Adding some comments.

include/dawn/display/primitive.h

@@ -13,16 +13,22 @@
 
 /** Structure containing information about a primitive */
 typedef struct {
+  /** How many vertices are in the primitive */
   int32_t verticeCount;
+  /** How many indices are in the primitive */
   int32_t indiceCount;
 
+  /** Pointer to the vertex buffer on the GPU */
   GLuint vertexBuffer;
+  /** Pointer to the index buffer on the GPU */
   GLuint indexBuffer;
 } primitive_t;
 
 /** Structure containing vertice position information */
 typedef struct {
+  /** Coordinates */
   float x, y, z;
+  /** Texture UVs */
   float u, v;
 } vertice_t;