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// Copyright 2017 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "dawn_native/d3d12/PipelineLayoutD3D12.h"
#include "common/Assert.h"
#include "common/BitSetIterator.h"
#include "dawn_native/d3d12/BindGroupLayoutD3D12.h"
#include "dawn_native/d3d12/D3D12Error.h"
#include "dawn_native/d3d12/DeviceD3D12.h"
#include "dawn_native/d3d12/PlatformFunctions.h"
using Microsoft::WRL::ComPtr;
namespace dawn_native { namespace d3d12 {
namespace {
D3D12_SHADER_VISIBILITY ShaderVisibilityType(wgpu::ShaderStage visibility) {
ASSERT(visibility != wgpu::ShaderStage::None);
if (visibility == wgpu::ShaderStage::Vertex) {
return D3D12_SHADER_VISIBILITY_VERTEX;
}
if (visibility == wgpu::ShaderStage::Fragment) {
return D3D12_SHADER_VISIBILITY_PIXEL;
}
// For compute or any two combination of stages, visibility must be ALL
return D3D12_SHADER_VISIBILITY_ALL;
}
D3D12_ROOT_PARAMETER_TYPE RootParameterType(wgpu::BindingType type) {
switch (type) {
case wgpu::BindingType::UniformBuffer:
return D3D12_ROOT_PARAMETER_TYPE_CBV;
case wgpu::BindingType::StorageBuffer:
return D3D12_ROOT_PARAMETER_TYPE_UAV;
case wgpu::BindingType::ReadonlyStorageBuffer:
return D3D12_ROOT_PARAMETER_TYPE_SRV;
case wgpu::BindingType::SampledTexture:
case wgpu::BindingType::Sampler:
case wgpu::BindingType::StorageTexture:
case wgpu::BindingType::ReadonlyStorageTexture:
case wgpu::BindingType::WriteonlyStorageTexture:
UNREACHABLE();
}
}
} // anonymous namespace
ResultOrError<PipelineLayout*> PipelineLayout::Create(
Device* device,
const PipelineLayoutDescriptor* descriptor) {
Ref<PipelineLayout> layout = AcquireRef(new PipelineLayout(device, descriptor));
DAWN_TRY(layout->Initialize());
return layout.Detach();
}
MaybeError PipelineLayout::Initialize() {
Device* device = ToBackend(GetDevice());
D3D12_ROOT_PARAMETER rootParameters[kMaxBindGroups * 2 + kMaxDynamicBufferCount];
// A root parameter is one of these types
union {
D3D12_ROOT_DESCRIPTOR_TABLE DescriptorTable;
D3D12_ROOT_CONSTANTS Constants;
D3D12_ROOT_DESCRIPTOR Descriptor;
} rootParameterValues[kMaxBindGroups * 2];
// samplers must be in a separate descriptor table so we need at most twice as many tables
// as bind groups
// Ranges are D3D12_DESCRIPTOR_RANGE_TYPE_(SRV|UAV|CBV|SAMPLER)
// They are grouped together so each bind group has at most 4 ranges
D3D12_DESCRIPTOR_RANGE ranges[kMaxBindGroups * 4];
uint32_t parameterIndex = 0;
uint32_t rangeIndex = 0;
for (uint32_t group : IterateBitSet(GetBindGroupLayoutsMask())) {
const BindGroupLayout* bindGroupLayout = ToBackend(GetBindGroupLayout(group));
// Set the root descriptor table parameter and copy ranges. Ranges are offset by the
// bind group index Returns whether or not the parameter was set. A root parameter is
// not set if the number of ranges is 0
auto SetRootDescriptorTable =
[&](uint32_t rangeCount, const D3D12_DESCRIPTOR_RANGE* descriptorRanges) -> bool {
if (rangeCount == 0) {
return false;
}
auto& rootParameter = rootParameters[parameterIndex];
rootParameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
rootParameter.DescriptorTable = rootParameterValues[parameterIndex].DescriptorTable;
rootParameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_ALL;
rootParameter.DescriptorTable.NumDescriptorRanges = rangeCount;
rootParameter.DescriptorTable.pDescriptorRanges = &ranges[rangeIndex];
for (uint32_t i = 0; i < rangeCount; ++i) {
ranges[rangeIndex] = descriptorRanges[i];
ranges[rangeIndex].RegisterSpace = group;
rangeIndex++;
}
return true;
};
if (SetRootDescriptorTable(bindGroupLayout->GetCbvUavSrvDescriptorTableSize(),
bindGroupLayout->GetCbvUavSrvDescriptorRanges())) {
mCbvUavSrvRootParameterInfo[group] = parameterIndex++;
}
if (SetRootDescriptorTable(bindGroupLayout->GetSamplerDescriptorTableSize(),
bindGroupLayout->GetSamplerDescriptorRanges())) {
mSamplerRootParameterInfo[group] = parameterIndex++;
}
// Get calculated shader register for root descriptors
const auto& shaderRegisters = bindGroupLayout->GetBindingOffsets();
// Init root descriptors in root signatures for dynamic buffer bindings.
