds;
+	if (div.scroll.can_x && div.scroll.on_x) {
+		off.x = (short)(cb.w * div.scroll.value_x);
+	}
+	if (div.scroll.can_y && div.scroll.on_y) {
+		off.y = (short)((float)(cb.h - parent.bounds.h) * div.scroll.value_y);
+	}
+	Rect view = {
+		.x = parent.bounds.x + off.x,
+		.y = parent.bounds.y + off.y,
+		.w = parent.bounds.w,
+		.h = parent.bounds.h,
+	};
+
+	// 5. check if the placement overflows the children ounds, if so update them
+	if (!point_in_rect(pl_corner, *cb)) {
+		if (pl_corner.y > cb.y+cb.h) {
+			cb.h = pl_corner.y - cb.y;
+		}
+		if (pl_corner.x > cb.x+cb.w) {
+			cb.w += pl_corner.x - (cb.x + cb.w);
+		}
+	}
+
+	// 6. check if the placement is inside the view
+	if (rect_collision(placement, view)) {
+		return Rect{
+			.x = placement.x - off.x,
+			.y = placement.y - off.y,
+			.w = placement.w,
+			.h = placement.h,
+		};
+	} else {
+		return Rect{};
+	}
+}
+

src/ugui_slider.c3

@@ -0,0 +1,140 @@
+module ugui;
+
+import std::io;
+
+/*       handle
+ * +----+-----+---------------------+
+ * |    |#####|                     |
+ * +----+-----+---------------------+
+ */
+fn ElemEvents! Ctx.slider_hor(&ctx, String label, Rect size)
+{
+    Id id = label.hash();
+
+	Elem *parent = ctx.get_parent()!;
+	Elem *c_elem = ctx.get_elem(id)!;
+	// add it to the tree
+	ctx.tree.add(id, ctx.active_div)!;
+
+	// 1. Fill the element fields
+	c_elem.type = ETYPE_SLIDER;
+
+	// if the element is new or the parent was updated then redo layout
+	if (c_elem.flags.is_new || parent.flags.updated) {
+		// 2. Layout
+		c_elem.bounds = ctx.position_element(parent, size, true);
+		c_elem.slider.handle = Rect{
+			.x = (short)(c_elem.bounds.x + (int)(c_elem.bounds.w * c_elem.slider.value)),
+			.y = c_elem.bounds.y,
+			.w = (short)(c_elem.bounds.w * 0.25),
+			.h = c_elem.bounds.h,
+		};
+	}
+
+	c_elem.events = ctx.get_elem_events(c_elem);
+	if (parent.flags.has_focus && c_elem.events.mouse_hover) {
+	    if (point_in_rect(ctx.input.mouse.pos, c_elem.slider.handle) && c_elem.events.mouse_hold) {
+			short x = (short)clamp(ctx.input.mouse.pos.x - c_elem.slider.handle.w/2, c_elem.bounds.x, c_elem.bounds.x + c_elem.bounds.w - c_elem.slider.handle.w);
+			float v = (float)(c_elem.slider.handle.x-c_elem.bounds.x) / (float)(c_elem.bounds.w-c_elem.slider.handle.w);
+			c_elem.slider.handle.x = x;
+			c_elem.slider.value = v;
+			c_elem.events.update = true;
+		}
+	}
+
+	// Draw the button
+	Color bg_color = uint_to_rgba(0x0000ffff);
+	Color handle_color = uint_to_rgba(0x0ff000ff);
+
+	Cmd cmd = {
+	    .type = CMD_RECT,
+	    .rect =	{
+		    .rect  = c_elem.bounds,
+		    .color = bg_color,
+		},
+	};
+	ctx.cmd_queue.enqueue(&cmd)!;
+
+	cmd = Cmd{
+	    .type = CMD_RECT,
+	    .rect =	{
+		    .rect  = c_elem.slider.handle,
+		    .color = handle_color,
+		},
+	};
+	ctx.cmd_queue.enqueue(&cmd)!;
+
+	return c_elem.events;
+}
+
+/*
+ * +-+
+ * | |
+ * | |
+ * +-+
+ * |#| handle
+ * |#|
+ * +-+
+ * | |
+ * | |
+ * +-+
+ */
+fn ElemEvents! Ctx.slider_ver(&ctx, String label, Rect size)
+{
+	Id id = label.hash();
+
+	Elem *parent = ctx.get_parent()!;
+	Elem *c_elem = ctx.get_elem(id)!;
+	// add it to the tree
+	ctx.tree.add(id, ctx.active_div)!;
+
+	// 1. Fill the element fields
+	c_elem.type = ETYPE_SLIDER;
+
+	// if the element is new or the parent was updated then redo layout
+	if (c_elem.flags.is_new || parent.flags.updated) {
+		// 2. Layout
+		c_elem.bounds = ctx.position_element(parent, size, true);
+		c_elem.slider.handle = Rect{
+			.x = c_elem.bounds.x,
+			.y = (short)(c_elem.bounds.y + (int)(c_elem.bounds.h * c_elem.slider.value)),
+			.w = c_elem.bounds.w,
+			.h = (short)(c_elem.bounds.h * 0.25),
+		};
+	}
+
+	c_elem.events = ctx.get_elem_events(c_elem);
+	if (parent.flags.has_focus && c_elem.events.mouse_hover) {
+	    if (point_in_rect(ctx.input.mouse.pos, c_elem.slider.handle) && c_elem.events.mouse_hold) {
+			short y = (short)clamp(ctx.input.mouse.pos.y - c_elem.slider.handle.h/2, c_elem.bounds.y, c_elem.bounds.y + c_elem.bounds.h - c_elem.slider.handle.h);
+			float v = (float)(c_elem.slider.handle.y-c_elem.bounds.y) / (float)(c_elem.bounds.h-c_elem.slider.handle.h);
+			c_elem.slider.handle.y = y;
+			c_elem.slider.value = v;
+			c_elem.events.update = true;
+		}
+	}
+
+	// Draw the button
+	Color bg_color = uint_to_rgba(0x0000ffff);
+	Color handle_color = uint_to_rgba(0x0ff000ff);
+
+	Cmd cmd = {
+	    .type = CMD_RECT,
+	    .rect =	{
+		    .rect  = c_elem.bounds,
+		    .color = bg_color,
+		},
+	};
+	ctx.cmd_queue.enqueue(&cmd)!;
+
+	cmd = Cmd{
+	    .type = CMD_RECT,
+	    .rect =	{
+		    .rect  = c_elem.slider.handle,
+		    .color = handle_color,
+		},
+	};
+	ctx.cmd_queue.enqueue(&cmd)!;
+
+	return c_elem.events;
+}

src/vtree.c3

@@ -0,0 +1,333 @@
+module vtree(<ElemType>);
+
+import std::core::mem;
+import std::io;
+
+struct VTree {
+	usz elements;
+	ElemType[] vector; // vector of element ids
+	isz[] refs, ordered_refs;
+}
+
+fault VTreeError {
+    CANNOT_SHRINK,
+    INVALID_REFERENCE,
+    TREE_FULL,
+    REFERENCE_NOT_PRESENT,
+    INVALID_ARGUMENT,
+}
+
+macro VTree.ref_is_valid(&tree, isz ref) { return (ref >= 0 && ref < tree.refs.len); }
+macro VTree.ref_is_present(&tree, isz ref) { return tree.refs[ref] >= 0; }
+macro VTree.size(&tree) { return tree.refs.len; }
+
+// macro to zero an elemen
+macro @zero()
+{
+	$if $assignable(0, ElemType):
+		return 0;
+	$else
+		return ElemType{0};
+	$endif
+}
+
+fn void! VTree.init(&tree, usz size)
+{
+	tree.vector = mem::new_array(ElemType, size);
+	defer catch { (void)mem::free(tree.vector); }
+
+	tree.refs = mem::new_array(isz, size);
+	defer catch { (void)mem::free(tree.refs); }
+
+	tree.ordered_refs = mem::new_array(isz, size);
+	defer catch { (void)mem::free(tree.ordered_refs); }
+
+	// set all refs to -1, meaning invalid (free) element
+	tree.refs[..] = -1;
+
+	tree.elements = 0;
+}
+
+fn void VTree.free(&tree)
+{
+	(void)mem::free(tree.vector);
+	(void)mem::free(tree.refs);
+	(void)mem::free(tree.ordered_refs);
+}
+
+fn void VTree.pack(&tree)
+{
+	// TODO: add a PACKED flag to skip this
+
+	isz free_spot = -1;
+	for (usz i = 0; i < tree.size(); i++) {
+		if (tree.refs[i] == -1) {
+			free_spot = i;
+			continue;
+		}
+
+		// find a item that can be packed
+		if (free_spot >= 0 && tree.refs[i] >= 0) {
+			isz old_ref = i;
+
+			// move the item
+			tree.vector[free_spot] = tree.vector[i];
+			tree.refs[free_spot]   = tree.refs[i];
+
+			tree.vector[i] = @zero();
+			tree.refs[i]   = -1;
+
+			// and move all references
+			for (usz j = 0; j < tree.size(); j++) {
+				if (tree.refs[j] == old_ref) {
+				    tree.refs[j] = free_spot;
+				}
+			}
+
+			// mark the free spot as used
+			free_spot = -1;
+		}
+	}
+}
+
+fn void! VTree.resize(&tree, usz newsize)
+{
+	// return error when shrinking with too many elements
+	if (newsize < tree.elements) {
+		return VTreeError.CANNOT_SHRINK?;
+	}
+
+	// pack the vector when shrinking to avoid data loss
+	if ((int)newsize < tree.size()) {
+		// FIXME: packing destroys all references to elements of vec
+		//        so shrinking may cause dangling pointers
+		return VTreeError.CANNOT_SHRINK?;
+	}
+
+	usz old_size = tree.size();
+
+	tree.vector = ((ElemType*)mem::realloc(tree.vector, newsize*ElemType.sizeof))[:newsize];
+	defer catch { (void)mem::free(tree.vector); }
+
+	tree.refs = ((isz*)mem::realloc(tree.refs, newsize*isz.sizeof))[:newsize];
+	defer catch { (void)mem::free(tree.refs); }
+
+	tree.ordered_refs = ((isz*)mem::realloc(tree.ordered_refs, newsize*isz.sizeof))[:newsize];
+	defer catch { (void)mem::free(tree.ordered_refs); }
+
+	if (newsize > tree.size()) {
+	   tree.vector[old_size..newsize-1] = @zero();
+	   tree.refs[old_size..newsize-1] = -1;
+	}
+}
+
+// add an element to the tree, return it's ref
+fn isz! VTree.add(&tree, ElemType elem, isz parent)
+{
+	// invalid parent
+	if (!tree.ref_is_valid(parent)) {
+		return VTreeError.INVALID_REFERENCE?;
+	}
+
+	// no space left
+	if (tree.elements >= tree.size()) {
+	   return VTreeError.TREE_FULL?;
+	}
+
+	// check if the parent exists
+	// if there are no elements in the tree the first add will set the root
+	if (!tree.ref_is_present(parent) && tree.elements != 0) {
+	   return VTreeError.REFERENCE_NOT_PRESENT?;
+	}
+
+	// get the first free spot
+	isz free_spot = -1;
+	for (usz i = 0; i < tree.size(); i++) {
+		if (tree.refs[i] == -1) {
+			free_spot = i;
+			break;
+		}
+	}
+	if (free_spot < 0) {
+		return VTreeError.TREE_FULL?;
+	}
+
+	// finally add the element
+	tree.vector[free_spot] = elem;
+	tree.refs[free_spot]   = parent;
+	tree.elements++;
+
+	return free_spot;
+}
+
+// prune the tree starting from the ref
+// returns the number of pruned elements
+fn usz! VTree.prune(&tree, isz ref)
+{
+    if (!tree.ref_is_valid(ref)) {
+		return VTreeError.INVALID_REFERENCE?;
+	}
+
+	if (!tree.ref_is_present(ref)) {
+		return 0;
+	}
+
+	tree.vector[ref] = @zero();
+	tree.refs[ref]   = -1;
+	tree.elements--;
+
+	usz count = 1;
+	for (usz i = 0; tree.elements > 0 && i < tree.size(); i++) {
+		if (tree.refs[i] == ref) {
+			count += tree.prune(i)!;
+		}
+	}
+
+	return count;
+}
+
+// find the size of the subtree starting from ref
+fn usz! VTree.subtree_size(&tree, isz ref)
+{
+    if (!tree.ref_is_valid(ref)) {
+		return VTreeError.INVALID_REFERENCE?;
+	}
+
+	if (!tree.ref_is_present(ref)) {
+		return 0;
+	}
+
+	usz count = 1;
+	for (usz i = 0; i < tree.size(); i++) {
+		// only root has the reference to itself
+		if (tree.refs[i] == ref && ref != i) {
+			count += tree.subtree_size(i)!;
+		}
+	}
+
+	return count;
+}
+
+// iterate through the first level children, use a cursor like strtok_r
+fn isz! VTree.children_it(&tree, isz parent, isz *cursor)
+{
+	if (cursor == null) {
+		return VTreeError.INVALID_ARGUMENT?;
+	}
+
+	// if the cursor is out of bounds then we are done for sure
+	if (!tree.ref_is_valid(*cursor)) {
+		return VTreeError.INVALID_REFERENCE?;
+	}
+
+	// same for the parent, if it's invalid it can't have children
+	if (!tree.ref_is_valid(parent) || !tree.ref_is_present(parent)) {
+		return VTreeError.INVALID_REFERENCE?;
+	}
+
+	// find the first child, update the cursor and return the ref
+	for (isz i = *cursor; i < tree.size(); i++) {
+		if (tree.refs[i] == parent) {
+			*cursor = i + 1;
+			return i;
+		}
+	}
+
+	// if no children are found return -1
+	*cursor = -1;
+	return -1;
+}
+
+/* iterates trough every leaf of the subtree in the following manner
+ * node [x], x: visit order
+ *              [0]
+ *             / | \
+ *            / [2] [3]
+ *          [1]      |
+ *         /   \    [6]
+ *       [4]   [5]
+ */
+fn isz! VTree.level_order_it(&tree, isz ref, isz *cursor)
+{
+	if (cursor == null) {
+	   return VTreeError.INVALID_ARGUMENT?;
+	}
+
+	isz[] queue = tree.ordered_refs;
+
+	// TODO: this could also be done when adding or removing elements
+	// first call, create a ref array ordered like we desire
+	if (*cursor == -1) {
+		*cursor = 0;
+		queue[..] = -1;
+
+		// iterate through the queue appending found children
+		isz pos, off;
+		do {
+			// printf ("ref=%d\n", ref);
+			for (isz i = 0; i < tree.size(); i++) {
+				if (tree.refs[i] == ref) {
+					queue[pos++] = i;
+				}
+			}
+
+			for (; ref == queue[off] && off < tree.size(); off++);
+			ref = queue[off];
+
+		} while (tree.ref_is_valid(ref));
+		// This line is why tree.ordered_refs has to be size+1
+		queue[off + 1] = -1;
+	}
+
+	// PRINT_ARR(queue, tree.size());
+	// return -1;
+
+	// on successive calls just iterate through the queue until we find an
+	// invalid ref, if the user set the cursor to -1 it means it has found what
+	// he needed, so free
+	if (*cursor < 0) {
+		return -1;
+	} else if (tree.ref_is_valid(*cursor)) {
+		return queue[(*cursor)++];
+	}
+
+	return -1;
+}
+
+fn isz! VTree.parentof(&tree, isz ref)
+{
+	if (!tree.ref_is_valid(ref)) {
+		return VTreeError.INVALID_REFERENCE?;
+	}
+
+	if (!tree.ref_is_present(ref)) {
+	   return VTreeError.REFERENCE_NOT_PRESENT?;
+	}
+
+	return tree.refs[ref];
+}
+
+fn ElemType! VTree.get(&tree, isz ref)
+{
+    if (!tree.ref_is_valid(ref)) {
+		return VTreeError.INVALID_REFERENCE?;
+	}
+
+	if (!tree.ref_is_present(ref)) {
+	   return VTreeError.REFERENCE_NOT_PRESENT?;
+	}
+
+	return tree.vector[ref];
+}
+
+fn void VTree.print(&tree)
+{
+	for (isz i = 0; i < tree.size(); i++) {
+		if (tree.refs[i] == -1) {
+			continue;
+		}
+		io::printf("[%d] {parent=%d, data=", i, tree.refs[i]);
+		io::print(tree.vector[i]);
+		io::printn("}");
+	}
+}

