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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/DeviceD3D12.h"
#include "dawn_native/d3d12/PlatformFunctions.h"
using Microsoft::WRL::ComPtr;
namespace dawn_native { namespace d3d12 {
PipelineLayout::PipelineLayout(Device* device, const PipelineLayoutDescriptor* descriptor)
: PipelineLayoutBase(device, descriptor) {
D3D12_ROOT_PARAMETER rootParameters[kMaxBindGroups * 2];
// 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++;
}
}
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;
ASSERT_SUCCESS(device->GetFunctions()->d3d12SerializeRootSignature(
&rootSignatureDescriptor, D3D_ROOT_SIGNATURE_VERSION_1, &signature, &error));
ASSERT_SUCCESS(device->GetD3D12Device()->CreateRootSignature(
0, signature->GetBufferPointer(), signature->GetBufferSize(),
IID_PPV_ARGS(&mRootSignature)));
}
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() {
return mRootSignature;
}
}} // namespace dawn_native::d3d12