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shader: legalize 1D level-zero gathers

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This commit is contained in:
nmzik
2026-08-29 13:32:20 +04:00
parent ccecebfeff
commit dca7ece2ca
3 changed files with 98 additions and 24 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterImage.cpp
+59
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@@ -439,6 +439,49 @@ uint32_t UnpackImageGather(ValueEmitContext& ctx, const IR::MemoryInfo& mem, uin
return result;
}
uint32_t EmitOneDimensionalGatherLz(ValueEmitContext& ctx, const IR::MemoryInfo& mem, uint32_t pc,
uint32_t coord, bool integer) {
auto& state = ctx.state;
state.builder.RequireCapability(CapabilityImageQuery);
const auto image = LoadSampledImageDescriptor(state, mem, pc, ImageViewKind::Dim1D);
const auto width = state.builder.AllocateId();
state.builder.AddFunction(
{OpImageQuerySizeLod, TypeU32(state), width, image, ConstantU32(state, 0)});
const auto width_f32 = state.builder.AllocateId();
state.builder.AddFunction({OpConvertUToF, TypeF32(state), width_f32, width});
const auto left = state.builder.AllocateId();
state.builder.AddFunction(
{OpExtInst, TypeF32(state), left, GlslStd450(state), GlslFloor,
Binary(state, OpFSub, TypeF32(state),
Binary(state, OpFMul, TypeF32(state), coord, width_f32),
ConstantF32(state, 0x3f000000u))});
const auto sampled = MakeSampledImage(state, mem, pc, ImageViewKind::Dim1D);
const auto vector_type = integer ? TypeU32Vector(state, 4) : TypeF32Vector(state, 4);
const auto scalar_type = integer ? TypeU32(state) : TypeF32(state);
const auto component = ImageConversionFormat(state, mem).format == Prospero::BufferFormat::kInvalid
? ImageGatherComponent(mem.dmask)
: 0u;
uint32_t values[2] {};
for (uint32_t index = 0; index < 2u; index++) {
const auto sample_coord = Binary(
state, OpFDiv, TypeF32(state),
Binary(state, OpFAdd, TypeF32(state), left,
ConstantF32(state, index == 0u ? 0x3f000000u : 0x3fc00000u)),
width_f32);
const auto texel = state.builder.AllocateId();
state.builder.AddFunction({OpImageSampleExplicitLod, vector_type, texel, sampled, sample_coord,
ImageOperandsLodMask, ZeroF32(state)});
values[index] = state.builder.AllocateId();
state.builder.AddFunction(
{OpCompositeExtract, scalar_type, values[index], texel, component});
}
const auto result = state.builder.AllocateId();
state.builder.AddFunction({OpCompositeConstruct, vector_type, result, values[0], values[1],
values[1], values[0]});
return result;
}
uint32_t PackImageTexel(ValueEmitContext& ctx, const IR::MemoryInfo& mem, uint32_t texel) {
const auto info = ImageConversionFormat(ctx.state, mem);
if (info.format == Prospero::BufferFormat::kInvalid) return texel;
@@ -613,6 +656,22 @@ bool EmitValueImage(ValueEmitContext& ctx, const IR::Inst& inst) {
const auto coord =
CoordF32(ctx, mem, *address, layout.coord, ImageViewCoordinateComponents(view));
if (op == IR::ValueOpcode::ImageGatherRaw) {
if (view == ImageViewKind::Dim1D) {
if (dref || !HasFlag(mem, Decoder::ImageSampleFlagLevelZero) ||
HasFlag(mem, Decoder::ImageSampleFlagOffset) ||
HasFlag(mem, Decoder::ImageSampleFlagGatherHorizontal)) {
ctx.Fail(inst, "has an unsupported 1D gather variant");
return true;
}
const auto sample = EmitOneDimensionalGatherLz(ctx, mem, pc, coord, integer);
ctx.Define(inst, ResultVector(ctx, UnpackImageGather(ctx, mem, sample), integer,
false, mem, true));
return true;
}
if (view == ImageViewKind::Dim1DArray) {
ctx.Fail(inst, "has an unsupported 1D-array gather");
return true;
}
const auto sampled = MakeSampledImage(state, mem, pc, view);
const auto sample = state.builder.AllocateId();
std::vector<uint32_t> words =