I would like my sender app to cast a GLSurfaceView to the receiver app in real time. This is possible in SDK v2 using the Remote Display API. Does SDK v3 have a similar feature, or must I render the contents of the GLSurfaceView to a MediaCodec corresponding to one of the supported formats?
You can either use Cast SDK v2 (which supports the Remote Display APIs) or do something more complicated like what you suggested; Cast SDK v3 doesn't currently support the Remote Display APIs.