GLPASSTHROUGH(3G) UNIX Programmer's Manual GLPASSTHROUGH(3G)
glPassThrough - place a marker in the feedback buffer
void glPassThrough( GLfloat token )
token Specifies a marker value to be placed in the feedback
buffer following a GL_PASS_THROUGH_TOKEN.
Feedback is a GL render mode. The mode is selected by cal-
ling glRenderMode with GL_FEEDBACK. When the GL is in feed-
back 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 specifi-
cation of graphics primitives is maintained.
glPassThrough is ignored if the GL is not in feedback mode.
GL_INVALID_OPERATION is generated if glPassThrough is exe-
cuted between the execution of glBegin and the corresponding
execution of glEnd.
glGet with argument GL_RENDER_MODE
glFeedbackBuffer(3G), glRenderMode(3G)
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