test/Makefile

@@ -1,11 +0,0 @@
-CFLAGS  = -Wall -Wextra -Wpedantic -std=c11 -g
-LDFLAGS = -lSDL2 -lm
-
-test: main.c ../ugui.c ../ugui.h ../def_style.h ../input.c
-	gcc ${CFLAGS} -c ../ugui.c -o ugui.o
-	gcc ${CFLAGS} -c ../input.c -o input.o
-	gcc ${CFLAGS} -c main.c    -o main.o
-	gcc ${LDFLAGS} main.o ugui.o input.o -o test
-
-clean:
-	rm -f main.o ugui.o

test/main.c

@@ -1,268 +0,0 @@
-#define _POSIX_C_SOURCE 200809l
-
-#include <stdio.h>
-#include <SDL2/SDL.h>
-
-#include "../ugui.h"
-
-#define STB_RECT_PACK_IMPLEMENTATION
-#define STB_TRUETYPE_IMPLEMENTATION
-#define STBTTF_IMPLEMENTATION
-#include "stbttf.h"
-
-
-SDL_Window *w;
-SDL_Renderer *r;
-ug_ctx_t *ctx;
-STBTTF_Font *font;
-
-void cleanup(void);
-
-int main(void)
-{
-	SDL_DisplayMode dm;
-
-	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
-	SDL_EnableScreenSaver();
-	SDL_EventState(SDL_DROPFILE, SDL_ENABLE);
-	SDL_EventState(SDL_DROPTEXT, SDL_ENABLE);
-
-	SDL_GetDesktopDisplayMode(0, &dm);
-
-#ifdef SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR /* Available since 2.0.8 */
-	SDL_SetHint(SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR, "0");
-#endif
-
-#if SDL_VERSION_ATLEAST(2, 0, 5)
-	SDL_SetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, "1");
-#endif
-
-	w = SDL_CreateWindow("test",
-	                     SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
-	                     dm.w*0.8, dm.h*0.8,
-			     SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI |
-	                     SDL_WINDOW_OPENGL );
-
-	//SDL_Surface *s;
-	//s = SDL_GetWindowSurface(w);
-	r = SDL_CreateRenderer(w, -1, SDL_RENDERER_ACCELERATED);
-	SDL_SetRenderDrawBlendMode(r, SDL_BLENDMODE_BLEND);
-
-	ug_vec2_t size, dsize;
-	SDL_GetWindowSize(w, &size.w, &size.h);
-	SDL_GL_GetDrawableSize(w, &dsize.w, &dsize.h);
-	float scale = 1.0;
-	scale = ((float)(size.w+size.h)/2)/((float)(dsize.w+dsize.h)/2);
-
-	float dpi;
-	int idx;
-	idx = SDL_GetWindowDisplayIndex(w);
-	SDL_GetDisplayDPI(idx, &dpi, NULL, NULL);
-
-
-	ctx = ug_ctx_new();
-	ug_ctx_set_displayinfo(ctx, scale, dpi);
-	ug_ctx_set_drawableregion(ctx, dsize);
-
-	// open font
-	font = STBTTF_OpenFont(r, "monospace.ttf", ctx->style_px->title.font_size.size.i);
-
-//	atexit(cleanup);
-
-	SDL_Event event;
-
-	char button_map[] = {
-		[SDL_BUTTON_LEFT   & 0xff] = UG_BTN_LEFT,
-		[SDL_BUTTON_MIDDLE & 0xff] = UG_BTN_MIDDLE,
-		[SDL_BUTTON_RIGHT  & 0xff] = UG_BTN_RIGHT,
-		[SDL_BUTTON_X1     & 0xff] = UG_BTN_4,
-		[SDL_BUTTON_X2     & 0xff] = UG_BTN_5,
-	};
-
-	do {
-	SDL_WaitEvent(&event);
-
-		switch (event.type) {
-		case SDL_WINDOWEVENT:
-	        	switch (event.window.event) {
-			case SDL_WINDOWEVENT_SHOWN:
-				(SDL_Log("Window %d shown", event.window.windowID));
-				break;
-			case SDL_WINDOWEVENT_HIDDEN:
-				(SDL_Log("Window %d hidden", event.window.windowID));
-				break;
-			case SDL_WINDOWEVENT_EXPOSED:
-				(SDL_Log("Window %d exposed", event.window.windowID));
-				break;
-			case SDL_WINDOWEVENT_MOVED:
-				(SDL_Log("Window %d moved to %d,%d",
-				event.window.windowID, event.window.data1,
-				event.window.data2));
-				break;
-			case SDL_WINDOWEVENT_RESIZED:
-				(SDL_Log("Window %d resized to %dx%d",
-				event.window.windowID, event.window.data1,
-				event.window.data2));
-				break;
-			case SDL_WINDOWEVENT_SIZE_CHANGED:
-				(SDL_Log("Window %d size changed to %dx%d",
-				event.window.windowID, event.window.data1,
-				event.window.data2));
-
-				size.w = event.window.data1;
-				size.h = event.window.data2;
-				// surface is invalidated every time the window
-				// is resized
-				//s = SDL_GetWindowSurface(w);
-				ug_ctx_set_drawableregion(ctx, size);
-
-				break;
-			case SDL_WINDOWEVENT_MINIMIZED:
-				(SDL_Log("Window %d minimized", event.window.windowID));
-				break;
-			case SDL_WINDOWEVENT_MAXIMIZED:
-				(SDL_Log("Window %d maximized", event.window.windowID));
-				break;
-			case SDL_WINDOWEVENT_RESTORED:
-				(SDL_Log("Window %d restored", event.window.windowID));
-				break;
-			case SDL_WINDOWEVENT_ENTER:
-				(SDL_Log("Mouse entered window %d",
-					event.window.windowID));
-				break;
-			case SDL_WINDOWEVENT_LEAVE:
-				(SDL_Log("Mouse left window %d", event.window.windowID));
-				break;
-			case SDL_WINDOWEVENT_FOCUS_GAINED:
-				(SDL_Log("Window %d gained keyboard focus",
-				event.window.windowID));
-				break;
-			case SDL_WINDOWEVENT_FOCUS_LOST:
-				(SDL_Log("Window %d lost keyboard focus",
-				event.window.windowID));
-				break;
-			case SDL_WINDOWEVENT_CLOSE:
-				(SDL_Log("Window %d closed", event.window.windowID));
-				break;
-#if SDL_VERSION_ATLEAST(2, 0, 5)
-			case SDL_WINDOWEVENT_TAKE_FOCUS:
-				(SDL_Log("Window %d is offered a focus", event.window.windowID));
-				break;
-			case SDL_WINDOWEVENT_HIT_TEST:
-				(SDL_Log("Window %d has a special hit test", event.window.windowID));
-				break;
-#endif
-			default:
-				(SDL_Log("Window %d got unknown event %d",
-				event.window.windowID, event.window.event));
-				break;
-			}
-			break;
-		case SDL_QUIT:
-			(printf("Quitting\n"));
-			break;
-		case SDL_MOUSEMOTION:
-
-			ug_input_mousemove(ctx, event.motion.x, event.motion.y);
-
-			break;
-		case SDL_MOUSEBUTTONDOWN:
-			ug_input_mousemove(ctx, event.button.x, event.button.y);
-			ug_input_mousedown(ctx, button_map[event.button.button & 0xff]);
-
-			break;
-		case SDL_MOUSEBUTTONUP:
-
-			ug_input_mousemove(ctx, event.button.x, event.button.y);
-			ug_input_mouseup(ctx, button_map[event.button.button & 0xff]);
-
-			break;
-		default:
-			(printf("Unknown event: %d\n", event.type));
-			break;
-		}
-
-
-		ug_frame_begin(ctx);
-
-		//if (ctx->frame < 5000) {
-		//	ug_container_menu_bar(ctx, "Menu fichissimo", (ug_size_t)SIZE_PX(24));
-		//} else if (ctx->frame == 5000) {
-		//	ug_container_remove(ctx, "Menu fichissimo");
-		//}
-
-		ug_container_floating(ctx, "stupid name", (ug_div_t){.x=SIZE_PX(0), .y=SIZE_PX(0), .w=SIZE_PX(100), .h=SIZE_MM(75.0)});
-		ug_element_button(ctx, "float", "X", (ug_div_t){SQUARE(SIZE_MM(5))});
-		//ug_container_floating(ctx, "floating windoooooooow", (ug_div_t){.x=SIZE_PX(100), .y=SIZE_PX(0), .w=SIZE_PX(100), .h=SIZE_MM(75.0)});
-
-		//ug_container_sidebar(ctx, "Right Sidebar", (ug_size_t)SIZE_PX(300), UG_SIDE_RIGHT);
-		//ug_container_sidebar(ctx, "Left Sidebar", (ug_size_t)SIZE_PX(200), UG_SIDE_LEFT);
-		//ug_container_sidebar(ctx, "Bottom Sidebar", (ug_size_t)SIZE_MM(10), UG_SIDE_BOTTOM);
-		ug_container_sidebar(ctx, "Top Sidebar", (ug_size_t)SIZE_MM(40), UG_SIDE_TOP);
-
-		// ug_container_popup(ctx, "Annoying popup", (ug_div_t){.x=SIZE_MM(150), .y=SIZE_MM(150), .w=SIZE_PX(100), .h=SIZE_MM(75.0)});
-
-		//ug_container_body(ctx, "Main Body");
-		//if (ug_container_body(ctx, "Other Body"))
-		//	printf("No space!\n");
-
-		ug_layout_row(ctx);
-
-		ug_layout_column(ctx);
-		ug_element_button(ctx, "button 1", "hey", (ug_div_t){SQUARE(SIZE_MM(10))});
-		//ug_element_button(ctx, "button 2", "lol", (ug_div_t){SQUARE(SIZE_MM(10))});
-		//ug_layout_next_row(ctx);
-		//ug_element_button(ctx, "button 3", "L", (ug_div_t){SQUARE(SIZE_MM(10))});
-		//ug_element_button(ctx, "button 4", "69", (ug_div_t){SQUARE(SIZE_MM(10))});
-		ug_layout_next_column(ctx);
-		ug_element_button(ctx, "button 5", "lmao", (ug_div_t){SQUARE(SIZE_MM(10))});
-		//ug_element_textbtn(ctx, "text button 1", "foo", (ug_div_t){.w = 0, .h = SIZE_PX(30)});
-		//ug_element_button(ctx, "button 6", "", (ug_div_t){SQUARE(SIZE_MM(10)),.x=SIZE_PX(-10)});
-
-		ug_container_body(ctx, "fill body");
-
-		ug_frame_end(ctx);
-
-		// fill background
-		// solid purple makes it easy to identify, same color as hl missing texture
-		SDL_SetRenderDrawColor(r, 0xff, 0, 0xdc, 0xff);
-		SDL_RenderClear(r);
-		for (ug_cmd_t *cmd = NULL; (cmd = ug_cmd_next(ctx));) {
-			switch (cmd->type) {
-			case UG_CMD_RECT:
-				{
-				ug_color_t col = cmd->rect.color;
-				SDL_Rect sr = {
-					.x = cmd->rect.x,
-					.y = cmd->rect.y,
-					.w = cmd->rect.w,
-					.h = cmd->rect.h,
-				};
-				SDL_SetRenderDrawColor(r, col.r, col.g, col.b, col.a);
-				SDL_RenderFillRect(r, &sr);
-				}
-				break;
-			case UG_CMD_TEXT:
-			SDL_SetRenderDrawColor(r, cmd->text.color.r, cmd->text.color.g, cmd->text.color.b, cmd->text.color.a);
-				STBTTF_RenderText(r, font, cmd->text.x, cmd->text.y, cmd->text.str);
-				break;
-			default: break;
-			}
-		}
-		SDL_RenderPresent(r);
-
-	} while (event.type != SDL_QUIT);
-
-	cleanup();
-
-	return 0;
-}
-
-void cleanup(void)
-{
-	ug_ctx_free(ctx);
-	STBTTF_CloseFont(font);
-	SDL_DestroyRenderer(r);
-	SDL_DestroyWindow(w);
-	SDL_Quit();
-}

