Re: blending problem with a texture

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From: Jean-Christophe Ulysse (Jean-Christophe.Ulysse++at++loria.fr)
Date: 04/20/2001 05:35:24

On Fri, Apr 20, 2001 at 01:17:43PM +0200, Sylvain Faisan wrote:
> Hi
>
> It's working when A=0 or A=255. Else all appears red but nothing is red
> in the scene! If I change the arguments that I give to the "glBlendFunc"
> function, it changes the saturation of the color red!!
> Have someone any idea?
>

Hi,
I encountered this problem a few month ago on a PC, but I could not solve it.
I think you use a GeForce based card on a PC system.

According to my tests, this seems to be a GL API problem.
I wrote a program 100% GL for testing this stuff without performer,
and verdict was : glBlendFunc() work well on SGI 230 PC Station, SGI Octane,
and ONYX2 Station but NOT on a common PC with a GeForce2. The NVIDIA
implementation seems not support this function.

I posted this on the comp.graphics.api.opengl (Date:2001-01-24 06:50:09 PST)
but no response went.
Solution(?) : buying some SGI stuff (sorry)

Best regards. 

-- 
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  Jean-Christophe Ulysse
  PhD student in Computer Science
  ISA Team
  Laboratoire Lorrain de Recherche en Informatique et ses Applications
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