在过去的几天中一直困扰于此问题。我正在尝试使用Vulkan API的调试层，已成功获取PFN_vkCreateDebugReportCallbackEXT和PFN_vkDestroyDebugReportCallbackEXT的函数指针。
但是，当创建该结构以用作vkCreateDebugReportCallback的参数时，我在该结构的pfnCallback部分遇到了问题。
在尝试编译时，Visual Studio会给我这个错误，我尝试如下进行类型转换:
dbgReportCreateInfo.pfnCallback = (PFN_vkDebugReportCallbackEXT) debugFunction;
和
dbgReportCreateInfo.pfnCallback = reinterpret_cast<PFN_vkDebugReportCallbackEXT>(debugFunction);
当调用
vkCreateDebugReportCallback函数时，这两者都会导致内存访问冲突。什么应该工作
从教科书Learning Vulkan和提供的存储库中，结构的
PFN_vkDebugReportCallbackEXT pfn部分的正确声明应如其存储库here中所示。VKAPI_ATTR VkBool32 VKAPI_CALL debugFunction(
VkFlags msgFlags,
VkDebugReportObjectTypeEXT objType,
uint64_t srcObject,
size_t location,
uint32_t msgCode,
const char * layerPrefix,
const char * msg,
void * userData);
Vulkan header 文件
就像在Vulkan头文件vulkan.h中定义的一样
typdef uint32_t VkBool32;
typedef VkBool32 (VKAPI_PTR *PFN_vkDebugReportCallbackEXT)(
VkDebugReportFlagsEXT flags,
VkDebugReportObjectTypeEXT objectType,
uint64_t object,
size_t location,
int32_t messageCode,
const char* pLayerPrefix,
const char* pMessage,
void* pUserData);
typedef struct VkDebugReportCallbackCreateInfoEXT {
VkStructureType sType;
const void* pNext;
VkDebugReportFlagsEXT flags;
PFN_vkDebugReportCallbackEXT pfnCallback;
void* pUserData;
} VkDebugReportCallbackCreateInfoEXT;
Visual Studio错误
我的密码
我的Github repository中有完整的项目
VulkanLayerAndExtension.h
class VulkanLayerAndExtension {
// Some stuff before
VkResult createDebugReportCallback();
void destroyDebugReportCallback();
static VKAPI_ATTR VkBool32 VKAPI_CALL debugFunction(VkDebugReportFlagsEXT msgFlags,
VkDebugReportObjectTypeEXT objType,
uint64_t srcObject,
size_t location,
uint32_t msgCode,
const char * layerPrefix,
const char * msg,
void * userData);
private:
PFN_vkCreateDebugReportCallbackEXT dbgCreateDebugReportCallback;
PFN_vkDestroyDebugReportCallbackEXT dbgDestroyDebugReportCallback;
VkDebugReportCallbackEXT debugReportCallback;
public:
VkDebugReportCallbackCreateInfoEXT dbgReportCreateInfo = {};
VulkanLayerAndExtension.cpp
// stuff before
VKAPI_ATTR VkBool32 VKAPI_CALL
VulkanLayerAndExtension::debugFunction(VkDebugReportFlagsEXT msgFlags, VkDebugReportObjectTypeEXT objType, uint64_t srcObject, size_t location, uint32_t msgCode, const char * layerPrefix, const char * msg, void * userData)
{
std::cout << "[VK_DEBUG_REPORT] ";
if (msgFlags & VK_DEBUG_REPORT_ERROR_BIT_EXT) {
std::cout << "ERROR";
}
else if (msgFlags & VK_DEBUG_REPORT_WARNING_BIT_EXT) {
std::cout << "WARNING";
}
else if (msgFlags & VK_DEBUG_REPORT_INFORMATION_BIT_EXT) {
std::cout << "INFORMATION";
}
else if (msgFlags & VK_DEBUG_REPORT_PERFORMANCE_WARNING_BIT_EXT) {
std::cout << "PERFORMANCE";
}
else if (msgFlags & VK_DEBUG_REPORT_DEBUG_BIT_EXT) {
std::cout << "DEBUG";
}
else {
return VK_FALSE;
}
std::cout << ": [" << layerPrefix << "] Code" << msgCode << ":" << msg << std::endl;
return VK_TRUE;
}
VkResult VulkanLayerAndExtension::createDebugReportCallback()
{
VkResult result;
VulkanApplication * appObj = VulkanApplication::GetInstance();
