DeferredRenderer: apply tonemapping and AA on 16bits floats.
DeferredRenderer: apply tonemapping and AA on 16bits floats.

Only move to 8 bits in the final display, else banding will appear.


Former-commit-id: fb9c5d6b5b8a3b33f72ed4bc53d29062954f2f96
kosua20/GL_Template,kosua20/GL_Template