Adding some comments.

include/dawn/display/texture.h

@@ -12,12 +12,16 @@
  * store the pixels in memory because we don't need to!
  */
 typedef struct {
+  /** Width (in pixels) of the texture */
   int32_t width;
+  /** Height (in pixels) of the texture */
   int32_t height;
+  /** Texture ID on the GPU */
   GLuint id;
 } texture_t;
 
 /** Information about a single pixel. */
 typedef struct {
+  /** RGBA Color values */
   uint8_t r, g, b, a;
 } pixel_t;