src/dawn_native/d3d12/BindGroupD3D12.cpp - dawn - Git at Google

 // 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/BindGroupD3D12.h"

 #include "common/BitSetIterator.h"
 #include "dawn_native/d3d12/BindGroupLayoutD3D12.h"
 #include "dawn_native/d3d12/BufferD3D12.h"
 #include "dawn_native/d3d12/DeviceD3D12.h"
 #include "dawn_native/d3d12/SamplerHeapCacheD3D12.h"
 #include "dawn_native/d3d12/ShaderVisibleDescriptorAllocatorD3D12.h"
 #include "dawn_native/d3d12/TextureD3D12.h"

 namespace dawn_native { namespace d3d12 {

     // static
     ResultOrError<BindGroup*> BindGroup::Create(Device* device,
                                                 const BindGroupDescriptor* descriptor) {
         return ToBackend(descriptor->layout)->AllocateBindGroup(device, descriptor);
     }

     BindGroup::BindGroup(Device* device,
                          const BindGroupDescriptor* descriptor,
                          uint32_t viewSizeIncrement,
                          const CPUDescriptorHeapAllocation& viewAllocation)
         : BindGroupBase(this, device, descriptor) {
         BindGroupLayout* bgl = ToBackend(GetLayout());

         mCPUViewAllocation = viewAllocation;

         const auto& bindingOffsets = bgl->GetBindingOffsets();

         ID3D12Device* d3d12Device = device->GetD3D12Device();

         // It's not necessary to create descriptors in the descriptor heap for dynamic resources.
         // This is because they are created as root descriptors which are never heap allocated.
         // Since dynamic buffers are packed in the front, we can skip over these bindings by
         // starting from the dynamic buffer count.
         for (BindingIndex bindingIndex = bgl->GetDynamicBufferCount();
              bindingIndex < bgl->GetBindingCount(); ++bindingIndex) {
             const BindingInfo& bindingInfo = bgl->GetBindingInfo(bindingIndex);

             // Increment size does not need to be stored and is only used to get a handle
             // local to the allocation with OffsetFrom().
             switch (bindingInfo.type) {
                 case wgpu::BindingType::UniformBuffer: {
                     BufferBinding binding = GetBindingAsBufferBinding(bindingIndex);

                     D3D12_CONSTANT_BUFFER_VIEW_DESC desc;
                     // TODO(enga@google.com): investigate if this needs to be a constraint at
                     // the API level
                     desc.SizeInBytes = Align(binding.size, 256);
                     desc.BufferLocation = ToBackend(binding.buffer)->GetVA() + binding.offset;

                     d3d12Device->CreateConstantBufferView(
                         &desc,
                         viewAllocation.OffsetFrom(viewSizeIncrement, bindingOffsets[bindingIndex]));
                     break;
                 }
                 case wgpu::BindingType::StorageBuffer: {
                     BufferBinding binding = GetBindingAsBufferBinding(bindingIndex);

                     // Since SPIRV-Cross outputs HLSL shaders with RWByteAddressBuffer,
                     // we must use D3D12_BUFFER_UAV_FLAG_RAW when making the
                     // UNORDERED_ACCESS_VIEW_DESC. Using D3D12_BUFFER_UAV_FLAG_RAW requires
                     // that we use DXGI_FORMAT_R32_TYPELESS as the format of the view.
                     // DXGI_FORMAT_R32_TYPELESS requires that the element size be 4
                     // byte aligned. Since binding.size and binding.offset are in bytes,
                     // we need to divide by 4 to obtain the element size.
                     D3D12_UNORDERED_ACCESS_VIEW_DESC desc;
                     desc.Buffer.NumElements = binding.size / 4;
                     desc.Format = DXGI_FORMAT_R32_TYPELESS;
                     desc.ViewDimension = D3D12_UAV_DIMENSION_BUFFER;
                     desc.Buffer.FirstElement = binding.offset / 4;
                     desc.Buffer.StructureByteStride = 0;
                     desc.Buffer.CounterOffsetInBytes = 0;
                     desc.Buffer.Flags = D3D12_BUFFER_UAV_FLAG_RAW;

                     d3d12Device->CreateUnorderedAccessView(
                         ToBackend(binding.buffer)->GetD3D12Resource().Get(), nullptr, &desc,
                         viewAllocation.OffsetFrom(viewSizeIncrement, bindingOffsets[bindingIndex]));
                     break;
                 }
                 case wgpu::BindingType::ReadonlyStorageBuffer: {
                     BufferBinding binding = GetBindingAsBufferBinding(bindingIndex);

