[Mesa3d-dev] Mesa SOF textrues

[Andrew R. <and...@uc...>]

I can't rem if this was originaly posted here or on DRI but...

If you flush the VB down into the driver (and card) then I have a question.
I want to show video using ogl as the renderer (cf glmovie from loki). So I 
want to paste multiple textures onto muliple quads. Say I have two textures 
and two quads, I want two texture units to do the texturing, one quad-texture 
each. the code is like

glClientActiveTextureARB ( GL_TEXTURE0_ARB );
glTexture2D(/*texture 0*/);
glCallList(QUAD0);

glClientActiveTextureARB ( GL_TEXTURE1_ARB );
glTexture2D(/*texture 1*/);
glCallList(QUAD1);

The second glTexture2D call will flush the VB, but to where? Does the card 
process all of texture/quad 0's stuff? If so I don't see how I can use both 
texture units at the same time for texture procedures that don't share 
verticies. Of course I may not be implementing the dual text-unit stuff 
correctly but even if Im not the question still stands, what happens with 
multi-texturing when the two (or more) units don't share verticies. 

Also how does Mesa deal with references to GL_TEXTURE~N~_ARB where ~N~ is 
larger than the actual number of tex-units, does it map them to the texture 
units that ARE present or is it in the ogl spec that it returns an error?

Thanks
		Andy

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|Andy Richardson                          Dept. of Chemistry            |
|t(w): +44-20-7679 (4718)                 University college London     |
|f(w): +44-20-7679 (4560)                 Gordon street                 |
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