NAME

glPassThrough - place a marker in the feedback buffer

C SPECIFICATION

void ggllPPaassssTThhrroouugghh( GLfloat _t_o_k_e_n )

        

PARAMETERS

_t_o_k_e_n
Specifies a marker value to be placed in the feedback buffer following a GGLL__PPAASSSS__TTHHRROOUUGGHH__TTOOKKEENN.

DESCRIPTION

Feedback is a GL render mode. The mode is selected by calling ggllRReennddeerrMMooddee with GGLL__FFEEEEDDBBAACCKK. 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 ggllFFeeeeddbbaacckkBBuuffffeerr reference page for a description of the feedback buffer and the values in it.

ggllPPaassssTThhrroouugghh inserts a user-defined marker in the feedback buffer when it is executed in feedback mode. _t_o_k_e_n is returned as if it were a primitive; it is indicated with its own unique identifying value: GGLL__PPAASSSS__TTHHRROOUUGGHH__TTOOKKEENN. The order of ggllPPaassssTThhrroouugghh commands with respect to the specification of graphics primitives is maintained.

NOTES

ggllPPaassssTThhrroouugghh is ignored if the GL is not in feedback mode.

ERRORS

GGLL__IINNVVAALLIIDD__OOPPEERRAATTIIOONN is generated if ggllPPaassssTThhrroouugghh is executed between the execution of ggllBBeeggiinn and the corresponding execution of ggllEEnndd.

ASSOCIATED GETS

ggllGGeett with argument GGLL__RREENNDDEERR__MMOODDEE

SEE ALSO

ggllFFeeeeddbbaacckkBBuuffffeerr((33GG)), ggllRReennddeerrMMooddee((33GG))