test/stb_rect_pack.h

@@ -1,623 +0,0 @@
-// stb_rect_pack.h - v1.01 - public domain - rectangle packing
-// Sean Barrett 2014
-//
-// Useful for e.g. packing rectangular textures into an atlas.
-// Does not do rotation.
-//
-// Before #including,
-//
-//    #define STB_RECT_PACK_IMPLEMENTATION
-//
-// in the file that you want to have the implementation.
-//
-// Not necessarily the awesomest packing method, but better than
-// the totally naive one in stb_truetype (which is primarily what
-// this is meant to replace).
-//
-// Has only had a few tests run, may have issues.
-//
-// More docs to come.
-//
-// No memory allocations; uses qsort() and assert() from stdlib.
-// Can override those by defining STBRP_SORT and STBRP_ASSERT.
-//
-// This library currently uses the Skyline Bottom-Left algorithm.
-//
-// Please note: better rectangle packers are welcome! Please
-// implement them to the same API, but with a different init
-// function.
-//
-// Credits
-//
-//  Library
-//    Sean Barrett
-//  Minor features
-//    Martins Mozeiko
-//    github:IntellectualKitty
-//
-//  Bugfixes / warning fixes
-//    Jeremy Jaussaud
-//    Fabian Giesen
-//
-// Version history:
-//
-//     1.01  (2021-07-11)  always use large rect mode, expose STBRP__MAXVAL in public section
-//     1.00  (2019-02-25)  avoid small space waste; gracefully fail too-wide rectangles
-//     0.99  (2019-02-07)  warning fixes
-//     0.11  (2017-03-03)  return packing success/fail result
-//     0.10  (2016-10-25)  remove cast-away-const to avoid warnings
-//     0.09  (2016-08-27)  fix compiler warnings
-//     0.08  (2015-09-13)  really fix bug with empty rects (w=0 or h=0)
-//     0.07  (2015-09-13)  fix bug with empty rects (w=0 or h=0)
-//     0.06  (2015-04-15)  added STBRP_SORT to allow replacing qsort
-//     0.05:  added STBRP_ASSERT to allow replacing assert
-//     0.04:  fixed minor bug in STBRP_LARGE_RECTS support
-//     0.01:  initial release
-//
-// LICENSE
-//
-//   See end of file for license information.
-
-//////////////////////////////////////////////////////////////////////////////
-//
-//       INCLUDE SECTION
-//
-
-#ifndef STB_INCLUDE_STB_RECT_PACK_H
-#define STB_INCLUDE_STB_RECT_PACK_H
-
-#define STB_RECT_PACK_VERSION  1
-
-#ifdef STBRP_STATIC
-#define STBRP_DEF static
-#else
-#define STBRP_DEF extern
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef struct stbrp_context stbrp_context;
-typedef struct stbrp_node    stbrp_node;
-typedef struct stbrp_rect    stbrp_rect;
-
-typedef int            stbrp_coord;
-
-#define STBRP__MAXVAL  0x7fffffff
-// Mostly for internal use, but this is the maximum supported coordinate value.
-
-STBRP_DEF int stbrp_pack_rects (stbrp_context *context, stbrp_rect *rects, int num_rects);
-// Assign packed locations to rectangles. The rectangles are of type
-// 'stbrp_rect' defined below, stored in the array 'rects', and there
-// are 'num_rects' many of them.
-//
-// Rectangles which are successfully packed have the 'was_packed' flag
-// set to a non-zero value and 'x' and 'y' store the minimum location
-// on each axis (i.e. bottom-left in cartesian coordinates, top-left
-// if you imagine y increasing downwards). Rectangles which do not fit
-// have the 'was_packed' flag set to 0.
-//
-// You should not try to access the 'rects' array from another thread
-// while this function is running, as the function temporarily reorders
-// the array while it executes.
-//
-// To pack into another rectangle, you need to call stbrp_init_target
-// again. To continue packing into the same rectangle, you can call
-// this function again. Calling this multiple times with multiple rect
-// arrays will probably produce worse packing results than calling it
-// a single time with the full rectangle array, but the option is
-// available.
-//
-// The function returns 1 if all of the rectangles were successfully
-// packed and 0 otherwise.
-
-struct stbrp_rect
-{
-   // reserved for your use:
-   int            id;
-
-   // input:
-   stbrp_coord    w, h;
-
-   // output:
-   stbrp_coord    x, y;
-   int            was_packed;  // non-zero if valid packing
-
-}; // 16 bytes, nominally
-
-
-STBRP_DEF void stbrp_init_target (stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes);
-// Initialize a rectangle packer to:
-//    pack a rectangle that is 'width' by 'height' in dimensions
-//    using temporary storage provided by the array 'nodes', which is 'num_nodes' long
-//
-// You must call this function every time you start packing into a new target.
-//
-// There is no "shutdown" function. The 'nodes' memory must stay valid for
-// the following stbrp_pack_rects() call (or calls), but can be freed after
-// the call (or calls) finish.
-//
-// Note: to guarantee best results, either:
-//       1. make sure 'num_nodes' >= 'width'
-//   or  2. call stbrp_allow_out_of_mem() defined below with 'allow_out_of_mem = 1'
-//
-// If you don't do either of the above things, widths will be quantized to multiples
-// of small integers to guarantee the algorithm doesn't run out of temporary storage.
-//
-// If you do #2, then the non-quantized algorithm will be used, but the algorithm
-// may run out of temporary storage and be unable to pack some rectangles.
-
-STBRP_DEF void stbrp_setup_allow_out_of_mem (stbrp_context *context, int allow_out_of_mem);
-// Optionally call this function after init but before doing any packing to
-// change the handling of the out-of-temp-memory scenario, described above.
-// If you call init again, this will be reset to the default (false).
-
-
-STBRP_DEF void stbrp_setup_heuristic (stbrp_context *context, int heuristic);
-// Optionally select which packing heuristic the library should use. Different
-// heuristics will produce better/worse results for different data sets.
-// If you call init again, this will be reset to the default.
-
-enum
-{
-   STBRP_HEURISTIC_Skyline_default=0,
-   STBRP_HEURISTIC_Skyline_BL_sortHeight = STBRP_HEURISTIC_Skyline_default,
-   STBRP_HEURISTIC_Skyline_BF_sortHeight
-};
-
-
-//////////////////////////////////////////////////////////////////////////////
-//
-// the details of the following structures don't matter to you, but they must
-// be visible so you can handle the memory allocations for them
-
-struct stbrp_node
-{
-   stbrp_coord  x,y;
-   stbrp_node  *next;
-};
-
-struct stbrp_context
-{
-   int width;
-   int height;
-   int align;
-   int init_mode;
-   int heuristic;
-   int num_nodes;
-   stbrp_node *active_head;
-   stbrp_node *free_head;
-   stbrp_node extra[2]; // we allocate two extra nodes so optimal user-node-count is 'width' not 'width+2'
-};
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
-
-//////////////////////////////////////////////////////////////////////////////
-//
-//     IMPLEMENTATION SECTION
-//
-
-#ifdef STB_RECT_PACK_IMPLEMENTATION
-#ifndef STBRP_SORT
-#include <stdlib.h>
-#define STBRP_SORT qsort
-#endif
-
-#ifndef STBRP_ASSERT
-#include <assert.h>
-#define STBRP_ASSERT assert
-#endif
-
-#ifdef _MSC_VER
-#define STBRP__NOTUSED(v)  (void)(v)
-#define STBRP__CDECL       __cdecl
-#else
-#define STBRP__NOTUSED(v)  (void)sizeof(v)
-#define STBRP__CDECL
-#endif
-
-enum
-{
-   STBRP__INIT_skyline = 1
-};
-
-STBRP_DEF void stbrp_setup_heuristic(stbrp_context *context, int heuristic)
-{
-   switch (context->init_mode) {
-      case STBRP__INIT_skyline:
-         STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight || heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight);
-         context->heuristic = heuristic;
-         break;
-      default:
-         STBRP_ASSERT(0);
-   }
-}
-
-STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context *context, int allow_out_of_mem)
-{
-   if (allow_out_of_mem)
-      // if it's ok to run out of memory, then don't bother aligning them;
-      // this gives better packing, but may fail due to OOM (even though
-      // the rectangles easily fit). @TODO a smarter approach would be to only
-      // quantize once we've hit OOM, then we could get rid of this parameter.
-      context->align = 1;
-   else {
-      // if it's not ok to run out of memory, then quantize the widths
-      // so that num_nodes is always enough nodes.
-      //
-      // I.e. num_nodes * align >= width
-      //                  align >= width / num_nodes
-      //                  align = ceil(width/num_nodes)
-
-      context->align = (context->width + context->num_nodes-1) / context->num_nodes;
-   }
-}
-
-STBRP_DEF void stbrp_init_target(stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes)
-{
-   int i;
-
-   for (i=0; i < num_nodes-1; ++i)
-      nodes[i].next = &nodes[i+1];
-   nodes[i].next = NULL;
-   context->init_mode = STBRP__INIT_skyline;
-   context->heuristic = STBRP_HEURISTIC_Skyline_default;
-   context->free_head = &nodes[0];
-   context->active_head = &context->extra[0];
-   context->width = width;
-   context->height = height;
-   context->num_nodes = num_nodes;
-   stbrp_setup_allow_out_of_mem(context, 0);
-
-   // node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly)
-   context->extra[0].x = 0;
-   context->extra[0].y = 0;
-   context->extra[0].next = &context->extra[1];
-   context->extra[1].x = (stbrp_coord) width;
-   context->extra[1].y = (1<<30);
-   context->extra[1].next = NULL;
-}
-
-// find minimum y position if it starts at x1
-static int stbrp__skyline_find_min_y(stbrp_context *c, stbrp_node *first, int x0, int width, int *pwaste)
-{
-   stbrp_node *node = first;
-   int x1 = x0 + width;
-   int min_y, visited_width, waste_area;
-
-   STBRP__NOTUSED(c);
-
-   STBRP_ASSERT(first->x <= x0);
-
-   #if 0
-   // skip in case we're past the node
-   while (node->next->x <= x0)
-      ++node;
-   #else
-   STBRP_ASSERT(node->next->x > x0); // we ended up handling this in the caller for efficiency
-   #endif
-
-   STBRP_ASSERT(node->x <= x0);
-
-   min_y = 0;
-   waste_area = 0;
-   visited_width = 0;
-   while (node->x < x1) {
-      if (node->y > min_y) {
-         // raise min_y higher.
-         // we've accounted for all waste up to min_y,
-         // but we'll now add more waste for everything we've visted
-         waste_area += visited_width * (node->y - min_y);
-         min_y = node->y;
-         // the first time through, visited_width might be reduced
-         if (node->x < x0)
-            visited_width += node->next->x - x0;
-         else
-            visited_width += node->next->x - node->x;
-      } else {
-         // add waste area
-         int under_width = node->next->x - node->x;
-         if (under_width + visited_width > width)
-            under_width = width - visited_width;
-         waste_area += under_width * (min_y - node->y);
-         visited_width += under_width;
-      }
-      node = node->next;
-   }
-
-   *pwaste = waste_area;
-   return min_y;
-}
-
-typedef struct
-{
-   int x,y;
-   stbrp_node **prev_link;
-} stbrp__findresult;
-
-static stbrp__findresult stbrp__skyline_find_best_pos(stbrp_context *c, int width, int height)
-{
-   int best_waste = (1<<30), best_x, best_y = (1 << 30);
-   stbrp__findresult fr;
-   stbrp_node **prev, *node, *tail, **best = NULL;
-
-   // align to multiple of c->align
-   width = (width + c->align - 1);
-   width -= width % c->align;
-   STBRP_ASSERT(width % c->align == 0);
-
-   // if it can't possibly fit, bail immediately
-   if (width > c->width || height > c->height) {
-      fr.prev_link = NULL;
-      fr.x = fr.y = 0;
-      return fr;
-   }
-
-   node = c->active_head;
-   prev = &c->active_head;
-   while (node->x + width <= c->width) {
-      int y,waste;
-      y = stbrp__skyline_find_min_y(c, node, node->x, width, &waste);
-      if (c->heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight) { // actually just want to test BL
-         // bottom left
-         if (y < best_y) {
-            best_y = y;
-            best = prev;
-         }
-      } else {
-         // best-fit
-         if (y + height <= c->height) {
-            // can only use it if it first vertically
-            if (y < best_y || (y == best_y && waste < best_waste)) {
-               best_y = y;
-               best_waste = waste;
-               best = prev;
-            }
-         }
-      }
-      prev = &node->next;
-      node = node->next;
-   }
-
-   best_x = (best == NULL) ? 0 : (*best)->x;
-
-   // if doing best-fit (BF), we also have to try aligning right edge to each node position
-   //
-   // e.g, if fitting
-   //
-   //     ____________________
-   //    |____________________|
-   //
-   //            into
-   //
-   //   |                         |
-   //   |             ____________|
-   //   |____________|
-   //
-   // then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned
-   //
-   // This makes BF take about 2x the time
-
-   if (c->heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight) {
-      tail = c->active_head;
-      node = c->active_head;
-      prev = &c->active_head;
-      // find first node that's admissible
-      while (tail->x < width)
-         tail = tail->next;
-      while (tail) {
-         int xpos = tail->x - width;
-         int y,waste;
-         STBRP_ASSERT(xpos >= 0);
-         // find the left position that matches this
-         while (node->next->x <= xpos) {
-            prev = &node->next;
-            node = node->next;
-         }
-         STBRP_ASSERT(node->next->x > xpos && node->x <= xpos);
-         y = stbrp__skyline_find_min_y(c, node, xpos, width, &waste);
-         if (y + height <= c->height) {
-            if (y <= best_y) {
-               if (y < best_y || waste < best_waste || (waste==best_waste && xpos < best_x)) {
-                  best_x = xpos;
-                  STBRP_ASSERT(y <= best_y);
-                  best_y = y;
-                  best_waste = waste;
-                  best = prev;
-               }
-            }
-         }
-         tail = tail->next;
-      }
-   }
-
-   fr.prev_link = best;
-   fr.x = best_x;
-   fr.y = best_y;
-   return fr;
-}
-
-static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, int width, int height)
-{
-   // find best position according to heuristic
-   stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height);
-   stbrp_node *node, *cur;
-
-   // bail if:
-   //    1. it failed
-   //    2. the best node doesn't fit (we don't always check this)
-   //    3. we're out of memory
-   if (res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) {
-      res.prev_link = NULL;
-      return res;
-   }
-
-   // on success, create new node
-   node = context->free_head;
-   node->x = (stbrp_coord) res.x;
-   node->y = (stbrp_coord) (res.y + height);
-
-   context->free_head = node->next;
-
-   // insert the new node into the right starting point, and
-   // let 'cur' point to the remaining nodes needing to be
-   // stiched back in
-
-   cur = *res.prev_link;
-   if (cur->x < res.x) {
-      // preserve the existing one, so start testing with the next one
-      stbrp_node *next = cur->next;
-      cur->next = node;
-      cur = next;
-   } else {
-      *res.prev_link = node;
-   }
-
-   // from here, traverse cur and free the nodes, until we get to one
-   // that shouldn't be freed
-   while (cur->next && cur->next->x <= res.x + width) {
-      stbrp_node *next = cur->next;
-      // move the current node to the free list
-      cur->next = context->free_head;
-      context->free_head = cur;
-      cur = next;
-   }
-
-   // stitch the list back in
-   node->next = cur;
-
-   if (cur->x < res.x + width)
-      cur->x = (stbrp_coord) (res.x + width);
-
-#ifdef _DEBUG
-   cur = context->active_head;
-   while (cur->x < context->width) {
-      STBRP_ASSERT(cur->x < cur->next->x);
-      cur = cur->next;
-   }
-   STBRP_ASSERT(cur->next == NULL);
-
-   {
-      int count=0;
-      cur = context->active_head;
-      while (cur) {
-         cur = cur->next;
-         ++count;
-      }
-      cur = context->free_head;
-      while (cur) {
-         cur = cur->next;
-         ++count;
-      }
-      STBRP_ASSERT(count == context->num_nodes+2);
-   }
-#endif
-
-   return res;
-}
-
-static int STBRP__CDECL rect_height_compare(const void *a, const void *b)
-{
-   const stbrp_rect *p = (const stbrp_rect *) a;
-   const stbrp_rect *q = (const stbrp_rect *) b;
-   if (p->h > q->h)
-      return -1;
-   if (p->h < q->h)
-      return  1;
-   return (p->w > q->w) ? -1 : (p->w < q->w);
-}
-
-static int STBRP__CDECL rect_original_order(const void *a, const void *b)
-{
-   const stbrp_rect *p = (const stbrp_rect *) a;
-   const stbrp_rect *q = (const stbrp_rect *) b;
-   return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
-}
-
-STBRP_DEF int stbrp_pack_rects(stbrp_context *context, stbrp_rect *rects, int num_rects)
-{
-   int i, all_rects_packed = 1;
-
-   // we use the 'was_packed' field internally to allow sorting/unsorting
-   for (i=0; i < num_rects; ++i) {
-      rects[i].was_packed = i;
-   }
-
-   // sort according to heuristic
-   STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_height_compare);
-
-   for (i=0; i < num_rects; ++i) {
-      if (rects[i].w == 0 || rects[i].h == 0) {
-         rects[i].x = rects[i].y = 0;  // empty rect needs no space
-      } else {
-         stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
-         if (fr.prev_link) {
-            rects[i].x = (stbrp_coord) fr.x;
-            rects[i].y = (stbrp_coord) fr.y;
-         } else {
-            rects[i].x = rects[i].y = STBRP__MAXVAL;
-         }
-      }
-   }
-
-   // unsort
-   STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_original_order);
-
-   // set was_packed flags and all_rects_packed status
-   for (i=0; i < num_rects; ++i) {
-      rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
-      if (!rects[i].was_packed)
-         all_rects_packed = 0;
-   }
-
-   // return the all_rects_packed status
-   return all_rects_packed;
-}
-#endif
-
-/*
-------------------------------------------------------------------------------
-This software is available under 2 licenses -- choose whichever you prefer.
-------------------------------------------------------------------------------
-ALTERNATIVE A - MIT License
-Copyright (c) 2017 Sean Barrett
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-of the Software, and to permit persons to whom the Software is furnished to do
-so, subject to the following conditions:
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-------------------------------------------------------------------------------
-ALTERNATIVE B - Public Domain (www.unlicense.org)
-This is free and unencumbered software released into the public domain.
-Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
-software, either in source code form or as a compiled binary, for any purpose,
-commercial or non-commercial, and by any means.
-In jurisdictions that recognize copyright laws, the author or authors of this
-software dedicate any and all copyright interest in the software to the public
-domain. We make this dedication for the benefit of the public at large and to
-the detriment of our heirs and successors. We intend this dedication to be an
-overt act of relinquishment in perpetuity of all present and future rights to
-this software under copyright law.
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-------------------------------------------------------------------------------
-*/

