Failed to Initialize GLEW. Missing GL version

问题

I've tried to set up SFML 2.0 with the latest version of the qt creator, I've set up SFML right and I imported a small game I wrote in visual studio. Upon compilation, I get this:

What I tried

Reinstalling the entire qt SDK and qt creator IDE from scratch
Reinstalling SFML
reinstalling mingw
I tried to write a simple program to make sure it's not my code, the program compiles correctly but when I close the application, I get OpenGL errors which is not normal
I tried posting a thread on the SFML forums but to no avail.
Googling the errors shows a few results, which are specific to OpenGL, and which are too localized, they don't apply to me, no answer for this happening in SFML 2.0

Additional details

I'm running windows XP SP3, latest version of mingw and qt SDK and SFML
The code I'm trying to work with works without any errors or even warnings on Visual Studio 2010 and Code::Blocks
Yes, I am sure that SFML is set up on my IDE, basic code works but shows those errors and more advanced code shows all sprites and text as boxes.
I did not compile SFML myself
My gcc version is 4.6.2
My gcc is a DW2 one

I'm getting no results, I don't even know how to remotely get close to fixing this, not even where to start.

EDIT I can't show you all of my code, it's over 20 files and I'm almost 90% sure it's not my code, I've said it above: I can run this code without any warnings or even errors on any IDE except qt creator.

回答1:

It's because you are not initializing OpenGL. Example with the lib glut.

Wrong:

 glewInit();  // ERROR MISSING GL VERSION
 glutInitDisplayMode(GLUT_RGB);

Good:

 glutInitDisplayMode(GLUT_RGB);
 glewInit();

EDIT I think for SFML:

 sf::Window   App(sf::VideoMode(400, 400, 32), "Window");
 glewInit();

EDIT 2 Test this code.

#include <SFML/Window.hpp>
#include <iostream>
#include <GL/glew.h>

int
main(int, const char**)
{
    GLenum      err;

    std::cout << "Start" << std::endl;
    std::cout << "Test 1" << std::endl;
    if ((err = glewInit()) != GLEW_OK)
        std::cout << glewGetErrorString(err) << std::endl;

    std::cout << "Init window" << std::endl;
    sf::Window  app(sf::VideoMode(400, 400, 32), "Windows");

    std::cout << "Test 2" << std::endl;
    if ((err = glewInit()) != GLEW_OK)
        std::cout << glewGetErrorString(err) << std::endl;
    std::cout << "End" << std::endl;
    return 0;
}

My output:

Start
Test 1
Missing GL version
Init window
Test 2
End

Compile with: g++ -W -Wall -Werror main.cpp -lsfml-window -lGLEW

Good Luck ;)

回答2:

At the request of user3648895, I am posting my answer outside of the comments separately.

For those using GLFW instead of SFML, you need to call glewInit() after glfwMakeContextCurrent

回答3:

If you're using glew with glfw, use glfwMakeContextCurrent (https://github.com/Cloudef/glhck/issues/15)

回答4:

For those using SDL2's Renderer functions, it needs to be right after SDL_CreateRenderer.

来源：https://stackoverflow.com/questions/14276444/failed-to-initialize-glew-missing-gl-version

标签

c++

opengl

qt-creator

sfml

glew