[Bug 57984] r300g: blend sfactor=GL_DST_COLOR fails with FBOs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57984

--- Comment #2 from Marek Olšák <maraeo at gmail.com> ---
(In reply to comment #1)
> I dug through the optimizations in r300_create_blend_state, and the problem
> is the "Disable reading if SRC_ALPHA == 0" optimization. It is not correct
> if the source factor is DEST_COLOR. I'm checking if any other source factors
> have to be excluded.

Yes, you're right. The optimization should check the source RGB and A factors
too.

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