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Alessandro Mauri 1 year ago
parent 0a18bfc951
commit 2ada5113a1
Signed by: alema
GPG Key ID: 2B7BF9531FF03BE8
3 changed files with 66 additions and 50 deletions
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  1. 23
      text_rendering/font.c
  2. 17
      text_rendering/main.c
  3. 76
      text_rendering/ren.c

23
text_rendering/font.c
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@ -107,8 +107,8 @@ int font_free(struct font_atlas *atlas)
// errors height and width must be equal
const struct font_glyph * font_get_glyph_texture(struct font_atlas *atlas, unsigned int code, int *updated)
{
int u = 0;
if (!updated) updated = &u;
int _u = 0;
if (!updated) updated = &_u;
const struct font_glyph *r;
if ((r = cache_search(&PRIV(atlas)->c, code)) != NULL) {
@ -120,7 +120,8 @@ const struct font_glyph * font_get_glyph_texture(struct font_atlas *atlas, unsig
// generate the sdf and put it into the cache
// TODO: generate the whole block at once
int idx = stbtt_FindGlyphIndex(&PRIV(atlas)->stb, code);
int x0,y0,x1,y1,gw,gh,l,off_x,off_y,adv;
int x0,y0,x1,y1,gw,gh,l,off_x,off_y,adv,base;
base = atlas->glyph_max_h - PRIV(atlas)->baseline;
stbtt_GetGlyphBitmapBoxSubpixel(
&PRIV(atlas)->stb,
idx,
@ -149,19 +150,19 @@ const struct font_glyph * font_get_glyph_texture(struct font_atlas *atlas, unsig
// TODO: bounds check usign atlas height
// TODO: clear spot area in the atlas before writing on it
unsigned int spot = cache_get(&PRIV(atlas)->c);
unsigned int oy = ((atlas->glyph_max_w * spot) / atlas->width) * atlas->glyph_max_h;
unsigned int ox = (atlas->glyph_max_w * spot) % atlas->width;
unsigned int ty = ((atlas->glyph_max_w * spot) / atlas->width) * atlas->glyph_max_h;
unsigned int tx = (atlas->glyph_max_w * spot) % atlas->width;
unsigned int w = atlas->width;
unsigned char *a = (void *)atlas->atlas;
//printf("max:%d %d spot:%d : %d %d %d %d\n", atlas->glyph_max_w, atlas->glyph_max_h, spot, ox, oy, off_x, off_y);
//printf("max:%d %d spot:%d : %d %d %d %d\n", atlas->glyph_max_w, atlas->glyph_max_h, spot, tx, ty, off_x, off_y);
for (int y = 0; y < gh; y++) {
for (int x = 0; x < gw; x++) {
int c, r;
r = (oy+y)*w;
c = ox+x;
r = (ty+y)*w;
c = tx+x;
a[r+c] = PRIV(atlas)->bitmap[y*atlas->glyph_max_w+x];
}
}
@ -169,12 +170,12 @@ const struct font_glyph * font_get_glyph_texture(struct font_atlas *atlas, unsig
// FIXME: get the advance
struct font_glyph g = {
.codepoint = code,
.u = ox,
.v = oy,
.u = tx,
.v = ty,
.w = gw,
.h = gh,
.x = off_x,
.y = off_y,
.y = off_y-base,
.a = adv,
};
return cache_insert(&PRIV(atlas)->c, &g, g.codepoint, spot);

17
text_rendering/main.c
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@ -8,7 +8,9 @@
#include "util.h"
const char *str = "Ciao Mamma!\nprova: òçà°ù§|¬³¼$£ì\t";
//const char *str1 = "Ciao Mamma!\nprova: òçà°ù§|¬³¼$£ì\t";
const char *str1 = "j";
const char *str2 = "gmt";
SDL_Window *win;
@ -17,10 +19,14 @@ void draw(void)
static unsigned int frame = 0;
printf("frame: %d\n", frame++);
ren_clear();
if (ren_render_text(str, 10, 10, 100, 50, 20))
ren_render_box(10, 10, 100, 50, 0xffff0000);
if (ren_render_text(str1, 10, 10, 100, 50, 20))
printf("text: %s\n", ren_strerror());
ren_render_text("altro font", 200, 40, 300, 300, 40);
ren_render_box(100, 300, 50, 50, 0xffff0000);
int w, h;
ren_get_text_box(str2, &w, &h, 40);
printf("box for: %s -> (%d, %d)\n", str2, w, h);
ren_render_box(200, 40, w, h, 0xffff0000);
ren_render_text(str2, 200, 40, 300, 300, 40);
SDL_GL_SwapWindow(win);
}
@ -30,6 +36,7 @@ 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");
SDL_SetHint(SDL_HINT_VIDEO_HIGHDPI_DISABLED, "0");
win = SDL_CreateWindow(
"test render",
@ -37,7 +44,7 @@ int main(void)
SDL_WINDOWPOS_UNDEFINED,
500,
500,
SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
if (ren_init(win)) {
printf("renderer init error: %s\n", ren_strerror());
return 1;

