acsize - specify the number of bitplanes per color component in the
planes specifies the number of bitplanes to be reserved for each color
component in the accumulation buffer. Accepted values are 0
(default) and 16.
Rendered images are accumulated (see acbuf) into a framebuffer with more
than 8 bits per color component. acsize specifies the size of the
accumulation buffer. You must call gconfig after acsize to activate the
new size specification.
By default the accumulation buffer size is zero, meaning that images
cannot be accumulated.
acbuf, drawmode, gconfig
This routine is available only in immediate mode.
The accumulation buffer is available only in the normal framebuffer.
acsize should be called only while draw mode is NORMALDRAW.
IRIS-4D G, GT, and GTX models, the Personal Iris, and Iris Elan do not
support the accumulation buffer. Use getgdesc to determine what support
is available for accumulation buffering.
On IRIS-4D VGX models, the 16 bits per color component accumulation
buffer is signed; it therefore supports accumulated values in the range
-32768 through 32767.
IRIS-4D RealityEngine models also support values of 12 and 24 planes
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