test/stbttf.h

@@ -1,212 +0,0 @@
-#ifndef __STBTTF_H__
-#define __STBTTF_H__
-
-#include <SDL2/SDL.h>
-
-#include "stb_rect_pack.h"
-#include "stb_truetype.h"
-
-/* STBTTF: A quick and dirty SDL2 text renderer based on stb_truetype and stdb_rect_pack.
- * Benoit Favre 2019
- *
- * This header-only addon to the stb_truetype library allows to draw text with SDL2 from
- * TTF fonts with a similar API to SDL_TTF without the bloat.
- * The renderer is however limited by the integral positioning of SDL blit functions.
- * It also does not parse utf8 text and only prints ASCII characters.
- *
- * This code is public domain.
- */
-
-typedef struct {
-	stbtt_fontinfo* info;
-	stbtt_packedchar* chars;
-	SDL_Texture* atlas;
-	int texture_size;
-	float size;
-	float scale;
-	int ascent;
-	int baseline;
-} STBTTF_Font;
-
-/* Release the memory and textures associated with a font */
-void STBTTF_CloseFont(STBTTF_Font* font);
-
-/* Open a TTF font given a SDL abstract IO handler, for a given renderer and a given font size.
- * Returns NULL on failure. The font must be deallocated with STBTTF_CloseFont when not used anymore.
- * This function creates a texture atlas with prerendered ASCII characters (32-128).
- */ 
-STBTTF_Font* STBTTF_OpenFontRW(SDL_Renderer* renderer, SDL_RWops* rw, float size);
-
-/* Open a TTF font given a filename, for a given renderer and a given font size.
- * Convinience function which calls STBTTF_OpenFontRW.
- */
-STBTTF_Font* STBTTF_OpenFont(SDL_Renderer* renderer, const char* filename, float size);
-
-/* Draw some text using the renderer draw color at location (x, y).
- * Characters are copied from the texture atlas using the renderer SDL_RenderCopy function.
- * Since that function only supports integral coordinates, the result is not great.
- * Only ASCII characters (32 <= c < 128) are supported. Anything outside this range is ignored.
- */
-void STBTTF_RenderText(SDL_Renderer* renderer, STBTTF_Font* font, float x, float y, const char *text);
-
-/* Return the length in pixels of a text. 
- * You can get the height of a line by using font->baseline.
- */
-float STBTTF_MeasureText(STBTTF_Font* font, const char *text);
-
-#ifdef STBTTF_IMPLEMENTATION
-
-void STBTTF_CloseFont(STBTTF_Font* font) {
-	if(font->atlas) SDL_DestroyTexture(font->atlas);
-	if(font->info) free(font->info);
-	if(font->chars) free(font->chars);
-	free(font);
-}
-
-STBTTF_Font* STBTTF_OpenFontRW(SDL_Renderer* renderer, SDL_RWops* rw, float size) {
-	Sint64 file_size = SDL_RWsize(rw);
-	unsigned char* buffer = malloc(file_size);
-	if(SDL_RWread(rw, buffer, file_size, 1) != 1) return NULL;
-	SDL_RWclose(rw);
-
-	STBTTF_Font* font = calloc(sizeof(STBTTF_Font), 1);
-	font->info = malloc(sizeof(stbtt_fontinfo));
-	font->chars = malloc(sizeof(stbtt_packedchar) * 96);
-
-	if(stbtt_InitFont(font->info, buffer, 0) == 0) {
-		free(buffer);
-		STBTTF_CloseFont(font);
-		return NULL;
-	}
-
-	// fill bitmap atlas with packed characters
-	unsigned char* bitmap = NULL;
-	font->texture_size = 32;
-	while(1) {
-		bitmap = malloc(font->texture_size * font->texture_size);
-		stbtt_pack_context pack_context;
-		stbtt_PackBegin(&pack_context, bitmap, font->texture_size, font->texture_size, 0, 1, 0);
-		stbtt_PackSetOversampling(&pack_context, 1, 1);
-		if(!stbtt_PackFontRange(&pack_context, buffer, 0, size, 32, 95, font->chars)) {
-			// too small
-			free(bitmap);
-			stbtt_PackEnd(&pack_context);
-			font->texture_size *= 2;
-		} else {
-			stbtt_PackEnd(&pack_context);
-			break;
-		}
-	}
-
-	// convert bitmap to texture
-	font->atlas = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_STATIC, font->texture_size, font->texture_size);
-	SDL_SetTextureBlendMode(font->atlas, SDL_BLENDMODE_BLEND);
-
-	Uint32* pixels = malloc(font->texture_size * font->texture_size * sizeof(Uint32));
-	static SDL_PixelFormat* format = NULL;
-	if(format == NULL) format = SDL_AllocFormat(SDL_PIXELFORMAT_RGBA32);
-	for(int i = 0; i < font->texture_size * font->texture_size; i++) {
-		pixels[i] = SDL_MapRGBA(format, 0xff, 0xff, 0xff, bitmap[i]);
-	}
-	SDL_UpdateTexture(font->atlas, NULL, pixels, font->texture_size * sizeof(Uint32));
-	free(pixels);
-	free(bitmap);
-
-	// setup additional info
-  font->scale = stbtt_ScaleForPixelHeight(font->info, size);
-	stbtt_GetFontVMetrics(font->info, &font->ascent, 0, 0);
-  font->baseline = (int) (font->ascent * font->scale);
-
-	free(buffer);
-
-	return font;
-}
-
-STBTTF_Font* STBTTF_OpenFont(SDL_Renderer* renderer, const char* filename, float size) {
-	SDL_RWops *rw = SDL_RWFromFile(filename, "rb");
-	if(rw == NULL) return NULL;
-	return STBTTF_OpenFontRW(renderer, rw, size);
-}
-
-void STBTTF_RenderText(SDL_Renderer* renderer, STBTTF_Font* font, float x, float y, const char *text) {
-	Uint8 r, g, b, a;
-	SDL_GetRenderDrawColor(renderer, &r, &g, &b, &a);
-	SDL_SetTextureColorMod(font->atlas, r, g, b);
-	SDL_SetTextureAlphaMod(font->atlas, a);
-	for(int i = 0; text[i]; i++) {
-		if (text[i] >= 32 && text[i] < 128) {
-			//if(i > 0) x += stbtt_GetCodepointKernAdvance(font->info, text[i - 1], text[i]) * font->scale;
-
-			stbtt_packedchar* info = &font->chars[text[i] - 32];
-			SDL_Rect src_rect = {info->x0, info->y0, info->x1 - info->x0, info->y1 - info->y0};
-			SDL_Rect dst_rect = {x + info->xoff, y + info->yoff, info->x1 - info->x0, info->y1 - info->y0};
-
-			SDL_RenderCopy(renderer, font->atlas, &src_rect, &dst_rect);
-			x += info->xadvance;
-		}
-	}
-}
-
-float STBTTF_MeasureText(STBTTF_Font* font, const char *text) {
-	float width = 0;
-	for(int i = 0; text[i]; i++) {
-		if (text[i] >= 32 && text[i] < 128) {
-			//if(i > 0) width += stbtt_GetCodepointKernAdvance(font->info, text[i - 1], text[i]) * font->scale;
-
-			stbtt_packedchar* info = &font->chars[text[i] - 32];
-			width += info->xadvance;
-		}
-	}
-	return width;
-}
-
-/*******************
- * Example program *
- *******************
-
-#include <stdio.h>
-
-#define STB_RECT_PACK_IMPLEMENTATION
-#define STB_TRUETYPE_IMPLEMENTATION
-#define STBTTF_IMPLEMENTATION
-
-#include "stbttf.h"
-
-int main(int argc, char** argv) {
-	if(argc != 2) {
-		fprintf(stderr, "usage: %s <font>\n", argv[0]);
-		exit(1);
-	}
-	SDL_Init(SDL_INIT_VIDEO);
-	SDL_Window* window = SDL_CreateWindow("stbttf", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
-	SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
-	SDL_RenderSetLogicalSize(renderer, 640, 480);
-	SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
-
-	STBTTF_Font* font = STBTTF_OpenFont(renderer, argv[1], 32);
-
-	while(1) {
-		SDL_Event event;
-		while(SDL_PollEvent(&event)) {
-			if(event.type == SDL_QUIT) exit(0);
-		}
-		SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
-		SDL_RenderClear(renderer);
-		// set color and render some text
-		SDL_SetRenderDrawColor(renderer, 128, 0, 0, 255);
-		STBTTF_RenderText(renderer, font, 50, 50, "This is a test");
-		// render the atlas to check its content
-		//SDL_Rect dest = {0, 0, font->texturesize, font->texturesize};
-		//SDL_RenderCopy(renderer, font->atlas, &dest, &dest);
-		SDL_RenderPresent(renderer);
-		SDL_Delay(1000 / 60);
-	}
-	STBTTF_CloseFont(font);
-	SDL_Quit();
-}
-
-*/
-
-#endif
-
-#endif

test/test_bitsruct.c3

@@ -0,0 +1,14 @@
+bitstruct Bits : uint {
+	bool a : 0;
+	bool b : 1;
+	bool c : 2;
+}
+
+fn int main()
+{
+	Bits a = {false, true, false};
+	Bits b = {true, true, false};
+	Bits c = a | b;
+
+	return 0;
+}

test/test_bittype.c3

@@ -0,0 +1,10 @@
+import std::io;
+import std::collections::bitset;
+
+def Bits = bitset::BitSet(<128>);
+
+fn void main()
+{
+    Bits b;
+	io::printn($typeof(b.data[0]).sizeof);
+}

test/test_custom_hash.c3

@@ -0,0 +1,14 @@
+import std::collections::map;
+
+def Codepoint = uint;
+fn uint Codepoint.hash(Codepoint code) => code < 128 ? code : ((uint)code).hash();
+def CodeMap = map::HashMap(<Codepoint, Codepoint>);
+
+
+fn int main()
+{
+    CodeMap m;
+    m.new_init();
+    m.free();
+    return 0;
+}

test/test_union.c3

@@ -0,0 +1,26 @@
+
+struct CmdA {
+	int a, b;
+}
+
+struct CmdB {
+	float a, b;
+}
+
+union AnyCmd {
+	CmdA a;
+	CmdB b;
+}
+
+struct Cmd {
+	int type;
+	AnyCmd cmd;
+}
+
+fn int main()
+{
+	Cmd c;
+	c.type = 1;
+	c.cmd.a = {.a = 1, .b = 2};
+	return 0;
+}

test/test_vtree.c3

@@ -0,0 +1,7 @@
+import std::io;
+import vtree;
+
+fn int main()
+{
+    return 0;
+}

test/ugui_font.c3

@@ -1,41 +1,72 @@
-#define _POSIX_C_SOURCE 200809l
-#define STB_TRUETYPE_IMPLEMENTATION
-#define STBTT_STATIC
-#define STB_IMAGE_WRITE_IMPLEMENTATION
+module ugui;
+
+import cache;
+//#include <grapheme.h>
+//#include <assert.h>
+
+//#include "stb_truetype.h"
+//#include "stbimage_write.h"
+
+// unicode code point, different type for a different hash
+def Codepoint = uint;
+
+/* width and height of a glyph contain the kering advance
+ * (u,v)
+ *   +-------------*---+ -
+ *   |       ^     |   | ^
+ *   |       |oy   |   | |
+ *   |       v     |   | |
+ *   |      .ii.   |   | |
+ *   |     @@@@@@. |<->| |
+ *   |    V@Mio@@o |adv| |h
+ *   |    :i.  V@V |   | |
+ *   |      :oM@@M |   | |
+ *   |    :@@@MM@M |   | |
+ *   |    @@o  o@M |   | |
+ *   |<->:@@.  M@M |   | |
+ *   |ox  @@@o@@@@ |   | |
+ *   |    :M@@V:@@.|   | v
+ *   +-------------*---+ -
+ *   |<------------->|
+ *           w
+ */
+struct Glyph {
+    Codepoint code;
+	uint u, v;
+	ushort w, h, a, x, y;
+}
 
-#include <grapheme.h>
-#include <assert.h>
+def GlyphCache = cache::Cache(<Codepoint, Glyph, 1024>);
 
-#include "font.h"
-#include "stb_truetype.h"
-#include "stb_image_write.h"
-#include "util.h"
+// identity map the ASCII range
+fn uint Codepoint.hash(Codepoint code) => code < 128 ? code : ((uint)code).hash();
 
-#include "generic_cache.h"
-static inline unsigned int hash(unsigned int code)
-{
-	// identity map the ascii range
-	return code < 128 ? code : hash_u32(code);
+struct FontAtlas {
+	uint width, height;
+	char* atlas;
+	uint glyph_max_w, glyph_max_h;
+	int size;
+	int file_size;
+	char *file;
+	void *priv;
 }
-CACHE_DECL(cache, struct font_glyph, hash, hash_cmp_u32)
 
 
-#define UTF8(c) (c&0x80)
-#define BDEPTH 1
-#define BORDER 4
+macro is_utf8(char c) => c & 0x80;
+const uint BDEPTH = 1;
+const uint BORDER = 4;
 
-// FIXME: as of now only monospaced fonts work correctly since no kerning information
-// is stored
+// FIXME: as of now only monospaced fonts look decent since no
+//        kerning information is stored
 
-
-struct priv {
+struct Priv @private {
 	stbtt_fontinfo stb;
 	float scale;
 	int baseline;
 	unsigned char *bitmap;
 	struct cache c;
-};
-#define PRIV(x) ((struct priv *)x->priv)
+}
+//#define PRIV(x) ((struct priv *)x->priv)
 
 
 struct font_atlas * font_init(void)

text_rendering/.gitignore

@@ -1,4 +0,0 @@
-*.png
-test
-obj/**
-objlist

text_rendering/Makefile

@@ -1,18 +0,0 @@
-CC      = gcc
-# instrumentation flags
-INFLAGS = -fsanitize=address,builtin,undefined
-LDFLAGS = -lm -lgrapheme -lSDL2 -lGLEW -lGL ${INFLAGS}
-CFLAGS  = -ggdb3 -Wall -Wextra -pedantic -std=c11 -Wno-unused-function -fno-omit-frame-pointer ${INFLAGS}
-
-.PHONY: clean all
-all: test
-
-font.o: font.c font.h stb_truetype.h stb_image_write.h util.h \
- generic_cache.h generic_hash.h
-main.o: main.c ren.h util.h
-ren.o: ren.c util.h font.h ren.h generic_stack.h
-util.o: util.c util.h
-test:  font.o main.o ren.o util.o
-	${CC} ${LDFLAGS} -o test  font.o main.o ren.o util.o
-clean:
-	rm -f test  font.o main.o ren.o util.o

text_rendering/box_fragshader.glsl

@@ -1,8 +0,0 @@
-#version 330 core
-
-in vec4 col;
-
-void main()
-{
-	gl_FragColor = col;
-}

text_rendering/box_vertshader.glsl

@@ -1,19 +0,0 @@
-#version 330 core
-
-uniform ivec2 viewsize;
-
-layout(location = 0) in vec2 position;
-layout(location = 2) in vec4 color;
-
-out vec4 col;
-
-
-void main()
-{
-	vec2 v = vec2(float(viewsize.x), float(viewsize.y));
-	vec2 p = vec2(position.x*2.0/v.x - 1.0, 1.0 - position.y*2.0/v.y);
-	vec4 pos = vec4(p.x, p.y, 0.0f, 1.0f);
-
-	gl_Position = pos;
-	col = color;
-}

text_rendering/font.h

@@ -1,50 +0,0 @@
-#ifndef _FONT_H
-#define _FONT_H
-
-#include <stdint.h>
-
-/* width and height of a glyph contain the kering advance
- * (u,v)
- *   +-------------*---+ -
- *   |       ^     |   | ^
- *   |       |oy   |   | |
- *   |       v     |   | |
- *   |      .ii.   |   | |
- *   |     @@@@@@. |<->| |
- *   |    V@Mio@@o |adv| |
- *   |    :i.  V@V |   | |
- *   |      :oM@@M |   | |
- *   |    :@@@MM@M |   | |
- *   |    @@o  o@M |   | |
- *   |<->:@@.  M@M |   | |
- *   |ox  @@@o@@@@ |   | |
- *   |    :M@@V:@@.|   | v
- *   +-------------*---+ -
- *   |<------------->|
- *           w
- */
-// TODO: the advance isn't unique for every pair of characters
-struct font_glyph {
-	uint32_t codepoint;
-	uint32_t u, v;
-	uint16_t w, h, a, x, y;
-};
-
-struct font_atlas {
-	unsigned int width, height;
-	unsigned char *atlas;
-	unsigned int glyph_max_w, glyph_max_h;
-	int size;
-	int file_size;
-	char *file;
-	void *priv;
-};
-
-
-struct font_atlas * font_init(void);
-int font_load(struct font_atlas *atlas, const char *path, int size);
-int font_free(struct font_atlas *atlas);
-const struct font_glyph * font_get_glyph_texture(struct font_atlas *atlas, unsigned int code, int *updated);
-void font_dump(const struct font_atlas *atlas, const char *path);
-
-#endif

text_rendering/font_fragshader.glsl

@@ -1,18 +0,0 @@
-#version 330 core
-
-// viewsize.x = viewport width in pixels; viewsize.y = viewport height in pixels
-uniform ivec2 viewsize;
-uniform ivec2 texturesize;
-
-// texture uv coordinate in texture space
-in vec2 uv;
-uniform sampler2DRect ts;
-
-const vec3 textcolor = vec3(1.0, 1.0, 1.0);
-
-
-void main()
-{
-	//gl_FragColor = vec4(1.0f,0.0f,0.0f,1.0f);
-	gl_FragColor = vec4(textcolor, texture(ts, uv));
-}

text_rendering/font_vertshader.glsl

@@ -1,26 +0,0 @@
-#version 330 core
-
-// viewsize.x = viewport width in pixels; viewsize.y = viewport height in pixels
-uniform ivec2 viewsize;
-uniform ivec2 texturesize;
-
-// both position and and uv are in pixels, they where converted to floats when 
-// passed to the shader
-layout(location = 0) in vec2 position;
-layout(location = 1) in vec2 txcoord;
-
-out vec2 uv;
-
-void main()
-{
-	vec2 v = vec2(float(viewsize.x), float(viewsize.y));
-	
-//	vec2 p = vec2(position.x*2.0f/v.x - 1.0f, position.y*2.0f/v.y - 1.0f);
-	vec2 p = vec2(position.x*2.0/v.x - 1.0, 1.0 - position.y*2.0/v.y);
-	vec4 pos = vec4(p.x, p.y, 0.0f, 1.0f);
-
-	gl_Position = pos;
-	// since the texture is a GL_TEXTURE_RECTANGLE the coordintes do not need to
-	// be normalized
-	uv = vec2(txcoord.x, txcoord.y);
-}

