Allow visuals less as poor as 5/5/5 for the buffers and correctly support a variety of depths with a pixel buffer.
Allow visuals less as poor as 5/5/5 for the buffers and correctly
support a variety of depths with a pixel buffer.


git-svn-id: 4705079bc6b8aadf675e3696f5c015a6aa4916e3@718 3c1deb5b-d424-0410-962d-aba41a686d42

OpenCMISS/zinc,hsorby/zinc,OpenCMISS/zinc,OpenCMISS/zinc,OpenCMISS/zinc,hsorby/zinc,hsorby/zinc,hsorby/zinc