On Sun, 2007-12-08 at 14:43 -0400, James C Georgas wrote:
> As an aside, I'm looking at the 1.4 programming guide (4th ed.), on page
> 418, section "Repeating and Clamping Textures", where it describes the
> tiling effects. I read it like this:
>
> GL_NEAREST ==> GL_CLAMP = GL_CLAMP_TO_EDGE
>
> GL_LINEAR ==> GL_CLAMP = GL_CLAMP_TO_BORDER
>
> Did I interpret it right?
I looked at the output of the texwrap test program in the mesa source,
and it looks like my second assertion above is only true in the texture
co-ordinate range [0,1]. Outside [0,1], GL_CLAMP differs from both
GL_CLAMP_TO_EDGE and GL_CLAMP_TO_BORDER, but only when the filter method
is GL_LINEAR.
So I'll agree with you now that GL_CLAMP can't just be set to
GL_CLAMP_TO_EDGE or GL_CLAMP_TO_BORDER, on hardware that doesn't
implement GL_CLAMP, without breaking compliance to the spec.
I still think a manual override in driconf is a good idea though. Even
on hardware that does implement GL_CLAMP, it'd be handy for old binary
progs that assume GL_CLAMP == GL_CLAMP_TO_EDGE.
James
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