src/dawn_native/PipelineLayout.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/PipelineLayout.h"

 #include "common/Assert.h"
 #include "common/BitSetIterator.h"
 #include "common/ityp_stack_vec.h"
 #include "dawn_native/BindGroupLayout.h"
 #include "dawn_native/Device.h"
 #include "dawn_native/ObjectContentHasher.h"
 #include "dawn_native/ShaderModule.h"

 namespace dawn_native {

     MaybeError ValidatePipelineLayoutDescriptor(DeviceBase* device,
                                                 const PipelineLayoutDescriptor* descriptor) {
         if (descriptor->nextInChain != nullptr) {
             return DAWN_VALIDATION_ERROR("nextInChain must be nullptr");
         }

         if (descriptor->bindGroupLayoutCount > kMaxBindGroups) {
             return DAWN_VALIDATION_ERROR("too many bind group layouts");
         }

         BindingCounts bindingCounts = {};
         for (uint32_t i = 0; i < descriptor->bindGroupLayoutCount; ++i) {
             DAWN_TRY(device->ValidateObject(descriptor->bindGroupLayouts[i]));
             AccumulateBindingCounts(&bindingCounts,
                                     descriptor->bindGroupLayouts[i]->GetBindingCountInfo());
         }

         DAWN_TRY(ValidateBindingCounts(bindingCounts));
         return {};
     }

     // PipelineLayoutBase

     PipelineLayoutBase::PipelineLayoutBase(DeviceBase* device,
                                            const PipelineLayoutDescriptor* descriptor)
         : CachedObject(device) {
         ASSERT(descriptor->bindGroupLayoutCount <= kMaxBindGroups);
         for (BindGroupIndex group(0); group < BindGroupIndex(descriptor->bindGroupLayoutCount);
              ++group) {
             mBindGroupLayouts[group] = descriptor->bindGroupLayouts[static_cast<uint32_t>(group)];
             mMask.set(group);
         }
     }

     PipelineLayoutBase::PipelineLayoutBase(DeviceBase* device, ObjectBase::ErrorTag tag)
         : CachedObject(device, tag) {
     }

     PipelineLayoutBase::~PipelineLayoutBase() {
         // Do not uncache the actual cached object if we are a blueprint
         if (IsCachedReference()) {
             GetDevice()->UncachePipelineLayout(this);
         }
     }

     // static
     PipelineLayoutBase* PipelineLayoutBase::MakeError(DeviceBase* device) {
         return new PipelineLayoutBase(device, ObjectBase::kError);
     }

     // static
     ResultOrError<Ref<PipelineLayoutBase>> PipelineLayoutBase::CreateDefault(
         DeviceBase* device,
         std::vector<StageAndDescriptor> stages) {
         using EntryMap = std::map<BindingNumber, BindGroupLayoutEntry>;

         // Merges two entries at the same location, if they are allowed to be merged.
         auto MergeEntries = [](BindGroupLayoutEntry* modifiedEntry,
                                const BindGroupLayoutEntry& mergedEntry) -> MaybeError {
             // Visibility is excluded because we take the OR across stages.
             bool compatible =
                 modifiedEntry->binding == mergedEntry.binding &&
                 modifiedEntry->buffer.type == mergedEntry.buffer.type &&
                 modifiedEntry->sampler.type == mergedEntry.sampler.type &&
                 modifiedEntry->texture.sampleType == mergedEntry.texture.sampleType &&
                 modifiedEntry->storageTexture.access == mergedEntry.storageTexture.access;

             // Minimum buffer binding size excluded because we take the maximum seen across stages.
             if (modifiedEntry->buffer.type != wgpu::BufferBindingType::Undefined) {
                 compatible = compatible && modifiedEntry->buffer.hasDynamicOffset ==
                                                mergedEntry.buffer.hasDynamicOffset;
             }

             if (modifiedEntry->texture.sampleType != wgpu::TextureSampleType::Undefined) {
                 compatible =
                     compatible &&
                     modifiedEntry->texture.viewDimension == mergedEntry.texture.viewDimension &&
                     modifiedEntry->texture.multisampled == mergedEntry.texture.multisampled;
             }

             if (modifiedEntry->storageTexture.access != wgpu::StorageTextureAccess::Undefined) {
                 compatible =
                     compatible &&
                     modifiedEntry->storageTexture.format == mergedEntry.storageTexture.format &&
                     modifiedEntry->storageTexture.viewDimension ==
                         mergedEntry.storageTexture.viewDimension;
             }

