Add support for spv::BuiltInSampleMask output
The mask output from the shader is ANDed with the coverage. Slight
wrinkle here in that we have a 4 bit mask of samples in each lane, but we want to
transpose to a 4 bit mask of lane coverage per sample.
Test: dEQP-VK.renderpass.*.multisample.*
Bug: b/118386749
Change-Id: Id4d60bef71cd179915db424aa94a9d9728fb42cd
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/30552
Tested-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
diff --git a/src/Pipeline/PixelProgram.cpp b/src/Pipeline/PixelProgram.cpp
index 6189931..79e79e2 100644
--- a/src/Pipeline/PixelProgram.cpp
+++ b/src/Pipeline/PixelProgram.cpp
@@ -93,6 +93,17 @@
}
}
+ it = spirvShader->outputBuiltins.find(spv::BuiltInSampleMask);
+ if (it != spirvShader->outputBuiltins.end())
+ {
+ auto outputSampleMask = As<SIMD::Int>(routine.getVariable(it->second.Id)[it->second.FirstComponent]);
+
+ for (auto i = 0u; i < state.multiSample; i++)
+ {
+ cMask[i] &= SignMask(CmpNEQ(outputSampleMask & SIMD::Int(1<<i), SIMD::Int(0)));
+ }
+ }
+
it = spirvShader->outputBuiltins.find(spv::BuiltInFragDepth);
if (it != spirvShader->outputBuiltins.end())
{
