Enabled SDL_image's support for PNG and TIFF files and improved the

AssetManager with a hashing function, a linked list structure to store
the hashes as well as a reference counter to support multiple users
sharing the same asset.

include/AssetManager.h

@@ -5,7 +5,11 @@
 #include "SDL_mixer.h"
 #include "SDL_render.h"
 #include "reusable_ids.h"
-#include <stdint.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif // !__cplusplus
 
 typedef enum {
   ASSET_TYPE_IMAGE,
@@ -19,10 +23,14 @@ typedef struct asset_manager AssetManager;
 AssetManager *create_asset_manager();
 AssetID load_asset_to_manager(AssetManager *am, const char *path,
                               AssetType type, Renderer *renderer);
-void remove_asset_from_manager(AssetManager *am, AssetID id);
+void remove_asset_from_manager(AssetManager *am, AssetID *id_ptr);
 SDL_Texture *get_texture(AssetManager *am, AssetID id);
 Mix_Chunk *get_audio_chunk(AssetManager *am, AssetID id);
 Mix_Music *get_music(AssetManager *am, AssetID id);
 void destroy_asset_manager(AssetManager *am);
 
+#ifdef __cplusplus
+}
+#endif // !__cplusplus
+
 #endif // !ASSET_MANAGER_H

include/GameEngine.h

@@ -7,18 +7,26 @@
 #include "reusable_ids.h"
 #include <stdbool.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif // !__cplusplus
+
 bool init_game(const char *game_name, int window_width, int window_height,
                SDL_Color window_background_color, bool full_screen);
 bool game_running();
 ObjectID add_object(void *object, EventHandlerPtr eh, UpdateFuncPtr uf,
                     RenderFuncPtr rf);
-void remove_object(ObjectID id);
+void remove_object(ObjectID *id);
 AssetID load_asset(const char *path, AssetType type);
 void render_texture_asset(AssetID id, float x, float y, float w, float h);
-void close_asset(AssetID id);
+void close_asset(AssetID *id);
 void handle_events();
 void update();
 void render();
 void close_game();
 
+#ifdef __cplusplus
+}
+#endif // !__cplusplus
+
 #endif // !GAME_H

include/ObjectStore.h

@@ -6,6 +6,10 @@
 #include "engine_build_config.h"
 #include "reusable_ids.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif // !__cplusplus
+
 typedef void (*EventHandlerPtr)(const SDL_Event *event, void *object);
 typedef void (*UpdateFuncPtr)(float delta, void *object);
 typedef void (*RenderFuncPtr)(void *object);
@@ -15,7 +19,7 @@ typedef struct object_store ObjectStore;
 ObjectStore *create_object_store();
 ObjectID add_object_to_store(ObjectStore *os, void *object, EventHandlerPtr eh,
                              UpdateFuncPtr uf, RenderFuncPtr rf);
-void remove_object_from_store(ObjectStore *os, ObjectID id);
+void remove_object_from_store(ObjectStore *os, ObjectID *id_ptr);
 void handle_all_objects_events(ObjectStore *os, const SDL_Event *event);
 void update_all_objects(ObjectStore *os, float delta);
 void render_all_objects(ObjectStore *os);
@@ -25,4 +29,8 @@ void destroy_object_store(ObjectStore *os);
 void print_objects(ObjectStore *os);
 #endif // !DEBUG_ENGINE
 
+#ifdef __cplusplus
+}
+#endif // !__cplusplus
+
 #endif // !OBJECT_STORE_H

include/Renderer.h

@@ -6,6 +6,10 @@
 #include "SDL_video.h"
 #include <stdbool.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif // !__cplusplus
+
 typedef struct renderer Renderer;
 
 Renderer *create_renderer();
@@ -17,4 +21,8 @@ void render_texture(const Renderer *renderer, SDL_Texture *texture, float x,
 void swap_buffers(const Renderer *renderer);
 void destroy_renderer(Renderer *renderer);
 
+#ifdef __cplusplus
+}
+#endif // !__cplusplus
+
 #endif // !RENDERER_H

include/Window.h

@@ -6,6 +6,10 @@
 #include "SDL_pixels.h"
 #include <stdbool.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif // !__cplusplus
+
 typedef struct window {
   int width;
   int height;
@@ -20,4 +24,8 @@ void clear_window(const Window *wnd);
 void swap_render_buffers(const Window *wnd);
 void destroy_window(Window *wnd);
 
+#ifdef __cplusplus
+}
+#endif // !__cplusplus
+
 #endif // !WINDOW_H

include/constants.h

@@ -1,6 +1,10 @@
 #ifndef CONSTANTS_H
 #define CONSTANTS_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif // !__cplusplus
+
 #define INTERNAL static
 
 #define MAX_OBJ_COUNT 10000
@@ -8,4 +12,8 @@
 #define HASH_PRIME_01 1987
 #define HASH_PRIME_02 7919
 
+#ifdef __cplusplus
+}
+#endif // !__cplusplus
+
 #endif // !CONSTANTS_H

include/reusable_ids.h

@@ -4,9 +4,19 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif // !__cplusplus
+
+#define INVALID_ID -1
+
 typedef int32_t ObjectID;
 typedef int32_t AssetID;
 
 int32_t reuse_id(int32_t *ids, size_t count);
 
+#ifdef __cplusplus
+}
+#endif // !__cplusplus
+
 #endif // !REUSABLE_IDS_H