945GM/I810 OpenGL issue

[Rogers Simon]

> -----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)?

Thanks 
Simon

The information contained in this E-Mail and any subsequent 
correspondence is private and is intended solely for the intended 
recipient(s).  The information in this communication may be 
confidential and/or legally privileged.  Nothing in this e-mail is 
intended to conclude a contract on behalf of QinetiQ or make QinetiQ 
subject to any other legally binding commitments, unless the e-mail 
contains an express statement to the contrary or incorporates a formal Purchase Order.

For those other than the recipient any disclosure, copying, 
distribution, or any action taken or omitted to be taken in reliance 
on such information is prohibited and may be unlawful.

Emails and other electronic communication with QinetiQ may be 
monitored and recorded for business purposes including security, audit 
and archival purposes.  Any response to this email indicates consent 
to this.

Telephone calls to QinetiQ may be monitored or recorded for quality 
control, security and other business purposes.

QinetiQ Limited
Registered in England & Wales: Company Number:3796233
Registered office: 85 Buckingham Gate, London SW1E 6PD, United Kingdom
Trading address: Cody Technology Park, Cody Building, Ively Road, Farnborough, Hampshire, GU14 0LX, United Kingdom 
http://www.QinetiQ.com/home/legal.html