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#include "slang-ir-legalize-image-subscript.h"
#include "slang-ir-clone.h"
#include "slang-ir-insts.h"
#include "slang-ir-legalize-varying-params.h"
#include "slang-ir-specialize-address-space.h"
#include "slang-ir-util.h"
#include "slang-ir.h"
#include "slang-parameter-binding.h"
namespace Slang
{
void legalizeStore(
TargetRequest* target,
IRBuilder& builder,
IRInst* storeInst,
DiagnosticSink* sink)
{
SLANG_ASSERT(storeInst);
builder.setInsertBefore(storeInst);
auto getElementPtr = as<IRGetElementPtr>(storeInst->getOperand(0));
IRImageSubscript* imageSubscript = as<IRImageSubscript>(getRootAddr(storeInst->getOperand(0)));
SLANG_ASSERT(imageSubscript);
SLANG_ASSERT(imageSubscript->getImage());
IRTextureType* textureType = as<IRTextureType>(imageSubscript->getImage()->getFullType());
SLANG_ASSERT(textureType);
auto imageElementType = cast<IRPtrTypeBase>(imageSubscript->getDataType())->getValueType();
auto vectorBaseType = getIRVectorBaseType(imageElementType);
IRType* vector4Type = builder.getVectorType(vectorBaseType, 4);
IRType* coordType = imageSubscript->getCoord()->getDataType();
int coordVectorSize = getIRVectorElementSize(coordType);
bool seperateArrayCoord =
(isMetalTarget(target) && textureType->isArray()); // seperate array param
bool seperateSampleCoord = (textureType->isMultisample()); // seperate sample param
if (seperateSampleCoord && isMetalTarget(target))
sink->diagnose(
imageSubscript->getImage(),
Diagnostics::multiSampledTextureDoesNotAllowWrites,
target->getTarget());
IRType* indexingType = builder.getIntType();
if (isMetalTarget(target))
indexingType = builder.getUIntType();
if (coordVectorSize != 1)
{
coordType = builder.getVectorType(
indexingType,
builder.getIntValue(builder.getIntType(), coordVectorSize));
}
else
{
coordType = indexingType;
}
auto legalizedCoord = imageSubscript->getCoord();
if (coordType != imageSubscript->getCoord()->getDataType())
{
legalizedCoord = builder.emitCast(coordType, legalizedCoord);
}
const Index kCoordParamIndex = 1;
const Index kValueParamIndex = 2;
ShortList<IRInst*> loadParams;
loadParams.reserveOverflowBuffer(4);
loadParams.add(imageSubscript->getImage()); // image
loadParams.add(legalizedCoord); // coord
ShortList<IRInst*> storeParams;
storeParams.reserveOverflowBuffer(5);
storeParams.add(imageSubscript->getImage()); // image
storeParams.add(legalizedCoord); // coord
storeParams.add(nullptr); // value
if (seperateArrayCoord)
{
UInt paramIndexToFetch = coordVectorSize - 1;
auto seperatedParam =
builder.emitSwizzle(indexingType, legalizedCoord, 1, ¶mIndexToFetch);
loadParams.add(seperatedParam);
storeParams.add(seperatedParam);
coordVectorSize -= 1;
ShortList<UInt> paramToFetch;
paramToFetch.reserveOverflowBuffer(coordVectorSize);
for (int i = 0; i < coordVectorSize; i++)
{
paramToFetch.add(i);
}
auto newCoord = builder.emitSwizzle(
builder.getVectorType(
indexingType,
builder.getIntValue(builder.getIntType(), coordVectorSize)),
legalizedCoord,
coordVectorSize,
paramToFetch.getArrayView().getBuffer());
storeParams[kCoordParamIndex] = newCoord;
loadParams[kCoordParamIndex] = newCoord;
}
if (seperateSampleCoord)
{
loadParams.add(imageSubscript->getSampleCoord());
storeParams.add(imageSubscript->getSampleCoord());
}
IRInst* legalizedStore = storeInst->getOperand(1);
switch (storeInst->getOp())
{
case kIROp_Store:
{
IRInst* newValue = nullptr;
if (getElementPtr)
{
auto originalValue = builder.emitImageLoad(vector4Type, loadParams);
auto index = getElementPtr->getIndex();
newValue =
builder.emitSwizzleSet(vector4Type, originalValue, legalizedStore, 1, &index);
}
else
{
newValue = legalizedStore;
if (getIRVectorElementSize(imageElementType) != 4)
{
newValue = builder.emitVectorReshape(
builder.getVectorType(
vectorBaseType,
builder.getIntValue(builder.getIntType(), 4)),
newValue);
}
}
storeParams[kValueParamIndex] = newValue;
auto imageStore = builder.emitImageStore(builder.getVoidType(), storeParams);
storeInst->replaceUsesWith(imageStore);
storeInst->removeAndDeallocate();
if (!imageSubscript->hasUses())
{
imageSubscript->removeAndDeallocate();
}
}
break;
case kIROp_SwizzledStore:
{
auto swizzledStore = cast<IRSwizzledStore>(storeInst);
// Here we assume the imageElementType is already lowered into float4/uint4 types from
// any user-defined type.
assert(imageElementType->getOp() == kIROp_VectorType);
auto originalValue = builder.emitImageLoad(vector4Type, loadParams);
Array<IRInst*, 4> indices;
for (UInt i = 0; i < swizzledStore->getElementCount(); i++)
{
indices.add(swizzledStore->getElementIndex(i));
}
auto newValue = builder.emitSwizzleSet(
vector4Type,
originalValue,
swizzledStore->getSource(),
swizzledStore->getElementCount(),
indices.getBuffer());
storeParams[kValueParamIndex] = newValue;
auto imageStore = builder.emitImageStore(builder.getVoidType(), storeParams);
storeInst->replaceUsesWith(imageStore);
storeInst->removeAndDeallocate();
if (!imageSubscript->hasUses())
{
imageSubscript->removeAndDeallocate();
}
}
break;
default:
break;
}
}
void legalizeImageSubscript(TargetRequest* target, IRModule* module, DiagnosticSink* sink)
{
IRBuilder builder(module);
for (auto globalInst : module->getModuleInst()->getChildren())
{
auto func = as<IRFunc>(globalInst);
if (!func)
continue;
for (auto block : func->getBlocks())
{
auto inst = block->getFirstInst();
IRInst* next;
for (; inst; inst = next)
{
next = inst->getNextInst();
switch (inst->getOp())
{
case kIROp_Store:
case kIROp_SwizzledStore:
if (as<IRImageSubscript>(getRootAddr(inst->getOperand(0))))
legalizeStore(target, builder, inst, sink);
continue;
}
}
}
}
}
} // namespace Slang
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