townengine/src/textures/internal_api.h

#ifndef TEXTURES_INTERNAL_API_H
#define TEXTURES_INTERNAL_API_H

#include "../util.h"
#include "../textures/modes.h"

#include <SDL2/SDL.h>
#include <stb_rect_pack.h>
#include <glad/glad.h>

#include <stdbool.h>

struct texture {
    t_rect srcrect;             /* position in atlas */
    SDL_Surface *data;          /* original image data */
    int atlas_index;
    GLuint loner_texture;       /* stored directly for loners, == 0 means atlas_index should be used */
    enum texture_mode mode;
};


struct texture_cache_item {
    char *key;
    struct texture value;
};


struct texture_cache {
    SDL_Window *window;          /* from context */

    struct texture_cache_item *hash;

    stbrp_node *node_buffer;     /* used internally by stb_rect_pack */

    SDL_Surface **atlas_surfaces;
    GLuint *atlas_textures;      /* shared by atlas textures */
    int atlas_index;             /* atlas that is currently being built */

    bool is_dirty;               /* current atlas needs to be recreated */
};

#endif