[Gtkradiant] ATI Developer Contact

[Timothee Besset]

Interesting. ATI drivers are often broken on Windows. I'm not sure the ATI
problems on win32 are the same as this one though. I suppose those FireGL
drivers are also closed source?

What are you planning to do? Do you want to investigate this further in
GtkR and fix the rendering? Or you are just posting this as an FYI to us?

regards

TTimo

On Fri, 17 Jan 2003 17:34:26 +0100
david.olofson@reologica.se wrote:

> 
> I'm back (though not for serious mapping, yet), but the ATI FireGL 
> Linux drivers are still broken... (No brushes in the camera view 
> without hacking GtkRadiant.)
> 
> It appears that I'm the only one who knows about this bug or 
> something, as this is two driver releases later. (I don't remember if 
> this happened with the Windows drivers as well, and I can't test on 
> Windows right now.) Should have reported it back then, but got 
> seriously sidetracked and never got around to it.
> 
> I have a detailed report, but I've lost the contact email address. I 
> got it from someone on this list, IIRC. Does anyone have a suitable 
> address?
> 
> 
> Here's the interesting part of the report, BTW:
> ---------------------------------------------------------------------
> Test code:
>         glPolygonMode(GL_BACK, pmback);
>         glPolygonMode(GL_FRONT, pmfront);
>         if(GL_FALSE != cullface)
>         {
>                 glCullFace(cullface);
>                 glEnable(GL_CULL_FACE);
>         }
>         else
>                 glDisable(GL_CULL_FACE);
> 
> (Only tested with quads.)
> 
> Variables and results:
> 
>         pmback  pmfront cullface result
>         -------------------------------------------------------------
>         GL_FILL GL_FILL GL_FALSE OK
>         GL_FILL GL_FILL GL_BACK  OK
>         GL_FILL GL_FILL GL_FRONT OK
> 
>         GL_FILL GL_LINE GL_FALSE OK
>         GL_FILL GL_LINE GL_BACK  BROKEN! (1)
>         GL_FILL GL_LINE GL_FRONT BROKEN! (2)
> 
>         GL_LINE GL_FILL GL_FALSE OK
>         GL_LINE GL_FILL GL_BACK  BROKEN! (2)
>         GL_LINE GL_FILL GL_FRONT BROKEN! (1)
> 
>         GL_LINE GL_LINE GL_FALSE OK
>         GL_LINE GL_LINE GL_BACK  OK
>         GL_LINE GL_LINE GL_FRONT OK
> 
> (1) No culling is performed. Both sides are rendered as wireframe.
> (2) Nothing but an occasional single corner pixel is rendered.
> 
> Conclusion:
>         When one side is culled, and back and front modes differ,
>         ATI's FireGL 8x00 driver screws up one way or another.
> ---------------------------------------------------------------------
> 
> 
> Thanks,
> 
> 
> //David Olofson - Programmer, Composer, Open Source Advocate
> 
> .- The Return of Audiality! --------------------------------.
> | Free/Open Source Audio Engine for use in Games or Studio. |
> | RT and off-line synth. Scripting. Sample accurate timing. |
> `---------------------------> http://olofson.net/audiality -'
>    --- http://olofson.net --- http://www.reologica.se ---
> 
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