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tqt3/examples/opengl/overlay
Timothy Pearson 41bb408dde
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README

The overlay example

This example program shows how to use OpenGL overlays with the Qt OpenGL
Extension. It contains a QGLWidget with a relatively expensive
redrawing operation, and rubber-band drawing in the overlay plane.
Using the overlay has the advantage that the rubber-band may be drawn
and erased without damaging the image in the main plane, so costly
redraws are avoided.