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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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include "dawn/common/Constants.h"
#include "dawn/common/Math.h"
#include "dawn/common/SlabAllocator.h"
#include "dawn/common/ityp_span.h"
#include "dawn/common/ityp_vector.h"
#include "dawn/native/BindingInfo.h"
#include "dawn/native/CachedObject.h"
#include "dawn/native/Error.h"
#include "dawn/native/Forward.h"
#include "dawn/native/ObjectBase.h"
#include "dawn/native/dawn_platform.h"
#include <bitset>
#include <map>
namespace dawn::native {
// TODO(dawn:1082): Minor optimization to use BindingIndex instead of BindingNumber
struct ExternalTextureBindingExpansion {
BindingNumber plane0;
BindingNumber plane1;
BindingNumber params;
using ExternalTextureBindingExpansionMap =
std::map<BindingNumber, ExternalTextureBindingExpansion>;
MaybeError ValidateBindGroupLayoutDescriptor(DeviceBase* device,
const BindGroupLayoutDescriptor* descriptor,
bool allowInternalBinding = false);
// Bindings are specified as a |BindingNumber| in the BindGroupLayoutDescriptor.
// These numbers may be arbitrary and sparse. Internally, Dawn packs these numbers
// into a packed range of |BindingIndex| integers.
class BindGroupLayoutBase : public ApiObjectBase, public CachedObject {
BindGroupLayoutBase(DeviceBase* device,
const BindGroupLayoutDescriptor* descriptor,
PipelineCompatibilityToken pipelineCompatibilityToken,
ApiObjectBase::UntrackedByDeviceTag tag);
BindGroupLayoutBase(DeviceBase* device,
const BindGroupLayoutDescriptor* descriptor,
PipelineCompatibilityToken pipelineCompatibilityToken);
~BindGroupLayoutBase() override;
static BindGroupLayoutBase* MakeError(DeviceBase* device);
ObjectType GetType() const override;
// A map from the BindingNumber to its packed BindingIndex.
using BindingMap = std::map<BindingNumber, BindingIndex>;
const BindingInfo& GetBindingInfo(BindingIndex bindingIndex) const {
ASSERT(bindingIndex < mBindingInfo.size());
return mBindingInfo[bindingIndex];
const BindingMap& GetBindingMap() const;
bool HasBinding(BindingNumber bindingNumber) const;
BindingIndex GetBindingIndex(BindingNumber bindingNumber) const;
// Functions necessary for the unordered_set<BGLBase*>-based cache.
size_t ComputeContentHash() override;
struct EqualityFunc {
bool operator()(const BindGroupLayoutBase* a, const BindGroupLayoutBase* b) const;
BindingIndex GetBindingCount() const;
// Returns |BindingIndex| because buffers are packed at the front.
BindingIndex GetBufferCount() const;
// Returns |BindingIndex| because dynamic buffers are packed at the front.
BindingIndex GetDynamicBufferCount() const;
uint32_t GetUnverifiedBufferCount() const;
// Used to get counts and validate them in pipeline layout creation. Other getters
// should be used to get typed integer counts.
const BindingCounts& GetBindingCountInfo() const;
uint32_t GetExternalTextureBindingCount() const;
// Used to specify unpacked external texture binding slots when transforming shader modules.
const ExternalTextureBindingExpansionMap& GetExternalTextureBindingExpansionMap() const;
uint32_t GetUnexpandedBindingCount() const;
// Tests that the BindingInfo of two bind groups are equal,
// ignoring their compatibility groups.
bool IsLayoutEqual(const BindGroupLayoutBase* other,
bool excludePipelineCompatibiltyToken = false) const;
PipelineCompatibilityToken GetPipelineCompatibilityToken() const;
struct BufferBindingData {
uint64_t offset;
uint64_t size;
struct BindingDataPointers {
ityp::span<BindingIndex, BufferBindingData> const bufferData = {};
ityp::span<BindingIndex, Ref<ObjectBase>> const bindings = {};
ityp::span<uint32_t, uint64_t> const unverifiedBufferSizes = {};
// Compute the amount of space / alignment required to store bindings for a bind group of
// this layout.
size_t GetBindingDataSize() const;
static constexpr size_t GetBindingDataAlignment() {
static_assert(alignof(Ref<ObjectBase>) <= alignof(BufferBindingData));
return alignof(BufferBindingData);
BindingDataPointers ComputeBindingDataPointers(void* dataStart) const;
bool IsStorageBufferBinding(BindingIndex bindingIndex) const;
// Returns a detailed string representation of the layout entries for use in error messages.
std::string EntriesToString() const;
// Constructor used only for mocking and testing.
BindGroupLayoutBase(DeviceBase* device);
void DestroyImpl() override;
template <typename BindGroup>
SlabAllocator<BindGroup> MakeFrontendBindGroupAllocator(size_t size) {
return SlabAllocator<BindGroup>(
size, // bytes
Align(sizeof(BindGroup), GetBindingDataAlignment()) + GetBindingDataSize(), // size
std::max(alignof(BindGroup), GetBindingDataAlignment()) // alignment
BindGroupLayoutBase(DeviceBase* device, ObjectBase::ErrorTag tag);
BindingCounts mBindingCounts = {};
ityp::vector<BindingIndex, BindingInfo> mBindingInfo;
// Map from BindGroupLayoutEntry.binding to packed indices.
BindingMap mBindingMap;
ExternalTextureBindingExpansionMap mExternalTextureBindingExpansionMap;
// Non-0 if this BindGroupLayout was created as part of a default PipelineLayout.
const PipelineCompatibilityToken mPipelineCompatibilityToken =
uint32_t mUnexpandedBindingCount;
} // namespace dawn::native