less than bare minimum

Makefile

@@ -7,8 +7,10 @@ all: ugui
 raylib/src/libraylib.a: raylib/src/Makefile
 	cd raylib/src; $(MAKE) PLATFORM=PLATFORM_DESKTOP
 
-ugui: ugui.o vectree.o raylib/src/libraylib.a
+ugui: ugui.o vectree.o cache.o raylib/src/libraylib.a
 
 ugui.o: ugui.c ugui.h
 
 vectree.o: vectree.c ugui.h
+
+cache.o: cache.c ugui.h

cache.c

@@ -24,13 +24,13 @@
 
 #define HASH_MAXSIZE 4096
 
-// hash table (id -> index)
+// hash table (id -> cache index)
 typedef struct {
-	uint32_t id;
+	UgId id;
 	uint32_t index;
 } IdElem;
 
-typedef struct {
+typedef struct _IdTable {
 	uint32_t items, size, exp;
 	IdElem   bucket[];
 } IdTable;
@@ -62,7 +62,7 @@ void table_destroy(IdTable *ht)
 }
 
 // Find and return the element by pointer
-IdElem *table_search(IdTable *ht, uint32_t id)
+IdElem *table_search(IdTable *ht, UgId id)
 {
 	if (!ht) {
 		return NULL;
@@ -93,7 +93,7 @@ IdElem *table_insert(IdTable *ht, IdElem entry)
 	return r;
 }
 
-IdElem *table_remove(IdTable *ht, uint32_t id)
+IdElem *table_remove(IdTable *ht, UgId id)
 {
 	if (!ht) {
 		return NULL;
@@ -119,13 +119,6 @@ IdElem *table_remove(IdTable *ht, uint32_t id)
 		}                                                                   \
 	} while (0)
 
-typedef struct {
-	IdTable  *table;
-	UgElem   *array;
-	uint64_t *present, *used;
-	int       cycles;
-} UgElemCache;
-
 /* FIXME: check for allocation errors */
 UgElemCache ug_cache_init(void)
 {
@@ -148,7 +141,7 @@ void ug_cache_free(UgElemCache *cache)
 	}
 }
 
-const UgElem *ug_cache_search(UgElemCache *cache, uint32_t id)
+UgElem *ug_cache_search(UgElemCache *cache, UgId id)
 {
 	if (!cache) {
 		return NULL;
@@ -190,7 +183,7 @@ int ug_cache_get_free_spot(UgElemCache *cache)
 	return 0;
 }
 
-const UgElem *ug_cache_insert_at(UgElemCache *cache, const UgElem *g, uint32_t index)
+UgElem *ug_cache_insert_at(UgElemCache *cache, const UgElem *g, uint32_t index)
 {
 	if (!cache) {
 		return NULL;
@@ -211,7 +204,7 @@ const UgElem *ug_cache_insert_at(UgElemCache *cache, const UgElem *g, uint32_t i
 }
 
 // Insert an element in the cache
-const UgElem *ug_cache_insert(UgElemCache *cache, const UgElem *g, int32_t *index)
+UgElem *ug_cache_insert(UgElemCache *cache, const UgElem *g, uint32_t *index)
 {
 	*index = ug_cache_get_free_spot(cache);
 	return ug_cache_insert_at(cache, g, *index);

ugui.c

@@ -1,3 +1,5 @@
+#define _DEFAULT_SOURCE
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
@@ -6,30 +8,185 @@
 #include "raylib.h"
 #include "ugui.h"
 
