79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
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#ifndef TEXTURES_H
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#define TEXTURES_H
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#include <SDL2/SDL.h>
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#include <stb_rect_pack.h>
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#include <stdbool.h>
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struct texture {
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SDL_Rect srcrect; /* position in atlas */
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SDL_Surface *data; /* original image data */
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SDL_Texture *loner_data; /* loner textures store their data directly */
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int atlas_index; /* which atlas the texture is in */
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int8_t layer;
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};
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struct texture_cache_item {
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char *key;
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struct texture value;
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};
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/* use the public API to create and manipulate instances of this structure */
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struct texture_cache {
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/* from context */
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SDL_Window *window;
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SDL_Renderer *renderer;
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struct texture_cache_item *hash;
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struct texture_cache_item *loner_hash;
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stbrp_node *node_buffer; /* used internally by stb_rect_pack */
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SDL_Surface **atlas_surfaces;
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SDL_Texture **atlas_textures;
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int atlas_index;
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bool is_dirty; /* current atlas needs to be recreated */
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};
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void textures_cache_init(struct texture_cache *cache, SDL_Window *window);
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void textures_cache_deinit(struct texture_cache *cache);
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/* for debugging */
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void textures_dump_atlases(struct texture_cache *cache);
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/* loads an image if it isn't in the cache, otherwise a no-op. */
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/* can be called from anywhere at any time after init, useful if you want to */
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/* preload textures you know will definitely be used */
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void textures_load(struct texture_cache *cache, char *path);
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/* repacks the current texture atlas based on the texture cache */
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void textures_update_current_atlas(struct texture_cache *cache);
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/* returns a rect in a texture cache atlas based on a path, for drawing */
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/* if the texture is not found, returns a zero-filled rect (so check w or h) */
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SDL_Rect textures_get_srcrect(struct texture_cache *cache, char *path);
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/* returns which atlas the texture in the path is in, starting from 0 */
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/* if the texture is not found, returns INT_MIN */
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int textures_get_atlas_index(struct texture_cache *cache, char *path);
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/* returns a pointer to the atlas at `index` */
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/* if the index is out of bounds, returns NULL. */
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/* you can get the index via texture_get_atlas_index */
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SDL_Texture *textures_get_atlas(struct texture_cache *cache, int index);
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SDL_Texture *textures_get_loner(struct texture_cache *cache, char *path);
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/* returns the number of atlases in the cache */
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size_t textures_get_num_atlases(struct texture_cache *cache);
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#endif
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