// Copyright 2023 The Dawn & Tint Authors
//
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#include "src/dawn/native/vulkan/external_memory/MemoryServiceImplementation.h"

#include "src/dawn/native/vulkan/DeviceVk.h"

namespace dawn::native::vulkan::external_memory {

ServiceImplementation::ServiceImplementation(Device* device) : mDevice(device) {}
ServiceImplementation::~ServiceImplementation() = default;

bool ServiceImplementation::RequiresDedicatedAllocation(const ExternalImageDescriptorVk* descriptor,
                                                        VkImage image) const {
    switch (descriptor->dedicatedAllocation) {
        case NeedsDedicatedAllocation::Yes:
            return true;

        case NeedsDedicatedAllocation::No:
            return false;

        case NeedsDedicatedAllocation::Detect:
            VkMemoryDedicatedRequirements dedicatedRequirements;
            dedicatedRequirements.sType = VK_STRUCTURE_TYPE_MEMORY_DEDICATED_REQUIREMENTS;
            dedicatedRequirements.pNext = nullptr;

            VkMemoryRequirements2 baseRequirements;
            baseRequirements.sType = VK_STRUCTURE_TYPE_MEMORY_REQUIREMENTS_2;
            baseRequirements.pNext = &dedicatedRequirements;

            VkImageMemoryRequirementsInfo2 imageInfo;
            imageInfo.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_REQUIREMENTS_INFO_2;
            imageInfo.pNext = nullptr;
            imageInfo.image = image;

            mDevice->fn.GetImageMemoryRequirements2(mDevice->GetVkDevice(), &imageInfo,
                                                    &baseRequirements);

            // The Vulkan spec requires that prefersDA is set if requiresDA is, so we can just check
            // for prefersDA.
            return dedicatedRequirements.prefersDedicatedAllocation != 0u;
    }
    DAWN_UNREACHABLE();
}

}  // namespace dawn::native::vulkan::external_memory
