#import<Foundation/Foundation.h>
#import<AppKit/AppKit.h>
#include<OpenGL/gl.h>


@interface ApplicationDelegate:NSObject<NSApplicationDelegate>{
}
@end

@interface WindowDelegate:NSObject<NSWindowDelegate>{
}
@end

@interface OpenGLView:NSOpenGLView{
}
-(BOOL)acceptsFirstResponder;
-(void)keyDown:(NSEvent *)theEvent;

-(void)drawRect:(NSRect)bounds;
@end


NSWindow *window;

@implementation ApplicationDelegate{
}
-(BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication{
	return(YES);
}
-(void)applicationWillFinishLaunching:(NSNotification *)aNotification{
	NSMenu *menu=[[NSMenu alloc]init];
	[menu addItemWithTitle:@"Quit"
	      action:@selector(terminate:)
	      keyEquivalent:@"Q"];
	[NSApp setMainMenu:menu];

	NSRect mainRect=[[NSScreen mainScreen]frame];
	window=[[NSWindow alloc]initWithContentRect:[[NSScreen mainScreen]frame]
	       styleMask:NSBorderlessWindowMask
	       backing:NSBackingStoreBuffered
	       defer:YES];
	WindowDelegate *windowDelegate=[[WindowDelegate alloc]init];
	[window setDelegate:windowDelegate];
	[window setLevel:NSMainMenuWindowLevel+1];
	[window setOpaque:YES];
	[window setHidesOnDeactivate:YES];

	NSOpenGLPixelFormatAttribute attr[]={
		0,
	};
	NSOpenGLPixelFormat *openGLPixelFormat=[[NSOpenGLPixelFormat alloc]initWithAttributes:attr];
	NSRect viewRect=NSMakeRect(0.0,0.0,mainRect.size.width,mainRect.size.height);
	OpenGLView *openGLView=[[OpenGLView alloc]initWithFrame:viewRect pixelFormat:openGLPixelFormat];

	[window setContentView:openGLView];
	[window makeFirstResponder:openGLView];
}
-(void)applicationDidFinishLaunching:(NSNotification *)aNotification{
	[window makeKeyAndOrderFront:self];
}
-(void)applicationWillTerminate:(NSNotification *)aNotification{
}
@end

@implementation WindowDelegate{
}
@end

@implementation OpenGLView{
}
-(BOOL)acceptsFirstResponder{
	return(YES);
}
-(void)keyDown:(NSEvent *)theEvent{
	[NSApp terminate:self];
}

-(void)drawRect:(NSRect)bounds{
	glClearColor(1.,0.,0.,0.);
	glClear(GL_COLOR_BUFFER_BIT);
	glFlush();
}
@end


int main(void){
	[NSApplication sharedApplication];
	[NSApp setDelegate:[ApplicationDelegate new]];
	[NSApp run];
	return(0);
}