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https://github.com/doitsujin/dxvk.git
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[dxvk] Introduce SPIR-V pass to inject render target swizzles
This commit is contained in:
Philip Rebohle
parent
48ac9b27e4
commit
c401167161
@ -379,6 +379,268 @@ namespace dxvk {
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}
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void DxvkShader::emitOutputSwizzles(
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SpirvCodeBuffer& code,
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uint32_t outputMask,
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const VkComponentMapping* swizzles) {
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// Skip this step entirely if all relevant
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// outputs use the identity swizzle
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bool requiresEpilogue = false;
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for (auto index : bit::BitMask(outputMask))
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requiresEpilogue |= !util::isIdentityMapping(swizzles[index]);
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if (!requiresEpilogue)
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return;
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// Gather some information. We need to scan pointer types with
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// the output storage class to find the base vector type, and
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// we need to scan vector types to find the component count.
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uint32_t entryPointId = 0;
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uint32_t functionId = 0;
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size_t epilogueOffset = 0;
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size_t variableOffset = 0;
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struct VarInfo {
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uint32_t varId;
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uint32_t typeId;
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uint32_t location;
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uint32_t componentCount;
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uint32_t componentTypeId;
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};
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struct VarIdInfo {
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uint32_t location;
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};
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struct TypeIdInfo {
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uint32_t componentCount;
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uint32_t baseTypeId;
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};
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union IdInfo {
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VarIdInfo var;
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TypeIdInfo type;
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};
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// Stores type information depending on type category:
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// OpTypePointer: type id -> base type id
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// OpTypeVector: type id -> component count
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// OpTypeFloat/Int: type id -> 1
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std::unordered_map<uint32_t, IdInfo> idInfo;
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std::vector<VarInfo> varInfos;
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SpirvInstruction prev;
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for (auto ins : code) {
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switch (ins.opCode()) {
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case spv::OpEntryPoint: {
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entryPointId = ins.arg(2);
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} break;
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case spv::OpDecorate: {
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if (ins.arg(2) == spv::DecorationLocation) {
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IdInfo info;
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info.var.location = ins.arg(3);
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idInfo.insert({ ins.arg(1), info });
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}
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} break;
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case spv::OpTypeVector: {
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IdInfo info;
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info.type.componentCount = ins.arg(3);
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info.type.baseTypeId = ins.arg(2);
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idInfo.insert({ ins.arg(1), info });
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} break;
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case spv::OpTypeInt:
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case spv::OpTypeFloat: {
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IdInfo info;
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info.type.componentCount = 1;
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info.type.baseTypeId = 0;
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idInfo.insert({ ins.arg(1), info });
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} break;
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case spv::OpTypePointer: {
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if (ins.arg(2) == spv::StorageClassOutput) {
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IdInfo info;
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info.type.componentCount = 0;
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info.type.baseTypeId = ins.arg(3);
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idInfo.insert({ ins.arg(1), info });
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}
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} break;
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case spv::OpVariable: {
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if (!variableOffset)
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variableOffset = ins.offset();
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if (ins.arg(3) == spv::StorageClassOutput) {
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uint32_t ptrId = ins.arg(1);
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uint32_t varId = ins.arg(2);
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auto ptrEntry = idInfo.find(ptrId);
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auto varEntry = idInfo.find(varId);
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if (ptrEntry != idInfo.end()
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&& varEntry != idInfo.end()) {
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uint32_t typeId = ptrEntry->second.type.baseTypeId;
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auto typeEntry = idInfo.find(typeId);
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if (typeEntry != idInfo.end()) {
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VarInfo info;
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info.varId = varId;
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info.typeId = typeId;
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info.location = varEntry->second.var.location;
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info.componentCount = typeEntry->second.type.componentCount;
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info.componentTypeId = (info.componentCount == 1)
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? typeId : typeEntry->second.type.baseTypeId;
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varInfos.push_back(info);
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}
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}
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}
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} break;
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case spv::OpFunction: {
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functionId = ins.arg(2);
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} break;
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case spv::OpFunctionEnd: {
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if (entryPointId == functionId)
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epilogueOffset = prev.offset();
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} break;
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default:
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prev = ins;
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}
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if (epilogueOffset)
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break;
