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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.
#ifndef DAWNNATIVE_BINDGROUPLAYOUT_H_
#define DAWNNATIVE_BINDGROUPLAYOUT_H_
#include "common/Constants.h"
#include "common/Math.h"
#include "common/SlabAllocator.h"
#include "common/ityp_span.h"
#include "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/dawn_platform.h"
#include <bitset>
#include <map>
namespace dawn_native {
MaybeError ValidateBindGroupLayoutDescriptor(DeviceBase* device,
const BindGroupLayoutDescriptor* descriptor);
// 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 CachedObject {
public:
BindGroupLayoutBase(DeviceBase* device, const BindGroupLayoutDescriptor* descriptor);
~BindGroupLayoutBase() override;
static BindGroupLayoutBase* MakeError(DeviceBase* device);
// A map from the BindingNumber to its packed BindingIndex.
using BindingMap = std::map<BindingNumber, BindingIndex>;
const BindingInfo& GetBindingInfo(BindingIndex bindingIndex) const {
ASSERT(!IsError());
ASSERT(bindingIndex < mBindingInfo.size());
return mBindingInfo[bindingIndex];
}
const BindingMap& GetBindingMap() 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;
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;
protected:
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
);
}
private:
BindGroupLayoutBase(DeviceBase* device, ObjectBase::ErrorTag tag);
BindingCounts mBindingCounts = {};
ityp::vector<BindingIndex, BindingInfo> mBindingInfo;
// Map from BindGroupLayoutEntry.binding to packed indices.
BindingMap mBindingMap;
};
} // namespace dawn_native
#endif // DAWNNATIVE_BINDGROUPLAYOUT_H_