add assets, sprite-packer, sprite rendering (disabled, currently busted)

1 files changed, 64 insertions, 0 deletions

diff --git a/src/sdl/sprites.c b/src/sdl/sprites.c
new file mode 100644
index 0000000..cb127aa
--- /dev/null
+++ b/src/sdl/sprites.c
@@ -0,0 +1,64 @@
+#include <SDL.h>
+#define STB_IMAGE_IMPLEMENTATION
+#define STB_ASSERT(x)
+#define STB_ONLY_PNG
+#include "stb_image.h"
+#include "util.h"
+#include "sprites.h"
+
+typedef struct {
+  const Uint32 r,
+               g,
+               b,
+               a;
+} mask_t;
+
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+static const mask_t
+MASK = { 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff };
+#else 
+static const mask_t
+MASK = { 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000 };
+#endif /* SDL_BYTEORDER */
+
+SDL_Texture *
+sprites_init(
+  SDL_Renderer * const renderer,
+  const char * const png_path
+) {
+  // load image
+  int x, y, n;
+  unsigned char *data = stbi_load(png_path, &x, &y, &n, 4);
+  if (!data) {
+    die("stbi_load()");
+  }
+
+  // create surface
+  SDL_Surface * const surface = SDL_CreateRGBSurfaceFrom(data, x, y, 32, 4 * x, MASK.r, MASK.g, MASK.b, MASK.a);
+  if (!surface) {
+    die("SDLCreateRGBSurfaceFrom(): %s", SDL_GetError());
+  }
+
+  // free image data
+  free(data);
+
+  // create texture
+  SDL_Texture *r = SDL_CreateTextureFromSurface(renderer, surface);
+  if (!r) {
+    die("SDLCreateTextureFromSurface(): %s", SDL_GetError());
+  }
+
+  // free surface
+  SDL_FreeSurface(surface);
+
+  // return texture
+  return r;
+}
+
+SDL_Rect
+sprites_get_rect(
+  const sprite_t sprite
+) {
+  const int x = ((sprite < SPRITE_LAST) ? sprite : SPRITE_NONE) * 32;
+  return (SDL_Rect) { x, 0, 32, 32 };
+}