GLPASSTHROUGH() MachTen Programmer’s Manual GLPASSTHROUGH()

NAME
glPassThrough - place a marker in the feedback buffer

C SPECIFICATION
void glPassThrough( GLfloat token )

PARAMETERS
token Specifies a marker value to be placed in the feed-
back 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 feed-
back 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 com-
mands with respect to the specification of graphics primi-
tives is maintained.

NOTES
glPassThrough is ignored if the GL is not in feedback
mode.

ERRORS
GL_INVALID_OPERATION is generated if glPassThrough is exe-
cuted between the execution of glBegin and the correspond-
ing execution of glEnd.

ASSOCIATED GETS
glGet with argument GL_RENDER_MODE