feedback(3G) feedback(3G)
feedback, endfeedback - control feedback mode
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[])
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.
FUNCTION RETURN VALUE
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.
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.
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.
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