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#include "slang-ir-lower-combined-texture-sampler.h"
#include "slang-ir-insts.h"
#include "slang-ir-util.h"
#include "slang-ir-layout.h"
namespace Slang
{
struct LoweredCombinedSamplerStructInfo
{
IRStructKey* texture;
IRStructKey* sampler;
IRStructType* type;
IRType* samplerType;
IRType* textureType;
IRTypeLayout* typeLayout;
};
struct LowerCombinedSamplerContext
{
Dictionary<IRType*, LoweredCombinedSamplerStructInfo> mapTypeToLoweredInfo;
LoweredCombinedSamplerStructInfo lowerCombinedTextureSamplerType(IRTextureTypeBase* textureType)
{
if (auto loweredInfo = mapTypeToLoweredInfo.tryGetValue(textureType))
return *loweredInfo;
LoweredCombinedSamplerStructInfo info;
IRBuilder builder(textureType);
builder.setInsertBefore(textureType);
auto structType = builder.createStructType();
StringBuilder sb;
getTypeNameHint(sb, textureType);
builder.addNameHintDecoration(structType, sb.getUnownedSlice());
info.sampler = builder.createStructKey();
builder.addNameHintDecoration(info.sampler, toSlice("sampler"));
info.texture = builder.createStructKey();
builder.addNameHintDecoration(info.texture, toSlice("texture"));
info.type = structType;
bool isMutable = getIntVal(textureType->getAccessInst()) == kStdlibResourceAccessReadOnly ? false : true;
info.textureType = builder.getTextureType(textureType->getElementType(),
textureType->getShapeInst(),
textureType->getIsArrayInst(),
textureType->getIsMultisampleInst(),
textureType->getSampleCountInst(),
textureType->getAccessInst(),
textureType->getIsShadowInst(),
builder.getIntValue(builder.getIntType(), 0),
textureType->getFormatInst());
builder.createStructField(structType, info.texture, info.textureType);
if (getIntVal(textureType->getIsShadowInst()) != 0)
info.samplerType = builder.getType(kIROp_SamplerComparisonStateType);
else
info.samplerType = builder.getType(kIROp_SamplerStateType);
builder.createStructField(structType, info.sampler, info.samplerType);
// Type layout.
auto textureResourceKind = isMutable ? LayoutResourceKind::UnorderedAccess : LayoutResourceKind::ShaderResource;
IRTypeLayout::Builder textureTypeLayoutBuilder(&builder);
textureTypeLayoutBuilder.addResourceUsage(
textureResourceKind,
LayoutSize(1));
auto textureTypeLayout = textureTypeLayoutBuilder.build();
IRTypeLayout::Builder samplerTypeLayoutBuilder(&builder);
samplerTypeLayoutBuilder.addResourceUsage(
LayoutResourceKind::SamplerState,
LayoutSize(1));
auto samplerTypeLayout = samplerTypeLayoutBuilder.build();
IRVarLayout::Builder textureVarLayoutBuilder(&builder, textureTypeLayout);
textureVarLayoutBuilder.findOrAddResourceInfo(textureResourceKind)->offset = 0;
auto textureVarLayout = textureVarLayoutBuilder.build();
IRVarLayout::Builder samplerVarLayoutBuilder(&builder, samplerTypeLayout);
samplerVarLayoutBuilder.findOrAddResourceInfo(LayoutResourceKind::SamplerState)->offset = 0;
auto samplerVarLayout = samplerVarLayoutBuilder.build();
IRStructTypeLayout::Builder layoutBuilder(&builder);
layoutBuilder.addField(info.texture, textureVarLayout);
layoutBuilder.addField(info.sampler, samplerVarLayout);
info.typeLayout = layoutBuilder.build();
builder.addLayoutDecoration(structType, info.typeLayout);
mapTypeToLoweredInfo.add(textureType, info);
return info;
}
};
void lowerCombinedTextureSamplers(
IRModule* module,
DiagnosticSink* sink)
{
SLANG_UNUSED(sink);
LowerCombinedSamplerContext context;
// Lower combined texture sampler type into a struct type.
