945GM/I810 OpenGL issue

Rogers Simon SROGERS1 at qinetiq.com
Thu Nov 8 01:42:44 PST 2007

> -----Original Message-----
> From: xorg-bounces at lists.freedesktop.org [mailto:xorg-
> bounces at lists.freedesktop.org] On Behalf Of Brian Paul
> Sent: 07 November 2007 21:31
> To: Simon Rogers
> Cc: xorg at lists.freedesktop.org
> Subject: Re: 945GM/I810 OpenGL issue
> 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

Thanks for this info - is there any way I could have found this out without you telling me?

Are there any similar line stipple limits?

What about the GL_LINE_WIDTH_RANGE which is 1.0 - 3.0. Is this a hardware related limit or can it be increased (compare to my Radeon laptop which can do 1.0 - 64.0)?


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