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//===- llvm/MC/DXContainerRootSignature.cpp - RootSignature -*- C++ -*-=======//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/DXContainerRootSignature.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/EndianStream.h"
using namespace llvm;
using namespace llvm::mcdxbc;
static uint32_t writePlaceholder(raw_svector_ostream &Stream) {
const uint32_t DummyValue = std::numeric_limits<uint32_t>::max();
uint32_t Offset = Stream.tell();
support::endian::write(Stream, DummyValue, llvm::endianness::little);
return Offset;
}
static uint32_t rewriteOffsetToCurrentByte(raw_svector_ostream &Stream,
uint32_t Offset) {
uint32_t ByteOffset = Stream.tell();
uint32_t Value =
support::endian::byte_swap<uint32_t, llvm::endianness::little>(
ByteOffset);
Stream.pwrite(reinterpret_cast<const char *>(&Value), sizeof(Value), Offset);
return ByteOffset;
}
size_t RootSignatureDesc::getSize() const {
uint32_t StaticSamplersOffset = computeStaticSamplersOffset();
size_t StaticSamplersSize =
StaticSamplers.size() * sizeof(dxbc::RTS0::v1::StaticSampler);
return size_t(StaticSamplersOffset) + StaticSamplersSize;
}
uint32_t RootSignatureDesc::computeRootParametersOffset() const {
return sizeof(dxbc::RTS0::v1::RootSignatureHeader);
}
uint32_t RootSignatureDesc::computeStaticSamplersOffset() const {
uint32_t Offset = computeRootParametersOffset();
for (const RootParameterInfo &I : ParametersContainer) {
Offset += sizeof(dxbc::RTS0::v1::RootParameterHeader);
switch (I.Type) {
case dxbc::RootParameterType::Constants32Bit:
Offset += sizeof(dxbc::RTS0::v1::RootConstants);
break;
case dxbc::RootParameterType::CBV:
case dxbc::RootParameterType::SRV:
case dxbc::RootParameterType::UAV:
if (Version == 1)
Offset += sizeof(dxbc::RTS0::v1::RootDescriptor);
else
Offset += sizeof(dxbc::RTS0::v2::RootDescriptor);
break;
case dxbc::RootParameterType::DescriptorTable:
const DescriptorTable &Table =
ParametersContainer.getDescriptorTable(I.Location);
// 4 bytes for the number of ranges in table and
// 4 bytes for the ranges offset
Offset += 2 * sizeof(uint32_t);
if (Version == 1)
Offset += sizeof(dxbc::RTS0::v1::DescriptorRange) * Table.Ranges.size();
else
Offset += sizeof(dxbc::RTS0::v2::DescriptorRange) * Table.Ranges.size();
break;
}
}
return Offset;
}
void RootSignatureDesc::write(raw_ostream &OS) const {
SmallString<256> Storage;
raw_svector_ostream BOS(Storage);
BOS.reserveExtraSpace(getSize());
const uint32_t NumParameters = ParametersContainer.size();
const uint32_t NumSamplers = StaticSamplers.size();
support::endian::write(BOS, Version, llvm::endianness::little);
support::endian::write(BOS, NumParameters, llvm::endianness::little);
support::endian::write(BOS, RootParameterOffset, llvm::endianness::little);
support::endian::write(BOS, NumSamplers, llvm::endianness::little);
uint32_t SSO = writePlaceholder(BOS);
support::endian::write(BOS, Flags, llvm::endianness::little);
SmallVector<uint32_t> ParamsOffsets;
for (const RootParameterInfo &I : ParametersContainer) {
support::endian::write(BOS, I.Type, llvm::endianness::little);
support::endian::write(BOS, I.Visibility, llvm::endianness::little);
ParamsOffsets.push_back(writePlaceholder(BOS));
}
assert(NumParameters == ParamsOffsets.size());
for (size_t I = 0; I < NumParameters; ++I) {
rewriteOffsetToCurrentByte(BOS, ParamsOffsets[I]);
const RootParameterInfo &Info = ParametersContainer.getInfo(I);
switch (Info.Type) {
case dxbc::RootParameterType::Constants32Bit: {
const mcdxbc::RootConstants &Constants =
ParametersContainer.getConstant(Info.Location);
support::endian::write(BOS, Constants.ShaderRegister,
llvm::endianness::little);
support::endian::write(BOS, Constants.RegisterSpace,
llvm::endianness::little);
support::endian::write(BOS, Constants.Num32BitValues,
llvm::endianness::little);
break;
}
case dxbc::RootParameterType::CBV:
case dxbc::RootParameterType::SRV:
case dxbc::RootParameterType::UAV: {
const mcdxbc::RootDescriptor &Descriptor =
ParametersContainer.getRootDescriptor(Info.Location);
support::endian::write(BOS, Descriptor.ShaderRegister,
llvm::endianness::little);
support::endian::write(BOS, Descriptor.RegisterSpace,
llvm::endianness::little);
if (Version > 1)
support::endian::write(BOS, Descriptor.Flags, llvm::endianness::little);
break;
}
case dxbc::RootParameterType::DescriptorTable: {
const DescriptorTable &Table =
ParametersContainer.getDescriptorTable(Info.Location);
support::endian::write(BOS, (uint32_t)Table.Ranges.size(),
llvm::endianness::little);
rewriteOffsetToCurrentByte(BOS, writePlaceholder(BOS));
for (const auto &Range : Table) {
support::endian::write(BOS, static_cast<uint32_t>(Range.RangeType),
llvm::endianness::little);
support::endian::write(BOS, Range.NumDescriptors,
llvm::endianness::little);
support::endian::write(BOS, Range.BaseShaderRegister,
llvm::endianness::little);
support::endian::write(BOS, Range.RegisterSpace,
llvm::endianness::little);
if (Version > 1)
support::endian::write(BOS, Range.Flags, llvm::endianness::little);
support::endian::write(BOS, Range.OffsetInDescriptorsFromTableStart,
llvm::endianness::little);
}
break;
}
}
}
[[maybe_unused]] uint32_t Offset = rewriteOffsetToCurrentByte(BOS, SSO);
assert(Offset == computeStaticSamplersOffset() &&
"Computed offset does not match written offset");
for (const auto &S : StaticSamplers) {
support::endian::write(BOS, S.Filter, llvm::endianness::little);
support::endian::write(BOS, S.AddressU, llvm::endianness::little);
support::endian::write(BOS, S.AddressV, llvm::endianness::little);
support::endian::write(BOS, S.AddressW, llvm::endianness::little);
support::endian::write(BOS, S.MipLODBias, llvm::endianness::little);
support::endian::write(BOS, S.MaxAnisotropy, llvm::endianness::little);
support::endian::write(BOS, S.ComparisonFunc, llvm::endianness::little);
support::endian::write(BOS, S.BorderColor, llvm::endianness::little);
support::endian::write(BOS, S.MinLOD, llvm::endianness::little);
support::endian::write(BOS, S.MaxLOD, llvm::endianness::little);
support::endian::write(BOS, S.ShaderRegister, llvm::endianness::little);
support::endian::write(BOS, S.RegisterSpace, llvm::endianness::little);
support::endian::write(BOS, S.ShaderVisibility, llvm::endianness::little);
}
assert(Storage.size() == getSize());
OS.write(Storage.data(), Storage.size());
}
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