76
text_rendering/ren.c
Unescape View File

@ -1,7 +1,6 @@
#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>
@ -19,6 +18,7 @@
__FILE__, __LINE__, __func__, x, a, glerr[a]); \
}
#define GL(f) f; GLERR(#f)
#define REN_RET(a,b) {ren_errno = b; return a;}
enum REN_ERR {
@ -101,29 +101,29 @@ static int ren_errno;
// print shader compilation errors
static int shader_compile_error(GLuint shader)
static int shader_compile_error(GLuint shader, const char *path)
{
GLint status;
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
GL(glGetShaderiv(shader, GL_COMPILE_STATUS, &status))
if (status != GL_FALSE)
return 0;
GLint log_length;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_length);
GL(glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_length))
GLchar *log_str = emalloc((log_length + 1)*sizeof(GLchar));
glGetShaderInfoLog(shader, log_length, NULL, log_str);
GL(glGetShaderInfoLog(shader, log_length, NULL, log_str))
const char *shader_type_str = NULL;
GLint shader_type;
glGetShaderiv(shader, GL_SHADER_TYPE, &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:\n%s\n", shader_type_str, log_str);
fprintf(stderr, "Compile failure in %s shader %s:\n%s\n", shader_type_str, path, log_str);
efree(log_str);
return -1;
}
@ -133,15 +133,15 @@ static int shader_compile_error(GLuint shader)
static int shader_link_error(GLuint prog)
{
GLint status;
glGetProgramiv (prog, GL_LINK_STATUS, &status);
GL(glGetProgramiv(prog, GL_LINK_STATUS, &status))
if (status != GL_FALSE)
return 0;
GLint log_length;
glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &log_length);
GL(glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &log_length))
GLchar *log_str = emalloc((log_length + 1)*sizeof(GLchar));
glGetProgramInfoLog(prog, log_length, NULL, log_str);
GL(glGetProgramInfoLog(prog, log_length, NULL, log_str))
fprintf(stderr, "Linker failure: %s\n", log_str);
efree(log_str);
@ -149,8 +149,7 @@ static int shader_link_error(GLuint prog)
}
#define REN_RET(a,b) {ren_errno = b; return a;}
static GLuint shader_compile(const char *shader, GLuint type)
static GLuint shader_compile(const char *path, const char *shader, GLuint type)
{
GLuint s;
// initialize the vertex shader and get the corresponding id
@ -159,7 +158,7 @@ static GLuint shader_compile(const char *shader, GLuint type)
// get the shader into opengl
GL(glShaderSource(s, 1, &shader, NULL))
GL(glCompileShader(s))
if (shader_compile_error(s))
if (shader_compile_error(s, path))
REN_RET(0, REN_COMPILE)
return s;
}
@ -184,14 +183,14 @@ static GLuint ren_compile_program(const char *vs_path, const char *fs_path)
dump_file(vs_path, &str, NULL);
if (!str) REN_RET(0, REN_ERRNO)
gl_vertshader = shader_compile(str, GL_VERTEX_SHADER);
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(str, GL_FRAGMENT_SHADER);
gl_fragshader = shader_compile(fs_path, str, GL_FRAGMENT_SHADER);
efree(str);
if (!gl_fragshader)
return 0;
@ -218,6 +217,15 @@ static GLuint ren_compile_program(const char *vs_path, const char *fs_path)
}
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;
@ -231,24 +239,12 @@ static GLuint ren_texturergb_2d(const char *buf, int w, int h, int upscale, int
GL(glBindTexture(GL_TEXTURE_2D, t))
GL(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, buf))
GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT))
GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT))
GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, downscale))
GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, upscale))
set_texture_parameters(GL_TEXTURE_2D, GL_REPEAT, GL_REPEAT, upscale, downscale);
return t;
}
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_texturergba_2d(const char *buf, int w, int h, int upscale, int downscale)
{
GLuint t;
@ -374,17 +370,27 @@ 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
// TODO: make the switch to opengl 3.3 to go with the shader versions
//SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
ren.gl = SDL_GL_CreateContext(w);
if (!ren.gl)
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))
// GL(glEnable(GL_TEXTURE_2D))
// GL(glEnable(GL_TEXTURE_RECTANGLE))
GLenum glew_err = glewInit();
if (glew_err != GLEW_OK)
@ -492,6 +498,7 @@ static int ren_draw_font_stack(int 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);
@ -576,7 +583,7 @@ int ren_set_scissor(int x, int y, int w, int h)
static int ren_push_glyph(const struct font_glyph *g, int gx, int gy)
{
/* x4,y4 x3,y3
* +-------------+
* o-------------+
* |(x,y) /|
* | / |
* | 2 / |
@ -589,7 +596,7 @@ static int ren_push_glyph(const struct font_glyph *g, int gx, int gy)
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("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){
@ -643,6 +650,7 @@ int ren_get_text_box(const char *str, int *rw, int *rh, int 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;
g = font_get_glyph_texture(ren.fonts[idx].font, cp, &updated);
@ -736,7 +744,7 @@ int ren_render_text(const char *str, int x, int y, int w, int h, int size)
static int ren_push_box(int x, int y, int w, int h, unsigned int color)
{
/* x4,y4 x3,y3
* +-------------+
* o-------------+
* |(x,y) /|
* | / |
* | 2 / |

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