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}
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// Oops, this shouldn't happen
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if (!epilogueOffset)
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return;
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code.beginInsertion(epilogueOffset);
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struct ConstInfo {
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uint32_t constId;
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uint32_t typeId;
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uint32_t value;
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};
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std::vector<ConstInfo> consts;
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for (const auto& var : varInfos) {
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uint32_t storeId = 0;
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if (var.componentCount == 1) {
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if (util::getComponentIndex(swizzles[var.location].r, 0) != 0) {
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storeId = code.allocId();
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ConstInfo constInfo;
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constInfo.constId = storeId;
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constInfo.typeId = var.componentTypeId;
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constInfo.value = 0;
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consts.push_back(constInfo);
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}
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} else {
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uint32_t constId = 0;
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std::array<uint32_t, 4> indices = {{
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util::getComponentIndex(swizzles[var.location].r, 0),
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util::getComponentIndex(swizzles[var.location].g, 1),
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util::getComponentIndex(swizzles[var.location].b, 2),
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util::getComponentIndex(swizzles[var.location].a, 3),
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}};
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bool needsSwizzle = false;
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for (uint32_t i = 0; i < var.componentCount && !constId; i++) {
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needsSwizzle |= indices[i] != i;
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if (indices[i] >= var.componentCount)
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constId = code.allocId();
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}
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if (needsSwizzle) {
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uint32_t loadId = code.allocId();
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code.putIns(spv::OpLoad, 4);
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code.putWord(var.typeId);
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code.putWord(loadId);
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code.putWord(var.varId);
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if (!constId) {
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storeId = code.allocId();
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code.putIns(spv::OpVectorShuffle, 5 + var.componentCount);
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code.putWord(var.typeId);
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code.putWord(storeId);
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code.putWord(loadId);
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code.putWord(loadId);
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for (uint32_t i = 0; i < var.componentCount; i++)
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code.putWord(indices[i]);
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} else {
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std::array<uint32_t, 4> ids = { };
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ConstInfo constInfo;
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constInfo.constId = constId;
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constInfo.typeId = var.componentTypeId;
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constInfo.value = 0;
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consts.push_back(constInfo);
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for (uint32_t i = 0; i < var.componentCount; i++) {
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if (indices[i] < var.componentCount) {
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ids[i] = code.allocId();
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code.putIns(spv::OpCompositeExtract, 5);
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code.putWord(var.componentTypeId);
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code.putWord(ids[i]);
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code.putWord(loadId);
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code.putWord(indices[i]);
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} else {
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ids[i] = constId;
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}
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}
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storeId = code.allocId();
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code.putIns(spv::OpCompositeConstruct, 3 + var.componentCount);
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code.putWord(var.typeId);
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code.putWord(storeId);
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for (uint32_t i = 0; i < var.componentCount; i++)
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code.putWord(ids[i]);
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}
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}
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}
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if (storeId) {
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code.putIns(spv::OpStore, 3);
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code.putWord(var.varId);
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code.putWord(storeId);
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}
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}
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code.endInsertion();
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// If necessary, insert constants
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if (!consts.empty()) {
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code.beginInsertion(variableOffset);
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for (const auto& c : consts) {
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code.putIns(spv::OpConstant, 4);
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code.putWord(c.typeId);
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code.putWord(c.constId);
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code.putWord(c.value);
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}
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code.endInsertion();
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}
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}
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DxvkShaderStageInfo::DxvkShaderStageInfo(const DxvkDevice* device)
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: m_device(device) {
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@ -80,6 +80,8 @@ namespace dxvk {
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struct DxvkShaderModuleCreateInfo {
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bool fsDualSrcBlend = false;
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uint32_t undefinedInputs = 0;
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std::array<VkComponentMapping, MaxNumRenderTargets> rtSwizzles = { };
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};
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@ -227,7 +229,14 @@ namespace dxvk {
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DxvkBindingLayout m_bindings;
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static void eliminateInput(SpirvCodeBuffer& code, uint32_t location);
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static void eliminateInput(
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SpirvCodeBuffer& code,
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uint32_t location);
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static void emitOutputSwizzles(
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SpirvCodeBuffer& code,
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uint32_t outputMask,
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const VkComponentMapping* swizzles);
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};
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