Comment # 12
on bug 98664
from Ilia Mirkin
(In reply to Nicolai Hähnle from comment #10) > The geometry shader is incorrect. I guess it works on i965 because the NIR > path skips some optimizations that are allowed by the GLSL spec, which has > this to say about EmitVertex(): > > "Emits the current values of output variables to the current > output primitive. On return from this call, the values of > output variables are undefined." > > In other words, you need to store outMinEdge / outMaxEdge in temporary > variables. FWIW I've noticed that NVIDIA blob tends to go exactly counter to this, and explicitly "latches" the values. (While i965 hardware behaves this way by default, NVIDIA hw does not - it takes extra effort to make it do that, and the NVIDIA blob does it. We've resorted to doing it for gl_Layer/gl_ViewportIndex in nouveau, but not other varyings.) Note that it's not necessary to re-emit flat varyings for every vertex, just the provoking vertex. This tends to be the last vertex by default, I believe. (And I don't know if that's prior to strip decomposition or not.)
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