+typedef struct _UgCmd {
+	enum {
+		CMD_RECT = 0,
+	} type;
+
+	union {
+		struct {
+			int32_t x, y, w, h;
+			uint8_t color[4]; // rgba, [0] = r
+		} rect;
+	};
+} UgCmd;
+
+typedef struct _UgStack {
+	int size, count;
+	UgCmd   *stack;
+} UgStack;
+
+int ug_stack_init(UgStack *stack, uint32_t size);
+int ug_stack_free(UgStack *stack);
+int ug_stack_push(UgStack *stack, UgCmd *cmd);
+int ug_stack_pop(UgStack *stack, UgCmd *cmd);
+
+int ug_stack_init(UgStack *stack, uint32_t size)
+{
+	if (stack == NULL) {
+		return -1;
+	}
+
+	stack->size  = size;
+	stack->count = 0;
+	stack->stack = calloc(size, sizeof(UgCmd));
+
+	if (stack->stack == NULL) {
+		return -1;
+	}
+
+	return 0;
+}
+
+int ug_stack_free(UgStack *stack)
+{
+	if (stack != NULL && stack->stack != NULL) {
+		free(stack->stack);
+		stack->size  = 0;
+		stack->count = 0;
+	}
+	return 0;
+}
+
+#define STACK_STEP 10
+
+int ug_stack_push(UgStack *stack, UgCmd *cmd)
+{
+	if (stack == NULL || cmd == NULL) {
+		return -1;
+	}
+
+	if (stack->count >= stack->size) {
+		//	UgCmd *tmp = reallocarray(stack->stack, stack->size +
+		// STACK_STEP, sizeof(UgCmd)); 	if (tmp == NULL) { return -1;
+		//	}
+		//	stack->stack = tmp;
+		//	stack->size += STACK_STEP;
+		return -1;
+	}
+
+	stack->stack[stack->count++] = *cmd;
+
+	return 0;
+}
+
+int ug_stack_pop(UgStack *stack, UgCmd *cmd)
+{
+	if (stack == NULL || cmd == NULL) {
+		return -1;
+	}
+
+	if (stack->count <= 0) {
+		//	UgCmd *tmp = reallocarray(stack->stack, stack->size +
+		// STACK_STEP, sizeof(UgCmd)); 	if (tmp == NULL) { return -1;
+		//	}
+		//	stack->stack = tmp;
+		//	stack->size += STACK_STEP;
+		return -1;
+	}
+
+	*cmd = stack->stack[--stack->count];
+
+	return 0;
+}
+
+struct _UgCtx {
+	enum {
+		row = 0,
+		column,
+		floating,
+	} layout;
+
+	UgTree      tree;
+	UgElemCache cache;
+	UgStack     stack;
+
+	struct {
+		int width, height;
+	} size;
+
+	int div_using; // tree node indicating the current active div
+};
+
+int  ug_div_begin(UgCtx *ctx, const char *name, UgRect div);
+int  ug_div_end(UgCtx *ctx);
+int  ug_input_window_size(UgCtx *ctx, int width, int height);
+UgId djb2(const char *str);
+
 int main(void)
 {
 	UgCtx ctx;
 	ug_init(&ctx);
 
-	InitWindow(800, 450, "Ugui Test");
+	int width = 800, height = 450;
+	SetConfigFlags(FLAG_WINDOW_RESIZABLE);
+	InitWindow(width, height, "Ugui Test");
+	ug_input_window_size(&ctx, width, height);
 
 	// Main loop
 	while (!WindowShouldClose()) {
-		ug_begin_frame(&ctx);
+
+		// UI handling
+		ug_frame_begin(&ctx);
+
+		if (IsWindowResized()) {
+			width  = GetScreenWidth();
+			height = GetScreenHeight();
+			ug_input_window_size(&ctx, width, height);
+		}
+
+// main div, fill the whole window
+#define DIV_FILL (UgRect) {.x = 0, .y = 0, .w = -1, .h = -1}
+		ug_div_begin(&ctx, "main", DIV_FILL);
+		ug_div_end(&ctx);
+
+		ug_frame_end(&ctx);
 
 		// drawing
 		BeginDrawing();
 		ClearBackground(BLACK);
-		DrawText(
-		    "Congrats! You created your first window!",
-		    190,
-		    200,
-		    20,
-		    LIGHTGRAY
+
+		Rectangle r;
+		Color     c;
+		for (UgCmd cmd; ug_stack_pop(&ctx.stack, &cmd) >= 0;) {
+			switch (cmd.type) {
+			case CMD_RECT:
+				printf(
+				    "rect x=%d y=%d w=%d h=%d\n",
+				    cmd.rect.x,
+				    cmd.rect.y,
+				    cmd.rect.w,
+				    cmd.rect.h
+				);
+				c = (Color) {
+				    .r = cmd.rect.color[0],
+				    .g = cmd.rect.color[1],
+				    .b = cmd.rect.color[2],
+				    .a = cmd.rect.color[3],
+				};
+				DrawRectangle(
+				    cmd.rect.x, cmd.rect.y, cmd.rect.w, cmd.rect.h, c
 				);
+				break;
+			default:
+				printf("Unknown cmd type: %d\n", cmd.type);
+				break;
+			}
+		}
+
 		EndDrawing();
 
