>> in my tests, passing images between composition with
>> valueOfOutputKey:OfType
>> with QCImage is the best option, BUT if the composition have to render
>> something with a billboard for example,
>> better to render it to an OpenGL FBO and passing the texture to the next
>> composition rather then using a render in image patch in QC and use a
>> published
>> output.
>>
> Aha, this sounds like the kind of thing I need to do. To clarify - does this
> technique require a published image output? I would like to support arbitrary
> compositions.
The valueForOutpuKey technique requires a published image output, the FBO
rendering requires a rendering patch - billboard, sprite, etc. - in the qtz
compositions.
In CoGe, i detect the composition has a publised image output or not, if not,
render it to an FBO:
if ([[synthAPlayerComp outputKeys]
containsObject:@"outputImage"]) {
[mainRenderer
setValue:[synthAPlayerRenderer valueForOutputKey:@"outputImage"
ofType:@"QCImage"] forInputKey:@"imageSourceA"];
} else {
[mainRenderer
setValue:[synthAPlayerRenderer renderToFBOatTime:time withArguments:args]
forInputKey:@"imageSourceA"];
}
The renderToFBOatTime:time method renders to a CIImage
texture:http://code.google.com/p/coge/source/browse/trunk/CoGe/AppController.m#1005
>
>> I use QCRenderers with own NSOpenGLContext objects and sharing the context
>> between the QCRenderers.
> Aha! I was trying to share the openglcontext among the renderers (in the real
> app), but I was using snapshotImage..
>
>> Never figured out a faster way to do this - and thanks for Vade the
>> pointing
>> me to the right direction some years ago :)
>>> I had tried using QCRenderer createSnapshotImageOfType using QCImage in my
>> real
>>
>>> app, but this didn't solve the performance problem (and it introduced
>> rendering
>>
>>> problems!).
>> createSnapshot is really slow...
> Thanks - really useful info!
>
>
>>>> On Oct 29, 2010, at 10:10 AM, Rua Haszard Morris wrote:
>>>>
>>>>> I'm trying to use a transition patch to transition between the output
>>>>> of
>> two
>>
>>>>
>>>>> other animations. The problem I'm having is that sometimes this is not
>>>> rendering
>>>>
>>>>> fast enough to be rendered in real time. It seems that rendering a frame
>>>>>
>> of
>>
>>>> the
>>>>
>>>>> transition qtz occasionally balloons out to 1.5 s.
>>>>>
>>>>> I've written a test loop to investigate what's happening, and it seems
>> that
>>
>>>
>>>>> every 9 or so seconds, the render takes a second or more, as opposed to
>> the
>>
>>>
>>>>> usual <0.05 s.
>>>>>
>>>>> What should I do to optimise the rendering of these animations? I'd
>>>>> like
>> to
>>
>>>> be
>>>>
>>>>> able to render full screen (i.e. 1280x720+) and in real time, e.g. at
>> frame
>>
>>>
>>>>> rates of 30 (ideally 60) per second. I'm sure this must be possible with
>>>>>
>
>>>> Quartz!
>>>>>
>>>>> Here's the (quick & dirty!) test code. Tests were run on a 2.4 GHz
>> MacBook
>>
>>>> Core
>>>>
>>>>> 2 Duo with 2 GB.
>>>>>
>>>>>
>>>>> NSString* inputQtz1 = [[NSBundlemainBundle]
>>>>> pathForResource:@"InputA"ofType:@"qtz"];
>>>>> NSString* inputQtz2 = [[NSBundlemainBundle]
>>>>> pathForResource:@"InputB"ofType:@"qtz"];
>>>>> NSString* mixQtz = [[NSBundlemainBundle]
>>>>> pathForResource:@"Dissolve"ofType:@"qtz"];
>>>>>
>>>>> // open qtzs
>>>>> QCComposition* qtz1 = [QCComposition compositionWithFile:inputQtz1];
>>>>> QCComposition* qtz2 = [QCComposition compositionWithFile:inputQtz2];
>>>>> QCComposition* qtzmix = [QCCompositioncompositionWithFile:mixQtz];
>>>>>
>>>>> // args
>>>>> NSDictionary* transitiond = [NSDictionarydictionaryWithObjectsAndKeys:
>>>>> QCCompositionInputPreviewModeKey, [NSNumbernumberWithBool:YES],
>>>>> NULL
>>>>> ];
>>>>>
>>>>> // set up renderer(s)
>>>>> CGColorSpaceRefco =
> CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
>>>>> QCRenderer* renderer1 = [[QCRendereralloc]
>>>>> initOffScreenWithSize:NSMakeSize(1280, 720) colorSpace:co
>>> composition:qtz1];
>>>>> QCRenderer* renderer2 = [[QCRendereralloc]
>>>>> initOffScreenWithSize:NSMakeSize(1280, 720) colorSpace:co
>>> composition:qtz2];
>>>>> QCRenderer* renderer3 = [[QCRendereralloc]
>>>>> initOffScreenWithSize:NSMakeSize(1280, 720) colorSpace:co
>>>> composition:qtzmix];
>>>>>
>>>>> // now render a frame at a time for a while and see how long it takes
>>>>> double tmp, max=std::numeric_limits<double>::min(),
>>>>> min=std::numeric_limits<double>::max(), total;
>>>>> int count = 0;
>>>>> NSTimeIntervalelapsed = [NSDatetimeIntervalSinceReferenceDate];
>>>>> for (NSTimeInterval time=0; time<60; time+=1.0/60.0)
>>>>> {
>>>>> NSAutoreleasePool* pool2 = [NSAutoreleasePoolnew];
>>>>>
>>>>> elapsed = [NSDatetimeIntervalSinceReferenceDate];
>>>>> [renderer1 renderAtTime:time arguments:nil];
>>>>> [renderer2 renderAtTime:time arguments:nil];
>>>>> [renderer3 renderAtTime:time arguments:transitiond];
>>>>>
>>>>> tmp = ([NSDatetimeIntervalSinceReferenceDate]-elapsed);
>>>>> std::cerr << "render " << time << " took " << tmp << std::endl;
>>>>> elapsed = [NSDatetimeIntervalSinceReferenceDate];
>>>>> count++;
>>>>>
>>>>> [pool2 release];
>>>>>
>>>>> if (tmp < min)
>>>>> min = tmp;
>>>>> if (tmp > max)
>>>>> max = tmp;
>>>>> total += tmp;
>>>>> }
>>>>>
>>>>> std::cerr << "min " << min << std::endl;
>>>>> std::cerr << "max " << max << std::endl;
>>>>> std::cerr << "total " << total << std::endl;
>>>>> std::cerr << "average " << total/count << std::endl;
>>>>> Thanks in advance - I'm sure there's something obvious I'm not doing
>>>>> that
>>
>>>> would
>>>>
>>>>> speed this up..
>>>>> Rua HM.
>>>>>
>>>>> --
>>>>> http://cartoonbeats.com
>>>>> http://haszaristwocents.blogspot.com
>>>>> http://myspace.com/haszari
>>>>> http://last.fm/music/Haszari
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> 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/tamas.lov.nagy%40gmail.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]
