This has been and will be a requirement. Prior to changing drawables
one should flush rendering commands. Normally if you swap than change
drawables, you will not need to flush but if you switch back and forth
you will need to flush each set of commands prior to changing
drawables.
On Nov 7, 2004, at 5:23 PM, Rob Barris wrote:
To add to what John wrote, we have found that when doing
render-to-texture operations, it may be necessary to use a glFlush or
glFinish after completing each phase of drawing and before changing
the drawable under the context. When we did not do this we sometimes
encountered rendering errors that sound like what you describe.
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