Comment # 9
on bug 93594
from Michel Dänzer
(In reply to Marek Olšák from comment #8) > If KILL_IF masks out some but not all invocations in a 2x2 quad, the > subsequent DDX and DDY opcodes can result in undefined values, resulting in > garbage on the output. I think Nicolai is making some improvements for the EXEC mask handling for shader images. Maybe that'll help for this as well. Note that AFAIK using things like derivatives in non-uniform control flow isn't supported by GLSL. What's the original GLSL shader?
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