GLPASSTHROUGH(3G) GLPASSTHROUGH(3G)

glPassThrough - place a marker in the feedback buffer

void glPassThrough( GLfloat 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 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.








glPassThrough 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 glEnd.








glGet with argument GL_RENDER_MODE








glFeedbackBuffer, glRenderMode