text_rendering/generic_cache.h

@@ -1,126 +0,0 @@
-#ifndef CACHE_GENERIC_H
-#define CACHE_GENERIC_H
-
-
-#include "generic_hash.h"
-
-#define CACHE_SIZE 512
-#define CACHE_NCYCLES (CACHE_SIZE*2/3)
-#define CACHE_BSIZE (((CACHE_SIZE+0x3f)&(~0x3f))>>6)
-#define CACHE_BRESET(b)   for (int i = 0; i < CACHE_BSIZE; b[i++] = 0);
-#define CACHE_BSET(b, x)  b[(x)>>6] |= (uint64_t)1<<((x)&63)
-#define CACHE_BTEST(b, x) (b[(x)>>6]&((uint64_t)1<<((x)&63)))
-
-// FIXME: this cache implementation is not really generic since it expects an unsigned
-//        as the code and not a generic type
-
-
-#define CACHE_CYCLE(c)                                                         \
-{                                                                              \
-	if (++(c->cycles) > CACHE_NCYCLES) {                                   \
-		for (int i = 0; i < CACHE_BSIZE; i++) {                        \
-			c->present[i] &= c->used[i];                           \
-			c->used[i] = 0;                                        \
-		}                                                              \
-		c->cycles = 0;                                                 \
-	}                                                                      \
-}
-
-
-#define CACHE_DECL(name, type, hashfn, cmpfn)                                  \
-HASH_DECL(name##table, uint32_t, uint32_t, hashfn, cmpfn)                      \
-struct name {                                                                  \
-	struct name##table_ref *table;                                         \
-	type *array;                                                           \
-	uint64_t *present, *used;                                              \
-	int cycles;                                                            \
-};                                                                             \
-\
-\
-/* FIXME: check for allocation errors */                                       \
-struct name name##_init(void)                                                  \
-{                                                                              \
-	struct name##table_ref *t = name##table_create(CACHE_SIZE);            \
-	type *a = malloc(sizeof(type)*CACHE_SIZE);                             \
-	uint64_t *p = malloc(sizeof(uint64_t)*CACHE_BSIZE);                    \
-	uint64_t *u = malloc(sizeof(uint64_t)*CACHE_BSIZE);                    \
-	CACHE_BRESET(p);                                                       \
-	CACHE_BRESET(u);                                                       \
-	return (struct name){.table=t, .array=a, .present=p, .used=u, 0};      \
-}                                                                              \
-\
-\
-void name##_free(struct name *cache)                                           \
-{                                                                              \
-	if (cache) {                                                           \
-		name##table_destroy(cache->table);                             \
-		free(cache->array);                                            \
-		free(cache->present);                                          \
-		free(cache->used);                                             \
-	}                                                                      \
-}                                                                              \
-\
-\
-const type * name##_search(struct name *cache, uint32_t code)                  \
-{                                                                              \
-	if (!cache) return NULL;                                               \
-	struct name##table_entry *r;                                           \
-	r = name##table_search(cache->table, code);                            \
-	/* MISS */                                                             \
-	if (!r || !cmpfn(code, r->code))                                       \
-		return NULL;                                                   \
-	/* MISS, the data is not valid (not present) */                        \
-	if (!CACHE_BTEST(cache->present, r->data))                             \
-		return NULL;                                                   \
-	/* HIT, set as recently used */                                        \
-	CACHE_BSET(cache->used, r->data);                                      \
-	return (&cache->array[r->data]);                                       \
-}                                                                              \
-\
-\
-/* Look for a free spot in the present bitmap and return its index */          \
-/* If there is no free space left then just return the first position */       \
-int name##_get_free_spot(struct name *cache)                                   \
-{                                                                              \
-	if (!cache) return -1;                                                 \
-	int x = 0;                                                             \
-	for (int b = 0; b < CACHE_BSIZE; b++) {                                \
-		if (cache->present[b] == 0) x = 64;                            \
-		else x = __builtin_clzll(cache->present[b]);                   \
-		x = 64-x;                                                      \
-		if (!CACHE_BTEST(cache->present, x+64*b))                      \
-			return x+64*b;                                         \
-	}                                                                      \
-	return 0;                                                              \
-}                                                                              \
-\
-\
-const type * name##_insert_at(struct name *cache, const type *g, uint32_t code, int x)\
-{                                                                              \
-	if (!cache) return NULL;                                               \
-	type *spot = NULL;                                                     \
-	/* check if the spot is valid */                                       \
-	if (x < 0) return NULL;                                                \
-	/* Set used and present */                                             \
-	CACHE_BSET(cache->present, x);                                         \
-	CACHE_BSET(cache->used, x);                                            \
-	CACHE_CYCLE(cache)                                                     \
-	spot = &(cache->array[x]);                                             \
-	*spot = *g;                                                            \
-	struct name##table_entry e = { .code = code, .data = x};               \
-	if (!name##table_insert(cache->table, &e))                             \
-		return NULL;                                                   \
-	return spot;                                                           \
-}                                                                              \
-\
-\
-const type * name##_insert(struct name *cache, const type *g, uint32_t code, int *x)\
-{                                                                              \
-	int y;                                                                 \
-	if (!x) x = &y;                                                        \
-	*x = name##_get_free_spot(cache);                                      \
-	return name##_insert_at(cache, g, code, *x);                           \
-}                                                                              \
-
-
-#endif

text_rendering/generic_hash.h

@@ -1,134 +0,0 @@
-#ifndef _HASH_GENERIC
-#define _HASH_GENERIC
-
-#include <string.h>
-#include <stdlib.h>
-#include <stdint.h>
-
-
-#define HASH_MAXSIZE 4096
-// for fibonacci hashing, 2^{32,64}/<golden ratio>
-#define HASH_RATIO32 ((uint64_t)2654435769u)
-#define HASH_RATIO64 ((uint64_t)11400714819322457583u)
-// salt for string hashing
-#define HASH_SALT ((uint64_t)0xbabb0cac)
-
-
-/* Ready-made compares */
-static inline int hash_cmp_u32(uint32_t a, uint32_t b) { return a == b; }
-static inline int hash_cmp_u64(uint64_t a, uint64_t b) { return a == b; }
-static inline int hash_cmp_str(const char *a, const char *b) { return strcmp(a, b) == 0; }
-
-
-/* Ready-made hashes */
-static inline uint32_t hash_u64(uint64_t c)
-{
-	return (uint64_t)((((uint64_t)c+HASH_SALT)*HASH_RATIO64)>>32);
-}
-static inline uint32_t hash_u32(uint32_t c)
-{
-	return (uint32_t)((((uint64_t)c<<31)*HASH_RATIO64)>>32);
-}
-static inline uint32_t hash_str(const char *s)
-{
-	uint32_t h = HASH_SALT;
-	const uint8_t *v = (const uint8_t *)(s);
-	for (int x = *s; x; x--) {
-		h += v[x-1];
-		h += h << 10;
-		h ^= h >> 6;
-	}
-	h += h << 3;
-  	h ^= h >> 11;
-  	h += h << 15;
-	return h;
-}
-
-
-#define HASH_DECL(htname, codetype, datatype, hashfn, cmpfn)                   \
-struct htname##_entry {                                                        \
-	codetype code;                                                         \
-	datatype data;                                                         \
-};                                                                             \
-\
-struct htname##_ref {                                                          \
-	uint32_t items, size, exp;                                             \
-	struct htname##_entry bucket[];                                        \
-};                                                                             \
-\
-\
-struct htname##_ref * htname##_create(uint32_t size)                           \
-{                                                                              \
-	if (!size || size > HASH_MAXSIZE)                                      \
-		return NULL;                                                   \
-	/* round to the greater power of two */                                \
-	/* FIXME: check for intger overflow here */                            \
-	uint32_t exp = 32-__builtin_clz(size-1);                               \
-	size = 1<<(exp);                                                       \
-	/* FIXME: check for intger overflow here */                            \
-	struct htname##_ref *ht = malloc(sizeof(struct htname##_ref)+sizeof(struct htname##_entry)*size); \
-	if (ht) {                                                              \
-		ht->items = 0;                                                 \
-		ht->size  = size;                                              \
-		ht->exp   = exp;                                               \
-		memset(ht->bucket, 0, sizeof(struct htname##_entry)*size);     \
-	}                                                                      \
-	return ht;                                                             \
-}                                                                              \
-\
-\
-void htname##_destroy(struct htname##_ref *ht)                                 \
-{                                                                              \
-	if (ht) free(ht);                                                      \
-}                                                                              \
-\
-\
-static uint32_t htname##_lookup(struct htname##_ref *ht, uint32_t hash, uint32_t idx) \
-{                                                                              \
-	if (!ht) return 0;                                                     \
-	uint32_t mask = ht->size-1;                                            \
-	uint32_t step = (hash >> (32 - ht->exp)) | 1;                          \
-	return (idx + step) & mask;                                            \
-}                                                                              \
-\
-\
-/* Find and return the element by code */                                      \
-struct htname##_entry * htname##_search(struct htname##_ref *ht, codetype code)\
-{                                                                              \
-	if (!ht) return NULL;                                                  \
-	uint32_t h = hashfn(code);                                             \
-	for (uint32_t i=h, x=0; ; x++) {                                       \
-		i = htname##_lookup(ht, h, i);                                 \
-		if (x > (ht->size<<1)   ||                                     \
-		    !ht->bucket[i].code ||                                     \
-		    cmpfn(ht->bucket[i].code, code)                            \
-		) {                                                            \
-			return &(ht->bucket[i]);                               \
-		}                                                              \
-	}                                                                      \
-	return NULL;                                                           \
-}                                                                              \
-\
-\
-/* FIXME: this simply overrides the found item */                              \
-struct htname##_entry * htname##_insert(struct htname##_ref *ht, struct htname##_entry *entry) \
-{                                                                              \
-	struct htname##_entry *r = htname##_search(ht, entry->code);           \
-	if (r) {                                                               \
-		if (!r->code)                                                  \
-			ht->items++;                                           \
-		*r = *entry;                                                   \
-	}                                                                      \
-	return r;                                                              \
-}                                                                              \
-\
-\
-struct htname##_entry * htname##_remove(struct htname##_ref *ht, codetype code)\
-{                                                                              \
-	if (!ht) return NULL;                                                  \
-	struct htname##_entry *r = htname##_search(ht, code);                  \
-	if (r) r->code = 0;                                                    \
-	return r;                                                              \
-}                                                                              \
-
-#endif

text_rendering/generic_stack.h

@@ -1,118 +0,0 @@
-#ifndef _STACK_GENERIC_H
-#define _STACK_GENERIC_H
-
-
-#define STACK_STEP 8
-#define STACK_SALT 0xbabb0cac
-
-// FIXME: find a way to not re-hash the whole stack when removing one item
-
-// incremental hash for every grow
-#if STACK_DISABLE_HASH
-#define STACK_HASH(p, s, h) {}
-#else
-#define STACK_HASH(p, s, h)                                                    \
-{                                                                              \
-	unsigned char *v = (unsigned char *)(p);                               \
-	for (int x = (s); x; x--) {                                            \
-		(h) += v[x-1];                                                 \
-		(h) += (h) << 10;                                              \
-		(h) ^= (h) >> 6;                                               \
-	}                                                                      \
-	(h) += (h) << 3;                                                       \
-  	(h) ^= (h) >> 11;                                                      \
-  	(h) += (h) << 15;                                                      \
-}
-#endif
-
-
-// TODO: add a rolling hash
-#define STACK_DECL(stackname, type)                                            \
-struct stackname {                                                             \
-	type *items;                                                           \
-	int size, idx, old_idx;                                                \
-	unsigned int hash, old_hash;                                           \
-};                                                                             \
-\
-\
-struct stackname stackname##_init(void)                                        \
-{                                                                              \
-	return (struct stackname){0, .hash = STACK_SALT};                      \
-}                                                                              \
-\
-\
-int stackname##_grow(struct stackname *stack, int step)                        \
-{                                                                              \
-	if (!stack)                                                            \
-		return -1;                                                     \
-	stack->items = realloc(stack->items, (stack->size+step)*sizeof(type)); \
-	if(!stack->items)                                                      \
-		return -1;                                                     \
-	memset(&(stack->items[stack->size]), 0, step*sizeof(*(stack->items))); \
-	stack->size += step;                                                   \
-	return 0;                                                              \
-}                                                                              \
-\
-\
-int stackname##_push(struct stackname *stack, type *e)                         \
-{                                                                              \
-	if (!stack || !e)                                                      \
-		return -1;                                                     \
-	if (stack->idx >= stack->size)                                         \
-		if (stackname##_grow(stack, STACK_STEP))                       \
-			return -1;                                             \
-	stack->items[stack->idx++] = *e;                                       \
-	STACK_HASH(e, sizeof(type), stack->hash);                              \
-	return 0;                                                              \
-}                                                                              \
-\
-\
-type stackname##_pop(struct stackname *stack)                                  \
-{                                                                              \
-	if (!stack || stack->idx == 0 || stack->size == 0)                     \
-		return (type){0};                                              \
-	stack->hash = STACK_SALT;                                              \
-	STACK_HASH(stack->items, sizeof(type)*(stack->idx-1), stack->hash);    \
-	return stack->items[stack->idx--];                                     \
-}                                                                              \
-\
-\
-int stackname##_clear(struct stackname *stack)                                 \
-{                                                                              \
-	if (!stack)                                                            \
-		return -1;                                                     \
-	stack->old_idx = stack->idx;                                           \
-	stack->old_hash = stack->hash;                                         \
-	stack->hash = STACK_SALT;                                              \
-	stack->idx = 0;                                                        \
-	return 0;                                                              \
-}                                                                              \
-\
-\
-int stackname##_changed(struct stackname *stack)                               \
-{                                                                              \
-	if (!stack)                                                            \
-		return -1;                                                     \
-	return stack->hash != stack->old_hash;                                 \
-}                                                                              \
-\
-\
-int stackname##_size_changed(struct stackname *stack)                          \
-{                                                                              \
-	if (!stack)                                                            \
-		return -1;                                                     \
-	return stack->size != stack->old_idx;                                  \
-}                                                                              \
-\
-\
-int stackname##_free(struct stackname *stack)                                  \
-{                                                                              \
-	if (stack) {                                                           \
-		stackname##_clear(stack);                                      \
-		if (stack->items)                                              \
-			free(stack->items);                                    \
-	}                                                                      \
-	return 0;                                                              \
-}                                                                              \
-
-#endif

text_rendering/genmake.sh

@@ -1,46 +0,0 @@
-#!/bin/sh
-
-genobj() {
-	#echo "$1" | sed -e 's/^/obj\//' -e 's/\.c/\.o/'
-	echo "$1" | sed -e 's/\.c/\.o/'
-}
-
-genrule() {
-	#gcc -MM "$1" | sed 's/^/obj\//'
-	gcc -MM "$1"
-}
-
-
-rm -f objlist
-
-cat > Makefile << EOF
-CC      = gcc
-# instrumentation flags
-INFLAGS = -fsanitize=address,builtin,undefined
-LDFLAGS = -lm -lgrapheme -lSDL2 -lGLEW -lGL \${INFLAGS}
-CFLAGS  = -ggdb3 -Wall -Wextra -pedantic -std=c11 \
--Wno-unused-function -fno-omit-frame-pointer \${INFLAGS}
-
-.PHONY: clean all
-all: test
-
-EOF
-
-for f in *.c; do
-	genrule $f >> Makefile
-	genobj $f >> objlist
-done
-
-mainrule='test: '
-linkcmd='	${CC} ${LDFLAGS} -o test '
-cleanrule='clean:
-	rm -f test '
-while IFS="" read -r line; do
-	mainrule="$mainrule $line"
-	linkcmd="$linkcmd $line"
-	cleanrule="$cleanrule $line"
-done < objlist
-
-echo "$mainrule"  >> Makefile
-echo "$linkcmd"   >> Makefile
-echo "$cleanrule" >> Makefile