-		ug_end_frame(&ctx);
+		WaitTime(0.2);
 	}
 
 	CloseWindow();
@@ -38,13 +195,21 @@ int main(void)
 	return 0;
 }
 
+#define MAX_ELEMS 128
+#define MAX_CMDS  256
+
 int ug_init(UgCtx *ctx)
 {
 	if (ctx == NULL) {
 		return -1;
 	}
 
-	ug_tree_init(&ctx->tree, 10);
+	ug_tree_init(&ctx->tree, MAX_ELEMS);
+	ug_stack_init(&ctx->stack, MAX_CMDS);
+
+	ctx->cache     = ug_cache_init();
+	ctx->layout    = row;
+	ctx->div_using = 0;
 
 	return 0;
 }
@@ -56,6 +221,106 @@ int ug_destroy(UgCtx *ctx)
 	}
 
 	ug_tree_destroy(&ctx->tree);
+	ug_cache_free(&ctx->cache);
+
+	return 0;
+}
+
+int ug_frame_begin(UgCtx *ctx) { return 0; }
+
+int ug_frame_end(UgCtx *ctx) { return 0; }
+
+int ug_input_window_size(UgCtx *ctx, int width, int height)
+{
+	if (ctx == NULL) {
+		return -1;
+	}
+
+	if (width <= 0 || height <= 0) {
+		return -1;
+	}
+
+	if (width >= 0) {
+		ctx->size.width = width;
+	}
+	if (height >= 0) {
+		ctx->size.height = height;
+	}
+
+	return 0;
+}
+
+UgId djb2(const char *str)
+{
+	uint64_t hash = 5381;
+	uint32_t c;
 
+	while ((c = (str++)[0]) != 0) {
+		hash = ((hash << 5) + hash) + c;
+	} /* hash * 33 + c */
+
+	return hash;
+}
+
+int ug_div_begin(UgCtx *ctx, const char *name, UgRect div)
+{
+	if (ctx == NULL || name == NULL) {
+		return -1;
+	}
+
+	UgId id = djb2(name);
+
+	// add the element if it does not exist
+	UgElem *c_elem = ug_cache_search(&ctx->cache, id);
+	if (c_elem == NULL) {
+		UgElem elem = {
+		    .id   = id,
+		    .type = ETYPE_DIV,
+		    .rec  = (UgRect) {
+			 .x = div.x,
+			 .y = div.y,
+			 .w = div.w >= 0 ? div.w : ctx->size.width,
+			 .h = div.h >= 0 ? div.h : ctx->size.height,
+                    }};
+		uint32_t c_idx;
+		c_elem = ug_cache_insert(&ctx->cache, &elem, &c_idx);
+	}
+
+	// FIXME: why save the id in the tree and not something more direct like
+	//        the element pointer or the index into the cache vector?
+	int div_node = ug_tree_add(&ctx->tree, c_elem->id, ctx->div_using);
+	if (div_node < 0) {
+		// do something
+		printf("Error adding to tree\n");
+	}
+	ctx->div_using = div_node;
+
+//	printf(
+//	    "elem.rect: x=%d x=%d w=%d h=%d\n",
+//	    c_elem->rec.x,
+//	    c_elem->rec.y,
+//	    c_elem->rec.w,
+//	    c_elem->rec.h
+//	);
+	UgCmd cmd = {
+	    .type = CMD_RECT,
+	    .rect =
+		{
+		    .x     = c_elem->rec.x,
+		    .y     = c_elem->rec.y,
+		    .w     = c_elem->rec.w,
+		    .h     = c_elem->rec.h,
+		    .color = {0xff, 0x00, 0x00, 0xff}, // red
+		},
+	};
+	ug_stack_push(&ctx->stack, &cmd);
+
+	return 0;
+}
+
+int ug_div_end(UgCtx *ctx)
+{
+	// the div_using returns to the parent of the current one
+	ctx->div_using = ug_tree_parentof(&ctx->tree, ctx->div_using);
 	return 0;
 }

ugui.h

@@ -15,16 +15,15 @@ typedef struct {
 	uint8_t r, g, b, a;
 } UgColor;
 
