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shader: initialize perspective sample barycentrics at SampleId

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This commit is contained in:
Claxten
2026-10-07 18:22:36 +04:00
committed by nmzik
parent fbf6ae400c
commit 3ba6ebae81
8 changed files with 99 additions and 6 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterFlow.cpp
+15 -5
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@@ -42,8 +42,9 @@ uint32_t EmitBuiltinU32(EmitterState& state, IR::StageInputKind kind, uint32_t c
EmitBinaryU32(state, spv::OpIMul, group, ConstantU32(state, size)));
}
const bool centroid = kind == IR::StageInputKind::BaryCoordSmoothCentroid;
const bool sample = kind == IR::StageInputKind::BaryCoordSmoothSample;
const auto variable = InputVariableForKind(
state, centroid ? IR::StageInputKind::BaryCoordSmooth : kind);
state, centroid || sample ? IR::StageInputKind::BaryCoordSmooth : kind);
if (variable == 0) {
return ConstantU32(state, 0);
}
@@ -76,15 +77,24 @@ uint32_t EmitBuiltinU32(EmitterState& state, IR::StageInputKind kind, uint32_t c
state.builder.AddFunction(spv::OpBitcast, TypeU32(state), bits, value);
return bits;
}
if (centroid || kind == IR::StageInputKind::BaryCoordSmooth ||
if (centroid || sample || kind == IR::StageInputKind::BaryCoordSmooth ||
kind == IR::StageInputKind::BaryCoordNoPerspective) {
const auto value = state.builder.AllocateId();
const auto bits = state.builder.AllocateId();
if (centroid) {
if (centroid || sample) {
const auto coordinates = state.builder.AllocateId();
state.builder.RequireCapability(spv::CapabilityInterpolationFunction);
state.builder.AddFunction(spv::OpExtInst, TypeF32Vector(state, 3), coordinates,
GlslStd450(state), GLSLstd450InterpolateAtCentroid, variable);
if (sample) {
const auto sample_id = state.builder.AllocateId();
state.builder.AddFunction(spv::OpLoad, TypeI32(state), sample_id,
InputVariableForKind(state, IR::StageInputKind::SampleId));
state.builder.AddFunction(spv::OpExtInst, TypeF32Vector(state, 3), coordinates,
GlslStd450(state), GLSLstd450InterpolateAtSample,
variable, sample_id);
} else {
state.builder.AddFunction(spv::OpExtInst, TypeF32Vector(state, 3), coordinates,
GlslStd450(state), GLSLstd450InterpolateAtCentroid, variable);
}
state.builder.AddFunction(spv::OpCompositeExtract, TypeF32(state), value,
coordinates, component + 1u);
} else {