[Dri-devel] r200 / radeon blend trouble

[Roland Scheidegger]

When I was playing around with texenv (I'm trying to implement 
GL_EXT_blend_func_separate and GL_EXT_blend_equation_separate for the 
R200, though my attempts to modify texenv to make it a useful test for 
that were unsuccesful), I've noticed that the radeon and r200 driver 
announce GL_EXT_blend_color (because it's part of the imaging subset), 
but neither one implements it at all. Unsurprisingly, it doesn't work 
(seems to use some sort of a default color, though not the Open GL 
default color for this extension).
I've looked throgh the r200_reg.h and radeon_reg.h but couldn't find an 
obvious register to store the constant blend color. In fact, ATI says 
GL_EXT_blend_color isn't available on the R100, so maybe this needs a 
different approach. Any ideas?

Roland

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