+typedef uint64_t UgId;
+
 typedef enum {
 	ETYPE_NONE = 0,
-	ETYPE_BUTTON,
-	ETYPE_TEXT,
-	ETYPE_SCROLL,
-	ETYPE_SLIDER,
+	ETYPE_DIV,
 } UgElemType;
 
 typedef struct {
-	uint64_t id;
+	UgId id;
 	UgRect rec;
 	union {
 		uint32_t type_int;
@@ -37,27 +36,42 @@ typedef struct {
 
 typedef struct {
 	int size, elements;
-	uint32_t *vector; // vector of element ids
+	UgId *vector; // vector of element ids
 	int *refs, *ordered_refs;
 } UgTree;
 
 typedef struct {
-	UgTree tree;
-} UgCtx;
+	struct _IdTable  *table;
+	UgElem   *array;
+	uint64_t *present, *used;
+	int       cycles;
+} UgElemCache;
+
+typedef struct _UgCtx UgCtx;
 
 // tree implementation
 int ug_tree_init(UgTree *tree, unsigned int size);
 int ug_tree_pack(UgTree *tree);
 int ug_tree_resize(UgTree *tree, unsigned int newsize);
-int ug_tree_add(UgTree *tree, uint32_t elem, int parent);
+int ug_tree_add(UgTree *tree, UgId elem, int parent);
 int ug_tree_prune(UgTree *tree, int ref);
 int ug_tree_subtree_size(UgTree *tree, int ref);
 int ug_tree_children_it(UgTree *tree, int parent, int *cursor);
 int ug_tree_level_order_it(UgTree *tree, int ref, int *cursor);
+int ug_tree_parentof(UgTree *tree, int node);
 int ug_tree_destroy(UgTree *tree);
 
+// cache implementation
+UgElemCache ug_cache_init(void);
+void ug_cache_free(UgElemCache *cache);
+UgElem *ug_cache_search(UgElemCache *cache, UgId id);
+UgElem *ug_cache_insert(UgElemCache *cache, const UgElem *g, uint32_t *index);
+
+
 int ug_init(UgCtx *ctx);
 int ug_destroy(UgCtx *ctx);
+int ug_frame_begin(UgCtx *ctx);
+int ug_frame_end(UgCtx *ctx);
 
 #endif // _UGUI_H
 

vectree.c

@@ -12,7 +12,7 @@ int ug_tree_init(UgTree *tree, unsigned int size)
 		return -1;
 	}
 
-	tree->vector = malloc(sizeof(UgElem) * size);
+	tree->vector = malloc(sizeof(UgId) * size);
 	if (tree->vector == NULL) {
 		return -1;
 	}
@@ -37,7 +37,7 @@ int ug_tree_init(UgTree *tree, unsigned int size)
 	}
 
 	// fill vector with zeroes
-	memset(tree->vector, 0, size * sizeof(UgElem));
+	memset(tree->vector, 0, size * sizeof(UgId));
 
 	tree->size     = size;
 	tree->elements = 0;
@@ -118,7 +118,7 @@ int ug_tree_resize(UgTree *tree, unsigned int newsize)
 		return -1;
 	}
 
-	uint32_t *newvec = realloc(tree->vector, newsize * sizeof(uint32_t));
+	UgId *newvec = realloc(tree->vector, newsize * sizeof(UgId));
 	if (newvec == NULL) {
 		return -1;
 	}
@@ -149,7 +149,7 @@ int ug_tree_resize(UgTree *tree, unsigned int newsize)
 }
 
 // add an element to the tree, return it's ref
-int ug_tree_add(UgTree *tree, uint32_t elem, int parent)
+int ug_tree_add(UgTree *tree, UgId elem, int parent)
 {
 	if (tree == NULL) {
 		return -1;
@@ -333,3 +333,12 @@ int ug_tree_level_order_it(UgTree *tree, int ref, int *cursor)
 
 	return -1;
 }
+
+int ug_tree_parentof(UgTree *tree, int node)
+{
+	if (tree == NULL || !IS_VALID_REF(tree, node) ||
+	    !REF_IS_PRESENT(tree, node)) {
+		return -1;
+	}
+	return tree->refs[node];
+}