RESOLVED FIXED 189122
[WHLSL] Enumerate which operations require uniform control flow and dynamically uniform expressions 
https://bugs.webkit.org/show_bug.cgi?id=189122
Summary [WHLSL] Enumerate which operations require uniform control flow and dynamical...
Myles C. Maxfield
Reported 2018-08-29 16:35:44 PDT
Indexing into an array of textures requires a dynamically uniform expression sample() involves an implicit derivative, and so requires uniform control flow
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Radar WebKit Bug Importer
Comment 1 2018-09-12 18:50:46 PDT
<rdar://problem/44402999>
Myles C. Maxfield
Comment 2 2018-09-22 23:51:38 PDT
The following functions require uniform control flow: ddx() ddy() AllMemoryBarrierWithGroupSync() DeviceMemoryBarrierWithGroupSync() GroupMemoryBarrierWithGroupSync() Sample() SampleBias() Gather() GatherRed() GatherGreen() GatherBlue() GatherAlpha() SampleCmp() GatherCmp() GatherCmpRed() GatherCmp() GatherCmpRed()
Myles C. Maxfield
Comment 3 2018-09-22 23:52:57 PDT
Indexing into an array which contains textures requires dynamically uniform expressions. I think that's the only operation.
Myles C. Maxfield
Comment 4 2018-09-22 23:54:08 PDT
I suppose this is done now.
Myles C. Maxfield
Comment 5 2018-10-13 14:50:33 PDT
Migrated to https://github.com/gpuweb/WHLSL/issues/58
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