为什么 glGetString(GL_VERSION) 返回空/零而不是 OpenGL 版本?

2021-12-19 00:00:00 opengl c++ glut glew

我使用的是 Linux Mint 13 XFCE.我的问题是，当我在终端中运行命令时:

I'm on Linux Mint 13 XFCE. My problem is that when I run in terminal the command: 

glxinfo | grep "OpenGL version"

我得到以下输出:

OpenGL version string: 3.3.0 NVIDIA 295.40

但是当我在应用程序中运行 glGetString(GL_VERSION) 时，结果为空.为什么这段代码没有得到gl_version?

But when I run the glGetString(GL_VERSION) in my application then the result is null. Why doesn't this code get the gl_version?

#include <stdio.h>
#include <GL/glew.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <GL/glext.h>

int main(int argc, char **argv) {

    glutInit(&argc, argv);
    glewInit();

    printf("OpenGL version supported by this platform (%s): 
",
        glGetString(GL_VERSION));
}

推荐答案

glutInit() 不会创建 GL 上下文 或使一个当前.glewInit() 和 glGetString() 需要当前的 GL 上下文才能工作.

glutInit() doesn't create a GL context or make one current. You need a current GL context for glewInit() and glGetString() to work.

试试这个:

#include <GL/glew.h>
#include <GL/glut.h>
#include <cstdio>

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutCreateWindow("GLUT");

    glewInit();
    printf("OpenGL version supported by this platform (%s): 
", glGetString(GL_VERSION));
}

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