NSOpenGLLayer animation issue under VNC (original) (raw)

Alexander Scherbatiy alexandr.scherbatiy at oracle.com
Fri Feb 1 07:37:43 PST 2013

Hello Mike,

There is the issue 8005668 security control panel got greyed out when access Mac machine remotely using VNC http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8005668

After a little investigation we have found that an animation does not work for the NSOpenGLLayer if a user uses VNC connection and the MAC OS X does not have connected monitors.

 Here are steps to reproduce which use only Cocoa application:

The output shows that the drawInCGLContext method has been invoked only once or twice:

2013-02-01 19:21:27.488 OpenGLLayerSample[1731:707] invalid drawable 2013-02-01 19:21:27.489 OpenGLLayerSample[1731:707] drawInCGLContext 2013-02-01 19:21:27.513 OpenGLLayerSample[1731:707] drawInCGLContext

Connection a monitor to the Mac OS X makes the animation work.

It seems that it can have a relation to the issue 8005668 so the first time there is nothing to draw and next time nothing is drawn on a Java app. Is it a known issue and could it have a workaround?

Thanks, Alexandr.

 NSRect rect = NSMakeRect (200, 200, 300, 300);
 unsigned int styleMask = NSTitledWindowMask
 | NSMiniaturizableWindowMask;


 NSWindow *myWindow = [NSWindow alloc];
 myWindow = [myWindow initWithContentRect: rect
                                styleMask: styleMask
                                  backing: NSBackingStoreBuffered
                                    defer: NO];

 NSView *view  = [[NSView alloc] initWithFrame:rect];

 view.layer = [CALayer layer];
 view.wantsLayer = YES;
 CALayer *newLayer = [CALayer layer];
 newLayer.backgroundColor = CGColorGetConstantColor(kCGColorBlack);
 newLayer.position  = CGPointMake(150,150);
 newLayer.frame = NSMakeRect(100,100,100,100);
 [view.layer addSublayer:newLayer];

 // do some custom GL drawing
 RotatingSquareGLLayer *caGLLayer = [RotatingSquareGLLayer layer];
 caGLLayer.asynchronous = YES;
 //[caGLLayer drawsAsynchronously: YES];
 caGLLayer.position  = CGPointMake(150,150);
 caGLLayer.frame = NSMakeRect(100,100,100,100);
 caGLLayer.asynchronous = YES;
 [view.layer addSublayer:caGLLayer];

 [myWindow setContentView: view];

 [myWindow setTitle: @"Main Window"];
 [myWindow makeKeyAndOrderFront: nil];

@interface RotatingSquareGLLayer : NSOpenGLLayer { }

@end

#import <Cocoa/Cocoa.h> #import <Quartz/Quartz.h> #import <QTKit/QTKit.h>

@implementation RotatingSquareGLLayer

// override to draw custom GL content -(void)drawInCGLContext:(CGLContextObj)glContext pixelFormat:(CGLPixelFormatObj)pixelFormat forLayerTime:(CFTimeInterval)timeInterval displayTime:(const CVTimeStamp *)timeStamp {

 NSLog(@"drawInCGLContext");
 //*
 // set the current context
 CGLSetCurrentContext(glContext);

 // draw a single red quad spinning around based on the current time
 GLfloat rotate = timeInterval * 60.0; // 60 degrees per second
 glClear(GL_COLOR_BUFFER_BIT);
 glMatrixMode(GL_MODELVIEW);
 glPushMatrix();
 glRotatef(rotate, 0.0, 0.0, 1.0);
 glBegin(GL_QUADS);
 glColor3f(1.0, 0.0, 0.0);
 glVertex2f(-0.5, -0.5);
 glVertex2f(-0.5,  0.5);
 glVertex2f( 0.5,  0.5);
 glVertex2f( 0.5, -0.5);
 glEnd();
 glPopMatrix();
 //*/
 // call super to finalize the drawing - by default all it does is

call glFlush() [super drawInCGLContext:glContext pixelFormat:pixelFormat forLayerTime:timeInterval displayTime:timeStamp]; }

@end

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