56 lines
1.7 KiB
Plaintext
56 lines
1.7 KiB
Plaintext
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'\" e
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'\"! eqn | mmdoc
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'\"macro stdmacro
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.ds Vn Version 1.2
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.ds Dt 24 September 1999
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.ds Re Release 1.2.1
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.ds Dp Jan 14 18:30
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.ds Dm 01 passthrou
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.ds Xs 49492 4 passthrough.gl
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.TH GLPASSTHROUGH 3G
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.SH NAME
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.B "glPassThrough
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\- place a marker in the feedback buffer
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.SH C SPECIFICATION
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void \f3glPassThrough\fP(
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GLfloat \fItoken\fP )
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.nf
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.fi
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.SH PARAMETERS
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.TP \w'\f2token\fP\ \ 'u
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\f2token\fP
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Specifies a marker value to be placed in the feedback buffer
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following a \%\f3GL_PASS_THROUGH_TOKEN\fP.
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.SH DESCRIPTION
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.P
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Feedback is a GL render mode.
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The mode is selected by calling
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\%\f3glRenderMode\fP with \%\f3GL_FEEDBACK\fP.
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When the GL is in feedback mode,
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no pixels are produced by rasterization.
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Instead,
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information about primitives that would have been rasterized
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is fed back to the application using the GL.
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See the \%\f3glFeedbackBuffer\fP reference page for a description of the
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feedback buffer and the values in it.
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.P
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\%\f3glPassThrough\fP inserts a user-defined marker in the feedback buffer
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when it is executed in feedback mode.
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\f2token\fP is returned as if it were a primitive;
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it is indicated with its own unique identifying value:
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\%\f3GL_PASS_THROUGH_TOKEN\fP.
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The order of \%\f3glPassThrough\fP commands with respect to the specification
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of graphics primitives is maintained.
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.SH NOTES
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\%\f3glPassThrough\fP is ignored if the GL is not in feedback mode.
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.SH ERRORS
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\%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glPassThrough\fP is executed between
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the execution of \%\f3glBegin\fP and the corresponding execution of \%\f3glEnd\fP.
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.SH ASSOCIATED GETS
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\%\f3glGet\fP with argument \%\f3GL_RENDER_MODE\fP
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.SH SEE ALSO
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\%\f3glFeedbackBuffer(3G)\fP,
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\%\f3glRenderMode(3G)\fP
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