glewInit（）失败，OpenGL应用程序

Question

我正在尝试用glew/glfw构建一个OpenGL应用程序。我下载了二进制文件，将它们放在文件夹的根目录中，将路径添加到include和lib目录，并告诉我的项目需要glew32。lib，GLFW。lib和opengl32。lib。

我甚至复制了glew32。因为我的项目看不到，所以将lib添加到根目录。

我必须保留项目目录中的所有依赖项，因为我将分发它。我不知所措。

现在，当我运行我的程序时，它在glewInit（）上失败了

这是我到目前为止的实现：

#include "Common.h"

GameEngine::GameEngine()
{
    InitWithSize(1024, 768);
    InitInput();
}

void GameEngine::InitWithSize(int _width, int _height)
{
    try {
        // Initialise GLFW
        if( !glfwInit() )
            throw std::exception("Failed to initialize GLFW\n");

        //glfwOpenWindowHint(GLFW_FSAA_SAMPLES, 4);
        glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3); 
        glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 3);
        glfwOpenWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

        // Open a window and create its OpenGL context
        if( !glfwOpenWindow( _width, _height, 0,0,0,0, 32,0, GLFW_WINDOW ) ) 
            throw std::exception("Failed to initialize GLFW\n");


        glfwSetWindowTitle( "Tutorial 01" );

        // Initialize GLEW
        if (glewInit() != GLEW_OK)
            throw std::exception("Failed to initialize GLEW\n");


    } catch ( std::system_error const& err) {
        fprintf(stdout, "System Error: %s", err.what());
        glfwTerminate(); // Free glfw if it has been allocated
        // Try Again
        this->InitWithSize(_width, _height);
    } catch( std::exception const& err) {
        fprintf(stdout, "Exception Found: %s", err.what());
    } catch ( ... ) {
        fprintf(stdout,"Unknown Exception Occurred\n");
    }
}

void GameEngine::InitInput()
{
        // Ensure we can capture the escape key being pressed below
        glfwEnable( GLFW_STICKY_KEYS );
}

void GameEngine::StartGameLoop()
{
    do{
            // Draw nothing, see you in tutorial 2 !

            // Swap buffers
            glfwSwapBuffers();

        } // Check if the ESC key was pressed or the window was closed
        while( glfwGetKey( GLFW_KEY_ESC ) != GLFW_PRESS &&
            glfwGetWindowParam( GLFW_OPENED ) );
}


void GameEngine::InitTestData()
{
    // An array of 3 vectors which represents 3 vertices
    static const GLfloat g_vertex_buffer_data[] = {
        -1.0f, -1.0f, 0.0f,
        1.0f, -1.0f, 0.0f,
        0.0f,  1.0f, 0.0f,
    };

}

用我的常用标题：

#ifndef _COMMON_H
#define _COMMON_H

// OpenGL Libraries
#define GLEW_STATIC
//#pragma comment(lib, "glew32.lib")
#include <GL\glew.h>
#include <GL\glfw.h>

// Core Libraries
#include <Windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <map>
#include <string>
#include <fstream>

// C++ 11 Libraries
#include <memory>
#include <exception>
#include <thread>
#include <chrono>

// Manager Classes
#include "ThreadManager.h"
#include "GameEngine.h"
#include "ShaderManager.h"

// Lesser Classes
#include "Shader.h"

#endif

Answer 1

您使用的是核心OpenGL版本3.3，因此必须指定您使用的是“新”API，以及GLEW术语中的“实验”API。在调用glewInit（）之前添加此行；

glewExperimental=GL_TRUE;

这是我引擎的完整初始化代码。它适用于4.2，但也适用于您：

 void Engine::InitWithGLFW(){
    if(!glfwInit()){
        exit(EXIT_FAILURE);
    }
    glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 4);
    glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 2);
    //glfwOpenWindowHint(GLFW_OPENGL_FORWARD_COMPAT,GL_TRUE);
    glfwOpenWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_COMPAT_PROFILE);
    glfwOpenWindowHint(GLFW_FSAA_SAMPLES,4);
    glfwDisable(GLFW_AUTO_POLL_EVENTS);

 #ifdef DEBUG
    glfwOpenWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE);
 #endif

    if(!glfwOpenWindow(_width,_height,8, 8, 8, 8, 24, 8,GLFW_WINDOW)){
        glfwTerminate();
        exit(EXIT_FAILURE);
    }

    glfwSetWindowTitle("XDEngine V-1.0");
    InitGlew();
 }

 void Engine::InitGlew(){
    glewExperimental=GL_TRUE;
    GLenum err = glewInit(); 

    if (GLEW_OK != err)
    {
        /* Problem: glewInit failed, something is seriously wrong. */
        fprintf(stderr, "Error: %s\n", glewGetErrorString(err));

    }

    fprintf(stdout, "Status: Using GLEW %s\n", glewGetString(GLEW_VERSION));
    glEnable (GL_BLEND);
    glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    glEnable(GL_MULTISAMPLE);
    glEnable(GL_DEPTH_CLAMP);
    glEnable(GL_CULL_FACE);
    glCullFace(GL_BACK);

    glfwSetWindowSizeCallback(Reshape);
 }

Answer 2

如果glewInit（）没有返回错误，则返回0。由于某种原因，返回的值与GLEW_OK比较不太好，但是如果值不是0，则存在错误。

if(glewInit()) {

  //Handle Error

}

Answer 3

我知道这个答案来得有点晚，但我看不到您通过调用glfwMakeContextCurrent（window）使OpenGL上下文成为当前上下文。在调用glewInit（）