I don't think it has anything to do with your windowing error, but your plugins
may not be correctly installed, and it might be worth examining.
By default, "Backdrops.plugin" is a private API GFPlugin that Apple places in
System/Library/Graphics/Quartz Composer Patches, and is loaded by Photo Booth
(and maybe some other Apple apps?)
On Jan 13, 2012, at 10:11 AM, Detour wrote:
> Thoughts?? TIA.
>
> I've upgraded my machine to Lion a while ago and finally got around to
> running some of my Xcode work, and ran across this issue trying to bring a
> simple movie layer composition up full screen on a second monitor. I lock in
> the monitor to black but no video shows.
>
> In the console: 2012-01-12 21:10:49.804 My App Name[84773:407] invalid
> fullscreen drawable
>
> Plus a bunch of warning about plugins I am not using, but not important right
> away?
>
> I had a warning with the NSOpenGLContext regarding setValues using the old
> kCGLCPSwapInterval parameter, so I swappers that over to
> NSOpenGLCPSwapInterval which removed the warning, but still I get a black
> screen. The composition plays fine in QC, it is just a standard movie player
> with billboard.
>
> At the tail end of the log I see this:
>
> 2012-01-12 21:10:50.216 The Media Device[84773:407] *** QCPlugIn: Bundle at
> path "/Library/Graphics/Quartz Composer Plug-Ins/Backdrops.plugin" is not a
> valid Quartz Composer plug-in
>
> Here's the code for setting up the QCRenderer:
>
>
>
> -(void)setupRenderer:(int)screenNumber {
> CGDisplayErr err;
> CGDirectDisplayID dspys [[[NSScreen screens] count]];
> CGDisplayCount dspyCnt;
>
> //Load composition file path
> NSString *path = [[NSString alloc] initWithString:[[NSBundle
> mainBundle] pathForResource:@"Test Video Player.qtz" ofType:nil]];
> [path retain];
>
> err = CGGetOnlineDisplayList ([[NSScreen screens] count], dspys,
> &dspyCnt); if (err != CGDisplayNoErr) {
> NSLog(@"Cannot get display list");
> [NSApp terminate:nil];
> }
>
> CGDisplayCapture(dspys[screenNumber]);
> _screenSize.width = CGDisplayPixelsWide(dspys[screenNumber]);
> _screenSize.height = CGDisplayPixelsHigh(dspys[screenNumber]);
>
> GLint value = 1;
> NSOpenGLPixelFormatAttribute attributes[] = {
> NSOpenGLPFAFullScreen,
> NSOpenGLPFAScreenMask,
> CGDisplayIDToOpenGLDisplayMask(dspys[screenNumber]),
> NSOpenGLPFANoRecovery,
> NSOpenGLPFADoubleBuffer,
> NSOpenGLPFAAccelerated,
> NSOpenGLPFADepthSize, 24,
> (NSOpenGLPixelFormatAttribute) 0
> };
> NSOpenGLPixelFormat* format = [[[NSOpenGLPixelFormat alloc]
> initWithAttributes:attributes] autorelease];
>
>
> //Create the fullscreen OpenGL context on the main screen
> (double-buffered with color and depth buffers)
> _openGLContext = [[NSOpenGLContext alloc] initWithFormat:format
> shareContext:nil];
> if(_openGLContext == nil) {
> NSLog(@"Cannot create OpenGL context");
> [NSApp terminate:nil];
> }
> [_openGLContext setFullScreen];
> [_openGLContext setValues:&value forParameter:NSOpenGLCPSwapInterval];
>
> //Create the QuartzComposer Renderer with that OpenGL context and the
> specified composition file
> _renderer = [[QCRenderer alloc] initWithOpenGLContext:_openGLContext
> pixelFormat:format file:path];
> if(_renderer == nil) {
> NSLog(@"Cannot create QCRenderer");
> [NSApp terminate:nil];
> }
>
> //Create a timer which will regularly call our rendering method
> _renderTimer = [[NSTimer scheduledTimerWithTimeInterval:(1.0 /
> (NSTimeInterval)kRendererFPS) target:self selector:@selector(_render:)
> userInfo:nil repeats:YES] retain];
>
>
> }
>
> - (void) renderWithEvent:(NSEvent*)event
> {
> NSTimeInterval time = [NSDate
> timeIntervalSinceReferenceDate];
> NSPoint mouseLocation;
> NSMutableDictionary* arguments;
>
> //Let's compute our local time
> if(_startTime == 0) {
> _startTime = time;
> time = 0;
> }
> else
> time -= _startTime;
>
> //We setup the arguments to pass to the composition (normalized mouse
> coordinates and an optional event)
> mouseLocation = [NSEvent mouseLocation];
> mouseLocation.x /= _screenSize.width;
> mouseLocation.y /= _screenSize.height;
> arguments = [NSMutableDictionary dictionaryWithObject:[NSValue
> valueWithPoint:mouseLocation] forKey:QCRendererMouseLocationKey];
> if(event)
> [arguments setObject:event forKey:QCRendererEventKey];
>
> //Render a frame
> if(![_renderer renderAtTime:time arguments:arguments])
> NSLog(@"Rendering failed at time %.3fs", time);
>
> //Flush the OpenGL context to display the frame on screen
> [_openGLContext flushBuffer];
> }
>
> - (void) _render:(NSTimer*)timer
> {
> //Simply call our rendering method, passing no event to the composition
> [self renderWithEvent:nil];
> }
>
> - (void) sendEvent:(NSEvent*)event
> {
> //If the user pressed the [Esc] key, we need to exit
> if(([event type] == NSKeyDown) && ([event keyCode] == 0x35))
> [NSApp terminate:nil];
>
> //If the renderer is active and we have a meaningful event, render
> immediately passing that event to the composition
> if(_renderer && (NSEventMaskFromType([event type]) &
> kRendererEventMask))
> [self renderWithEvent:event];
> //else
> // [super sendEvent:event];
> }
>
>
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