我正在尝试导出由Vulkan创建的内存分配句柄，以便将其导入OpenGL。但是，当我在 vk::ExportMemoryAllocateInfo 的 pNext 链中添加一个 OutOfDeviceMemory 时， vk::Device::allocateMemory 会抛出一个 OutOfDeviceMemory 异常。

当我不导出句柄时，分配不会失败，但返回的句柄无效。

下面是有罪代码(基于jherico的示例： vulkan-opengl-interop-示例 )：

// The physical device and the device are correct
// requirements are for a RGBA image of 1024x1024 pixels
// memory properties is just vk::MemoryPropertyFlagBits::eDeviceLocal
void IMemoryObject::Allocate(vk::PhysicalDevice physicalDevice, vk::Device device, const vk::MemoryRequirements& requirements, vk::MemoryPropertyFlags properties)
        unsigned int memoryTypeIndex = 0;
        bool memoryIndexTypeFound = false;
        vk::PhysicalDeviceMemoryProperties memoryProperties = physicalDevice.getMemoryProperties();
        for (unsigned int i = 0; i < memoryProperties.memoryTypeCount && !memoryIndexTypeFound; i++)
            vk::MemoryType memoryType = memoryProperties.memoryTypes[i];
            if (requirements.memoryTypeBits & 1 << i && (memoryType.propertyFlags & properties) == properties)
                memoryTypeIndex = i;
                memoryIndexTypeFound = true;
        if (!memoryIndexTypeFound)
            throw std::exception();
        vk::ExportMemoryAllocateInfo exportAllocInfo;
        exportAllocInfo.setHandleTypes(vk::ExternalMemoryHandleTypeFlagBits::eOpaqueWin32);
        vk::MemoryAllocateInfo allocateInfo;
        allocateInfo.setPNext(&exportAllocInfo); // Remove this line and the allocation won't fail
        allocateInfo.setAllocationSize(requirements.size);
        allocateInfo.setMemoryTypeIndex(memoryTypeIndex);
        deviceMemory_ = device.allocateMemoryUnique(allocateInfo);
        // Call VkBindBufferMemory or VkBindImageMemory, never reached anyway when allocateInfo.pNext == &exportAllocInfo;
        BindMemory(*deviceMemory_, 0);
}

我的系统是：

• Windows 7
• Nvidia Quadro RTX 4000
• 驱动程序版本431.02或431.94

验证层在我的实例中是存在的，但仍然是无用的，扩展 VK_KHR_external_memory 和 VK_KHR_external_memory_win32 在我的设备中是可用的，分配大小符合API限制，memoryIndexType是正确的。

我是不是做错了什么，还是我错过了一个限制？

谢谢！

编辑：

我试图将句柄导出为 vk::ExternalMemoryHandleTypeFlagBits::eOpaqueWin32Kmt ，并且分配工作正常。下面的代码是如何测试分配是否需要专用分配来导出句柄类型。

bool RequireDedicatedAllocation(vk::PhysicalDevice physicalDevice, const vk::ImageCreateInfo& createInfo, vk::ExternalMemoryHandleTypeFlagBits handleType)
    vk::PhysicalDeviceExternalImageFormatInfo externalImageFormatInfo;
    externalImageFormatInfo.setHandleType(handleType);
    vk::PhysicalDeviceImageFormatInfo2 imageFormatInfo;
    imageFormatInfo.setUsage(createInfo.usage)
                   .setFormat(createInfo.format)
                   .setTiling(createInfo.tiling)
                   .setType(createInfo.imageType)
                   .setPNext(&externalImageFormatInfo);