full removal of SDL_Renderer usage, working spatial triangle rendering, temporary(?) regression of HDPI

src/textures.h

@@ -1,46 +1,10 @@
 #ifndef TEXTURES_H
 #define TEXTURES_H
 
+#include "private/textures.h"
 
 #include <SDL2/SDL.h>
-#include <stb_rect_pack.h>
-
-#include <stdbool.h>
-
-
-struct texture {
-    SDL_Rect srcrect;           /* position in atlas */
-    SDL_Surface *data;          /* original image data */
-    SDL_Texture *loner_data;    /* loner textures store their data directly */
-    int atlas_index;            /* which atlas the texture is in */
-    int8_t layer;
-};
-
-
-struct texture_cache_item {
-    char *key;
-    struct texture value;
-};
-
-
-/* use the public API to create and manipulate instances of this structure */
-struct texture_cache {
-    /* from context */
-    SDL_Window *window;
-    SDL_Renderer *renderer;
-
-    struct texture_cache_item *hash;
-    struct texture_cache_item *loner_hash;
-
-    stbrp_node *node_buffer; /* used internally by stb_rect_pack */
-
-    SDL_Surface **atlas_surfaces;
-    SDL_Texture **atlas_textures;
-    int atlas_index;
-
-    bool is_dirty;              /* current atlas needs to be recreated */
-};
-
+#include <glad/glad.h>
 
 void textures_cache_init(struct texture_cache *cache, SDL_Window *window);
 void textures_cache_deinit(struct texture_cache *cache);
@@ -64,15 +28,12 @@ SDL_Rect textures_get_srcrect(struct texture_cache *cache, const char *path);
 /* if the texture is not found, returns INT_MIN */
 int textures_get_atlas_index(struct texture_cache *cache, const char *path);
 
-/* returns a pointer to the atlas at `index` */
-/* if the index is out of bounds, returns NULL. */
-/* you can get the index via texture_get_atlas_index */
-SDL_Texture *textures_get_atlas(struct texture_cache *cache, int index);
+/* binds atlas texture in opengl state */
+void textures_bind_atlas(struct texture_cache *cache, int index, GLenum target);
 
-SDL_Texture *textures_get_loner(struct texture_cache *cache, const char *path);
+void textures_bind_loner(struct texture_cache *cache, const char *path, GLenum target);
 
 /* returns the number of atlases in the cache */
 size_t textures_get_num_atlases(struct texture_cache *cache);
 
-
 #endif