GL_EXT_texture_sRGB and ATI hardware

[K.I.L.E.R]

I remember that the R300 clearly advertised support for sRGB textures.
My question is why is it declared unsupported by the OGL Extension Viewer?

The specs state:
http://www.opengl.org/registry/specs/EXT/texture_sRGB.txt

This extension is written against the OpenGL 2.0 (September 7,
2004) specification.

OpenGL 1.1 required

 

[retrox]

FWIW, the database at delphi3D.net only lists NVIDIA cards supporting this extension (GF FX and up).

 

[Humus]

R300 hardware and up supports the functionality in that extension, but it's not been exposed yet. The driver team has focused mostly on other higher priority tasks lately, such as bringing up a full OpenGL ICD for Vista, which btw is an instance of the famous "OpenGL rewrite" and has been a major undertaking. As this driver matures you should see more focus shifted back to features again.

 

[Zengar]

That is nice to hear, Humus...

 

[Geo]

R300 hardware and up supports the functionality in that extension, but it's not been exposed yet. The driver team has focused mostly on other higher priority tasks lately, such as bringing up a full OpenGL ICD for Vista, which btw is an instance of the famous "OpenGL rewrite" and has been a major undertaking. As this driver matures you should see more focus shifted back to features again.

"Orca", ftw!

Tho I'm still boggling at the idea of functionality that's been in hiding since 2002! I mean, that's taking "lately" to a whole new level!

 

[arjan de lumens]

"Orca", ftw!

Tho I'm still boggling at the idea of functionality that's been in hiding since 2002! I mean, that's taking "lately" to a whole new level!

It is quite possible (although it takes a certain amount of work at the driver level) to implement/fake sRGB texture support by simply expanding sRGB textures to linear-RGB textures with a larger number of bits per channel. This should be entirely doable on the R300; IIRC, R300 supports filtered 16-bit-per-component linear-RGB textures while the sRGB-texture-extension only requires 8 bits per channel and sRGB->linear conversion only requires about 4 extra bits per color channel to work properly.

 

[bloodbob]

"Orca", ftw!

Tho I'm still boggling at the idea of functionality that's been in hiding since 2002! I mean, that's taking "lately" to a whole new level!

SSAA has been hidden since the launch of the product and has been exposed in either D3D or OpenGl. Its really not suprising.

 

[Humus]

Tho I'm still boggling at the idea of functionality that's been in hiding since 2002! I mean, that's taking "lately" to a whole new level!

Well, it's been exposed in DX9 all the time. OpenGL didn't have any extension for this for a long time as it's hardly the most requested feature. The extension is dated August 2005.

 

[Geo]

Well, it's been exposed in DX9 all the time. OpenGL didn't have any extension for this for a long time as it's hardly the most requested feature. The extension is dated August 2005.

Ahh. :smile: