出现过剩和毛刺的突然问题包括和类型说明符 [英] Sudden issues with glut and glew includes and type specifiers

问题描述

我目前正在为游戏开发课程开发一个最终的编程项目，并且选择在程序的3D渲染方面使用C ++和OpenGL(尽管我对此几乎没有经验).

I’m currently working on a final programming project for a games development course, and chose to make use of C++ and OpenGL for the 3D rendering side of the program (despite the fact I have little experience with it).

直到现在，我一直在使用它，而且还没有出现严重错误，而且还可以工作几天.但是当我返回时，由于使用了一些GLfloat变量，我开始遇到各种"C4430-缺少类型说明符"错误.

I was working with it until now absolutely fine with no serious errors, and then left it for a few days. But when I returned I started to get various "C4430 - Missing Type Specifier" errors with the few GLfloat variables I had used.

这是我以前的定义，在今天重新加载之前效果很好:

This was my previous definitions, which worked fine until I reloaded today:

    #include <gl/glew.h>
    #include <gl/glut.h>

    ... Other variable and object definitions

    const GLfloat DEFAULT_X = -5.0f;  //C4430: missing type specifyer on all 3 lines and
    const Glfloat DEFAULT_Y = -4.0f;  //C2146: syntax error : missing ';' before identifier 'DEFAULT_Y' on this line only
    const GLfloat DEFAULT_Z = -20.0f;

    GLfloat viewX = DEFAULT_X; //This line is fine
    GLfloat viewY = DEFALUT_Y; //Resulting C2065: Undeclared identifyer
    GLfloat viewZ = DEFALUT_Z; //on both these lines

为了解决此问题，我开始更改#includes(也许是一种愚蠢的方法，但此时我还是很困惑)，并发现像某些人建议的那样添加Windows.h和gl/GL.h，解决了其中一个问题.

In an attempt to fix this I began altering the #includes (perhaps, a daft approach, but I was pretty confused at this point) and found that adding Windows.h and gl/GL.h, as some have suggested, fixed all but one of the problems.

    #include <Windows.h>
    #include <gl/GL.h>
    #include <gl/glew.h>
    #include <gl/glut.h>

新问题是，在gl/glew.h之前尝试使用gl/GL.h会引发错误"C1189:在glew.h之前包含gl.h"，因为猜测是glew本身包含gl.h.但是任何更改都会带回以前的类型指定器错误.

The new problem is that attempting to use gl/GL.h before gl/glew.h throws the error "C1189: gl.h included before glew.h" because, at a guess, glew includes gl.h itself. But any alteration brings back the previous type specifyer errors.

让我感到困惑的是，如果glew包括GL.h，那么这些类型说明符也不会包括在内吗?我将继续进行方法编码，这是我暂时不需要进行的测试，但是需要能够尽快测试我正在做的事情.谁能提供帮助或建议?

What's confusing me is that if glew was including GL.h, then wouldn’t these type specifiers have also been included? I’m going to continue method coding what I can without testing for the time being, but need to be able to test what I’m doing soon. Can anyone offer help or suggestions?

推荐答案

#include <Windows.h>
#include <gl/GL.h>
#include <gl/glut.h>
#include <gl/glew.h>

这是将这些标头包含在内的错误顺序.

This is the wrong order to include these headers in.

GLEW(或您使用的任何OpenGL加载器)始终排在第一位.您绝不将gl.h包含在OpenGL加载程序标头中；您只需包括他们的名字(在这种情况下为glew.h).它位于OpenGL或OpenGL工具的所有其他标头之前.

GLEW (or whatever OpenGL loader you're using) always comes first. You never include gl.h with an OpenGL loader headers; you just include theirs (glew.h in this case). And it comes before all other headers for OpenGL or OpenGL tools.

FreeGLUT的标题紧随其后.之后，除非您正在执行某些Windows特定的代码，否则您根本不应该包含window.h.如果是这样，请将其包含在FreeGLUT的内容之后.

FreeGLUT's headers come next. After that... you shouldn't be including window.h at all, unless you're doing some Windows-specific code. If you are, you include it after FreeGLUT's stuff.

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