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?
Are you sure? It looks like the code is all there in r200_state.c:
void r200BlendFuncSeparate( ... )
{
... case GL_CONSTANT_COLOR:
b |= R200_SRC_BLEND_GL_CONST_COLOR;
break;
case GL_ONE_MINUS_CONSTANT_COLOR:
b |= R200_SRC_BLEND_GL_ONE_MINUS_CONST_COLOR;
break;
case GL_CONSTANT_ALPHA:
b |= R200_SRC_BLEND_GL_CONST_ALPHA;
break;
case GL_ONE_MINUS_CONSTANT_ALPHA:
b |= R200_SRC_BLEND_GL_ONE_MINUS_CONST_ALPHA;
break;
}Am I missing something -- isn't this setting the appropriate blend modes? Is the constant color not getting updated correctly?
Keith
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