text_rendering/main.c

@@ -1,96 +0,0 @@
-#include <SDL2/SDL.h>
-#include <SDL2/SDL_events.h>
-#include <SDL2/SDL_video.h>
-#include <stdlib.h>
-#include <locale.h>
-#include <stdio.h>
-
-#include "ren.h"
-#include "util.h"
-
-
-//const char *str1 = "Ciao Mamma!\nprova: òçà°ù§|¬³¼$£ì\t";
-const char *str1 = "ciao\tmamma";
-const char *str2 = "The quick brown fox jumps over the lazy dog\n"
-	"чащах юга жил бы цитрус? Да, но фальшивый экземпляр!\n"
-	"Pijamalı hasta, yağız şoföre çabucak güvendi\n"
-	"Pchnąć w tę łódź jeża lub ośm skrzyń fig\n"
-	"イロハニホヘト チリヌルヲ ワカヨタレソ ツネナラム ウヰノオクヤマ ケフコエテ アサキユメミシ ヱヒモセスン\n"
-	"Kæmi ný öxi hér ykist þjófum nú bæði víl og ádrepa";
-SDL_Window *win;
-
-
-#define red  0xff0000ff
-#define blue 0xffff0000
-void draw(void)
-{
-	static unsigned int frame = 0;
-	printf("frame: %d\n", frame++);
-	ren_clear();
-	//ren_render_box(10, 10, 400, 50, blue);
-	//if (ren_render_text(str1, 10, 10, 400, 50, 20))
-	//	printf("text: %s\n", ren_strerror());
-	int w, h;
-	ren_get_text_box(str2, &w, &h, 20);
-	//printf("box for: %s -> (%d, %d)\n", str2, w, h);
-	ren_render_box(0, 0, w, h, blue);
-	ren_render_text(str2, 0, 0, w, h, 20);
-
-	// fixme: this causes a bug
-	const char *s = "ciao mamma";
-	ren_get_text_box(s, &w, &h, 12);
-	s = "stuff that was not in font size 12 -> чащаx";
-	ren_render_box(0, 200, w, h, red);
-	if (ren_render_text(s, 0, 200, 0xffff, 0xffff, 12))
-		printf("BUG\n");
-
-	SDL_GL_SwapWindow(win);
-}
-
-
-int main(void)
-{
-	setlocale(LC_ALL, "en_US.UTF-8");
-
-	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
-	SDL_SetHint(SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR, "0");
-	SDL_SetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, "1");
-	SDL_SetHint(SDL_HINT_VIDEO_HIGHDPI_DISABLED, "0");
-
-	win = SDL_CreateWindow(
-		"test render",
-		SDL_WINDOWPOS_UNDEFINED,
-		SDL_WINDOWPOS_UNDEFINED,
-		500,
-		500,
-		SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
-	if (ren_init(win)) {
-		printf("renderer init error: %s\n", ren_strerror());
-		return 1;
-	}
-
-	SDL_Event e;
-	while(1) {
-		SDL_WaitEvent(&e);
-		if (e.type == SDL_QUIT)
-			break;
-		if (e.type == SDL_WINDOWEVENT) {
-			switch (e.window.event) {
-			case SDL_WINDOWEVENT_RESIZED:
-			case SDL_WINDOWEVENT_SIZE_CHANGED:
-				ren_update_viewport(e.window.data1, e.window.data2);
-				draw();
-				break;
-			case SDL_WINDOWEVENT_EXPOSED:
-				draw();
-				break;
-			default: break;
-			}
-		}
-	}
-
-	ren_free();
-	SDL_DestroyWindow(win);
-	SDL_Quit();
-	return 0;
-}

