On Mar 29, 2008, at 9:01 AM, Stefan Hafeneger wrote:
I would like to use CAOpenGLLayer instead of NSOpenGLView. I didn't
find any example source code but got it working. I implemented
…
The API documentation says that the viewport is already set to
bounds size before drawInCGLContext:... is called and that I should
disable all OpenGL settings that I enabled before. I don't
understand why.
I don't either, there's no reason for you to undo any changes to the
context you made before returning from your draw method. With the
default implementation of the -copyCGLContextForPixelFormat: method
you are guaranteed to have exclusive access to the OpenGL context
until it's destroyed.
I would like to setup my OpenGL context once (as with NSOpenGLView)
and set the perspective only if the bounds change. I tried to set
the perspective (gluPerspective) in copyCGLContextForPixelFormat:...
but this didn't work (I set the currect context to the new OpenGL
context and also locked the context).
Assuming you didn't override -copyCGLContextForPixelFormat: (e.g. to
share a single context between multiple layers) that should work, but
only until the window hosting the layer moves to a different display.
When that happens the layer's display mask may change and the layer
will release the original context and create a new one. You can detect
this by overriding either the -releaseCGLContext: or -
releaseCGLPixelFormat: method and recording that you need to reload
all your OpenGL state next time you draw.
btw, it's not necessary for you to set the current context and lock
it, CAOpenGLLayer will make sure the context passed to the draw method
is current and locked.
John
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