elmindreda

// Iterate through various window hint permuations and list the results
// Copyright (c) 2010 BenXYZ
//
// Modified by Camilla Berglund <elmindreda@elmindreda.org>

#include <stdio.h>
#include <stdlib.h>

#include <GL/glfw.h>

int screenw = 800;
int screenh = 600;

#define USE_FORWARD_COMPAT(x) ((x) & 0x01)
#define USE_CORE_PROFILE(x)   ((x) & 0x02)

int main(int argc, char *argv[])
{
    if (!glfwInit())
    {
        fprintf(stderr, "Failed to initialise GLFW\n");
        exit(EXIT_FAILURE);
    }

    // Iterate though forward-compat and core profile permuations
    for (int hintswitch = 0;  hintswitch < 4;  hintswitch++)
    {
        printf("Test run with%s forward-compatibility %s with%s core profile\n",
               USE_FORWARD_COMPAT(hintswitch) ? "" : "out",
               USE_FORWARD_COMPAT(hintswitch) == USE_CORE_PROFILE(hintswitch) ? "and" : "but",
               USE_CORE_PROFILE(hintswitch) ? "" : "out");

        // Iterate through major and minor OpenGL version permuations
        for (int imaj = 1;  imaj < 5;  imaj++)
        {
            for (int imin = 0;  imin < 10;  imin++)
            {
                // Set all window hints each time, as glfwOpenWindow resets them

                glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, imaj);
                glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, imin);

                if (USE_FORWARD_COMPAT(hintswitch))
                    glfwOpenWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);

                if (USE_CORE_PROFILE(hintswitch))
                    glfwOpenWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

                printf("OpenGL version: %d.%d ", imaj, imin);

                // Try to create the desired context
                if (glfwOpenWindow(screenw, screenh, 0, 0, 0, 0, 0, 0, GLFW_WINDOW) == GL_TRUE)
                {
                    printf("works\t(reports %d.%d)\n",
                           glfwGetWindowParam(GLFW_OPENGL_VERSION_MAJOR),
                           glfwGetWindowParam(GLFW_OPENGL_VERSION_MINOR));

                    glfwCloseWindow();
                }
                else
                    printf("FAILED\n");
            }
        }

        printf("\n");
    }

    exit(EXIT_SUCCESS);
}