Check OpenGL Version

OpenGLVersionChecker.m

// Use these codes below after NSOpenGLView is prepared.

#include <OpenGL/gl.h>

- (void)doCheck
{
    NSLog(@"gl_version={%s}", glGetString(GL_VERSION));
    NSLog(@"gl_renderer={%s}", glGetString(GL_RENDERER));
    NSLog(@"gl_vendor={%s}", glGetString(GL_VENDOR));

    NSString *extensionsStr = [NSString stringWithCString:(const char *)glGetString(GL_EXTENSIONS)
                                                 encoding:NSASCIIStringEncoding];
    NSScanner *scanner = [NSScanner scannerWithString:extensionsStr];
    NSMutableArray *extensions = [NSMutableArray array];
    while (![scanner isAtEnd]) {
        NSString *anExtension;
        if ([scanner scanUpToString:@" " intoString:&anExtension]) {
            NSLog(@"gl_an_ext={%@}", anExtension);
        }
    }
}