                     // Like StorageBuffer, SPIRV-Cross outputs HLSL shaders for readonly storage
                     // buffer with ByteAddressBuffer. So we must use D3D12_BUFFER_SRV_FLAG_RAW
                     // when making the SRV descriptor. And it has similar requirement for
                     // format, element size, etc.
                     D3D12_SHADER_RESOURCE_VIEW_DESC desc;
                     desc.Format = DXGI_FORMAT_R32_TYPELESS;
                     desc.ViewDimension = D3D12_SRV_DIMENSION_BUFFER;
                     desc.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
                     desc.Buffer.FirstElement = binding.offset / 4;
                     desc.Buffer.NumElements = binding.size / 4;
                     desc.Buffer.StructureByteStride = 0;
                     desc.Buffer.Flags = D3D12_BUFFER_SRV_FLAG_RAW;
                     d3d12Device->CreateShaderResourceView(
                         ToBackend(binding.buffer)->GetD3D12Resource().Get(), &desc,
                         viewAllocation.OffsetFrom(viewSizeIncrement, bindingOffsets[bindingIndex]));
                     break;
                 }

                 // Readonly storage is implemented as SRV so it can be used at the same time as a
                 // sampled texture.
                 case wgpu::BindingType::SampledTexture:
                 case wgpu::BindingType::ReadonlyStorageTexture: {
                     auto* view = ToBackend(GetBindingAsTextureView(bindingIndex));
                     auto& srv = view->GetSRVDescriptor();
                     d3d12Device->CreateShaderResourceView(
                         ToBackend(view->GetTexture())->GetD3D12Resource(), &srv,
                         viewAllocation.OffsetFrom(viewSizeIncrement, bindingOffsets[bindingIndex]));
                     break;
                 }
                 case wgpu::BindingType::Sampler:
                 case wgpu::BindingType::ComparisonSampler: {
                     // No-op as samplers will be later initialized by CreateSamplers().
                     break;
                 }

                 case wgpu::BindingType::WriteonlyStorageTexture: {
                     TextureView* view = ToBackend(GetBindingAsTextureView(bindingIndex));
                     D3D12_UNORDERED_ACCESS_VIEW_DESC uav = view->GetUAVDescriptor();
                     d3d12Device->CreateUnorderedAccessView(
                         ToBackend(view->GetTexture())->GetD3D12Resource(), nullptr, &uav,
                         viewAllocation.OffsetFrom(viewSizeIncrement, bindingOffsets[bindingIndex]));
                     break;
                 }

                 case wgpu::BindingType::StorageTexture:
                     UNREACHABLE();
                     break;

                     // TODO(shaobo.yan@intel.com): Implement dynamic buffer offset.
             }
         }
     }

     BindGroup::~BindGroup() {
         ToBackend(GetLayout())->DeallocateBindGroup(this, &mCPUViewAllocation);
         ASSERT(!mCPUViewAllocation.IsValid());
     }

     bool BindGroup::PopulateViews(ShaderVisibleDescriptorAllocator* viewAllocator) {
         const BindGroupLayout* bgl = ToBackend(GetLayout());

         const uint32_t descriptorCount = bgl->GetCbvUavSrvDescriptorCount();
         if (descriptorCount == 0 || viewAllocator->IsAllocationStillValid(mGPUViewAllocation)) {
             return true;
         }

         // Attempt to allocate descriptors for the currently bound shader-visible heaps.
         // If either failed, return early to re-allocate and switch the heaps.
         Device* device = ToBackend(GetDevice());

         D3D12_CPU_DESCRIPTOR_HANDLE baseCPUDescriptor;
         if (!viewAllocator->AllocateGPUDescriptors(descriptorCount,
                                                    device->GetPendingCommandSerial(),
                                                    &baseCPUDescriptor, &mGPUViewAllocation)) {
             return false;
         }

         // CPU bindgroups are sparsely allocated across CPU heaps. Instead of doing
         // simple copies per bindgroup, a single non-simple copy could be issued.
         // TODO(dawn:155): Consider doing this optimization.
         device->GetD3D12Device()->CopyDescriptorsSimple(descriptorCount, baseCPUDescriptor,
                                                         mCPUViewAllocation.GetBaseDescriptor(),
                                                         D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV);

         return true;
     }

     D3D12_GPU_DESCRIPTOR_HANDLE BindGroup::GetBaseViewDescriptor() const {
         return mGPUViewAllocation.GetBaseDescriptor();
     }

     D3D12_GPU_DESCRIPTOR_HANDLE BindGroup::GetBaseSamplerDescriptor() const {
         ASSERT(mSamplerAllocationEntry.Get() != nullptr);
         return mSamplerAllocationEntry->GetBaseDescriptor();
     }

     bool BindGroup::PopulateSamplers(Device* device,
                                      ShaderVisibleDescriptorAllocator* samplerAllocator) {
         if (mSamplerAllocationEntry.Get() == nullptr) {
             return true;
         }
         return mSamplerAllocationEntry->Populate(device, samplerAllocator);
     }

     void BindGroup::SetSamplerAllocationEntry(Ref<SamplerHeapCacheEntry> entry) {
         mSamplerAllocationEntry = std::move(entry);
     }
 }}  // namespace dawn_native::d3d12
	// 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/BindGroupD3D12.h"

