Hi All, I'm having some problems rendering using multiple FBOs.
I have texture, to which I want to draw to using an FBO. I've verified the texture is bound to the FBO correctly by drawing basic geometry (lines/polys) before I do the QCRenderer render. 80% of the time, these geometry operations are not overwritten with the contents of the render. The other 20%, I sometimes see a first frame being rendered to the texture and then garbage afterwards. It's as if QCRenderer isn't drawing into the currently bound FBO at all, or it is, and subsequent renders are stuffing up the FBO state (I'm careful to restore previous FBO state, afaik). I've observed via OpenGL Profiler that the renderers are being called, and producing frames. The frames I really want to see painted on my textures seem to be being created as their own textures (maybe QCRenderer does this internally, I don't know), and not drawn into the FBO. Is it the case that if I setup and FBO using a shared OpenGL context, and render a QC composition via QCRenderer, that it should render-to-texture if that is how the FBO is setup? One thing to note is that the QCRenderer, view and QTMovie all share the same context. The corruption happens while the movie is playing. I wonder if it's to do with locking between these components? (since the visual context will be rendering frames at the same time). I perform a CGLContextObj cglContext = (CGLContextObj)[context CGLContextObj]; within both my view and the QCRenderer... I've put a sample movie here: http://dl.dropbox.com/u/421935/RotatingCubeExample.mov Any ideas regarding QCRenderer and FBO's, with subsequently mapping the underlying textures to a quad? Neil Clayton [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]