             // Check if any properties are incompatible with existing entry
             // If compatible, we will merge some properties
             if (!compatible) {
                 return DAWN_VALIDATION_ERROR(
                     "Duplicate binding in default pipeline layout initialization "
                     "not compatible with previous declaration");
             }

             // Use the max |minBufferBindingSize| we find.
             modifiedEntry->buffer.minBindingSize =
                 std::max(modifiedEntry->buffer.minBindingSize, mergedEntry.buffer.minBindingSize);

             // Use the OR of all the stages at which we find this binding.
             modifiedEntry->visibility |= mergedEntry.visibility;

             return {};
         };

         // Does the trivial conversions from a ShaderBindingInfo to a BindGroupLayoutEntry
         auto ConvertMetadataToEntry =
             [](const EntryPointMetadata::ShaderBindingInfo& shaderBinding) -> BindGroupLayoutEntry {
             BindGroupLayoutEntry entry = {};
             switch (shaderBinding.bindingType) {
                 case BindingInfoType::Buffer:
                     entry.buffer = shaderBinding.buffer;
                     break;
                 case BindingInfoType::Sampler:
                     entry.sampler = shaderBinding.sampler;
                     break;
                 case BindingInfoType::Texture:
                     entry.texture = shaderBinding.texture;
                     break;
                 case BindingInfoType::StorageTexture:
                     entry.storageTexture = shaderBinding.storageTexture;
                     break;
             }
             return entry;
         };

         // Creates the BGL from the entries for a stage, checking it is valid.
         auto CreateBGL = [](DeviceBase* device,
                             const EntryMap& entries) -> ResultOrError<Ref<BindGroupLayoutBase>> {
             std::vector<BindGroupLayoutEntry> entryVec;
             entryVec.reserve(entries.size());
             for (auto& it : entries) {
                 entryVec.push_back(it.second);
             }

             BindGroupLayoutDescriptor desc = {};
             desc.entries = entryVec.data();
             desc.entryCount = entryVec.size();

             DAWN_TRY(ValidateBindGroupLayoutDescriptor(device, &desc));
             return device->GetOrCreateBindGroupLayout(&desc);
         };

         ASSERT(!stages.empty());

         // Data which BindGroupLayoutDescriptor will point to for creation
         ityp::array<BindGroupIndex, std::map<BindingNumber, BindGroupLayoutEntry>, kMaxBindGroups>
             entryData = {};

         // Loops over all the reflected BindGroupLayoutEntries from shaders.
         for (const StageAndDescriptor& stage : stages) {
             const EntryPointMetadata::BindingInfoArray& info =
                 stage.module->GetEntryPoint(stage.entryPoint).bindings;

             for (BindGroupIndex group(0); group < info.size(); ++group) {
                 for (const auto& bindingIt : info[group]) {
                     BindingNumber bindingNumber = bindingIt.first;
                     const EntryPointMetadata::ShaderBindingInfo& shaderBinding = bindingIt.second;

                     // Create the BindGroupLayoutEntry
                     BindGroupLayoutEntry entry = ConvertMetadataToEntry(shaderBinding);
                     entry.binding = static_cast<uint32_t>(bindingNumber);
                     entry.visibility = StageBit(stage.shaderStage);

                     // Add it to our map of all entries, if there is an existing entry, then we
                     // need to merge, if we can.
                     const auto& insertion = entryData[group].insert({bindingNumber, entry});
                     if (!insertion.second) {
                         DAWN_TRY(MergeEntries(&insertion.first->second, entry));
                     }
                 }
             }
         }

