acsize(3G)

NAME
     acsize - specify the number of bitplanes per color component in the
     accumulation buffer

C SPECIFICATION
     void acsize(planes)
     long planes;

PARAMETERS
     planes   specifies the number of bitplanes to be reserved for each color
              component in the accumulation buffer.  Accepted values are 0
              (default) and 16.

DESCRIPTION
     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.

SEE ALSO
     acbuf, drawmode, gconfig

NOTES
     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
     (signed).