Prints all available OpenGL extensions

glextensions.c

// gcc -g -framework OpenGL -framework GLUT glextensions.c -o glextensions

#include <stdio.h>
#ifdef __APPLE__
#include <OpenGL/gl.h>
#include <GLUT/glut.h>
#else
#include <GL/gl.h>
#include <GL/glut.h>
#endif

int main( int argc, char** argv )
{
    glutInit(&argc, argv);
    glutInitWindowSize(1, 1);
    glutInitDisplayMode(GLUT_RGB|GLUT_SINGLE);
    glutCreateWindow("(glextensions)");
    
    glEnable(GL_NORMALIZE);
    
    char* ptr = (char*)glGetString(GL_EXTENSIONS);
    
    if( ptr == NULL )
    {
        puts("argh, no extensions..");
        return -1;
    }
    
    for( ; *(ptr); ptr++ )
        switch( *ptr )
        {
        case 0:
        case ' ':
            putchar('\n');
            break;
        default:
            putchar(*ptr);
        }
    
    return 0;
}