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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 void rewriteOffsetToCurrentByte(raw_svector_ostream &Stream,
uint32_t Offset) {
uint32_t Value =
support::endian::byte_swap<uint32_t, llvm::endianness::little>(
Stream.tell());
Stream.pwrite(reinterpret_cast<const char *>(&Value), sizeof(Value), Offset);
}
size_t RootSignatureDesc::getSize() const {
size_t Size =
sizeof(dxbc::RTS0::v1::RootSignatureHeader) +
ParametersContainer.size() * sizeof(dxbc::RTS0::v1::RootParameterHeader) +
StaticSamplers.size() * sizeof(dxbc::RTS0::v1::StaticSampler);
for (const RootParameterInfo &I : ParametersContainer) {
switch (I.Header.ParameterType) {
case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
Size += sizeof(dxbc::RTS0::v1::RootConstants);
break;
case llvm::to_underlying(dxbc::RootParameterType::CBV):
case llvm::to_underlying(dxbc::RootParameterType::SRV):
case llvm::to_underlying(dxbc::RootParameterType::UAV):
if (Version == 1)
Size += sizeof(dxbc::RTS0::v1::RootDescriptor);
else
Size += sizeof(dxbc::RTS0::v2::RootDescriptor);
break;
case llvm::to_underlying(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
Size += 2 * sizeof(uint32_t);
if (Version == 1)
Size += sizeof(dxbc::RTS0::v1::DescriptorRange) * Table.Ranges.size();
else
Size += sizeof(dxbc::RTS0::v2::DescriptorRange) * Table.Ranges.size();
break;
}
}
return Size;
}
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 = StaticSamplersOffset;
if (NumSamplers > 0)
SSO = writePlaceholder(BOS);
else
support::endian::write(BOS, SSO, llvm::endianness::little);
support::endian::write(BOS, Flags, llvm::endianness::little);
SmallVector<uint32_t> ParamsOffsets;
for (const RootParameterInfo &P : ParametersContainer) {
support::endian::write(BOS, P.Header.ParameterType,
llvm::endianness::little);
support::endian::write(BOS, P.Header.ShaderVisibility,
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 auto &[Type, Loc] = ParametersContainer.getTypeAndLocForParameter(I);
switch (Type) {
case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit): {
const dxbc::RTS0::v1::RootConstants &Constants =
ParametersContainer.getConstant(Loc);
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 llvm::to_underlying(dxbc::RootParameterType::CBV):
case llvm::to_underlying(dxbc::RootParameterType::SRV):
case llvm::to_underlying(dxbc::RootParameterType::UAV): {
const dxbc::RTS0::v2::RootDescriptor &Descriptor =
ParametersContainer.getRootDescriptor(Loc);
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 llvm::to_underlying(dxbc::RootParameterType::DescriptorTable): {
const DescriptorTable &Table =
ParametersContainer.getDescriptorTable(Loc);
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, 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;
}
}
}
if (NumSamplers > 0) {
rewriteOffsetToCurrentByte(BOS, SSO);
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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