text_rendering/ren.c

@@ -1,826 +0,0 @@
-#include <SDL2/SDL.h>
-#include <GL/glew.h>
-#include <SDL2/SDL_opengl.h>
-#include <SDL2/SDL_video.h>
-#include <ctype.h>
-#include <grapheme.h>
-#include <stdio.h>
-
-#include "util.h"
-#include "font.h"
-#include "ren.h"
-
-
-#define GLERR(x)                                                               \
-{                                                                              \
-	int a = glGetError();                                                  \
-	if (a != GL_NO_ERROR)                                                  \
-		printf("(%s:%d %s:%s) glError: 0x%x %s\n",                     \
-			__FILE__, __LINE__, __func__, x, a, glerr[a&0xff]);    \
-}
-#define GL(f) f; GLERR(#f)
-#define REN_RET(a,b) {ren_errno = b; return a;}
-
-
-enum REN_ERR {
-	REN_SUCCESS = 0,
-	REN_ERRNO,
-	REN_INVAL,
-	REN_VERTEX,
-	REN_FRAGMENT,
-	REN_PROGRAM,
-	REN_COMPILE,
-	REN_LINK,
-	REN_TEXTURE,
-	REN_CONTEXT,
-	REN_GLEW,
-	REN_FONT,
-	REN_BUFFER,
-	REN_UNIFORM,
-};
-
-
-// TODO: make a macro for enum-associated string arrays
-const char * ren_err_msg[] = {
-	[REN_SUCCESS]  = "Success",
-	[REN_ERRNO]    = "Look at errno",
-	[REN_INVAL]    = "Invalid or NULL arguments",
-	[REN_VERTEX]   = "Failed to create opengl vertex shader",
-	[REN_FRAGMENT] = "Failed to create opengl fragment shader",
-	[REN_PROGRAM]  = "Failed to create opengl program",
-	[REN_COMPILE]  = "Failed to compile shaders",
-	[REN_LINK]     = "Failed to link shaders",
-	[REN_TEXTURE]  = "Failed to create texture",
-	[REN_CONTEXT]  = "Failed to create SDL OpenGL context",
-	[REN_GLEW]     = "GLEW Error",
-	[REN_FONT]     = "Font Error",
-	[REN_BUFFER]   = "Failed to create opengl buffer",
-	[REN_UNIFORM]  = "Failed to get uniform location",
-};
-
-#define ELEM(x) [x&0xff] = #x,
-const char *glerr[] = {
-	ELEM(GL_INVALID_ENUM)
-	ELEM(GL_INVALID_VALUE)
-	ELEM(GL_INVALID_OPERATION)
-	ELEM(GL_OUT_OF_MEMORY)
-};
-#undef ELEM
-
-
-// different stacks
-#include "generic_stack.h"
-STACK_DECL(vtstack, struct v_text)
-STACK_DECL(vcstack, struct v_col)
-
-
-struct ren_font {
-	struct font_atlas *font;
-	GLuint texture;
-};
-
-struct {
-	SDL_GLContext *gl;
-	struct ren_font *fonts;
-	int fonts_no;
-	GLuint font_prog;
-	GLuint box_prog;
-	GLuint font_buffer;
-	GLuint box_buffer;
-	GLint  viewsize_loc;
-	GLint  box_viewsize_loc;
-	GLint texturesize_loc;
-	struct vtstack font_stack;
-	struct vcstack box_stack;
-	int width, height;
-	int s_x, s_y, s_w, s_h;
-	int tabsize;
-} ren = {0};
-
-
-static int ren_errno;
-
-
-// print shader compilation errors
-static int shader_compile_error(GLuint shader, const char *path)
-{
-	GLint status;
-	GL(glGetShaderiv(shader, GL_COMPILE_STATUS, &status))
-	if (status != GL_FALSE)
-		return 0;
-
-	GLint log_length;
-	GL(glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_length))
-
-	GLchar *log_str = emalloc((log_length + 1)*sizeof(GLchar));
-	GL(glGetShaderInfoLog(shader, log_length, NULL, log_str))
-
-	const char *shader_type_str = NULL;
-	GLint shader_type;
-	GL(glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type))
-	switch(shader_type) {
-	case GL_VERTEX_SHADER:   shader_type_str = "vertex";   break;
-	case GL_GEOMETRY_SHADER: shader_type_str = "geometry"; break;
-	case GL_FRAGMENT_SHADER: shader_type_str = "fragment"; break;
-	}
-
-	fprintf(stderr, "Compile failure in %s shader %s:\n%s\n", shader_type_str, path, log_str);
-	efree(log_str);
-	return -1;
-}
-
-
-// print shader link errors
-static int shader_link_error(GLuint prog)
-{
-	GLint status;
-	GL(glGetProgramiv(prog, GL_LINK_STATUS, &status))
-	if (status != GL_FALSE)
-		return 0;
-
-	GLint log_length;
-	GL(glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &log_length))
-
-	GLchar *log_str = emalloc((log_length + 1)*sizeof(GLchar));
-	GL(glGetProgramInfoLog(prog, log_length, NULL, log_str))
-	fprintf(stderr, "Linker failure: %s\n", log_str);
-	efree(log_str);
-
-	return -1;
-}
-
-
-static GLuint shader_compile(const char *path, const char *shader, GLuint type)
-{
-	GLuint s;
-	// initialize the vertex shader and get the corresponding id
-	s = GL(glCreateShader(type))
-	if (!s) REN_RET(0, REN_VERTEX)
-	// get the shader into opengl
-	GL(glShaderSource(s, 1, &shader, NULL))
-	GL(glCompileShader(s))
-	if (shader_compile_error(s, path))
-		REN_RET(0, REN_COMPILE)
-	return s;
-}
-
-
-const char * ren_strerror(void)
-{
-	return ren_err_msg[ren_errno % (sizeof(ren_err_msg)/sizeof(char *))];
-}
-
-
-// compile a vertex shader (vs_path) and a fragment shader (fs_path) into an opengl
-// program and return it's index
-static GLuint ren_compile_program(const char *vs_path, const char *fs_path)
-{
-	GLuint gl_vertshader, gl_fragshader, prog;
-
-	if (!vs_path || !fs_path)
-		REN_RET(0, REN_INVAL)
-
-	char *str = NULL;
-
-	dump_file(vs_path, &str, NULL);
-	if (!str) REN_RET(0, REN_ERRNO)
-	gl_vertshader = shader_compile(vs_path, str, GL_VERTEX_SHADER);
-	efree(str);
-	if (!gl_vertshader)
-		return 0;
-
-	dump_file(fs_path, &str, NULL);
-	if (!str) REN_RET(0, REN_ERRNO)
-	gl_fragshader = shader_compile(fs_path, str, GL_FRAGMENT_SHADER);
-	efree(str);
-	if (!gl_fragshader)
-		return 0;
-
-
-	// create the main program object, it is an amalgamation of all shaders
-	prog = GL(glCreateProgram())
-	if (!prog) REN_RET(0, REN_PROGRAM)
-
-	// attach the shaders to the program (set which shaders are present)
-	GL(glAttachShader(prog, gl_vertshader))
-	GL(glAttachShader(prog, gl_fragshader))
-	// then link the program (basically the linking stage of the program)
-	GL(glLinkProgram(prog))
-	if (shader_link_error(prog))
-		REN_RET(0, REN_LINK)
-
-	// after linking the shaders can be detached and the source freed from
-	// memory since the program is ready to use
-	GL(glDetachShader(prog, gl_vertshader))
-	GL(glDetachShader(prog, gl_fragshader))
-
-	return prog;
-}
-
-
-static void set_texture_parameters(GLuint type, GLuint wrap_s, GLuint wrap_t, GLuint upscale, GLuint downscale)
-{
-	GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrap_s))
-	GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrap_t))
-	GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, upscale))
-	GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, downscale))
-}
-
-
-static GLuint ren_texturergb_2d(const char *buf, int w, int h, int upscale, int downscale)
-{
-	GLuint t;
-
-	if (!buf || w <= 0 || h <= 0)
-		REN_RET(0, REN_INVAL)
-
-	GL(glGenTextures(1, &t))
-	if (!t) REN_RET(0, REN_TEXTURE)
-
-	GL(glBindTexture(GL_TEXTURE_2D, t))
-	GL(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, buf))
-
-	set_texture_parameters(GL_TEXTURE_2D, GL_REPEAT, GL_REPEAT, upscale, downscale);
-
-	return t;
-}
-
-
-static GLuint ren_texturergba_2d(const char *buf, int w, int h, int upscale, int downscale)
-{
-	GLuint t;
-
-	if (!buf || w <= 0 || h <= 0)
-		REN_RET(0, REN_INVAL)
-
-	GL(glGenTextures(1, &t))
-	if (!t) REN_RET(0, REN_TEXTURE)
-
-	GL(glBindTexture(GL_TEXTURE_2D, t))
-	GL(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, buf))
-	set_texture_parameters(GL_TEXTURE_2D, GL_REPEAT, GL_REPEAT, upscale, downscale);
-
-	return t;
-}
-
-
-static GLuint ren_texturer_2d(const char *buf, int w, int h, int upscale, int downscale)
-{
-	GLuint t;
-
-	if (!buf || w <= 0 || h <= 0)
-		REN_RET(0, REN_INVAL)
-
-	GL(glGenTextures(1, &t))
-	if (!t) REN_RET(0, REN_TEXTURE)
-
-	GL(glBindTexture(GL_TEXTURE_2D, t))
-	GL(glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, buf))
-	set_texture_parameters(GL_TEXTURE_2D, GL_REPEAT, GL_REPEAT, upscale, downscale);
-
-	return t;
-}
-
-
-static GLuint ren_texturer_rect(const char *buf, int w, int h, int upscale, int downscale)
-{
-	GLuint t;
-
-	if (!buf || w <= 0 || h <= 0)
-		REN_RET(0, REN_INVAL)
-
-	GL(glGenTextures(1, &t))
-	if (!t) REN_RET(0, REN_TEXTURE)
-
-	GL(glBindTexture(GL_TEXTURE_RECTANGLE, t))
-	GL(glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RED, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, buf))
-	// a limitation of recatngle textures is that the wrapping mode is limited
-	// to either clamp-to-edge or clamp-to-border
-	set_texture_parameters(GL_TEXTURE_RECTANGLE, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, upscale, downscale);
-
-	return t;
-}
-
-
-// FIXME: update only the newly generated character instead of the whole texture
-static int update_font_texture(int idx)
-{
-	GL(glUseProgram(ren.font_prog))
-	GL(glTexSubImage2D(
-		GL_TEXTURE_RECTANGLE,
-		0, 0, 0,
-		ren.fonts[idx].font->width,
-		ren.fonts[idx].font->height,
-		GL_RED,
-		GL_UNSIGNED_BYTE,
-		ren.fonts[idx].font->atlas))
-	//font_dump(ren.fonts[idx].font, "./atlas.png");
-	GL(glUseProgram(0));
-	return 0;
-}
-
-
-// loads a font and returns it's index in the fonts array
-static int ren_load_font(int size, const char *path)
-{
-	int idx = ren.fonts_no;
-	struct font_atlas *f;
-	ren.fonts = erealloc(ren.fonts, sizeof(struct ren_font)*(idx+1));
-	ren.fonts[idx].font = font_init();
-	f = ren.fonts[idx].font;
-	if (!f)
-		REN_RET(-1, REN_FONT)
-
-	if (!path)
-		path = DEFAULT_FONT;
-
-	if (font_load(f, path, size))
-		REN_RET(-1, REN_FONT)
-	//font_dump(f, "./atlas.png");
-
-	// load font texture (atlas)
-	ren.fonts[idx].texture = ren_texturer_rect(
-		(const char *)f->atlas,
-		f->width,
-		f->height,
-		GL_LINEAR, GL_LINEAR);
-	if (!ren.fonts[idx].texture)
-		return -1;
-
-	ren.fonts_no = idx+1;
-	return idx;
-}
-
-
-// returns the index to the ren.fonts array to the font with the correct size
-// return -1 on errror
-static int ren_get_font(int size)
-{
-	for (int i = 0; i < ren.fonts_no; i++) {
-		if (ren.fonts[i].font->size == size)
-			return i;
-	}
-	// TODO: add a way to change font family
-	return ren_load_font(size, NULL);
-}
-
-
-int ren_init(SDL_Window *w)
-{
-	// Initialize OpenGL
-	if (!w)
-		REN_RET(-1, REN_INVAL)
-	// using version 3 does not allow to use glVertexAttribPointer() without
-	// vertex buffer objects, so use compatibility mode
-	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_COMPATIBILITY);
-	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
-	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
-	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
-	ren.gl = SDL_GL_CreateContext(w);
-	if (!ren.gl) {
-		printf("SDL: %s\n", SDL_GetError());
-		REN_RET(-1, REN_CONTEXT)
-	}
-
-	GL(glEnable(GL_BLEND))
-	GL(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA))
-	GL(glDisable(GL_CULL_FACE))
-	GL(glDisable(GL_DEPTH_TEST))
-	GL(glEnable(GL_SCISSOR_TEST))
-	GL(glEnable(GL_TEXTURE_2D))
-	GL(glEnable(GL_TEXTURE_RECTANGLE))
-
-	GLenum glew_err = glewInit();
-	if (glew_err != GLEW_OK)
-		REN_RET(glew_err, REN_GLEW);
-
-	// Create stacks
-	ren.font_stack = vtstack_init();
-	ren.box_stack  = vcstack_init();
-	// generate the font buffer object
-	GL(glGenBuffers(1, &ren.font_buffer))
-	if (!ren.font_buffer) REN_RET(-1, REN_BUFFER)
-	GL(glGenBuffers(1, &ren.box_buffer))
-	if (!ren.box_buffer) REN_RET(-1, REN_BUFFER)
-
-	// Compile font shaders
-	ren.font_prog = ren_compile_program(FONT_VERSHADER, FONT_FRAGSHADER);
-	if (!ren.font_prog) return -1;
-	// create the uniforms, if the returned value is -1 then the uniform may have
-	// been optimized away, in any case do not return, just give a warning
-	ren.viewsize_loc = GL(glGetUniformLocation(ren.font_prog, "viewsize"))
-	if (ren.viewsize_loc == -1)
-		printf("uniform %s was optimized away\n", "viewsize");
-	ren.texturesize_loc = GL(glGetUniformLocation(ren.font_prog, "texturesize"))
-	if (ren.texturesize_loc == -1)
-		printf("uniform %s was optimized away\n", "texturesize");
-
-	// Compile box shaders
-	ren.box_prog = ren_compile_program(BOX_VERSHADER, BOX_FRAGSHADER);
-	if (!ren.box_prog) return -1;
-	ren.box_viewsize_loc = GL(glGetUniformLocation(ren.box_prog, "viewsize"))
-	if (ren.box_viewsize_loc == -1)
-		printf("uniform %s was optimized away\n", "viewsize");
-
-	// Finishing touches
-	ren.tabsize = REN_TABSIZE;
-	int width, height;
-	SDL_GetWindowSize(w, &width, &height);
-	ren_update_viewport(width, height);
-	GL(glClearColor(0.3f, 0.3f, 0.3f, 0.f))
-	GL(glClear(GL_COLOR_BUFFER_BIT))
-
-	return 0;
-}
-
-
-int ren_clear(void)
-{
-	GL(glScissor(0, 0, ren.width, ren.height))
-	GL(glClear(GL_COLOR_BUFFER_BIT));
-	return 0;
-}
-
-
-// idx refers to the fonts array index, this means that when drawing the font stack
-// only one font size at the time can be used
-static int ren_draw_font_stack(int idx)
-{
-	struct font_atlas *font = ren.fonts[idx].font;
-	GLuint font_texture = ren.fonts[idx].texture;
-
-	GL(glUseProgram(ren.font_prog))
-	GL(glBindTexture(GL_TEXTURE_RECTANGLE, font_texture))
-
-	GL(glViewport(0, 0, ren.width, ren.height))
-	// this has caused me some trouble, convert from image coordiates to viewport
-	GL(glScissor(ren.s_x, ren.height-ren.s_y-ren.s_h, ren.s_w, ren.s_h))
-	GL(glUniform2i(ren.viewsize_loc, ren.width, ren.height))
-	GL(glUniform2i(ren.texturesize_loc, font->width, font->height))
-
-	GL(glBindBuffer(GL_ARRAY_BUFFER, ren.font_buffer))
-	if (vtstack_changed(&ren.font_stack)) {
-		if (vtstack_size_changed(&ren.font_stack)) {
-			GL(glBufferData(
-				GL_ARRAY_BUFFER,
-				ren.font_stack.idx*sizeof(struct v_text),
-				ren.font_stack.items,
-				GL_DYNAMIC_DRAW))
-		} else {
-			GL(glBufferSubData(
-				GL_ARRAY_BUFFER,
-				0,
-				ren.font_stack.idx*sizeof(struct v_text),
-				ren.font_stack.items))
-		}
-	}
-	// when passing ints to glVertexAttribPointer they are automatically
-	// converted to floats
-	GL(glVertexAttribPointer(
-		REN_VERTEX_IDX,
-		2,
-		GL_INT,
-		GL_FALSE,
-		sizeof(struct v_text),
-		0))
-	GL(glVertexAttribPointer(
-		REN_UV_IDX,
-		2,
-		GL_INT,
-		GL_FALSE,
-		sizeof(struct v_text),
-		(void*)sizeof(vec2_i)))
-	GL(glEnableVertexAttribArray(REN_VERTEX_IDX))
-	GL(glEnableVertexAttribArray(REN_UV_IDX))
-
-	GL(glDrawArrays(GL_TRIANGLES, 0, ren.font_stack.idx))
-
-	GL(glDisableVertexAttribArray(REN_VERTEX_IDX))
-	GL(glDisableVertexAttribArray(REN_UV_IDX))
-	GL(glBindBuffer(GL_ARRAY_BUFFER, 0))
-	GL(glBindTexture(GL_TEXTURE_RECTANGLE, 0))
-	GL(glUseProgram(0))
-
-	vtstack_clear(&ren.font_stack);
-	return 0;
-}
-
-
-static int ren_draw_box_stack(void)
-{
-	GL(glUseProgram(ren.box_prog))
-
-	GL(glViewport(0, 0, ren.width, ren.height))
-	GL(glScissor(0, 0, ren.width, ren.height))
-	GL(glUniform2i(ren.box_viewsize_loc, ren.width, ren.height))
-
-	GL(glBindBuffer(GL_ARRAY_BUFFER, ren.box_buffer))
-	if(vcstack_changed(&ren.box_stack)) {
-		if (vcstack_size_changed(&ren.box_stack)) {
-			GL(glBufferData(
-				GL_ARRAY_BUFFER,
-				ren.box_stack.idx*sizeof(struct v_col),
-				ren.box_stack.items,
-				GL_DYNAMIC_DRAW))
-		} else {
-			GL(glBufferSubData(
-				GL_ARRAY_BUFFER,
-				0,
-				ren.box_stack.idx*sizeof(struct v_col),
-				ren.box_stack.items))
-		}
-	}
-	// when passing ints to glVertexAttribPointer they are automatically
-	// converted to floats
-	GL(glVertexAttribPointer(
-		REN_VERTEX_IDX,
-		2,
-		GL_INT,
-		GL_FALSE,
-		sizeof(struct v_col),
-		0))
-	// the color gets normalized
-	GL(glVertexAttribPointer(
-		REN_COLOR_IDX,
-		4,
-		GL_INT,
-		GL_TRUE,
-		sizeof(struct v_col),
-		(void*)sizeof(vec2_i)))
-	GL(glEnableVertexAttribArray(REN_VERTEX_IDX))
-	GL(glEnableVertexAttribArray(REN_COLOR_IDX))
-
-	GL(glDrawArrays(GL_TRIANGLES, 0, ren.box_stack.idx))
-
-	GL(glDisableVertexAttribArray(REN_VERTEX_IDX))
-	GL(glDisableVertexAttribArray(REN_COLOR_IDX))
-	GL(glBindBuffer(GL_ARRAY_BUFFER, 0))
-	GL(glUseProgram(0))
-
-	vcstack_clear(&ren.box_stack);
-	return 0;
-}
-
-
-int ren_update_viewport(int w, int h)
-{
-	ren.width = w;
-	ren.height = h;
-	return 0;
-}
-
-
-int ren_set_scissor(int x, int y, int w, int h)
-{
-	ren.s_x = x;
-	ren.s_y = y;
-	ren.s_w = w;
-	ren.s_h = h;
-	return 0;
-}
-
-
-static int ren_push_glyph(const struct font_glyph *g, int gx, int gy)
-{
-	/* x4,y4        x3,y3
-	 * o-------------+
-	 * |(x,y)       /|
-	 * |          /  |
-	 * |   2    /    |
-	 * |      /      |
-	 * |    /        |
-	 * |  /     1    |
-	 * |/            |
-	 * +-------------+
-	 * x1,y1        x2,y2 */
-	struct v_text v;
-	struct font_glyph c;
-	c = *g;
-	//printf("g: u=%d v=%d w=%d h=%d a=%d x=%d y=%d\n", c.u, c.v, c.w, c.h, c.a, c.x, c.y);
-	//printf("v: x=%d y=%d u=%d v=%d\n", v.pos.x, v.pos.y, v.uv.u, v.uv.v);
-	// x1,y1
-	v = (struct v_text){
-		.pos = { .x = gx+c.x, .y = gy+c.y+c.h   },
-		.uv  = { .u = c.u,    .v = c.v+c.h },
-	};
-	vtstack_push(&ren.font_stack, &v);
-	// x2,y2
-	v = (struct v_text){
-		.pos = { .x = gx+c.x+c.w, .y = gy+c.y+c.h },
-		.uv  = { .u = c.u+c.w,    .v = c.v+c.h },
-	};
-	vtstack_push(&ren.font_stack, &v);
-	// x3,y3
-	v = (struct v_text){
-		.pos = { .x = gx+c.x+c.w, .y = gy+c.y },
-		.uv  = { .u = c.u+c.w,    .v = c.v },
-	};
-	vtstack_push(&ren.font_stack, &v);
-	// x1,y1
-	v = (struct v_text){
-		.pos = { .x = gx+c.x, .y = gy+c.y+c.h },
-		.uv  = { .u = c.u,    .v = c.v+c.h },
-	};
-	vtstack_push(&ren.font_stack, &v);
-	// x3,y3
-	v = (struct v_text){
-		.pos = { .x = gx+c.x+c.w, .y = gy+c.y },
-		.uv  = { .u = c.u+c.w,    .v = c.v },
-	};
-	vtstack_push(&ren.font_stack, &v);
-	// x4,y4
-	v = (struct v_text){
-		.pos = { .x = gx+c.x, .y = gy+c.y },
-		.uv  = { .u = c.u,    .v = c.v },
-	};
-	vtstack_push(&ren.font_stack, &v);
-
-	return 0;
-}
-
-
-static const struct font_glyph * get_glyph(unsigned int code, int idx)
-{
-	const struct font_glyph *g;
-	int updated;
-	g = font_get_glyph_texture(ren.fonts[idx].font, code, &updated);
-	if (!g)
-		REN_RET(NULL, REN_FONT);
-	if (updated) {
-		if (update_font_texture(idx))
-			REN_RET(NULL, REN_TEXTURE);
-	}
-	return g;
-}
-
-
-// TODO: reduce repeating patterns in ren_get_text_box() and ren_render_text()
-int ren_get_text_box(const char *str, int *rw, int *rh, int size)
-{
-	int w = 0, h = 0, x = 0, y = 0;
-	const struct font_glyph *g;
-	size_t off, ret;
-	uint32_t cp;
-	int idx = ren_get_font(size);
-	if (idx < 0)
-		return -1;
-
-	h = y = ren.fonts[idx].font->glyph_max_h;
-	for (off = 0; (ret = grapheme_decode_utf8(str+off, SIZE_MAX, &cp)) > 0 && cp != 0; off += ret) {
-		if (iscntrl(cp)) goto skip_get;
-		if (!(g = get_glyph(cp, idx)))
-			return -1;
-
-		x += g->x + g->a;
-		// FIXME: generalize this thing
-		skip_get:
-		switch (cp) {
-		case '\t': {
-			const struct font_glyph *sp = get_glyph(' ', idx);
-			if (!sp) return -1;
-			x += (sp->x + sp->a)*ren.tabsize;
-		}
-		break;
-		case '\r':
-			x = 0;
-			break;
-		case '\n':
-			// TODO: encode and/or store line height
-			y += ren.fonts[idx].font->glyph_max_h;
-			x = 0;
-			break;
-		default: break;
-		}
-
-		if (x > w) w = x;
-		if (y > h) h = y;
-	}
-
-	if (rw) *rw = w;
-	if (rh) *rh = h;
-
-	return 0;
-}
-
-
-int ren_render_text(const char *str, int x, int y, int w, int h, int size)
-{
-	const struct font_glyph *g;
-	size_t ret, off;
-	uint32_t cp;
-	int gx = x, gy = y;
-	int idx = ren_get_font(size);
-	if (idx < 0)
-		return -1;
-	for (off = 0; (ret = grapheme_decode_utf8(str+off, SIZE_MAX, &cp)) > 0 && cp != 0; off += ret) {
-		// skip special characters that render a box (not present in font)
-		if (iscntrl(cp)) goto skip_render;
-		if (!(g = get_glyph(cp, idx)))
-			return -1;
-
-		// only push the glyph if it is inside the bounding box
-		if (gx <= x+w && gy <= y+h)
-			ren_push_glyph(g, gx, gy);
-		// TODO: possible kerning needs to be applied here
-		// TODO: handle other unicode control characters such as the
-		//       right-to-left isolate (\u2067)
-		gx += g->x + g->a;
-		skip_render:
-		switch (cp) {
-		case '\t': {
-			const struct font_glyph *sp = get_glyph(' ', idx);
-			if (!sp) return -1;
-			gx += (sp->x + sp->a)*ren.tabsize;
-		}
-		break;
-		case '\r':
-			gx = x;
-			break;
-		case '\n':
-			gy += ren.fonts[idx].font->glyph_max_h;
-			gx = x;
-			break;
-		default: break;
-		}
-	}
-
-	ren_set_scissor(x, y, w, h);
-	ren_draw_font_stack(idx);
-
-	return 0;
-}
-
-
-// re-normalize color from 0-255 to 0-0x7fffffff, technically i'm dividing by 256 here
-#define RENORM(x) (((unsigned long long)(x)*0x7fffffff)>>8)
-#define R(x) (x&0xff)
-#define G(x) ((x>>8)&0xff)
-#define B(x) ((x>>16)&0xff)
-#define A(x) ((x>>24)&0xff)
-static int ren_push_box(int x, int y, int w, int h, unsigned int color)
-{
-	/* x4,y4        x3,y3
-	 * o-------------+
-	 * |(x,y)       /|
-	 * |          /  |
-	 * |   2    /    |
-	 * |      /      |
-	 * |    /        |
-	 * |  /     1    |
-	 * |/            |
-	 * +-------------+
-	 * x1,y1        x2,y2 */
-	struct v_col v;
-	vec4_i c = {
-		.r = RENORM(R(color)),
-		.g = RENORM(G(color)),
-		.b = RENORM(B(color)),
-		.a = RENORM(A(color)),
-	};
-	// x1, y1
-	v = (struct v_col){ .pos = { .x = x, .y = y+h }, .col = c };
-	vcstack_push(&ren.box_stack, &v);
-	// x2, y2
-	v = (struct v_col){ .pos = { .x = x+w, .y = y+h }, .col = c };
-	vcstack_push(&ren.box_stack, &v);
-	// x3, y3
-	v = (struct v_col){ .pos = { .x = x+w, .y = y }, .col = c };
-	vcstack_push(&ren.box_stack, &v);
-	// x1, y1
-	v = (struct v_col){ .pos = { .x = x, .y = y+h }, .col = c };
-	vcstack_push(&ren.box_stack, &v);
-	// x3, y3
-	v = (struct v_col){ .pos = { .x = x+w, .y = y }, .col = c };
-	vcstack_push(&ren.box_stack, &v);
-	// x4, y4
-	v = (struct v_col){ .pos = { .x = x, .y = y }, .col = c };
-	vcstack_push(&ren.box_stack, &v);
-
-	return 0;
-}
-
-
-int ren_render_box(int x, int y, int w, int h, unsigned int color)
-{
-	ren_push_box(x, y, w, h, color);
-	ren_draw_box_stack();
-	return 0;
-}
-
-
-int ren_free(void)
-{
-	GL(glUseProgram(0))
-	GL(glBindBuffer(GL_ARRAY_BUFFER, 0))
-	GL(glDeleteProgram(ren.box_prog));
-	GL(glDeleteProgram(ren.font_prog));
-	GL(glDeleteBuffers(1, &ren.font_buffer))
-	for (int i = 0; i < ren.fonts_no; i++) {
-		GL(glDeleteTextures(1, &ren.fonts[i].texture))
-		font_free(ren.fonts[i].font);
-	}
-	SDL_GL_DeleteContext(ren.gl);
-	vtstack_free(&ren.font_stack);
-	vcstack_free(&ren.box_stack);
-	return 0;
-}

text_rendering/ren.h

@@ -1,54 +0,0 @@
-#ifndef _RENDERER_H
-#define _RENDERER_H
-
-#include <SDL2/SDL.h>
-
-
-#define DEFAULT_FONT   "/usr/share/fonts/TTF/FiraCode-Regular.ttf"
-#define FONT_VERSHADER "./font_vertshader.glsl"
-#define FONT_FRAGSHADER "./font_fragshader.glsl"
-#define BOX_VERSHADER "./box_vertshader.glsl"
-#define BOX_FRAGSHADER "./box_fragshader.glsl"
-#define REN_VERTEX_IDX 0
-#define REN_UV_IDX     1
-#define REN_COLOR_IDX  2
-#define REN_TABSIZE    8
-
-
-typedef struct {
-	union { int x, u; };
-	union { int y, v; };
-} vec2_i;
-
-typedef struct {
-	union { int x, r; };
-	union { int y, g; };
-	union { int z, b; };
-	union { int w, a; };
-} vec4_i;
-
-// textured vertex
-struct v_text {
-	vec2_i pos;
-	vec2_i uv;
-};
-
-// colored vertex
-struct v_col {
-	vec2_i pos;
-	vec4_i col;
-};
-
-
-int ren_init(SDL_Window *sdl_window);
-int ren_free(void);
-const char * ren_strerror(void);
-int ren_update_viewport(int w, int h);
-int ren_set_scissor(int x, int y, int w, int h);
-int ren_get_text_box(const char *str, int *rw, int *rh, int size);
-int ren_render_text(const char *str, int x, int y, int w, int h, int size);
-int ren_render_box(int x, int y, int w, int h, unsigned int color);
-int ren_clear(void);
-
-
-#endif

