oc-opengl

#import <Cocoa/Cocoa.h>
#import <OpenGL/OpenGL.h>
#import <OpenGL/gl3.h>
@interface OpenGLView : NSOpenGLView

@end

@implementation OpenGLView

    -(id)initWithFrame:(NSRect)frameRect
    {
        self = [super initWithFrame:frameRect];
       
        return self;
    }
    -(void)drawRect:(NSRect)dirtyRect
    {
        glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);
        glFlush();
    }
@end

@interface MyDele : NSObject<NSApplicationDelegate>

@end

@implementation MyDele

    -(void) applicationDidFinishLaunching:(NSNotification *)notification
    {
        NSRect rect = NSMakeRect(35, 35, 1024, 800);
        NSWindowStyleMask style = NSWindowStyleMaskTitled | NSWindowStyleMaskClosable | NSWindowStyleMaskResizable;
        
        NSWindow * window = [[NSWindow alloc] initWithContentRect:rect styleMask:style backing:NSBackingStoreBuffered defer:YES];
        OpenGLView * view = [[OpenGLView alloc] initWithFrame:rect];
        [window setContentView:view];
        [NSApp beginModalSessionForWindow:window];
    }
    
    -(BOOL) applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender
    {
        return TRUE;
    }
@end

int main(int argc, const char ** argv)
{
   
    @autoreleasepool {
        MyDele * del = [[MyDele alloc] init];
        [[NSApplication sharedApplication] setDelegate: del];
        NSApplicationMain(argc, argv);
    }
    
   
}