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/SamplerD3D12.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,
                          uint32_t samplerSizeIncrement,
                          const CPUDescriptorHeapAllocation& samplerAllocation)
         : BindGroupBase(this, device, descriptor) {
         BindGroupLayout* bgl = ToBackend(GetLayout());

         mCPUViewAllocation = viewAllocation;
         mCPUSamplerAllocation = samplerAllocation;

         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;
                 }
                 case wgpu::BindingType::SampledTexture: {
                     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: {
                     auto* sampler = ToBackend(GetBindingAsSampler(bindingIndex));
                     auto& samplerDesc = sampler->GetSamplerDescriptor();
                     d3d12Device->CreateSampler(
                         &samplerDesc, samplerAllocation.OffsetFrom(samplerSizeIncrement,
                                                                    bindingOffsets[bindingIndex]));
                     break;
                 }

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

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

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

     ResultOrError<bool> BindGroup::Populate(ShaderVisibleDescriptorAllocator* allocator) {
         Device* device = ToBackend(GetDevice());

         if (allocator->IsAllocationStillValid(mLastUsageSerial, mHeapSerial)) {
             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.
         const BindGroupLayout* bgl = ToBackend(GetLayout());
         const Serial pendingSerial = device->GetPendingCommandSerial();

         ID3D12Device* d3d12Device = device->GetD3D12Device();

         // 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.
         const uint32_t viewDescriptorCount = bgl->GetCbvUavSrvDescriptorCount();
         if (viewDescriptorCount > 0) {
             DescriptorHeapAllocation viewDescriptorHeapAllocation;
             DAWN_TRY_ASSIGN(
                 viewDescriptorHeapAllocation,
                 allocator->AllocateGPUDescriptors(viewDescriptorCount, pendingSerial,
                                                   D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV));
             if (viewDescriptorHeapAllocation.IsInvalid()) {
                 return false;
             }

             d3d12Device->CopyDescriptorsSimple(
                 viewDescriptorCount, viewDescriptorHeapAllocation.GetCPUHandle(0),
                 mCPUViewAllocation.OffsetFrom(0, 0), D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV);

             mBaseViewDescriptor = viewDescriptorHeapAllocation.GetGPUHandle(0);
         }

         const uint32_t samplerDescriptorCount = bgl->GetSamplerDescriptorCount();
         if (samplerDescriptorCount > 0) {
             DescriptorHeapAllocation samplerDescriptorHeapAllocation;
             DAWN_TRY_ASSIGN(samplerDescriptorHeapAllocation,
                             allocator->AllocateGPUDescriptors(samplerDescriptorCount, pendingSerial,
                                                               D3D12_DESCRIPTOR_HEAP_TYPE_SAMPLER));
             if (samplerDescriptorHeapAllocation.IsInvalid()) {
                 return false;
             }

             d3d12Device->CopyDescriptorsSimple(
                 samplerDescriptorCount, samplerDescriptorHeapAllocation.GetCPUHandle(0),
                 mCPUSamplerAllocation.OffsetFrom(0, 0), D3D12_DESCRIPTOR_HEAP_TYPE_SAMPLER);

             mBaseSamplerDescriptor = samplerDescriptorHeapAllocation.GetGPUHandle(0);
         }

         // Record both the device and heap serials to determine later if the allocations are still
         // valid.
         mLastUsageSerial = pendingSerial;
         mHeapSerial = allocator->GetShaderVisibleHeapsSerial();

         return true;
     }

     D3D12_GPU_DESCRIPTOR_HANDLE BindGroup::GetBaseCbvUavSrvDescriptor() const {
         return mBaseViewDescriptor;
     }

     D3D12_GPU_DESCRIPTOR_HANDLE BindGroup::GetBaseSamplerDescriptor() const {
         return mBaseSamplerDescriptor;
     }
 }}  // 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/SamplerD3D12.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,
	uint32_t samplerSizeIncrement,
	const CPUDescriptorHeapAllocation& samplerAllocation)
	: BindGroupBase(this, device, descriptor) {
	BindGroupLayout* bgl = ToBackend(GetLayout());

	mCPUViewAllocation = viewAllocation;
	mCPUSamplerAllocation = samplerAllocation;

	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;
	}
	case wgpu::BindingType::SampledTexture: {
	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: {
	auto* sampler = ToBackend(GetBindingAsSampler(bindingIndex));
	auto& samplerDesc = sampler->GetSamplerDescriptor();
	d3d12Device->CreateSampler(
	&samplerDesc, samplerAllocation.OffsetFrom(samplerSizeIncrement,
	bindingOffsets[bindingIndex]));
	break;
	}

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

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

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

	ResultOrError<bool> BindGroup::Populate(ShaderVisibleDescriptorAllocator* allocator) {
	Device* device = ToBackend(GetDevice());

	if (allocator->IsAllocationStillValid(mLastUsageSerial, mHeapSerial)) {
	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.
	const BindGroupLayout* bgl = ToBackend(GetLayout());
	const Serial pendingSerial = device->GetPendingCommandSerial();

	ID3D12Device* d3d12Device = device->GetD3D12Device();

	// 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.
	const uint32_t viewDescriptorCount = bgl->GetCbvUavSrvDescriptorCount();
	if (viewDescriptorCount > 0) {
	DescriptorHeapAllocation viewDescriptorHeapAllocation;
	DAWN_TRY_ASSIGN(
	viewDescriptorHeapAllocation,
	allocator->AllocateGPUDescriptors(viewDescriptorCount, pendingSerial,
	D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV));
	if (viewDescriptorHeapAllocation.IsInvalid()) {
	return false;
	}

	d3d12Device->CopyDescriptorsSimple(
	viewDescriptorCount, viewDescriptorHeapAllocation.GetCPUHandle(0),
	mCPUViewAllocation.OffsetFrom(0, 0), D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV);

	mBaseViewDescriptor = viewDescriptorHeapAllocation.GetGPUHandle(0);
	}

	const uint32_t samplerDescriptorCount = bgl->GetSamplerDescriptorCount();
	if (samplerDescriptorCount > 0) {
	DescriptorHeapAllocation samplerDescriptorHeapAllocation;
	DAWN_TRY_ASSIGN(samplerDescriptorHeapAllocation,
	allocator->AllocateGPUDescriptors(samplerDescriptorCount, pendingSerial,
	D3D12_DESCRIPTOR_HEAP_TYPE_SAMPLER));
	if (samplerDescriptorHeapAllocation.IsInvalid()) {
	return false;
	}

	d3d12Device->CopyDescriptorsSimple(
	samplerDescriptorCount, samplerDescriptorHeapAllocation.GetCPUHandle(0),
	mCPUSamplerAllocation.OffsetFrom(0, 0), D3D12_DESCRIPTOR_HEAP_TYPE_SAMPLER);

	mBaseSamplerDescriptor = samplerDescriptorHeapAllocation.GetGPUHandle(0);
	}

	// Record both the device and heap serials to determine later if the allocations are still
	// valid.
	mLastUsageSerial = pendingSerial;
	mHeapSerial = allocator->GetShaderVisibleHeapsSerial();

	return true;
	}

	D3D12_GPU_DESCRIPTOR_HANDLE BindGroup::GetBaseCbvUavSrvDescriptor() const {
	return mBaseViewDescriptor;
	}

	D3D12_GPU_DESCRIPTOR_HANDLE BindGroup::GetBaseSamplerDescriptor() const {
	return mBaseSamplerDescriptor;
	}
	}} // namespace dawn_native::d3d12