将 Vulkan memory 分配器与 Volk 一起使用

Question

我目前正在尝试将 Vulkan memory 分配器与元加载器 Volk 一起使用，这是两者的链接： https://github.com/zeux/volk

https://gpuopen.com/vulkan-memory-allocator/

但是我在创建 VmaAllocator 时遇到了麻烦，这是我的代码：

void VulkApp::Init(PipelineFlags t_Conf, entt::registry& t_reg)
{
    volkInitialize();
    WindowProps props = {};
    props.Height = 600;
    props.Width = 800;
    props.Title = "Engine";
    currentWindow = EngWindow::Create(props);

    //Create all physical, logical, instance for vulkan
    Prepare();
    VolkDeviceTable test;
    volkLoadDeviceTable(&test, m_LogicalDevice->GetVkDevice());
    VmaAllocatorCreateInfo allocatorCreateInfo = {};
    allocatorCreateInfo.vulkanApiVersion = VK_API_VERSION_1_2;
    allocatorCreateInfo.physicalDevice = m_PhysicalDevice->GetVkPhysicalDevice();
    allocatorCreateInfo.device = m_LogicalDevice->GetVkDevice();
    allocatorCreateInfo.instance = m_Instance->GetRawVkInstance();
    allocatorCreateInfo.pVulkanFunctions = reinterpret_cast<const VmaVulkanFunctions*> (&test);

    VmaAllocator allocator;
    vmaCreateAllocator(&allocatorCreateInfo, &allocator);
    BuildRenderPipelines(t_Conf, t_reg);
}

void VulkApp::Prepare()
{
    m_Instance = std::make_unique<VulkInst>();
    volkLoadInstance(m_Instance->GetRawVkInstance());
    currentWindow->CreateSurface(m_Instance->GetRawVkInstance(), &m_Surface);
    m_PhysicalDevice = std::make_unique<PhysicalDevice>(*m_Instance);
    m_LogicalDevice = std::make_unique<LogicalDevice>(*m_Instance, *m_PhysicalDevice, m_Surface);
    volkLoadDevice(m_LogicalDevice->GetVkDevice());
    m_SwapChain = std::make_unique<SwapChain>(ChooseSwapExtent(), *m_LogicalDevice, *m_PhysicalDevice, m_Surface);
    GraphicsHelpers::CreateCommandPool(m_CommandPool, VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT); //TODO: added Transient bit
    CreateFrameSyncResources();

    /*
    Create Camera
    */
    BuildSwapChainResources();
}

我构建时没有任何错误，但是当我执行时，VmaCreateAllocator 返回错误：

Exception raised at 0x00007FFAB0CD836B (VkLayer_khronos_validation.dll) in My_Game.exe : 0xC0000005 : access violation reading location 0x0000000000000120.

不是很有用，但它停在文件 vk_mem_alloc.h 的第 14082 行：

(*m_VulkanFunctions.vkGetPhysicalDeviceMemoryProperties)(m_PhysicalDevice, &m_MemProps);

该程序检查所有 vulkan 验证 function 所以我的 vulkan function 表必须是好的。 但仍然分配失败。 对不起，我没有放一个“最小”代码，但是对于 vulkan，即使是最小值也很长。 所以，作为第一个测试，也许你们中的一些人对错误有洞察力？

Answer 1

如果你使用像 Volk 这样的加载器，你需要自己提供 VMA 使用的所有 memory 相关的 Vulkan function 指针。

这是通过VmaAllocatorCreateInfo结构的pVulkanFunctions成员完成的。

因此，在创建VmaAllactor时，您将其中的 function 指针设置为通过 Volk 获取的指针，如下所示：

VmaVulkanFunctions vma_vulkan_func{};
vma_vulkan_func.vkAllocateMemory                    = vkAllocateMemory;
vma_vulkan_func.vkBindBufferMemory                  = vkBindBufferMemory;
vma_vulkan_func.vkBindImageMemory                   = vkBindImageMemory;
vma_vulkan_func.vkCreateBuffer                      = vkCreateBuffer;
vma_vulkan_func.vkCreateImage                       = vkCreateImage;
vma_vulkan_func.vkDestroyBuffer                     = vkDestroyBuffer;
vma_vulkan_func.vkDestroyImage                      = vkDestroyImage;
vma_vulkan_func.vkFlushMappedMemoryRanges           = vkFlushMappedMemoryRanges;
vma_vulkan_func.vkFreeMemory                        = vkFreeMemory;
vma_vulkan_func.vkGetBufferMemoryRequirements       = vkGetBufferMemoryRequirements;
vma_vulkan_func.vkGetImageMemoryRequirements        = vkGetImageMemoryRequirements;
vma_vulkan_func.vkGetPhysicalDeviceMemoryProperties = vkGetPhysicalDeviceMemoryProperties;
vma_vulkan_func.vkGetPhysicalDeviceProperties       = vkGetPhysicalDeviceProperties;
vma_vulkan_func.vkInvalidateMappedMemoryRanges      = vkInvalidateMappedMemoryRanges;
vma_vulkan_func.vkMapMemory                         = vkMapMemory;
vma_vulkan_func.vkUnmapMemory                       = vkUnmapMemory;
vma_vulkan_func.vkCmdCopyBuffer                     = vkCmdCopyBuffer;

然后将它们传递给创建信息：

VmaAllocatorCreateInfo allocator_info{};
...
allocator_info.pVulkanFunctions = &vma_vulkan_func;