c++ - vkGetInstanceProcAddress 在调试报告扩展上失败

Question

我正在尝试启用调试报告，如下所示:https://vulkan-tutorial.com/Drawing_a_triangle/Setup/Validation_layers ,

但是下面的函数总是失败:

VkResult CreateDebugReportCallbackEXT(
    VkInstance instance, 
    const VkDebugReportCallbackCreateInfoEXT* pCreateInfo, 
    const VkAllocationCallbacks* pAllocator, 
    VkDebugReportCallbackEXT* pCallback
) 
{
    auto func = (PFN_vkCreateDebugReportCallbackEXT)vkGetInstanceProcAddr(instance, "vkCreateDebugReportCallbackEXT");
    if (func != nullptr) {
        return func(instance, pCreateInfo, pAllocator, pCallback);
    }
    else {
        return VK_ERROR_EXTENSION_NOT_PRESENT;
    }
}

func 总是以空指针结束，正如代码所说，表示扩展不存在。

调用上述函数的代码是:

void setDebugCallBack()
{
    if (!enableValidationLayers) return;
    VkDebugReportCallbackCreateInfoEXT createInfo = {};
    createInfo.sType = VK_STRUCTURE_TYPE_DEBUG_REPORT_CALLBACK_CREATE_INFO_EXT;
    createInfo.flags = VK_DEBUG_REPORT_ERROR_BIT_EXT | VK_DEBUG_REPORT_WARNING_BIT_EXT;
    createInfo.pfnCallback = debugCallback;
    VkResult result = CreateDebugReportCallbackEXT(instance, &createInfo, nullptr, &callback);
    if (result != VK_SUCCESS) 
{
        throw std::runtime_error("failed to set up debug callback!: Extension not present");
    }
}

我这样创建实例:

void createInstance()
{
    if (enableValidationLayers && !checkValidationLayerSupport()) 
    {
        throw std::runtime_error("validation layers requested, but not available!");
    }
    VkApplicationInfo appInfo = {};
    appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
    appInfo.pApplicationName = "Hello Triangle";
    appInfo.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
    appInfo.pEngineName = "No Engine";
    appInfo.engineVersion = VK_MAKE_VERSION(1, 0, 0);
    appInfo.apiVersion = VK_API_VERSION_1_0;

    VkInstanceCreateInfo createInfo = {};
    createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
    createInfo.pApplicationInfo = &appInfo;

    if (enableValidationLayers) {
        createInfo.enabledLayerCount = static_cast<uint32_t>(validationLayers.size());
        createInfo.ppEnabledLayerNames = validationLayers.data();
    }
    else {
        createInfo.enabledLayerCount = 0;
    }

    unsigned int glfwExtensionCount = 0;
    const char** glfwExtensions;

    glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);

    createInfo.enabledExtensionCount = glfwExtensionCount;
    createInfo.ppEnabledExtensionNames = glfwExtensions;

    createInfo.enabledLayerCount = 0;
    if (vkCreateInstance(&createInfo, nullptr, &instance) != VK_SUCCESS) {
        throw std::runtime_error("failed to create instance!");
    }

    uint32_t extensionCount = 0;
    vkEnumerateInstanceExtensionProperties(nullptr, &extensionCount, nullptr);

    std::vector<VkExtensionProperties> extensions(extensionCount);
    vkEnumerateInstanceExtensionProperties(nullptr, &extensionCount, extensions.data());
    std::cout << "available extensions:" << std::endl;

    for (const auto& extension : extensions)
    {
        std::cout << "\t" << extension.extensionName << std::endl;
    }

    auto ext = getRequiredExtensions();
    createInfo.enabledExtensionCount = static_cast<uint32_t>(ext.size());
    createInfo.ppEnabledExtensionNames = ext.data();
}

添加扩展名的代码如下:

std::vector<const char*> getRequiredExtensions() 
{
    std::vector<const char*> extensions;

    unsigned int glfwExtensionCount = 0;
    const char** glfwExtensions;
    glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);

    for (unsigned int i = 0; i < glfwExtensionCount; i++) 
    {
        extensions.push_back(glfwExtensions[i]);
    }

    if (enableValidationLayers) 
    {
        extensions.push_back(VK_EXT_DEBUG_REPORT_EXTENSION_NAME);
    }

    return extensions;
}

这是驱动程序/硬件问题，还是我做错了？

Answer 1

我看到了我的错误:

我必须将 createInstance 更改为:

void createInstance()
{
    if (enableValidationLayers && !checkValidationLayerSupport()) 
    {
        throw std::runtime_error("validation layers requested, but not available!");
    }
    VkApplicationInfo appInfo = {};
    appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
    appInfo.pApplicationName = "Hello Triangle";
    appInfo.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
    appInfo.pEngineName = "No Engine";
    appInfo.engineVersion = VK_MAKE_VERSION(1, 0, 0);
    appInfo.apiVersion = VK_API_VERSION_1_0;

    VkInstanceCreateInfo createInfo = {};
    createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
    createInfo.pApplicationInfo = &appInfo;

    if (enableValidationLayers) {
        createInfo.enabledLayerCount = static_cast<uint32_t>(validationLayers.size());
        createInfo.ppEnabledLayerNames = validationLayers.data();
    }
    else {
        createInfo.enabledLayerCount = 0;
    }
    //Removed glfw extension calls and data, as already requested in getRequiredExtensions()
    auto extensions = getRequiredExtensions();
    createInfo.enabledExtensionCount = static_cast<uint32_t>(extensions.size());
    createInfo.ppEnabledExtensionNames = extensions.data();

    createInfo.enabledLayerCount = 0;
    if (vkCreateInstance(&createInfo, nullptr, &instance) != VK_SUCCESS) {
        throw std::runtime_error("failed to create instance!");
    }

    uint32_t extensionCount = 0;
    vkEnumerateInstanceExtensionProperties(nullptr, &extensionCount, nullptr);

    std::vector<VkExtensionProperties> extensions(extensionCount);
    vkEnumerateInstanceExtensionProperties(nullptr, &extensionCount, extensions.data());
    std::cout << "available extensions:" << std::endl;

    for (const auto& extension : extensions)
    {
        std::cout << "\t" << extension.extensionName << std::endl;
    }
}

我不得不用新的扩展请求代码替换 glwf 扩展调用，而不是附加函数，并确保调用是在实例创建之前进行的。这确保了扩展被正确请求和启用。