         // Create the bind group layouts. We need to keep track of the last non-empty BGL because
         // Dawn doesn't yet know that an empty BGL and a null BGL are the same thing.
         // TODO(cwallez@chromium.org): remove this when Dawn knows that empty and null BGL are the
         // same.
         BindGroupIndex pipelineBGLCount = BindGroupIndex(0);
         ityp::array<BindGroupIndex, Ref<BindGroupLayoutBase>, kMaxBindGroups> bindGroupLayouts = {};
         for (BindGroupIndex group(0); group < kMaxBindGroupsTyped; ++group) {
             DAWN_TRY_ASSIGN(bindGroupLayouts[group], CreateBGL(device, entryData[group]));
             if (entryData[group].size() != 0) {
                 pipelineBGLCount = group + BindGroupIndex(1);
             }
         }

         // Create the deduced pipeline layout, validating if it is valid.
         ityp::array<BindGroupIndex, BindGroupLayoutBase*, kMaxBindGroups> bgls = {};
         for (BindGroupIndex group(0); group < pipelineBGLCount; ++group) {
             bgls[group] = bindGroupLayouts[group].Get();
         }

         PipelineLayoutDescriptor desc = {};
         desc.bindGroupLayouts = bgls.data();
         desc.bindGroupLayoutCount = static_cast<uint32_t>(pipelineBGLCount);

         DAWN_TRY(ValidatePipelineLayoutDescriptor(device, &desc));

         Ref<PipelineLayoutBase> result;
         DAWN_TRY_ASSIGN(result, device->GetOrCreatePipelineLayout(&desc));
         ASSERT(!result->IsError());

         // Sanity check in debug that the pipeline layout is compatible with the current
         // pipeline.
         for (const StageAndDescriptor& stage : stages) {
             const EntryPointMetadata& metadata = stage.module->GetEntryPoint(stage.entryPoint);
             ASSERT(ValidateCompatibilityWithPipelineLayout(device, metadata, result.Get())
                        .IsSuccess());
         }

         return std::move(result);
     }

     const BindGroupLayoutBase* PipelineLayoutBase::GetBindGroupLayout(BindGroupIndex group) const {
         ASSERT(!IsError());
         ASSERT(group < kMaxBindGroupsTyped);
         ASSERT(mMask[group]);
         const BindGroupLayoutBase* bgl = mBindGroupLayouts[group].Get();
         ASSERT(bgl != nullptr);
         return bgl;
     }

     BindGroupLayoutBase* PipelineLayoutBase::GetBindGroupLayout(BindGroupIndex group) {
         ASSERT(!IsError());
         ASSERT(group < kMaxBindGroupsTyped);
         ASSERT(mMask[group]);
         BindGroupLayoutBase* bgl = mBindGroupLayouts[group].Get();
         ASSERT(bgl != nullptr);
         return bgl;
     }

     const BindGroupLayoutMask& PipelineLayoutBase::GetBindGroupLayoutsMask() const {
         ASSERT(!IsError());
         return mMask;
     }

     BindGroupLayoutMask PipelineLayoutBase::InheritedGroupsMask(
         const PipelineLayoutBase* other) const {
         ASSERT(!IsError());
         return {(1 << static_cast<uint32_t>(GroupsInheritUpTo(other))) - 1u};
     }

     BindGroupIndex PipelineLayoutBase::GroupsInheritUpTo(const PipelineLayoutBase* other) const {
         ASSERT(!IsError());

         for (BindGroupIndex i(0); i < kMaxBindGroupsTyped; ++i) {
             if (!mMask[i] || mBindGroupLayouts[i].Get() != other->mBindGroupLayouts[i].Get()) {
                 return i;
             }
         }
         return kMaxBindGroupsTyped;
     }

     size_t PipelineLayoutBase::ComputeContentHash() {
         ObjectContentHasher recorder;
         recorder.Record(mMask);

         for (BindGroupIndex group : IterateBitSet(mMask)) {
             recorder.Record(GetBindGroupLayout(group)->GetContentHash());
         }

         return recorder.GetContentHash();
     }

     bool PipelineLayoutBase::EqualityFunc::operator()(const PipelineLayoutBase* a,
                                                       const PipelineLayoutBase* b) const {
         if (a->mMask != b->mMask) {
             return false;
         }

         for (BindGroupIndex group : IterateBitSet(a->mMask)) {
             if (a->GetBindGroupLayout(group) != b->GetBindGroupLayout(group)) {
                 return false;
             }
         }

         return true;
     }

 }  // namespace dawn_native
	// 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/PipelineLayout.h"

