945GM/I810 OpenGL issue

[Brian Paul]

Simon Rogers wrote:
> Hi
> 
> I have two laptops with Intel 945GM gfx, both running CentOS 5. The Xorg 
> log reports build ID xorg-x11-server 1.1.1-48.13.el5. Kernel 2.6.18-8. I 
> also tested this on Ubuntu Gutsy, with the same result.
> 
> The problem: If I define a polygon stipple with horizontal or vertical, 
> one pixel wide stripes, my test app runs at ~300FPS. If I change this 
> stipple pattern to anything else, performance drops by a factor of 10.
> 
> I can provide test source code to demonstrate.
> 
> Apologies if this is the wrong forum.

The i945 hardware only supports a 4x4 stipple pattern.  If the GL 
polygon stipple isn't a 4x4 repeating pattern you'll get a software 
fallback.

-Brian