acsize(3G)							    acsize(3G)

NAME    [Toc]    [Back]

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

C SPECIFICATION    [Toc]    [Back]

     void acsize(planes)
     long planes;

PARAMETERS    [Toc]    [Back]

     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    [Toc]    [Back]

     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    [Toc]    [Back]

     acbuf, drawmode, gconfig

NOTES    [Toc]    [Back]

     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).


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