Hello,
I am fairly new to CIImage programming. So forgive me if I've missed
something obvious.
I try to feed an image port of a Quartz Composer composition with a
texture from within a FxPlug. My texture is stored as a FxTexture. I
have the sharedContext of the texture and the textureID.
As far as I have seen, I can only feed an NSImage or an CIImage to an
image port. I've managed to get it done with an NSImage, but this is
way too slow, as I have to copy the texture to a NSBitmapImageRep.
Additionally the R and B channels were switched. :-/
So I like to get it to work with an CIImage, as this claims to be
working directly with a texture that is already located in the VRAM
of the graphics card.
This is my current attempt:
CIContext *myCIContext;
NSOpenGLPixelFormatAttribute attr[] = {
NSOpenGLPFAAccelerated,
NSOpenGLPFANoRecovery,
NSOpenGLPFAColorSize, 32,
(NSOpenGLPixelFormatAttribute) 0 };
NSOpenGLPixelFormat* pixelFormat = [[[NSOpenGLPixelFormat alloc]
initWithAttributes:attr] autorelease];
myCIContext = [CIContext
contextWithCGLContext:iInfoTexture.sharedContext pixelFormat:
[pixelFormat CGLPixelFormatObj] options:nil];
[textureFX enable];
[textureFX bind];
CGSize sizeOfImage;
sizeOfImage.width = bitmapWidth;
sizeOfImage.height = bitmapHeight;
CIImage *imageBuffer = [[CIImage alloc] initWithTexture:[textureFX
textureId] size:sizeOfImage flipped:NO colorSpace:nil];
[_renderer setValue:imageBuffer forInputKey:_inputNameOfImageInput];
[_pixelBufferContext flushBuffer];
[textureFX disable];
[imageBuffer release];
Note: _renderer renders to _pixelBufferContext
Whatever I do, I always wind up with either a crash or the image
input shows up in the rendered composition a black rect.
Any ideas ?
Christoph Vonrhein
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