Add placeholder algorithms

TODO comments for implementation.

src/packages/game/IZ_app_video.c

@@ -115,19 +115,21 @@ void IZ_VideoUpdate(IZ_VideoState* video_state) {
 		SDL_SetRenderDrawColor(video_state->renderer, 0x00, 0x00, 0x00, 0xff);
 		SDL_RenderClear(video_state->renderer);
 		u16 sprite_index;
+		// TODO: optimize this, cut the loop as much as possible.
 		for (sprite_index = 0; sprite_index < MAX_ACTIVE_SPRITES; sprite_index += 1) {
 			if (!video_state->active_sprites[sprite_index].sprite.texture) {
 				continue;
 			}
-			IZ_Sprite* loaded_sprite = &video_state->active_sprites[sprite_index].sprite;
-			f32 draw_width = loaded_sprite->original_width * loaded_sprite->scale_factor;
-			f32 draw_height = loaded_sprite->original_height * loaded_sprite->scale_factor;
-			SDL_RenderCopyExF(video_state->renderer, loaded_sprite->texture, NULL, &(SDL_FRect) {
+			IZ_Sprite* sprite = &video_state->active_sprites[sprite_index].sprite;
+			f32 draw_width = sprite->original_width * sprite->scale_factor;
+			f32 draw_height = sprite->original_height * sprite->scale_factor;
+			SDL_RenderCopyExF(video_state->renderer, sprite->texture, NULL, &(SDL_FRect) {
+				// TODO honor each sprite's location in the world for calculation in the screen.
 				.x = 100,
 				.y = 100,
 				.w = draw_width,
 				.h = draw_height,
-			}, loaded_sprite->rotate_degrees++, &(SDL_FPoint) {
+			}, sprite->rotate_degrees++, &(SDL_FPoint) {
 				.x = draw_width / 2,
 				.y = draw_height / 2,
 			}, SDL_FLIP_NONE);

src/packages/game/output/video/IZ_video.c

@@ -96,6 +96,11 @@ void IZ_VideoTeardown(IZ_VideoState* state) {
 }
 
 u16 IZ_VideoGetNextFreeSpriteSlot(IZ_VideoState* state) {
+	// TODO:
+	//   1. Run through all sprites in the active sprites array
+	//   2. Check each sprite's priority and requested_at (for eviction policy)
+	//   3. Return that new slot. (prefer returning empty slots)
+	//   4. Return the max value for u16 if there's not slot left)
 	return 0;
 }