	#include "common/Assert.h"
	#include "common/BitSetIterator.h"
	#include "common/ityp_stack_vec.h"
	#include "dawn_native/BindGroupLayout.h"
	#include "dawn_native/Device.h"
	#include "dawn_native/ObjectContentHasher.h"
	#include "dawn_native/ShaderModule.h"

	namespace dawn_native {

	MaybeError ValidatePipelineLayoutDescriptor(DeviceBase* device,
	const PipelineLayoutDescriptor* descriptor) {
	if (descriptor->nextInChain != nullptr) {
	return DAWN_VALIDATION_ERROR("nextInChain must be nullptr");
	}

	if (descriptor->bindGroupLayoutCount > kMaxBindGroups) {
	return DAWN_VALIDATION_ERROR("too many bind group layouts");
	}

	BindingCounts bindingCounts = {};
	for (uint32_t i = 0; i < descriptor->bindGroupLayoutCount; ++i) {
	DAWN_TRY(device->ValidateObject(descriptor->bindGroupLayouts[i]));
	AccumulateBindingCounts(&bindingCounts,
	descriptor->bindGroupLayouts[i]->GetBindingCountInfo());
	}

	DAWN_TRY(ValidateBindingCounts(bindingCounts));
	return {};
	}

	// PipelineLayoutBase

	PipelineLayoutBase::PipelineLayoutBase(DeviceBase* device,
	const PipelineLayoutDescriptor* descriptor)
	: CachedObject(device) {
	ASSERT(descriptor->bindGroupLayoutCount <= kMaxBindGroups);
	for (BindGroupIndex group(0); group < BindGroupIndex(descriptor->bindGroupLayoutCount);
	++group) {
	mBindGroupLayouts[group] = descriptor->bindGroupLayouts[static_cast<uint32_t>(group)];
	mMask.set(group);
	}
	}

	PipelineLayoutBase::PipelineLayoutBase(DeviceBase* device, ObjectBase::ErrorTag tag)
	: CachedObject(device, tag) {
	}

	PipelineLayoutBase::~PipelineLayoutBase() {
	// Do not uncache the actual cached object if we are a blueprint
	if (IsCachedReference()) {
	GetDevice()->UncachePipelineLayout(this);
	}
	}

	// static
	PipelineLayoutBase* PipelineLayoutBase::MakeError(DeviceBase* device) {
	return new PipelineLayoutBase(device, ObjectBase::kError);
	}

	// static
	ResultOrError<Ref<PipelineLayoutBase>> PipelineLayoutBase::CreateDefault(
	DeviceBase* device,
	std::vector<StageAndDescriptor> stages) {
	using EntryMap = std::map<BindingNumber, BindGroupLayoutEntry>;

	// Merges two entries at the same location, if they are allowed to be merged.
	auto MergeEntries = [](BindGroupLayoutEntry* modifiedEntry,
	const BindGroupLayoutEntry& mergedEntry) -> MaybeError {
	// Visibility is excluded because we take the OR across stages.
	bool compatible =
	modifiedEntry->binding == mergedEntry.binding &&
	modifiedEntry->buffer.type == mergedEntry.buffer.type &&
	modifiedEntry->sampler.type == mergedEntry.sampler.type &&
	modifiedEntry->texture.sampleType == mergedEntry.texture.sampleType &&
	modifiedEntry->storageTexture.access == mergedEntry.storageTexture.access;

	// Minimum buffer binding size excluded because we take the maximum seen across stages.
	if (modifiedEntry->buffer.type != wgpu::BufferBindingType::Undefined) {
	compatible = compatible && modifiedEntry->buffer.hasDynamicOffset ==
	mergedEntry.buffer.hasDynamicOffset;
	}

	if (modifiedEntry->texture.sampleType != wgpu::TextureSampleType::Undefined) {
	compatible =
	compatible &&
	modifiedEntry->texture.viewDimension == mergedEntry.texture.viewDimension &&
	modifiedEntry->texture.multisampled == mergedEntry.texture.multisampled;
	}

	if (modifiedEntry->storageTexture.access != wgpu::StorageTextureAccess::Undefined) {
	compatible =
	compatible &&
	modifiedEntry->storageTexture.format == mergedEntry.storageTexture.format &&
	modifiedEntry->storageTexture.viewDimension ==
	mergedEntry.storageTexture.viewDimension;
	}

