使用Vulkan开发时遇VK_KHR_swapchain扩展未找到问题求助

问题描述 #

笔记本仅搭载Intel(R) Iris(R) Xe集成显卡，vkcube.exe可正常运行，但自研Vulkan应用创建逻辑设备时提示VK_KHR_swapchain扩展不存在。调用vkEnumerateDeviceExtensionProperties检测到该扩展在设备支持列表中，然而vkCreateDevice返回错误码-7（扩展不存在）。

设备支持的扩展列表 #

[09:19:24:716] [TRACE]: Device Extension: VK_EXT_device_address_binding_report
[09:19:24:716] [TRACE]: Device Extension: VK_EXT_full_screen_exclusive
[09:19:24:717] [TRACE]: Device Extension: VK_KHR_swapchain

逻辑设备创建代码 #

VkDeviceCreateInfo device_create_info      = {VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO};
device_create_info.queueCreateInfoCount    = index_count;
device_create_info.pQueueCreateInfos       = queue_create_info;
device_create_info.pEnabledFeatures        = &device_features;
device_create_info.enabledExtensionCount   = 1;
const char* extension_names[1]             = {VK_KHR_SWAPCHAIN_EXTENSION_NAME};
device_create_info.ppEnabledExtensionNames = (const char* const*)&extension_names;

device_create_info.enabledLayerCount   = 0;
device_create_info.ppEnabledLayerNames = 0;

GRD_LOG_DEBUG("Creating logical device for physical device: %s", context->device.properties.deviceName);
VkResult result = vkCreateDevice(
    context->device.physical_device,
    &device_create_info,
    context->allocator,
    &context->device.logical_device);
if (result != VK_SUCCESS)
{
    GRD_LOG_FATAL("Could not create vulkan logical device. Result: %d", result);
    return FALSE;
}

运行输出 #

[08:58:45:587] [DEBUG]: Creating logical device for physical device: Intel(R) Iris(R) Xe Graphics
[08:58:45:587] [ERROR]: loader_validate_device_extensions: Device extension VK_KHR_swapchain not supported by selected physical device or enabled layers.
[08:58:45:589] [ERROR]: vkCreateDevice: Failed to validate extensions in list
[08:58:45:589] [FATAL]: Could not create vulkan logical device. Result: -7 // Result Code for Extension not present

已启用的实例扩展 #

[08:58:45:482] [DEBUG]: Vulkan Required extensions:
[08:58:45:482] [DEBUG]:     1: VK_KHR_surface
[08:58:45:483] [DEBUG]:     2: VK_KHR_get_physical_device_properties2
[08:58:45:483] [DEBUG]:     3: VK_KHR_portability_enumeration
[08:58:45:483] [DEBUG]:     4: VK_KHR_win32_surface
[08:58:45:483] [DEBUG]:     5: VK_EXT_debug_utils

问题原因及解决方法 #

问题出在逻辑设备创建时的扩展名称数组指针传递错误：
代码中device_create_info.ppEnabledExtensionNames = (const char* const*)&extension_names;的写法错误。extension_names本身是const char*[1]类型，会隐式转换为const char**，而ppEnabledExtensionNames需要的是const char* const*类型，直接赋值extension_names即可。取数组的地址&extension_names得到的是指向数组的指针（类型为const char* (*)[1]），强制转换后会导致驱动读取错误的内存地址，无法识别指定的扩展名称。

修改代码：
将

device_create_info.ppEnabledExtensionNames = (const char* const*)&extension_names;

改为

device_create_info.ppEnabledExtensionNames = extension_names;

内容的提问来源于stack exchange，提问作者Priyansh Yadav