Added texture loading.

src/engine/file/asset.c

@@ -7,6 +7,11 @@
 
 #include "asset.h"
 
+#ifndef STB_IMAGE_IMPLEMENTATION
+  #define STB_IMAGE_IMPLEMENTATION
+  #include <stb_image.h>
+#endif
+
 char * assetStringLoad(char *assetName) {
   // Open a buffer.
   FILE *fptr = assetBufferOpen(assetName);
@@ -88,4 +93,37 @@ shader_t * assetShaderLoad(char *fileVertex, char *fileFragment) {
   free(fragmentShader);
 
   return shader;//shader may be NULL if loading failed, but not our problem.
+}
+
+texture_t * assetTextureLoad(char *fileName) {
+  FILE *buffer;
+  texture_t *texture;
+  int channels, width, height;
+  pixel_t *data;
+  stbi_io_callbacks OPENGL_STBI_CALLBACKS;
+
+  buffer = assetBufferOpen(fileName);
+  if(buffer == NULL) return NULL;
+  
+  // Setup the interface for STBI
+  OPENGL_STBI_CALLBACKS.read = &assetBufferRead;
+  OPENGL_STBI_CALLBACKS.skip = &assetBufferSkip;
+  OPENGL_STBI_CALLBACKS.eof = &assetBufferEnd; 
+
+  // Buffer the image
+  channels = 0;
+  data = (pixel_t *)stbi_load_from_callbacks(
+    &OPENGL_STBI_CALLBACKS, buffer,
+    &width, &height,
+    &channels, STBI_rgb_alpha
+  );
+
+  // Close the buffer
+  assetBufferClose(buffer);
+  if(data == NULL) return NULL;
+
+  // Turn into a texture.
+  texture = textureCreate(width, height, data);
+  stbi_image_free(data);
+  return texture;
 }

src/engine/file/asset.h

@@ -75,4 +75,9 @@ void assetBufferSkip(FILE *buffer, int32_t n);
  * @param fileFragment The file path of the fragment shader
  * @return The loaded shader_t instance (From shaderCompile)
  */
-shader_t * assetShaderLoad(char *fileVertex, char *fileFragment);
+shader_t * assetShaderLoad(char *fileVertex, char *fileFragment);
+
+/**
+ * Load a texture from a PNG file.
+ */
+texture_t * assetTextureLoad(char *fileName);