yucky textures in openGL on ATI Radeon 9000

[taylorius]

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

 

[Henk]

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.

 

[taylorius]

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