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[dxbc] Make emitRawBufferLoad more readable

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Philip Rebohle 2018-09-06 21:44:53 +02:00
parent 57e5b05f32
commit 108a6645e6
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GPG Key ID: C8CC613427A31C99
1 changed files with 59 additions and 55 deletions
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114
src/dxbc/dxbc_compiler.cpp
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@ -4628,76 +4628,80 @@ namespace dxvk {
// Shared memory is the only type of buffer that
// is not accessed through a texel buffer view
const bool isTgsm = operand.type == DxbcOperandType::ThreadGroupSharedMemory;
bool isTgsm = operand.type == DxbcOperandType::ThreadGroupSharedMemory;
const uint32_t bufferId = isTgsm
? 0 : m_module.opLoad(bufferInfo.typeId, bufferInfo.varId);
// Common types and IDs used while loading the data
uint32_t bufferId = isTgsm ? 0 : m_module.opLoad(bufferInfo.typeId, bufferInfo.varId);
uint32_t vectorTypeId = getVectorTypeId({ DxbcScalarType::Uint32, 4 });
uint32_t scalarTypeId = getVectorTypeId({ DxbcScalarType::Uint32, 1 });
// Since all data is represented as a sequence of 32-bit
// integers, we have to load each component individually.
std::array<uint32_t, 4> componentIds = { 0, 0, 0, 0 };
std::array<uint32_t, 4> swizzleIds = { 0, 0, 0, 0 };
uint32_t componentIndex = 0;
const uint32_t vectorTypeId = getVectorTypeId({ DxbcScalarType::Uint32, 4 });
const uint32_t scalarTypeId = getVectorTypeId({ DxbcScalarType::Uint32, 1 });
std::array<uint32_t, 4> ccomps = { 0, 0, 0, 0 };
std::array<uint32_t, 4> scomps = { 0, 0, 0, 0 };
uint32_t scount = 0;
for (uint32_t i = 0; i < 4; i++) {
// We'll apply both the write mask and the source operand swizzle
// immediately. Unused components are not loaded, and the scalar
// IDs are written to the array in the order they are requested.
if (writeMask[i]) {
const uint32_t swizzleIndex = operand.swizzle[i];
uint32_t sindex = operand.swizzle[i];
if (!writeMask[i])
continue;
if (ccomps[sindex] == 0) {
uint32_t elementIndexAdjusted = m_module.opIAdd(
getVectorTypeId(elementIndex.type), elementIndex.id,
m_module.consti32(sindex));
if (componentIds[swizzleIndex] == 0) {
// Add the component offset to the element index
const uint32_t elementIndexAdjusted = m_module.opIAdd(
getVectorTypeId(elementIndex.type), elementIndex.id,
m_module.consti32(swizzleIndex));
// Load requested component from the buffer
uint32_t zero = 0;
switch (operand.type) {
case DxbcOperandType::Resource:
ccomps[sindex] = m_module.opCompositeExtract(scalarTypeId,
m_module.opImageFetch(vectorTypeId,
bufferId, elementIndexAdjusted,
SpirvImageOperands()), 1, &zero);
break;
// Load requested component from the buffer
componentIds[swizzleIndex] = [&] {
const uint32_t zero = 0;
case DxbcOperandType::UnorderedAccessView:
ccomps[sindex] = m_module.opCompositeExtract(scalarTypeId,
m_module.opImageRead(vectorTypeId,
bufferId, elementIndexAdjusted,
SpirvImageOperands()), 1, &zero);
break;
case DxbcOperandType::ThreadGroupSharedMemory:
ccomps[sindex] = m_module.opLoad(scalarTypeId,
m_module.opAccessChain(bufferInfo.typeId,
bufferInfo.varId, 1, &elementIndexAdjusted));
break;
switch (operand.type) {
case DxbcOperandType::Resource:
return m_module.opCompositeExtract(scalarTypeId,
m_module.opImageFetch(vectorTypeId,
bufferId, elementIndexAdjusted,
SpirvImageOperands()), 1, &zero);
case DxbcOperandType::UnorderedAccessView:
return m_module.opCompositeExtract(scalarTypeId,
m_module.opImageRead(vectorTypeId,
bufferId, elementIndexAdjusted,
SpirvImageOperands()), 1, &zero);
case DxbcOperandType::ThreadGroupSharedMemory:
return m_module.opLoad(scalarTypeId,
m_module.opAccessChain(bufferInfo.typeId,
bufferInfo.varId, 1, &elementIndexAdjusted));
default:
throw DxvkError("DxbcCompiler: Invalid operand type for strucured/raw load");
}
}();
default:
throw DxvkError("DxbcCompiler: Invalid operand type for strucured/raw load");
}
// Append current component to the list of scalar IDs.
// These will be used to construct the resulting vector.
swizzleIds[componentIndex++] = componentIds[swizzleIndex];
}
}
for (uint32_t i = 0; i < 4; i++) {
uint32_t sindex = operand.swizzle[i];
if (writeMask[i])
scomps[scount++] = ccomps[sindex];
}
// Create result vector
DxbcRegisterValue result;
result.type.ctype = DxbcScalarType::Uint32;
result.type.ccount = writeMask.popCount();
result.id = result.type.ccount > 1
? m_module.opCompositeConstruct(getVectorTypeId(result.type),
result.type.ccount, swizzleIds.data())
: swizzleIds[0];
result.type.ccount = scount;
result.id = scomps[0];
if (scount > 1) {
result.id = m_module.opCompositeConstruct(
getVectorTypeId(result.type),
scount, scomps.data());
}
return result;
}