[Openicc] Xorg low level buffers - colour conversion

[Tomas Carnecky]

Graeme Gill wrote:
> Tomas Carnecky wrote:
> 
>> For the color conversion with shaders, your limiting factor will be the 
>> pixel fillrate. It's currently in the order of 1-15 Gigapixels per 
> 
> Hmm. I would have thought it would be limited by the 3D texture lookup
> rate, which may be a lot slower, since 8 texture value need to
> be looked up and interpolated for each pixel. If there's texture
> caching involved, and the 3D lookups are big enough, then the
> cache hit rate may have an impact as well.
> 

Actually limited by min(pixel-fillrate, texel-fillrate), but since the 
texel fillrate is usually higher then the pixel fillrate...

tom