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:
- Connect to an Mac OS X with VNC
- Detach all monitors from the Mac OS X (I used a Mac mini)
- Run the code below
The animation does not work
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.
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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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