for (auto globalInst : module->getGlobalInsts())
{
auto textureType = as<IRTextureTypeBase>(globalInst);
if (!textureType || getIntVal(textureType->getIsCombinedInst()) == 0)
continue;
auto typeInfo = context.lowerCombinedTextureSamplerType(textureType);
for (auto use = textureType->firstUse; use; use = use->nextUse)
{
auto typeUser = use->getUser();
if (use != &typeUser->typeUse)
continue;
auto layoutDecor = typeUser->findDecoration<IRLayoutDecoration>();
if (!layoutDecor)
continue;
// Replace the original VarLayout with the new StructTypeVarLayout.
auto varLayout = as<IRVarLayout>(layoutDecor->getLayout());
if (!varLayout)
continue;
IRBuilder subBuilder(typeUser);
IRVarLayout::Builder newVarLayoutBuilder(&subBuilder, typeInfo.typeLayout);
newVarLayoutBuilder.cloneEverythingButOffsetsFrom(varLayout);
IRVarOffsetAttr* resOffsetAttr = nullptr;
IRVarOffsetAttr* descriptorTableSlotOffsetAttr = nullptr;
for (auto offsetAttr : varLayout->getOffsetAttrs())
{
if (offsetAttr->getResourceKind() == LayoutResourceKind::UnorderedAccess ||
offsetAttr->getResourceKind() == LayoutResourceKind::ShaderResource)
resOffsetAttr = offsetAttr;
else if (offsetAttr->getResourceKind() == LayoutResourceKind::DescriptorTableSlot)
descriptorTableSlotOffsetAttr = offsetAttr;
auto info = newVarLayoutBuilder.findOrAddResourceInfo(offsetAttr->getResourceKind());
info->offset = offsetAttr->getOffset();
info->space = offsetAttr->getSpace();
info->kind = offsetAttr->getResourceKind();
}
// If the user provided an layout offset for the texture but not for descriptor table slot, then
// we use the texture offset for the descriptor table slot offset.
if (resOffsetAttr && !descriptorTableSlotOffsetAttr)
{
auto info = newVarLayoutBuilder.findOrAddResourceInfo(LayoutResourceKind::DescriptorTableSlot);
info->offset = resOffsetAttr->getOffset();
info->space = resOffsetAttr->getSpace();
info->kind = LayoutResourceKind::DescriptorTableSlot;
}
auto newVarLayout = newVarLayoutBuilder.build();
subBuilder.addLayoutDecoration(typeUser, newVarLayout);
varLayout->removeAndDeallocate();
}
}
// If no combined texture sampler type exist in the IR module,
// we can exit now.
if (context.mapTypeToLoweredInfo.getCount() == 0)
return;
// We need to process all insts in the module, and replace
// CombinedTextureSamplerGetTexture and CombinedTextureSamplerGetSampler into
// FieldExtracts.
IRBuilder builder(module);
for (auto globalInst : module->getGlobalInsts())
{
auto func = as<IRFunc>(getGenericReturnVal(globalInst));
if (!func)
continue;
for (auto block : func->getBlocks())
{
IRInst* nextInst = nullptr;
for (auto inst = block->getFirstInst(); inst; inst = nextInst)
{
nextInst = inst->getNextInst();
switch (inst->getOp())
{
case kIROp_CombinedTextureSamplerGetTexture:
case kIROp_CombinedTextureSamplerGetSampler:
{
auto combinedSamplerType = inst->getOperand(0)->getDataType();
auto loweredInfo = context.mapTypeToLoweredInfo.tryGetValue(combinedSamplerType);
if (!loweredInfo)
continue;
builder.setInsertBefore(inst);
auto fieldExtract = builder.emitFieldExtract(inst->getFullType(), inst->getOperand(0),
inst->getOp() == kIROp_CombinedTextureSamplerGetSampler ? loweredInfo->sampler : loweredInfo->texture);
inst->replaceUsesWith(fieldExtract);
inst->removeAndDeallocate();
}
break;
}
}
}
}
// Replace all other type use with the lowered struct type.
for (auto typeInfo : context.mapTypeToLoweredInfo)
{
auto loweredInfo = typeInfo.second;
typeInfo.first->replaceUsesWith(loweredInfo.type);
typeInfo.first->removeAndDeallocate();
}
}
}
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