Here's a proposed fix for bug #35073, but I'd like some review. From
googling, it looks like we're not the first driver to stumble on this.
Here's the note from the bug reporter:
The OpenGL spec looks a little unclear to me - it says the
alpha test "applies only in RGBA mode, and only if the color
buffer has a fixed-point or floating-point format", but I
don't see what it wants if there is no color buffer. I think
the most useful and compatible behaviour would be to apply the
alpha test in this case and to compute the correct alpha value
first.
I'm agreeing with the reporter here with this patch series.
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