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shader: select consecutive GPU-selected sampler table entries without a switch

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This commit is contained in:
nmzik
2026-10-27 04:11:54 +01:00
parent 3f9666acbb
commit db12f0c5fb
2 changed files with 139 additions and 3 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterImage.cpp
+20 -3
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@@ -813,6 +813,25 @@ uint32_t EmitImageResult(ValueEmitContext& ctx, const IR::Inst& inst, const Emit
return mixed ? value : result_bits(mem.resource, value);
}
// Ordinals outside the table select candidates[0]. Past ordinal 0, a consecutive table is an
// offset of ordinal - 1, which wraps at 0 so that one unsigned compare checks both ends.
uint32_t SamplerArrayIndex(EmitterState& state, uint32_t ordinal,
const std::vector<uint32_t>& candidates) {
const auto count = static_cast<uint32_t>(candidates.size());
const auto gap = std::adjacent_find(candidates.begin() + 1, candidates.end(),
[](uint32_t lhs, uint32_t rhs) { return rhs != lhs + 1u; });
if (count == 1u || gap != candidates.end()) {
return EmitIndexSwitch(state, ordinal, count, TypeU32(state),
[&](uint32_t item) { return ConstantU32(state, candidates[item]); });
}
const auto offset = Binary(state, spv::OpISub, TypeU32(state), ordinal, ConstantU32(state, 1u));
const auto in_table = Binary(state, spv::OpULessThan, TypeBool(state), offset,
ConstantU32(state, count - 1u));
const auto index = Binary(state, spv::OpIAdd, TypeU32(state), offset,
ConstantU32(state, candidates[1]));
return Select(state, TypeU32(state), in_table, index, ConstantU32(state, candidates[0]));
}
struct ImageSampler {
uint32_t id = 0;
bool dynamic = false;
@@ -848,9 +867,7 @@ std::array<ImageSampler, 2> LoadImageSamplers(ValueEmitContext& ctx, const IR::I
selected = EmitIndirectResourceIndex(state, selected,
samplers[index].indirect_mapping_offset,
samplers[index].indirect_search_iterations, 0u);
array_index = EmitIndexSwitch(
state, selected, static_cast<uint32_t>(candidates.size()),
TypeU32(state), [&](uint32_t ordinal) { return ConstantU32(state, candidates[ordinal]); });
array_index = SamplerArrayIndex(state, selected, candidates);
}
sampler = {LoadSamplerDescriptor(state, index, array_index), array_index != 0u};
};