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feedback(3G)							  feedback(3G)

NAME    [Toc]    [Back]

     feedback, endfeedback - control feedback mode

C SPECIFICATION    [Toc]    [Back]

Personal Iris, Iris Entry, Indy, XL,
     void feedback(float buffer[], long	size)

     long endfeedback(float buffer[])

Other models:
     void feedback(short buffer[], long	size)

     long endfeedback(short buffer[])

PARAMETERS    [Toc]    [Back]

     buffer   expects a	buffer into which the system writes the	feedback
	      output from the Geometry Pipeline. On the	Personal Iris, Iris
	      Entry, Indy, XL, XS, XS24, Elan, Extreme,	and VGX, the output
	      consists of 32-bit floating point	values;	on the other IRIS-4D
	      models, the output consists of 16-bit integer values.  Be	sure
	      you declare your buffer appropriately.

     size     expects the maximum number of buffer elements into which the
	      system will write	feedback output. This must not exceed the
	      number of	elements in buffer.

     The return	value of endfeedback is	the actual number of elements of
     buffer that were written.	The system will	not write more than size
     elements, even when the amount of feedback	exceeds	it.  You should	assume
     that overflow has occurred	whenever the return value is size.

DESCRIPTION    [Toc]    [Back]

     feedback puts the system in feedback mode.	 In feedback mode, the system
     retains the output	of the Geometry	Pipeline rather	than sending it	to the
     rendering subsystem.  endfeedback turns off feedback mode and returns the
     feedback output in	buffer.	 This information is typically a description
     of	a vertex, and is machine specific.  For	information for	interpreting
     the returned buffer, see the ``Feedback'' chapter of the Graphics Library
     Programming Guide.

NOTES    [Toc]    [Back]

     These routines are	available only in immediate mode.

     On	the IRIS-4D G, GT, and GTX models the size of the buffer should	never
     exceed 0x10000 bytes.  On the IRIS-4D VGX model the size of the buffer
     should never exceed 0x80000 bytes.	 On the	IRIS-4D	RealityEngine models
     the size of the buffer is limited by the amount of	memory that can	be
     locked down by the	system.

									PPPPaaaaggggeeee 1111
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