[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 #1 from Stefan Dösinger <stefandoesinger at gmx.at> ---
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.

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