Ok, I was wrong that the radeon driver also doesn't implement this correctly. It just always uses a fallback, it just doesn't support it in hardware. That said, I'm wondering what's the purpose of announcing ARB_imaging support, at least out of the three blend extensions this includes (EXT_blend_color, EXT_blend_minmax, EXT_blend_subtract) two aren't supported at all and the third (blend_subtract) only half. Rasterization fallbacks are evil...
I'm of the same opinion - I'd rather see the extensions accurately reflect what the card is capable of.
Keith
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