// These are packed at the beginning of the layout binding info.
for (BindingIndex dynamicBindingIndex = 0;
dynamicBindingIndex < bindGroupLayout->GetDynamicBufferCount();
++dynamicBindingIndex) {
const BindingInfo& bindingInfo =
bindGroupLayout->GetBindingInfo(dynamicBindingIndex);
D3D12_ROOT_PARAMETER* rootParameter = &rootParameters[parameterIndex];
// Setup root descriptor.
D3D12_ROOT_DESCRIPTOR rootDescriptor;
rootDescriptor.ShaderRegister = shaderRegisters[dynamicBindingIndex];
rootDescriptor.RegisterSpace = group;
// Set root descriptors in root signatures.
rootParameter->Descriptor = rootDescriptor;
mDynamicRootParameterIndices[group][dynamicBindingIndex] = parameterIndex++;
// Set parameter types according to bind group layout descriptor.
rootParameter->ParameterType = RootParameterType(bindingInfo.type);
// Set visibilities according to bind group layout descriptor.
rootParameter->ShaderVisibility = ShaderVisibilityType(bindingInfo.visibility);
}
}
D3D12_ROOT_SIGNATURE_DESC rootSignatureDescriptor;
rootSignatureDescriptor.NumParameters = parameterIndex;
rootSignatureDescriptor.pParameters = rootParameters;
rootSignatureDescriptor.NumStaticSamplers = 0;
rootSignatureDescriptor.pStaticSamplers = nullptr;
rootSignatureDescriptor.Flags =
D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT;
ComPtr<ID3DBlob> signature;
ComPtr<ID3DBlob> error;
DAWN_TRY(CheckHRESULT(
device->GetFunctions()->d3d12SerializeRootSignature(
&rootSignatureDescriptor, D3D_ROOT_SIGNATURE_VERSION_1, &signature, &error),
"D3D12 serialize root signature"));
DAWN_TRY(CheckHRESULT(device->GetD3D12Device()->CreateRootSignature(
0, signature->GetBufferPointer(), signature->GetBufferSize(),
IID_PPV_ARGS(&mRootSignature)),
"D3D12 create root signature"));
return {};
}
uint32_t PipelineLayout::GetCbvUavSrvRootParameterIndex(uint32_t group) const {
ASSERT(group < kMaxBindGroups);
return mCbvUavSrvRootParameterInfo[group];
}
uint32_t PipelineLayout::GetSamplerRootParameterIndex(uint32_t group) const {
ASSERT(group < kMaxBindGroups);
return mSamplerRootParameterInfo[group];
}
ComPtr<ID3D12RootSignature> PipelineLayout::GetRootSignature() const {
return mRootSignature;
}
uint32_t PipelineLayout::GetDynamicRootParameterIndex(uint32_t group,
BindingIndex bindingIndex) const {
ASSERT(group < kMaxBindGroups);
ASSERT(bindingIndex < kMaxBindingsPerGroup);
ASSERT(GetBindGroupLayout(group)->GetBindingInfo(bindingIndex).hasDynamicOffset);
return mDynamicRootParameterIndices[group][bindingIndex];
}
}} // namespace dawn_native::d3d12