仅在MSVC上无法匹配GLDEBUGPROC的功能(使用相同的glew版本2.1.0，在具有gcc/clang的linux上就可以了) [英] Function unable to match GLDEBUGPROC, only on MSVC (uses same glew version 2.1.0, on linux with gcc/clang it's fine)

问题描述

我定义了以下与glDebugCallback一起使用的功能，该功能在Linux上的GCC和Clang上可以正常使用.但是，在Windows上，以下代码不想注册为OpenGL的调试回调:

I have the following function I've defined that i use with glDebugCallback, which works perfectly fine with GCC and Clang on Linux. However on Windows, the following code does not want to register as a debug callback for OpenGL:

inline void messageCallback(GLenum source, GLenum type, GLuint id, 
                            GLenum severity, GLsizei length, const GLchar* message, 
                            const void* userParam) {
    // ...
}

然后我用

glDebugMessageCallback(messageCallback, nullptr);

在查找错误标题后，它显示:

After looking up what the glew headers have, it shows:

typedef void (GLAPIENTRY *GLDEBUGPROC)(GLenum source, GLenum type, GLuint id, GLenum severity, 
                                       GLsizei length, const GLchar* message, 
                                       const void* userParam);

但是我收到一条错误消息

but I'm getting an error message that says

错误(有效)E0167类型的参数"void(*)(GLenum源，GLenum类型，GLutint id，GLenum严重性，GLsizei长度，const GLchar *消息，const void * userParam)"与类型的参数不兼容GLDEBUGPROC"

Error (active) E0167 argument of type "void (*)(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar *message, const void *userParam)" is incompatible with parameter of type "GLDEBUGPROC"

我一直试图弄清楚为什么只有MSVC才能失败...但是我很困惑，因为它看起来像逐字匹配.它在GCC/Clang上编译的事实也有点令人困惑，我不确定我缺少什么或为什么会发生这种情况.

I've been trying to figure out why it fails only with MSVC... but I'm quite stuck since it looks like it matches verbatim. The fact it compiles on GCC/Clang is also a bit confusing as well, I'm not sure what I'm missing or why this is happening.

请注意，inline关键字不会影响结果，我在没有关键字的情况下尝试了该操作，并且存在相同的问题.我只是将其保留在此处，因为我想复制并粘贴确切的内容.我还通过diff检查器对此进行了检查，以查看我是否以任何方式错误地设置了参数，但是它们是相同的.

Note that the inline keyword does not affect the result, I tried it without the keyword and the same problem is there. I just kept it there because I wanted to copy and paste the exact thing. I also put this through a diff checker to see if I did the parameters wrong in any way, but they are identical.

这是在Visual Studio 2017中，使用C ++ 17，glew 2.1.0，现代的Opengl等.我的OpenGL版本也是4.6.

This is within Visual Studio 2017, using C++17, glew 2.1.0, modern Opengl, etc. My OpenGL version is 4.6 as well.

推荐答案

您可能需要包含GLAPIENTRY限定符:

You probably need to include the GLAPIENTRY qualifier:

void GLAPIENTRY messageCallback(...)

这指定了一个调用约定，该约定告诉编译器修改传递函数参数的方式.在某些平台上，它没有什么区别，但我想它可能在Windows上也可以.

This specifies a calling convention that tells the compiler to modify the way the function's arguments are passed. On some platforms it makes no difference, but I would guess it probably does on Windows.

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