	// Check if any properties are incompatible with existing entry
	// If compatible, we will merge some properties
	if (!compatible) {
	return DAWN_VALIDATION_ERROR(
	"Duplicate binding in default pipeline layout initialization "
	"not compatible with previous declaration");
	}

	// Use the max \|minBufferBindingSize\| we find.
	modifiedEntry->buffer.minBindingSize =
	std::max(modifiedEntry->buffer.minBindingSize, mergedEntry.buffer.minBindingSize);

	// Use the OR of all the stages at which we find this binding.
	modifiedEntry->visibility \|= mergedEntry.visibility;

	return {};
	};

	// Does the trivial conversions from a ShaderBindingInfo to a BindGroupLayoutEntry
	auto ConvertMetadataToEntry =
	[](const EntryPointMetadata::ShaderBindingInfo& shaderBinding) -> BindGroupLayoutEntry {
	BindGroupLayoutEntry entry = {};
	switch (shaderBinding.bindingType) {
	case BindingInfoType::Buffer:
	entry.buffer = shaderBinding.buffer;
	break;
	case BindingInfoType::Sampler:
	entry.sampler = shaderBinding.sampler;
	break;
	case BindingInfoType::Texture:
	entry.texture = shaderBinding.texture;
	break;
	case BindingInfoType::StorageTexture:
	entry.storageTexture = shaderBinding.storageTexture;
	break;
	}
	return entry;
	};

	// Creates the BGL from the entries for a stage, checking it is valid.
	auto CreateBGL = [](DeviceBase* device,
	const EntryMap& entries) -> ResultOrError<Ref<BindGroupLayoutBase>> {
	std::vector<BindGroupLayoutEntry> entryVec;
	entryVec.reserve(entries.size());
	for (auto& it : entries) {
	entryVec.push_back(it.second);
	}

	BindGroupLayoutDescriptor desc = {};
	desc.entries = entryVec.data();
	desc.entryCount = entryVec.size();

	DAWN_TRY(ValidateBindGroupLayoutDescriptor(device, &desc));
	return device->GetOrCreateBindGroupLayout(&desc);
	};

	ASSERT(!stages.empty());

	// Data which BindGroupLayoutDescriptor will point to for creation
	ityp::array<BindGroupIndex, std::map<BindingNumber, BindGroupLayoutEntry>, kMaxBindGroups>
	entryData = {};

	// Loops over all the reflected BindGroupLayoutEntries from shaders.
	for (const StageAndDescriptor& stage : stages) {
	const EntryPointMetadata::BindingInfoArray& info =
	stage.module->GetEntryPoint(stage.entryPoint).bindings;

	for (BindGroupIndex group(0); group < info.size(); ++group) {
	for (const auto& bindingIt : info[group]) {
	BindingNumber bindingNumber = bindingIt.first;
	const EntryPointMetadata::ShaderBindingInfo& shaderBinding = bindingIt.second;

	// Create the BindGroupLayoutEntry
	BindGroupLayoutEntry entry = ConvertMetadataToEntry(shaderBinding);
	entry.binding = static_cast<uint32_t>(bindingNumber);
	entry.visibility = StageBit(stage.shaderStage);

	// Add it to our map of all entries, if there is an existing entry, then we
	// need to merge, if we can.
	const auto& insertion = entryData[group].insert({bindingNumber, entry});
	if (!insertion.second) {
	DAWN_TRY(MergeEntries(&insertion.first->second, entry));
	}
	}
	}
	}

