glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
- /*
- * Because of clamping, the Z values of the first polygon may
- * be 1.0 (the same as the clear value) so nothing would be
- * drawn if the depth func is GL_LESS. Set it to GL_LEQUAL
- * so we can see polygons with Z==1.
- */
- glDepthFunc(GL_LEQUAL);
-
/* red: offset back */
glEnable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(0, 4);