VkInstance* instance = &appObj->instanceObj.instance;
// Get vkCreateDebugReportCallbackEXT API
dbgCreateDebugReportCallback = (PFN_vkCreateDebugReportCallbackEXT) vkGetInstanceProcAddr(*instance, "vkCreateDebugReportCallbackEXT");
if (!dbgCreateDebugReportCallback) {
std::cout << "Error: GetInstanceProcAddr unable to locate vkCreateDebugReportCallbackEXT function.\n";
return VK_ERROR_INITIALIZATION_FAILED;
}
std::cout << "GetInstanceProcAddr loaded dbgCreateDebugReportCallback function.\n";
// Get vkDestroyDebugReportCallbackEXT API
dbgDestroyDebugReportCallback = (PFN_vkDestroyDebugReportCallbackEXT)vkGetInstanceProcAddr(*instance, "vkDestroyDebugReportCallbackEXT");
if (!dbgDestroyDebugReportCallback) {
std::cout << "Error: GetInstanceProcAddr unable to locate vkDestroyDebugReportCallbackEXT function.\n";
return VK_ERROR_INITIALIZATION_FAILED;
}
std::cout << "GetInstanceProcAddr loaded dbgDestroyDebugReportCallback function.\n";
dbgReportCreateInfo.sType = VK_STRUCTURE_TYPE_DEBUG_REPORT_CREATE_INFO_EXT;
// Type error occurs on this line below
dbgReportCreateInfo.pfnCallback = VulkanLayerAndExtension::debugFunction;
dbgReportCreateInfo.pUserData = NULL;
dbgReportCreateInfo.pNext = NULL;
dbgReportCreateInfo.flags = VK_DEBUG_REPORT_WARNING_BIT_EXT |
VK_DEBUG_REPORT_PERFORMANCE_WARNING_BIT_EXT |
VK_DEBUG_REPORT_ERROR_BIT_EXT |
VK_DEBUG_REPORT_DEBUG_BIT_EXT;
// Create the debug report callback object
result = dbgCreateDebugReportCallback(*instance, &dbgReportCreateInfo, NULL, &debugReportCallback);
if (result == VK_SUCCESS) {
std::cout << "Debug report callback object created successfully.\n";
}
return result;
}
void VulkanLayerAndExtension::destroyDebugReportCallback()
{
VulkanApplication * appObj = VulkanApplication::GetInstance();
VkInstance & instance = appObj->instanceObj.instance;
if (debugReportCallback) {
dbgDestroyDebugReportCallback(instance, debugReportCallback, NULL);
}
}
最佳答案
为什么要强制转换功能？你不应该!该功能已经是必需的类型。
我也可以在my example project中以编程方式进行调试，并且它可以正常工作，因此请在此处进行比较:
VKAPI_ATTR VkBool32 VKAPI_CALL genericDebugCallback(
VkDebugReportFlagsEXT msgFlags,
VkDebugReportObjectTypeEXT objType,
uint64_t srcObject,
size_t /*location*/,
int32_t msgCode,
const char* pLayerPrefix,
const char* pMsg,
void* /*pUserData*/
){
// just print everything
return VK_FALSE;
}
//// elsewhere
VkDebugReportCallbackCreateInfoEXT debugCreateInfo{
VK_STRUCTURE_TYPE_DEBUG_REPORT_CREATE_INFO_EXT,
nullptr,
debugAmount,
genericDebugCallback,
nullptr
};
VkDebugReportCallbackEXT debug;
VkResult errorCode = vkCreateDebugReportCallbackEXT( instance, &debugCreateInfo, nullptr, &debug );
RESULT_HANDLER( errorCode, "vkCreateDebugReportCallbackEXT" );
因此，扫描您的代码，我会看到以下问题:
PFN_vkDebugReportCallbackEXT::msgCode是int32_t而不是uint32_t VK_TRUE。 *instance和VkInstance&？没有意义。这是一个句柄。直接使用VkInstance;没有指针，没有取消引用，也不需要引用。 dbgReportCreateInfo.flags吗？考虑到您还不接受VK_DEBUG_REPORT_DEBUG_BIT_EXT，这是一个奇怪的选择。 1和2应该可以解决您的直接问题。
关于c++ - Vulkan API调试功能指针类型转换错误，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/42919301/