Hi, I have a windows openGL application that uses texture maps. On a
system with an Nvidia geForce 2, all is well. However, on my ATI
Radeon 9000 system, the textures look as if they are being stored in
something like 4 bits per channel colour. (The images I send to the
card are 24 bits per pixel).

If I change the Texture preference slider on the openGL tab in the
display settings from "quality" to "high quality", this fixes things.
My question is, is there a way of setting the card to "high quality"
texture mode from software. Perhaps an opengl extension command?

Many thanks for any help

Matt Taylor

"taylorius" <taylorius@hotmail.com> schreef in bericht
news:c706d39b.0307010820.584b8d46@posting.google.com...
> Hi, I have a windows openGL application that uses texture maps. On a
> system with an Nvidia geForce 2, all is well. However, on my ATI
> Radeon 9000 system, the textures look as if they are being stored in
> something like 4 bits per channel colour. (The images I send to the
> card are 24 bits per pixel).

Are you using GL_RGBA8 or GL_RGBA for your internal format in
glTexImage2D()? Using GL_RGBA8 will likely give better results on an ATI.

> If I change the Texture preference slider on the openGL tab in the
> display settings from "quality" to "high quality", this fixes things.
> My question is, is there a way of setting the card to "high quality"
> texture mode from software. Perhaps an opengl extension command?
>
> Many thanks for any help
>
> Matt Taylor

"Henk" <kansler@hotmail.com> wrote in message news:<bdsgdv$fje$1@news.hccnet.nl>...
> 
> Are you using GL_RGBA8 or GL_RGBA for your internal format in
> glTexImage2D()? Using GL_RGBA8 will likely give better results on an ATI.
> 

Yes! That was it. GL_RGBA8 completely fixes it. Thanks a lot!

Here's an article that describes this, for anybody else suffering from
blotchy textures!

http://www.flipcode.com/cworks/issue05.shtml

Many thanks

Matt Taylor