	#include "common/BitSetIterator.h"
	#include "dawn_native/d3d12/BindGroupLayoutD3D12.h"
	#include "dawn_native/d3d12/BufferD3D12.h"
	#include "dawn_native/d3d12/DeviceD3D12.h"
	#include "dawn_native/d3d12/SamplerHeapCacheD3D12.h"
	#include "dawn_native/d3d12/ShaderVisibleDescriptorAllocatorD3D12.h"
	#include "dawn_native/d3d12/TextureD3D12.h"

	namespace dawn_native { namespace d3d12 {

	// static
	ResultOrError<BindGroup> BindGroup::Create(Device device,
	const BindGroupDescriptor* descriptor) {
	return ToBackend(descriptor->layout)->AllocateBindGroup(device, descriptor);
	}

	BindGroup::BindGroup(Device* device,
	const BindGroupDescriptor* descriptor,
	uint32_t viewSizeIncrement,
	const CPUDescriptorHeapAllocation& viewAllocation)
	: BindGroupBase(this, device, descriptor) {
	BindGroupLayout* bgl = ToBackend(GetLayout());

	mCPUViewAllocation = viewAllocation;

	const auto& bindingOffsets = bgl->GetBindingOffsets();

	ID3D12Device* d3d12Device = device->GetD3D12Device();

	// It's not necessary to create descriptors in the descriptor heap for dynamic resources.
	// This is because they are created as root descriptors which are never heap allocated.
	// Since dynamic buffers are packed in the front, we can skip over these bindings by
	// starting from the dynamic buffer count.
	for (BindingIndex bindingIndex = bgl->GetDynamicBufferCount();
	bindingIndex < bgl->GetBindingCount(); ++bindingIndex) {
	const BindingInfo& bindingInfo = bgl->GetBindingInfo(bindingIndex);

	// Increment size does not need to be stored and is only used to get a handle
	// local to the allocation with OffsetFrom().
	switch (bindingInfo.type) {
	case wgpu::BindingType::UniformBuffer: {
	BufferBinding binding = GetBindingAsBufferBinding(bindingIndex);

	D3D12_CONSTANT_BUFFER_VIEW_DESC desc;
	// TODO(enga@google.com): investigate if this needs to be a constraint at
	// the API level
	desc.SizeInBytes = Align(binding.size, 256);
	desc.BufferLocation = ToBackend(binding.buffer)->GetVA() + binding.offset;

	d3d12Device->CreateConstantBufferView(
	&desc,
	viewAllocation.OffsetFrom(viewSizeIncrement, bindingOffsets[bindingIndex]));
	break;
	}
	case wgpu::BindingType::StorageBuffer: {
	BufferBinding binding = GetBindingAsBufferBinding(bindingIndex);

	// Since SPIRV-Cross outputs HLSL shaders with RWByteAddressBuffer,
	// we must use D3D12_BUFFER_UAV_FLAG_RAW when making the
	// UNORDERED_ACCESS_VIEW_DESC. Using D3D12_BUFFER_UAV_FLAG_RAW requires
	// that we use DXGI_FORMAT_R32_TYPELESS as the format of the view.
	// DXGI_FORMAT_R32_TYPELESS requires that the element size be 4
	// byte aligned. Since binding.size and binding.offset are in bytes,
	// we need to divide by 4 to obtain the element size.
	D3D12_UNORDERED_ACCESS_VIEW_DESC desc;
	desc.Buffer.NumElements = binding.size / 4;
	desc.Format = DXGI_FORMAT_R32_TYPELESS;
	desc.ViewDimension = D3D12_UAV_DIMENSION_BUFFER;
	desc.Buffer.FirstElement = binding.offset / 4;
	desc.Buffer.StructureByteStride = 0;
	desc.Buffer.CounterOffsetInBytes = 0;
	desc.Buffer.Flags = D3D12_BUFFER_UAV_FLAG_RAW;

	d3d12Device->CreateUnorderedAccessView(
	ToBackend(binding.buffer)->GetD3D12Resource().Get(), nullptr, &desc,
	viewAllocation.OffsetFrom(viewSizeIncrement, bindingOffsets[bindingIndex]));
	break;
	}
	case wgpu::BindingType::ReadonlyStorageBuffer: {
	BufferBinding binding = GetBindingAsBufferBinding(bindingIndex);

