Add basic implementation for bitmap font

CMakeLists.txt

@@ -27,6 +27,7 @@ add_library(${PROJECT_NAME} SHARED
 	src/Renderer.c
 	src/ObjectStore.c
 	src/AssetManager.c
+	src/BitmapFont.c
 	src/reusable_ids.c
 	src/math_utils.c
 )
@@ -47,16 +48,17 @@ target_link_libraries(${PROJECT_NAME} PUBLIC
 )
 
 install(FILES
-		${CMAKE_CURRENT_BINARY_DIR}/engine_build_config.h
-		include/aliases.h
-		include/constants.h
-		include/GameEngine.h
-		include/Window.h
-		include/Renderer.h
-		include/ObjectStore.h
-		include/AssetManager.h
-		include/reusable_ids.h
-		include/math_utils.h
+	${CMAKE_CURRENT_BINARY_DIR}/engine_build_config.h
+	include/aliases.h
+	include/constants.h
+	include/GameEngine.h
+	include/Window.h
+	include/Renderer.h
+	include/ObjectStore.h
+	include/AssetManager.h
+	include/BitmapFont.h
+	include/reusable_ids.h
+	include/math_utils.h
 	CONFIGURATIONS Release
 	DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )

include/BitmapFont.h

@@ -0,0 +1,25 @@
+#ifndef BITMAP_FONT_H
+#define BITMAP_FONT_H
+
+#include "AssetManager.h"
+#include "Renderer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif // !__cplusplus
+
+typedef struct bitmap_font BitmapFont;
+
+BitmapFont *load_bitmap_font(AssetManager *am, const Renderer *renderer,
+                             const char *filepath, u64 tile_width,
+                             u64 tile_height);
+
+RenderRect get_character_sprite(BitmapFont *font, u64 index);
+
+void unload_bitmap_font(AssetManager *am, BitmapFont **font);
+
+#ifdef __cplusplus
+}
+#endif // !__cplusplus
+
+#endif // !BITMAP_FONT_H

src/BitmapFont.c

@@ -0,0 +1,83 @@
+#include "BitmapFont.h"
+#include "AssetManager.h"
+#include "Renderer.h"
+#include "SDL_render.h"
+#include "aliases.h"
+#include "reusable_ids.h"
+#include <stdlib.h>
+
+struct bitmap_font {
+  AssetID font_atlas;
+  u64 width;
+  u64 height;
+  u64 tile_width;
+  u64 tile_height;
+  u64 rows;
+  u64 cols;
+};
+
+BitmapFont *load_bitmap_font(AssetManager *am, const Renderer *renderer,
+                             const char *filepath, u64 tile_width,
+                             u64 tile_height) {
+  BitmapFont *font = (BitmapFont *)malloc(sizeof(BitmapFont));
+  if (!font) {
+    return NULL;
+  }
+
+  font->font_atlas =
+      load_asset_to_manager(am, filepath, ASSET_TYPE_IMAGE, renderer);
+
+  if (font->font_atlas == INVALID_ID) {
+    unload_bitmap_font(am, &font);
+
+    return NULL;
+  }
+
+  SDL_Texture *texture = get_texture(am, font->font_atlas);
+
+  i32 w;
+  i32 h;
+
+  if (SDL_QueryTexture(texture, NULL, NULL, &w, &h) != 0) {
+    unload_bitmap_font(am, &font);
+
+    return NULL;
+  }
+
+  font->width = w;
+  font->height = h;
+
+  font->tile_width = tile_width;
+  font->tile_height = tile_height;
+
+  font->rows = font->height / font->tile_height;
+  font->cols = font->width / font->tile_width;
+
+  return font;
+}
+
+RenderRect get_character_sprite(BitmapFont *font, u64 index) {
+  u64 col = index % font->cols;
+  u64 row = index / font->cols;
+
+  RenderRect rect = {
+      .x = col * font->tile_width,
+      .y = row * font->tile_height,
+      .width = font->tile_width,
+      .height = font->tile_height,
+  };
+
+  return rect;
+}
+
+void unload_bitmap_font(AssetManager *am, BitmapFont **font) {
+  if (!am || !(*font)) {
+    return;
+  }
+
+  remove_asset_from_manager(am, &((*font)->font_atlas));
+
+  free(*font);
+
+  *font = NULL;
+}