There's a QCView something NSView that you can use for this purpose - just add it to your nib, and in the controller, set a QCComposition on it, keep it paused, and periodically tell it what time to render.
Sorry this email's scanty on details! ----- Original Message ---- From: Rick Mann <[email protected]> To: vade <[email protected]> Cc: quartzcomposer-dev list list <[email protected]> Sent: Sun, 30 May, 2010 7:00:47 PM Subject: Re: QCRenderer didn't It's either a sanctioned way to draw, or it's not. The fact that they even draw in a loop is more telling, because you can't do that in drawRect, either. I'm processing videos by passing a single frame "through" a composition, then taking that result and writing it to a new QTMovie. The view is just to give some feedback to the user while this is going on. (It's terribly slow, getting a single frame out of the input movie at a time, but I've gotten no response on the QT list as to why.) -- Rick On May 29, 2010, at 23:56:21, vade wrote: > Thats note is really more, bare bones, get something on the screen. Most dev > examples either subclass drawRect, or use a timer/CVdisplay link to draw > multiple frames at a video like framerate. If you only need to draw one > frame, that method could work, but re-sizing your view you require a redraw, > etc. What is your goal with this app? > > On May 30, 2010, at 2:53 AM, Rick Mann wrote: > >> Yet the docs clearly show the QCRenderer being initialized and then >> immediately drawing to the view, which you wouldn't do in a drawRect method, >> so what gives? >> >> On May 29, 2010, at 23:52:50, vade wrote: >> >>> "As with other views, you use your OpenGL view’s drawRect: method to draw >>> the content of your view. When your drawRect: method is invoked, the >>> environment is automatically configured for drawing using the OpenGL >>> graphics context associated with your view." >>> >>> "To use an OpenGL view in your program, you create a subclass of >>> NSOpenGLView and add that view to your window, either programmatically or >>> using Interface Builder." >>> >>> file:///Developer/Documentation/DocSets/com.apple.adc.documentation.AppleSnowLeopard.CoreReference.docset/Contents/Resources/Documents/documentation/Cocoa/Conceptual/CocoaDrawingGuide/QuartzOpenGL/QuartzOpenGL.html#//apple_ref/doc/uid/TP40003290-CH211-BAAECJDJ >>> >>> On May 30, 2010, at 1:46 AM, Rick Mann wrote: >>> >>>> >>>> On May 29, 2010, at 17:17:26, vade wrote: >>>> >>>>> Is that code in your NSopenGLView, and are you rendering in drawRect? >>>>> when is that actually happening? In init? In awake from nib? You probably >>>>> want to move the rendering to drawRect in your NSOpenGLView, but without >>>>> more details its hard to know. >>>> >>>> No, I do this call once, when I create the renderer (which is after the >>>> user chooses a couple of files for processing). >>>> >>>> This is straight from the QCRenderer reference doc overview. Nothing tells >>>> me I have to subclass the view and do this in the drawRect method, and I >>>> don't think that is necessarily the right way to do this (is it?). >>>> >>>>> >>>>> On May 29, 2010, at 8:07 PM, Rick Mann wrote: >>>>> >>>>>> I tried my first stab at rendering a simple composition with QCRenderer: >>>>>> >>>>>> NSOpenGLContext* glCTX = self.outputFrameView.openGLContext; >>>>>> if (mQCRenderer == nil) >>>>>> { >>>>>> NSOpenGLPixelFormat* pixelFormat = >>>>>> self.outputFrameView.pixelFormat; >>>>>> mQCRenderer = [[QCRenderer alloc] initWithOpenGLContext: glCTX >>>>>> pixelFormat: pixelFormat >>>>>> file: mCompositionPath]; >>>>>> } >>>>>> >>>>>> bool success = [mQCRenderer renderAtTime: 0.0 arguments: nil]; >>>>>> [glCTX flushBuffer]; >>>>>> >>>>>> But nothing appeared in my GL view. success was true. >>>>>> >>>>>> Any suggestions? Thanks! >>>>>> >>>>>> -- >>>>>> Rick >>>>>> >>>>>> _______________________________________________ >>>>>> Do not post admin requests to the list. They will be ignored. >>>>>> Quartzcomposer-dev mailing list ([email protected]) >>>>>> Help/Unsubscribe/Update your Subscription: >>>>>> http://lists.apple.com/mailman/options/quartzcomposer-dev/doktorp%40mac.com >>>>>> >>>>>> This email sent to [email protected] >>>>> >>>> >>> >> > _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/ruahm%40yahoo.com This email sent to [email protected] _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to [email protected]
