Slightly rework scene rendering

Changelog:
- Draw calls are now in rendering function of a scene
    - This is to allow flexibility on how a scene is rendered
- Modify level scene to render level using RenderTexture
    - This is to prepare for camera implementation later
- CloseWindow is called after all de-init functions is called

assets_test.c

@@ -56,6 +56,6 @@ int main(void)
             spr2->elapsed = 0;
         }
     } 
-    CloseWindow();
     term_assets(&assets);
+    CloseWindow();
 }

engine/editor_scene.c

@@ -28,11 +28,13 @@ static inline unsigned int get_tile_idx(int x, int y, unsigned int tilemap_width
 
 static void level_scene_render_func(Scene_t* scene)
 {
-    LevelSceneData_t* data = (LevelSceneData_t *)scene->scene_data;
-    TileGrid_t tilemap = data->tilemap;
+    LevelScene_t* lvl_scene = container_of(scene, LevelScene_t, scene);
+    TileGrid_t tilemap = lvl_scene->data.tilemap;
 
     Entity_t* p_ent;
 
+    BeginTextureMode(lvl_scene->data.game_viewport);
+        ClearBackground(RAYWHITE);
         for (size_t i = 0; i < tilemap.n_tiles; ++i)
         {
             char buffer[6] = {0};
@@ -140,7 +142,16 @@ static void level_scene_render_func(Scene_t* scene)
             int y = (i+1)*TILE_SIZE;
             DrawLine(0, y, tilemap.width * TILE_SIZE, y, BLACK);
         }
+    EndTextureMode();
 
+    BeginDrawing();
+        ClearBackground(SKYBLUE);
+        DrawTextureRec(
+            lvl_scene->data.game_viewport.texture,
+            (Rectangle){0, 0, lvl_scene->data.game_sz.x, -lvl_scene->data.game_sz.y},
+            (Vector2){ 0, 0 },
+            WHITE
+        );
         // For DEBUG
         sc_map_foreach_value(&scene->ent_manager.entities_map[PLAYER_ENT_TAG], p_ent)
         {
@@ -173,6 +184,7 @@ static void level_scene_render_func(Scene_t* scene)
         static char mempool_stats[512];
         print_mempool_stats(mempool_stats);
         DrawText(mempool_stats, tilemap.width * TILE_SIZE + 1, 350, 12, BLACK);
+    EndDrawing();
 }
 
 static void spawn_crate(Scene_t* scene, unsigned int tile_idx, bool metal)

engine/game_systems.c

@@ -634,7 +634,7 @@ void tile_collision_system(Scene_t* scene)
         //    Entity_t *p_other_ent = get_entity(&scene->ent_manager, other_ent_idx);
         //    if (!p_ent->m_alive || !p_other_ent->m_alive) continue;
         //}
-        sc_map_clear_32(&data->collision_events);
+        //sc_map_clear_32(&data->collision_events);
 
         // Level boundary collision
         unsigned int level_width = tilemap.width * TILE_SIZE;
@@ -1094,12 +1094,15 @@ void sprite_animation_system(Scene_t* scene)
 
 void init_level_scene_data(LevelSceneData_t* data)
 {
-    sc_map_init_32(&data->collision_events, 128, 0);
+    //sc_map_init_32(&data->collision_events, 128, 0);
+    data->game_viewport = LoadRenderTexture(32*TILE_SIZE, 16*TILE_SIZE);
+    data->game_sz = (Vector2){32*TILE_SIZE, 16*TILE_SIZE};
 }
 
 void term_level_scene_data(LevelSceneData_t* data)
 {
-    sc_map_term_32(&data->collision_events);
+    //sc_map_term_32(&data->collision_events);
+    UnloadRenderTexture(data->game_viewport); // Unload render texture
 }
 
 unsigned int player_sprite_transition_func(Entity_t* ent)

engine/menu_scene.c

@@ -6,10 +6,13 @@
 static void menu_scene_render_func(Scene_t* scene)
 {
     MenuSceneData_t* data = (MenuSceneData_t*)scene->scene_data;
+    BeginDrawing();
+        ClearBackground(RAYWHITE);
         DrawText("This is a game", 25, 220, 12, BLACK);
         UI_button(data->buttons, "Start");
         UI_button(data->buttons + 1, "Continue");
         UI_button(data->buttons + 2, "Exit");
+    EndDrawing();
 }
 
 static void menu_do_action(Scene_t* scene, ActionType_t action, bool pressed)

engine/scene_impl.h

@@ -7,6 +7,10 @@
 #include "engine.h"
 #include "gui.h"
 
+#define container_of(ptr, type, member) ({         \
+    const typeof( ((type *)0)->member ) *__mptr = (ptr); \
+    (type *)( (char *)__mptr - offsetof(type,member) );})
+
 typedef enum TileType {
     EMPTY_TILE = 0,
     SOLID_TILE,
@@ -38,7 +42,8 @@ typedef struct TileGrid {
 
 typedef struct LevelSceneData {
     TileGrid_t tilemap;
-    struct sc_map_32 collision_events;
+    RenderTexture2D game_viewport;
+    Vector2 game_sz;
 }LevelSceneData_t;
 
 typedef struct LevelScene {

menu_test.c

@@ -57,7 +57,7 @@ int main(void)
         EndDrawing();
         if (WindowShouldClose()) break;
     } 
-    CloseWindow();
     free_menu_scene(&scene);
     sc_queue_term(&key_buffer);
+    CloseWindow();
 }

scene_test.c

@@ -77,13 +77,11 @@ int main(void)
         update_scene(&scene.scene);
         update_entity_manager(&scene.scene.ent_manager);
         // This is needed to advance time delta
-        BeginDrawing();
         render_scene(&scene.scene);
-            ClearBackground(RAYWHITE);
-        EndDrawing();
         if (WindowShouldClose()) break;
     } 
-    CloseWindow();
     free_level_scene(&scene);
     sc_queue_term(&key_buffer);
+    term_assets(&engine.assets);
+    CloseWindow();
 }