Disable the use of the FBO-accelerated blit() implementation when blitting from a RTT. For some reason the second blit seems to either do nothing, or access the RTT contents as at the first render somehow. The RTT is definitely updated because the other implementation of the blit() works. I can't find the cause right now, so avoid - this was stopping terrain composite map updates working on GL.
Disable the use of the FBO-accelerated blit() implementation when blitting from a RTT. For some reason the second blit seems to either do nothing, or access the RTT contents as at the first render somehow. The RTT is definitely updated because the other implementation of the blit() works. I can't find the cause right now, so avoid - this was stopping terrain composite map updates working on GL.

digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre