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[SPIR-V] Auto apply flat interpolation to integer fragment inputs

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Ribbit 2025-10-06 21:11:26 -07:00 • committed by crueter
parent 954c17c18a
commit cb6da0409b
1 changed files with 49 additions and 0 deletions
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49
src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
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@ -98,6 +98,48 @@ Id ImageType(EmitContext& ctx, const ImageDescriptor& desc, Id sampled_type) {
throw InvalidArgument("Invalid texture type {}", desc.type);
}
bool MatchesVectorType(const VectorTypes& vectors, Id type) {
for (std::size_t components = 1; components <= 4; ++components) {
const Id candidate{vectors[components]};
if (candidate.value != 0 && candidate.value == type.value) {
return true;
}
}
return false;
}
bool HasIntegerOrDoubleComponent(const EmitContext& ctx, Id type) {
if (MatchesVectorType(ctx.U32, type) || MatchesVectorType(ctx.S32, type)) {
return true;
}
if (MatchesVectorType(ctx.F64, type)) {
return true;
}
if (ctx.profile.support_int8) {
if ((ctx.U8.value != 0 && ctx.U8.value == type.value) ||
(ctx.S8.value != 0 && ctx.S8.value == type.value)) {
return true;
}
}
if (ctx.profile.support_int16) {
if ((ctx.U16.value != 0 && ctx.U16.value == type.value) ||
(ctx.S16.value != 0 && ctx.S16.value == type.value)) {
return true;
}
}
if (ctx.profile.support_int64) {
if (ctx.U64.value != 0 && ctx.U64.value == type.value) {
return true;
}
}
return false;
}
bool RequiresFlatDecoration(const EmitContext& ctx, Id type, spv::StorageClass storage_class) {
return ctx.stage == Stage::Fragment && storage_class == spv::StorageClass::Input &&
HasIntegerOrDoubleComponent(ctx, type);
}
Id DefineVariable(EmitContext& ctx, Id type, std::optional<spv::BuiltIn> builtin,
spv::StorageClass storage_class, std::optional<Id> initializer = std::nullopt) {
const Id pointer_type{ctx.TypePointer(storage_class, type)};
@ -105,6 +147,9 @@ Id DefineVariable(EmitContext& ctx, Id type, std::optional<spv::BuiltIn> builtin
if (builtin) {
ctx.Decorate(id, spv::Decoration::BuiltIn, *builtin);
}
if (RequiresFlatDecoration(ctx, type, storage_class)) {
ctx.Decorate(id, spv::Decoration::Flat);
}
ctx.interfaces.push_back(id);
return id;
}
@ -1552,6 +1597,9 @@ void EmitContext::DefineInputs(const IR::Program& program) {
if (stage != Stage::Fragment) {
continue;
}
if (RequiresFlatDecoration(*this, type, spv::StorageClass::Input)) {
continue;
}
switch (info.interpolation[index]) {
case Interpolation::Smooth:
// Default
@ -1678,3 +1726,4 @@ void EmitContext::DefineOutputs(const IR::Program& program) {
}
} // namespace Shader::Backend::SPIRV