src/dawn/native/vulkan/DescriptorSetAllocator.h

// Copyright 2020 The Dawn & Tint Authors
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#ifndef SRC_DAWN_NATIVE_VULKAN_DESCRIPTORSETALLOCATOR_H_
#define SRC_DAWN_NATIVE_VULKAN_DESCRIPTORSETALLOCATOR_H_

#include <vector>

#include "absl/container/flat_hash_map.h"
#include "dawn/common/SerialQueue.h"
#include "dawn/common/vulkan_platform.h"
#include "dawn/native/Error.h"
#include "dawn/native/IntegerTypes.h"
#include "dawn/native/ObjectBase.h"
#include "dawn/native/vulkan/DescriptorSetAllocation.h"
#include "partition_alloc/pointers/raw_ptr.h"

namespace dawn::native::vulkan {

class BindGroupLayout;

class DescriptorSetAllocator : public ObjectBase {
    using PoolIndex = uint32_t;
    using SetIndex = uint16_t;

  public:
    static Ref<DescriptorSetAllocator> Create(
        DeviceBase* device,
        absl::flat_hash_map<VkDescriptorType, uint32_t> descriptorCountPerType);

    ResultOrError<DescriptorSetAllocation> Allocate(BindGroupLayout* layout);
    void Deallocate(DescriptorSetAllocation* allocationInfo);
    void FinishDeallocation(ExecutionSerial completedSerial);

  private:
    DescriptorSetAllocator(DeviceBase* device,
                           absl::flat_hash_map<VkDescriptorType, uint32_t> descriptorCountPerType);
    ~DescriptorSetAllocator() override;

    MaybeError AllocateDescriptorPool(BindGroupLayout* layout);

    std::vector<VkDescriptorPoolSize> mPoolSizes;
    SetIndex mMaxSets;

    struct DescriptorPool {
        VkDescriptorPool vkPool;
        std::vector<VkDescriptorSet> sets;
        std::vector<SetIndex> freeSetIndices;
    };

    std::vector<PoolIndex> mAvailableDescriptorPoolIndices;
    std::vector<DescriptorPool> mDescriptorPools;

    struct Deallocation {
        PoolIndex poolIndex;
        SetIndex setIndex;
    };
    SerialQueue<ExecutionSerial, Deallocation> mPendingDeallocations;
    ExecutionSerial mLastDeallocationSerial = ExecutionSerial(0);
};

}  // namespace dawn::native::vulkan

#endif  // SRC_DAWN_NATIVE_VULKAN_DESCRIPTORSETALLOCATOR_H_