fglPassThrough(3G) OpenGL Reference fglPassThrough(3G)NAME
fglPassThrough - place a marker in the feedback buffer
FORTRAN SPECIFICATION
SUBROUTINE fglPassThrough( REAL*4 token )
PARAMETERS
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
fglRenderMode 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 fglFeedbackBuffer reference page for a description
of the feedback buffer and the values in it.
fglPassThrough 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 fglPassThrough commands with respect
to the specification of graphics primitives is maintained.
NOTES
fglPassThrough is ignored if the GL is not in feedback mode.
ERRORS
GL_INVALID_OPERATION is generated if fglPassThrough is executed between
the execution of fglBegin and the corresponding execution of fglEnd.
ASSOCIATED GETS
fglGet with argument GL_RENDER_MODE
SEE ALSO
fglFeedbackBuffer, fglRenderMode
Page 1
