doublebuffer - sets the display mode to double buffer mode
doublebuffer sets the display mode to double buffer mode. It does not
take effect until gconfig is called. In double buffer mode, the
bitplanes are partitioned into two groups, the front bitplanes and the
back bitplanes. Double buffer mode displays only the front bitplanes.
Drawing routines normally update only the back bitplanes; frontbuffer and
backbuffer can override the default.
In double buffer mode, gconfig calls frontbuffer(OFF) and backbuffer(ON).
backbuffer, frontbuffer, gconfig, getbuffer, getdisplaymode, RGBmode,
This routine is available only in immediate mode.
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