-/* static test_* functions are going to be removed: just to test the shaders */
-static void test_draw();
-static void test_torus();
+static void clear(float r, float g, float b);
+static void viewport(int x, int y, int width, int height);
+static void zbuffer(bool enable);
+static void cull_face(Gfx_cull_face cf);