Having trouble calling glewInit() on a Mac? Try this...

_mac_glewinit_opengl.cpp

// Take a look at the other file below.
// Basically, since OpenGL is a core feature of OSX, you don't need to include GLEW.

/*

So, for example, you can put a conditional include like so:

#ifdef __APPLE__
    #include <OpenGL/gl3.h>         /// remove the "3" for OpenGL versions < 3
    #include <OpenGL/gl3ext.h>      /// ditto
#else 
    #include <GL/glew.h>
#endif

...

Next, instead of calling glewInit(), you can conditionally leave it out like:

#ifndef __APPLE__
    GLenum status = glewInit();

    if (status != GLEW_OK) {
        std::cerr << "GLEW failed to initialize!" << std::endl;
    }
#endif


Finally, in your g++ compiler options (or, whatever you use) put:

    -framework OpenGL
    
If you choose to use SDL2, download the runtime binaries and put them in your /Library/Frameworks folder.  Then add:

    -framework SDL2
    
to your compiler options like before.

I hope this helps someone out because it took me a while to figure out why I couldn't build a simple C++ application using
GLEW

Be sure to let me know what you think!

[email protected]

*/

display.cpp

/* 
 * File:   Display.cpp
 * Author: cbmeeks
 * 
 * Created on November 26, 2014, 8:58 PM
 */

#include "Display.h"
#include <iostream>

#ifdef __APPLE__
    #include <OpenGL/gl3.h>
    #include <OpenGL/gl3ext.h>
#else 
    #include <GL/glew.h>
#endif

Display::Display(int width, int height, const std::string& title) {

    //  Init SDL
    SDL_Init(SDL_INIT_EVERYTHING);

    //  Set color information (8 bits per color and alpha)
    SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);

    //  Set other attributes
    SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 32);
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

    m_window = SDL_CreateWindow(
            title.c_str(),
            SDL_WINDOWPOS_CENTERED,
            SDL_WINDOWPOS_CENTERED,
            width,
            height,
            SDL_WINDOW_OPENGL);

    m_glContext = SDL_GL_CreateContext(m_window);

    #ifndef __APPLE__
    //  Setup GLEW
    GLenum status = glewInit();

    if (status != GLEW_OK) {
        std::cerr << "GLEW failed to initialize!" << std::endl;
    }
    #endif

    m_isClosed = false;

}

Display::~Display() {

    SDL_GL_DeleteContext(m_glContext);
    SDL_DestroyWindow(m_window);
    SDL_Quit();
}


bool Display::IsClosed() {
    return m_isClosed;
}

void Display::Update() {

    SDL_GL_SwapWindow(m_window);

    SDL_Event e;

    while (SDL_PollEvent(&e)) {

        if (e.type == SDL_QUIT)
            m_isClosed = true;
    }

}