glPassThrough(3G)glPassThrough(3G)NAMEglPassThrough - place a marker in the feedback buffer
GLfloat token );
Specifies a marker value to be placed in the feedback buffer following
Feedback is a GL render mode. The mode is selected by calling glRender‐
Mode() 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.
NOTESglPassThrough() is ignored if the GL is not in feedback mode.
GL_INVALID_OPERATION is generated if glPassThrough() is executed
between the execution of glBegin() and the corresponding execution of
ASSOCIATED GETSglGet() with argument GL_RENDER_MODE
SEE ALSOglFeedbackBuffer(3), glRenderMode(3)glPassThrough(3G)