src/dawn/native/vulkan/BindGroupLayoutVk.h

// Copyright 2018 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
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#ifndef SRC_DAWN_NATIVE_VULKAN_BINDGROUPLAYOUTVK_H_
#define SRC_DAWN_NATIVE_VULKAN_BINDGROUPLAYOUTVK_H_

#include <vector>

#include "dawn/common/MutexProtected.h"
#include "dawn/common/SlabAllocator.h"
#include "dawn/common/vulkan_platform.h"
#include "dawn/native/BindGroupLayoutInternal.h"
#include "dawn/native/vulkan/BindGroupVk.h"

namespace dawn::native {
class CacheKey;
}  // namespace dawn::native

namespace dawn::native::vulkan {

struct DescriptorSetAllocation;
class DescriptorSetAllocator;
class Device;

VkDescriptorType VulkanDescriptorType(const BindingInfo& bindingInfo);

// In Vulkan descriptor pools have to be sized to an exact number of descriptors. This means
// it's hard to have something where we can mix different types of descriptor sets because
// we don't know if their vector of number of descriptors will be similar.
//
// That's why that in addition to containing the VkDescriptorSetLayout to create
// VkDescriptorSets for its bindgroups, the layout also acts as an allocator for the descriptor
// sets.
//
// The allocations is done with one pool per descriptor set, which is inefficient, but at least
// the pools are reused when no longer used. Minimizing the number of descriptor pool allocation
// is important because creating them can incur GPU memory allocation which is usually an
// expensive syscall.
class BindGroupLayout final : public BindGroupLayoutInternalBase {
  public:
    static ResultOrError<Ref<BindGroupLayout>> Create(Device* device,
                                                      const BindGroupLayoutDescriptor* descriptor);

    BindGroupLayout(DeviceBase* device, const BindGroupLayoutDescriptor* descriptor);

    VkDescriptorSetLayout GetHandle() const;

    ResultOrError<Ref<BindGroup>> AllocateBindGroup(Device* device,
                                                    const BindGroupDescriptor* descriptor);
    void DeallocateBindGroup(BindGroup* bindGroup,
                             DescriptorSetAllocation* descriptorSetAllocation);

  private:
    ~BindGroupLayout() override;
    MaybeError Initialize();
    void DestroyImpl() override;

    // Dawn API
    void SetLabelImpl() override;

    VkDescriptorSetLayout mHandle = VK_NULL_HANDLE;

    MutexProtected<SlabAllocator<BindGroup>> mBindGroupAllocator;
    MutexProtected<Ref<DescriptorSetAllocator>> mDescriptorSetAllocator;
};

}  // namespace dawn::native::vulkan

#endif  // SRC_DAWN_NATIVE_VULKAN_BINDGROUPLAYOUTVK_H_