Final: Illumination

src/context.c

@@ -4,6 +4,9 @@
 void set_clean_color_context( unsigned char r, unsigned char g, unsigned char b )
 {
 	glEnable( GL_DEPTH_TEST );
+	glEnable( GL_CULL_FACE );
+	glCullFace( GL_BACK );
+
 	glClearColor( (float)r/0xff, (float)g/0xff, (float)b/0xff, 1.0 );
 }