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Diffstat (limited to 'examples/opengl/overlay/README')
| -rw-r--r-- | examples/opengl/overlay/README | 9 |
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diff --git a/examples/opengl/overlay/README b/examples/opengl/overlay/README new file mode 100644 index 0000000..f08e539 --- /dev/null +++ b/examples/opengl/overlay/README @@ -0,0 +1,9 @@ + +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. |