	// Like StorageBuffer, SPIRV-Cross outputs HLSL shaders for readonly storage
	// buffer with ByteAddressBuffer. So we must use D3D12_BUFFER_SRV_FLAG_RAW
	// when making the SRV descriptor. And it has similar requirement for
	// format, element size, etc.
	D3D12_SHADER_RESOURCE_VIEW_DESC desc;
	desc.Format = DXGI_FORMAT_R32_TYPELESS;
	desc.ViewDimension = D3D12_SRV_DIMENSION_BUFFER;
	desc.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
	desc.Buffer.FirstElement = binding.offset / 4;
	desc.Buffer.NumElements = binding.size / 4;
	desc.Buffer.StructureByteStride = 0;
	desc.Buffer.Flags = D3D12_BUFFER_SRV_FLAG_RAW;
	d3d12Device->CreateShaderResourceView(
	ToBackend(binding.buffer)->GetD3D12Resource().Get(), &desc,
	viewAllocation.OffsetFrom(viewSizeIncrement, bindingOffsets[bindingIndex]));
	break;
	}

	// Readonly storage is implemented as SRV so it can be used at the same time as a
	// sampled texture.
	case wgpu::BindingType::SampledTexture:
	case wgpu::BindingType::ReadonlyStorageTexture: {
	auto* view = ToBackend(GetBindingAsTextureView(bindingIndex));
	auto& srv = view->GetSRVDescriptor();
	d3d12Device->CreateShaderResourceView(
	ToBackend(view->GetTexture())->GetD3D12Resource(), &srv,
	viewAllocation.OffsetFrom(viewSizeIncrement, bindingOffsets[bindingIndex]));
	break;
	}
	case wgpu::BindingType::Sampler:
	case wgpu::BindingType::ComparisonSampler: {
	// No-op as samplers will be later initialized by CreateSamplers().
	break;
	}

	case wgpu::BindingType::WriteonlyStorageTexture: {
	TextureView* view = ToBackend(GetBindingAsTextureView(bindingIndex));
	D3D12_UNORDERED_ACCESS_VIEW_DESC uav = view->GetUAVDescriptor();
	d3d12Device->CreateUnorderedAccessView(
	ToBackend(view->GetTexture())->GetD3D12Resource(), nullptr, &uav,
	viewAllocation.OffsetFrom(viewSizeIncrement, bindingOffsets[bindingIndex]));
	break;
	}

	case wgpu::BindingType::StorageTexture:
	UNREACHABLE();
	break;

	// TODO(shaobo.yan@intel.com): Implement dynamic buffer offset.
	}
	}
	}

	BindGroup::~BindGroup() {
	ToBackend(GetLayout())->DeallocateBindGroup(this, &mCPUViewAllocation);
	ASSERT(!mCPUViewAllocation.IsValid());
	}

	bool BindGroup::PopulateViews(ShaderVisibleDescriptorAllocator* viewAllocator) {
	const BindGroupLayout* bgl = ToBackend(GetLayout());

	const uint32_t descriptorCount = bgl->GetCbvUavSrvDescriptorCount();
	if (descriptorCount == 0 \|\| viewAllocator->IsAllocationStillValid(mGPUViewAllocation)) {
	return true;
	}

	// Attempt to allocate descriptors for the currently bound shader-visible heaps.
	// If either failed, return early to re-allocate and switch the heaps.
	Device* device = ToBackend(GetDevice());

	D3D12_CPU_DESCRIPTOR_HANDLE baseCPUDescriptor;
	if (!viewAllocator->AllocateGPUDescriptors(descriptorCount,
	device->GetPendingCommandSerial(),
	&baseCPUDescriptor, &mGPUViewAllocation)) {
	return false;
	}

	// CPU bindgroups are sparsely allocated across CPU heaps. Instead of doing
	// simple copies per bindgroup, a single non-simple copy could be issued.
	// TODO(dawn:155): Consider doing this optimization.
	device->GetD3D12Device()->CopyDescriptorsSimple(descriptorCount, baseCPUDescriptor,
	mCPUViewAllocation.GetBaseDescriptor(),
	D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV);

	return true;
	}

	D3D12_GPU_DESCRIPTOR_HANDLE BindGroup::GetBaseViewDescriptor() const {
	return mGPUViewAllocation.GetBaseDescriptor();
	}

	D3D12_GPU_DESCRIPTOR_HANDLE BindGroup::GetBaseSamplerDescriptor() const {
	ASSERT(mSamplerAllocationEntry.Get() != nullptr);
	return mSamplerAllocationEntry->GetBaseDescriptor();
	}

	bool BindGroup::PopulateSamplers(Device* device,
	ShaderVisibleDescriptorAllocator* samplerAllocator) {
	if (mSamplerAllocationEntry.Get() == nullptr) {
	return true;
	}
	return mSamplerAllocationEntry->Populate(device, samplerAllocator);
	}

	void BindGroup::SetSamplerAllocationEntry(Ref<SamplerHeapCacheEntry> entry) {
	mSamplerAllocationEntry = std::move(entry);
	}
	}} // namespace dawn_native::d3d12