[Bug 5813] Vertices Corruption in Direct3D mode, ATI & Nvidia cards

http://bugs.winehq.org/show_bug.cgi?id=5813

--- Comment #11 from H. Verbeet   2008-09-03 07:37:43 ---
The Warlords IV demo is broken. It locks data for 4 vertices in the vertex
buffer, but writes data for 6, and also draws 6 vertices. That's why you see
only half the screen in the intro. Using glMapBufferRange() in GL3 for VB locks
could potentially allow this to work anyway, but it would depend on how the
driver handles writing past the mapped region's end, and it's a game bug either
way.