text_rendering/util.c

@@ -1,126 +0,0 @@
-#define _POSIX_C_SOURCE 200809l
-
-#include <sys/mman.h>
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#include <err.h>
-#include <time.h>
-
-#include "util.h"
-
-
-const char *bit_rep[16] = {
-    [ 0] = "0000", [ 1] = "0001", [ 2] = "0010", [ 3] = "0011",
-    [ 4] = "0100", [ 5] = "0101", [ 6] = "0110", [ 7] = "0111",
-    [ 8] = "1000", [ 9] = "1001", [10] = "1010", [11] = "1011",
-    [12] = "1100", [13] = "1101", [14] = "1110", [15] = "1111",
-};
-
-
-
-void * emalloc(unsigned long int size)
-{
-	void *r = malloc(size);
-	if (!r)
-		err(EXIT_FAILURE, "malloc() of size %ld", size);
-	return r;
-}
-
-
-void * ecalloc(unsigned long int nmemb, unsigned long int size)
-{
-	void *r = calloc(nmemb, size);
-	if (!r)
-		err(EXIT_FAILURE, "calloc() of size %ld, nmemb %ld", size, nmemb);
-	return r;
-}
-
-void * erealloc(void *ptr, unsigned long int size)
-{
-	void *r = realloc(ptr, size);
-	if (!r)
-		err(EXIT_FAILURE, "ralloc() of 0x%lx, to size %ld", (unsigned long)ptr, size);
-	return r;
-}
-
-
-void efree(void *ptr)
-{
-	if (ptr)
-		free(ptr);
-}
-
-
-void map_file(const unsigned char **str, int *size, const char *path)
-{
-	if (!path) {
-		errno = EINVAL;
-		err(EXIT_FAILURE, "NULL filename");
-	}
-	FILE *fp = fopen(path, "r");
-	if (!fp)
-		err(EXIT_FAILURE, "Cannot open file %s", path);
-	*size = lseek(fileno(fp), 0, SEEK_END);
-	if (*size == (off_t)-1)
-		err(EXIT_FAILURE, "lseek() failed");
-	*str = mmap(0, *size, PROT_READ, MAP_PRIVATE, fileno(fp), 0);
-	if (*str == (void*)-1)
-		err(EXIT_FAILURE, "mmap() failed");
-	if (fclose(fp))
-		err(EXIT_FAILURE, "Error closing file");
-}
-
-
-void dump_file(const char *path, char **buf, int *buf_len)
-{
-	if (!path) {
-		errno = EINVAL;
-		err(EXIT_FAILURE, "NULL filename");
-	}
-	if (!buf) {
-		errno = EINVAL;
-		err(EXIT_FAILURE, "No buffer specified");
-	}
-	int m = 0;
-	if (!buf_len)
-		buf_len = &m;
-	FILE *fp = fopen(path, "r");
-	if (!fp)
-		err(EXIT_FAILURE, "Cannot open file %s", path);
-	*buf_len = lseek(fileno(fp), 0, SEEK_END);
-	rewind(fp);
-	if (*buf_len == (off_t)-1)
-		err(EXIT_FAILURE, "lseek() failed");
-	*buf = emalloc(*buf_len+1);
-	memset(*buf, 0, *buf_len+1);
-	int ret = fread(*buf, 1, *buf_len, fp);
-	if (ret != *buf_len)
-		err(EXIT_FAILURE, "fread() returned short %s", ferror(fp) ? "stream error" : feof(fp) ? "EOF reached" : "unknown error");
-	if (fclose(fp))
-		err(EXIT_FAILURE, "Error closing file");
-}
-
-
-void print_byte(unsigned char byte)
-{
-	printf("%s%s", bit_rep[byte >> 4], bit_rep[byte & 0x0F]);
-}
-
-
-static struct timespec clock_start, clock_stop;
-
-void stopwatch_start(void)
-{
-	clock_gettime(CLOCK_MONOTONIC_COARSE, &clock_start);
-}
-
-
-double stopwatch_get(void)
-{
-	clock_gettime(CLOCK_MONOTONIC_COARSE, &clock_stop);
-	return (clock_stop.tv_sec-clock_start.tv_sec)+(double)(clock_stop.tv_nsec-clock_start.tv_nsec)/(double)1000000000L;
-}

text_rendering/util.h

@@ -1,34 +0,0 @@
-#ifndef _UTIL_H
-#define _UTIL_H
-
-#include <stdio.h>
-
-
-void * emalloc(unsigned long int size);
-void * ecalloc(unsigned long int nmemb, unsigned long int size);
-void * erealloc(void *ptr, unsigned long int size);
-void efree(void *ptr);
-
-void map_file(const unsigned char **str, int *size, const char *path);
-void dump_file(const char *path, char **buf, int *buf_len);
-
-void print_byte(unsigned char byte);
-
-void stopwatch_start(void);
-double stopwatch_get(void);
-
-#define TIME_SEC(f)                                                            \
-{                                                                              \
-	stopwatch_start();                                                     \
-	f;                                                                     \
-	printf("\"%s\" took %f seconds", #f, stopwatch_get());                 \
-}
-
-#define TIME_MS(f)                                                             \
-{                                                                              \
-	stopwatch_start();                                                     \
-	f;                                                                     \
-	printf("\"%s\" took %f ms", #f, stopwatch_get()*1000.0f);              \
-}
-
-#endif

ugui.h

@@ -1,285 +0,0 @@
-#ifndef _UG_HEADER
-#define _UG_HEADER
-
-#define UG_STACK(T)    struct { T *items; int idx, size, sorted; }
-#define BIT(n)         (1 << n)
-#define RGBA_FORMAT(x) { .a=x&0xff, .b=(x>>8)&0xff, .g=(x>>16)&0xff, .r=(x>>24)&0xff }
-#define RGB_FORMAT(x)  { .a=0xff, .b=x&0xff, .g=(x>>8)&0xff, .r=(x>>16)&0xff }
-#define SIZE_PX(x)     { .size.i=x, .unit=UG_UNIT_PX }
-#define SIZE_MM(x)     { .size.f=x, .unit=UG_UNIT_MM }
-#define SIZE_PT(x)     { .size.f=x, .unit=UG_UNIT_PT }
-#define SQUARE(x)      .w = x, .h = x
-
-// basic types
-typedef unsigned int                                       ug_id_t;
-typedef struct { union {int x, w;}; union {int y, h;}; }   ug_vec2_t;
-typedef struct { unsigned char a, b, g, r; }               ug_color_t;
-typedef struct { int x, y, w, h; }                         ug_rect_t;
-typedef struct { union {int i; float f;} size; int unit; } ug_size_t;
-// div has information about the phisical dimension
-typedef struct { ug_size_t x, y, w, h;}                    ug_div_t;
-
-typedef enum {
-	UG_UNIT_PX = 0,
-	UG_UNIT_MM,
-	UG_UNIT_PT,
-} ug_unit_t;
-
-
-// element type
-typedef struct {
-	ug_id_t id;
-	unsigned short int type;
-	unsigned short int flags;
-	ug_rect_t rect, rca;
-	const char *name;
-	union {
-		struct {
-			const char *txt;
-		} btn;
-	};
-} ug_element_t;
-
-enum {
-	UG_ELEM_BUTTON,    // button
-	UG_ELEM_TXTBTN,    // textual button, a button but without frame
-	UG_ELEM_CHECK,     // checkbox
-	UG_ELEM_RADIO,     // radio button
-	UG_ELEM_TOGGLE,    // toggle button
-	UG_ELEM_LABEL,     // simple text
-	UG_ELEM_UPDOWN,    // text with two buttons up and down
-	UG_ELEM_TEXTINPUT, // text input box
-	UG_ELEM_TEXTBOX,   // text surrounded by a box
-	UG_ELEM_IMG,       // image, icon
-	UG_ELEM_SPACE,     // takes up space
-};
-
-enum {
-	ELEM_CLIPPED = BIT(0),
-};
-
-
-// container type, a container is an entity that contains layouts, a container has
-// a haight a width and their maximum values, in essence a container is a rectangular
-// area that can be resized and sits somewhere on the drawable region
-// the z index of a container is determined by it's position on the stack
-typedef struct {
-	ug_id_t id;
-	const char *name;
-	ug_rect_t rect;
-	// absolute position rect
-	ug_rect_t rca;
-	unsigned int flags;
-	// layouting and elements
-	// total space used by elements, x and y are the starting coordinates
-	// for elements
-	ug_rect_t space;
-	// origin for in-row and in-column elements
-	ug_vec2_t c_orig, r_orig;
-	UG_STACK(ug_element_t) elem_stack;
-	ug_id_t selected_elem, hover_elem;
-} ug_container_t;
-
-// the container flags
-enum {
-	UG_CNT_FLOATING      = BIT(0), // is on top of everything else
-	UG_CNT_RESIZE_RIGHT  = BIT(1), // can be resized from the right border
-	UG_CNT_RESIZE_BOTTOM = BIT(2), // can be resized from the bottom border
-	UG_CNT_RESIZE_LEFT   = BIT(3), // can be resized from the left border
-	UG_CNT_RESIZE_TOP    = BIT(4), // can be resized from the top border
-	UG_CNT_SCROLL_X      = BIT(5), // can have horizontal scrolling
-	UG_CNT_SCROLL_Y      = BIT(6), // can have vertical scrolling
-	UG_CNT_MOVABLE       = BIT(7), // can be moved around
-	// container state
-	CNT_STATE_NONE       = BIT(30),
-	CNT_STATE_MOVING     = BIT(29),
-	CNT_STATE_RESIZE_T   = BIT(28),
-	CNT_STATE_RESIZE_B   = BIT(27),
-	CNT_STATE_RESIZE_L   = BIT(26),
-	CNT_STATE_RESIZE_R   = BIT(25),
-	CNT_STATE_RESIZE_D   = BIT(24),
-	CNT_STATE_DELETE     = BIT(23), // The container is marked for removal
-	// layouting
-	CNT_LAYOUT_COLUMN    = BIT(22),
-};
-
-// style, defines default height, width, color, margins, borders, etc
-// all dimensions should be taken as a reference when doing the layout since
-// ultimately it's the layout that decides them. For example when deciding how to
-// allocate space one can say that the default size of a region that allocates a
-// slider has the style's default dimensions for a slider
-typedef struct {
-	struct { ug_color_t bg, fg; } color;
-	ug_size_t margin;
-	struct {
-		ug_color_t color;
-		ug_size_t  size;
-	} border;
-	struct {
-		struct { ug_color_t bg, fg; } color;
-		ug_size_t  height, font_size;
-	} title;
-	struct {
-		struct { ug_color_t act, bg, fg, sel, br; } color;
-		ug_size_t font_size, border;
-	} btn;
-} ug_style_t;
-
-
-// render commands
-struct ug_cmd_rect { int x, y, w, h; ug_color_t color; };
-struct ug_cmd_text { int x, y, size; ug_color_t color; const char *str; };
-
-typedef struct {
-	unsigned int type;
-	union {
-		struct ug_cmd_rect rect;
-		struct ug_cmd_text text;
-	};
-} ug_cmd_t;
-
-typedef enum {
-	UG_CMD_NULL = 0,
-	UG_CMD_RECT,
-	UG_CMD_TEXT,
-} ug_cmd_type_t;
-
-// window side
-enum {
-	UG_SIDE_TOP = 0,
-	UG_SIDE_BOTTOM,
-	UG_SIDE_LEFT,
-	UG_SIDE_RIGHT,
-};
-
-// mouse buttons
-enum {
-	UG_BTN_LEFT   = BIT(0),
-	UG_BTN_MIDDLE = BIT(1),
-	UG_BTN_RIGHT  = BIT(2),
-	UG_BTN_4      = BIT(3),
-	UG_BTN_5      = BIT(4),
-};
-
-// context
-typedef struct {
-	// some style information
-	const ug_style_t *style;
-	// style_px is a style cache where all measurements are already in pixels
-	const ug_style_t *style_px;
-	// ppi: pixels per inch
-	// ppm: pixels per millimeter
-	// ppd: pixels per dot
-	float ppi, ppm, ppd;
-	float last_ppi, last_ppm, last_ppd;
-	// containers need to know how big the "main container" is so that all
-	// the relative positioning work
-	ug_vec2_t size;
-	ug_rect_t origin;
-	// which context and element we are hovering
-	ug_id_t hover_cnt;
-	// active is updated on mousedown and released on mouseup
-	// the id of the "active" element, active means different things for
-	// different elements, for exaple active for a button means to be pressed,
-	// and for a text box it means to be focused
-	ug_id_t active_cnt, last_active_cnt;
-	// id of the selected container, used for layout
-	// NOTE: since the stacks can be relocated with realloc it is better not
-	//       to use a pointer here, even tough it would be better for efficiency
-	ug_id_t selected_cnt;
-	// count the frames for fun
-	unsigned long int frame;
-	// mouse data
-	struct {
-		ug_vec2_t pos;
-		ug_vec2_t last_pos;
-		ug_vec2_t delta;
-		ug_vec2_t scroll_delta;
-		// mouse.update: a mask of the mouse buttons that are being updated
-		unsigned char update;
-		// mouse.hold: a mask of the buttons that are being held
-		unsigned char hold;
-	} mouse;
-	// keyboard key pressed
-	struct {
-		unsigned char update;
-		unsigned char hold;
-	} key;
-	// input text buffer
-	char input_text[32];
-	// stacks
-	UG_STACK(ug_container_t) cnt_stack;
-	UG_STACK(ug_cmd_t) cmd_stack;
-	// command stack iterator
-	int cmd_it;
-} ug_ctx_t;
-
-
-// context initialization
-ug_ctx_t * ug_ctx_new(void);
-void ug_ctx_free(ug_ctx_t *ctx);
-// updates the context with user information
-// ppi: pixels per inch, the scale used for all em/mm to pixel calculations
-// scale: it is the scale between the physical pixels on the screen and the pixels
-//        on the buffer, if unsure set to 1.0
-int ug_ctx_set_displayinfo(ug_ctx_t *ctx, float scale, float ppi);
-int ug_ctx_set_drawableregion(ug_ctx_t *ctx, ug_vec2_t size);
-int ug_ctx_set_style(ug_ctx_t *ctx, const ug_style_t *style);
-
-
-// define containers, name is used as a salt for the container id, all sizes are
-// the default ones, resizing is done automagically with internal state
-
-// a floating container can be placed anywhere and can be resized, acts like a
-// window inside another window
-int ug_container_floating(ug_ctx_t *ctx, const char *name, ug_div_t div);
-// like a floating container but cannot be resized
-int ug_container_popup(ug_ctx_t *ctx, const char *name, ug_div_t div);
-// a menu bar is a container of fixed height, cannot be resized and sits at the
-// top of the window
-int ug_container_menu_bar(ug_ctx_t *ctx, const char *name, ug_size_t height);
-// a sidebar is a variable size container anchored to one side of the window
-int ug_container_sidebar(ug_ctx_t *ctx, const char *name, ug_size_t size, int side);
-// a body is a container that scales with the window, sits at it's center and cannot
-// be resized, it also fills all the available space
-int ug_container_body(ug_ctx_t *ctx, const char *name);
-// mark a conatiner for removal, it will be freed at the next frame beginning if
-// name is NULL then use the selected container
-int ug_container_remove(ug_ctx_t *ctx, const char *name);
-// get the drawable area of the container, if name is NULL then use the selected
-// container
-ug_rect_t ug_container_get_rect(ug_ctx_t *ctx, const char *name);
-
-// layouting, the following functions define how different ui elements are placed
-// inside the selected container. A new element is aligned respective to the
-// previous element and/or to the container, particularly elements can be placed
-// in a row or a column.
-int ug_layout_row(ug_ctx_t *ctx);
-int ug_layout_column(ug_ctx_t *ctx);
-int ug_layout_next_row(ug_ctx_t *ctx);
-int ug_layout_next_column(ug_ctx_t *ctx);
-
-// elements
-int ug_element_button(ug_ctx_t *ctx, const char *name, const char *txt, ug_div_t dim);
-int ug_element_textbtn(ug_ctx_t *ctx, const char *name, const char *txt, ug_div_t dim);
-
-// Input functions
-int ug_input_mousemove(ug_ctx_t *ctx, int x, int y);
-int ug_input_mousedown(ug_ctx_t *ctx, unsigned int mask);
-int ug_input_mouseup(ug_ctx_t *ctx, unsigned int mask);
-int ug_input_scroll(ug_ctx_t *ctx, int x, int y);
-// TODO: other input functions
-
-// Frame handling
-int ug_frame_begin(ug_ctx_t *ctx);
-int ug_frame_end(ug_ctx_t *ctx);
-
-// Commands
-// get the next command, save iteration state inside 'iterator'
-ug_cmd_t * ug_cmd_next(ug_ctx_t *ctx);
-
-
-#undef UG_STACK
-#undef BIT
-
-#endif