	// Create the bind group layouts. We need to keep track of the last non-empty BGL because
	// Dawn doesn't yet know that an empty BGL and a null BGL are the same thing.
	// TODO(cwallez@chromium.org): remove this when Dawn knows that empty and null BGL are the
	// same.
	BindGroupIndex pipelineBGLCount = BindGroupIndex(0);
	ityp::array<BindGroupIndex, Ref<BindGroupLayoutBase>, kMaxBindGroups> bindGroupLayouts = {};
	for (BindGroupIndex group(0); group < kMaxBindGroupsTyped; ++group) {
	DAWN_TRY_ASSIGN(bindGroupLayouts[group], CreateBGL(device, entryData[group]));
	if (entryData[group].size() != 0) {
	pipelineBGLCount = group + BindGroupIndex(1);
	}
	}

	// Create the deduced pipeline layout, validating if it is valid.
	ityp::array<BindGroupIndex, BindGroupLayoutBase*, kMaxBindGroups> bgls = {};
	for (BindGroupIndex group(0); group < pipelineBGLCount; ++group) {
	bgls[group] = bindGroupLayouts[group].Get();
	}

	PipelineLayoutDescriptor desc = {};
	desc.bindGroupLayouts = bgls.data();
	desc.bindGroupLayoutCount = static_cast<uint32_t>(pipelineBGLCount);

	DAWN_TRY(ValidatePipelineLayoutDescriptor(device, &desc));

	Ref<PipelineLayoutBase> result;
	DAWN_TRY_ASSIGN(result, device->GetOrCreatePipelineLayout(&desc));
	ASSERT(!result->IsError());

	// Sanity check in debug that the pipeline layout is compatible with the current
	// pipeline.
	for (const StageAndDescriptor& stage : stages) {
	const EntryPointMetadata& metadata = stage.module->GetEntryPoint(stage.entryPoint);
	ASSERT(ValidateCompatibilityWithPipelineLayout(device, metadata, result.Get())
	.IsSuccess());
	}

	return std::move(result);
	}

	const BindGroupLayoutBase* PipelineLayoutBase::GetBindGroupLayout(BindGroupIndex group) const {
	ASSERT(!IsError());
	ASSERT(group < kMaxBindGroupsTyped);
	ASSERT(mMask[group]);
	const BindGroupLayoutBase* bgl = mBindGroupLayouts[group].Get();
	ASSERT(bgl != nullptr);
	return bgl;
	}

	BindGroupLayoutBase* PipelineLayoutBase::GetBindGroupLayout(BindGroupIndex group) {
	ASSERT(!IsError());
	ASSERT(group < kMaxBindGroupsTyped);
	ASSERT(mMask[group]);
	BindGroupLayoutBase* bgl = mBindGroupLayouts[group].Get();
	ASSERT(bgl != nullptr);
	return bgl;
	}

	const BindGroupLayoutMask& PipelineLayoutBase::GetBindGroupLayoutsMask() const {
	ASSERT(!IsError());
	return mMask;
	}

	BindGroupLayoutMask PipelineLayoutBase::InheritedGroupsMask(
	const PipelineLayoutBase* other) const {
	ASSERT(!IsError());
	return {(1 << static_cast<uint32_t>(GroupsInheritUpTo(other))) - 1u};
	}

	BindGroupIndex PipelineLayoutBase::GroupsInheritUpTo(const PipelineLayoutBase* other) const {
	ASSERT(!IsError());

	for (BindGroupIndex i(0); i < kMaxBindGroupsTyped; ++i) {
	if (!mMask[i] \|\| mBindGroupLayouts[i].Get() != other->mBindGroupLayouts[i].Get()) {
	return i;
	}
	}
	return kMaxBindGroupsTyped;
	}

	size_t PipelineLayoutBase::ComputeContentHash() {
	ObjectContentHasher recorder;
	recorder.Record(mMask);

	for (BindGroupIndex group : IterateBitSet(mMask)) {
	recorder.Record(GetBindGroupLayout(group)->GetContentHash());
	}

	return recorder.GetContentHash();
	}

	bool PipelineLayoutBase::EqualityFunc::operator()(const PipelineLayoutBase* a,
	const PipelineLayoutBase* b) const {
	if (a->mMask != b->mMask) {
	return false;
	}

	for (BindGroupIndex group : IterateBitSet(a->mMask)) {
	if (a->GetBindGroupLayout(group) != b->GetBindGroupLayout(group)) {
	return false;
	}
	}

	return true;
	}

	} // namespace dawn_native