Signature
Parameters
| Variables | Description |
|---|---|
| token |
Specifies a marker value to be placed in the feedback buffer
following a
GL_PASS_THROUGH_TOKEN
.
|
Description
Feedback is a GL render mode.
The mode is selected by calling
glRenderMode
with
GL_FEEDBACK
.
When the GL is in feedback mode,
no pixels are produced by rasterization.
Instead,
information about primitives that would have been rasterized
is fed back to the application using the GL.
See the
glFeedbackBuffer
reference page for a description of the
feedback buffer and the values in it.
glPassThrough
inserts a user-defined marker in the feedback buffer
when it is executed in feedback mode.
token
is returned as if it were a primitive;
it is indicated with its own unique identifying value:
GL_PASS_THROUGH_TOKEN
.
The order of
glPassThrough
commands with respect to the specification
of graphics primitives is maintained.
Notes
glPassThrough
is ignored if the GL is not in feedback mode.
Errors
GL_INVALID_OPERATION
is generated if
glPassThrough
is executed between
the execution of
glBegin
and the corresponding execution of
glEnd
.
Associated Gets
glGet
with argument
GL_RENDER_MODE
See Also
Copyright
Copyright
1991-2006
Silicon Graphics, Inc. This document is licensed under the SGI
Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/
.
Sample Code References
The following code samples have been found which appear to reference the functions described here. Take care that the code may be old, broken or not even use PyOpenGL.
glPassThrough