142 lines
3.8 KiB
Plaintext
142 lines
3.8 KiB
Plaintext
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'\" te
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'\"! tbl|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 drawbuffe
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.ds Xs 38775 6 drawbuffer.gl
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.TH GLDRAWBUFFER 3G
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.SH NAME
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.B "glDrawBuffer
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\- specify which color buffers are to be drawn into
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.SH C SPECIFICATION
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void \f3glDrawBuffer\fP(
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GLenum \fImode\fP )
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.nf
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.fi
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.EQ
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delim $$
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.EN
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.SH PARAMETERS
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.TP \w'\f2mode\fP\ \ 'u
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\f2mode\fP
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Specifies up to four color buffers to be drawn into.
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Symbolic constants
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\%\f3GL_NONE\fP,
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\%\f3GL_FRONT_LEFT\fP,
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\%\f3GL_FRONT_RIGHT\fP,
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\%\f3GL_BACK_LEFT\fP,
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\%\f3GL_BACK_RIGHT\fP,
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\%\f3GL_FRONT\fP,
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\%\f3GL_BACK\fP,
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\%\f3GL_LEFT\fP,
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\%\f3GL_RIGHT\fP,
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\%\f3GL_FRONT_AND_BACK\fP, and
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\%\f3GL_AUX\fP\f2i\fP,
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where \f2i\fP is between 0 and
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.br
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``\%\f3GL_AUX_BUFFERS\fP'' \-1,
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are accepted (\%\f3GL_AUX_BUFFERS\fP is not the upper limit; use \%\f3glGet\fP
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to query the number of available aux buffers.)
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The initial value is \%\f3GL_FRONT\fP for single-buffered contexts,
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and \%\f3GL_BACK\fP for double-buffered contexts.
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.SH DESCRIPTION
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When colors are written to the frame buffer,
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they are written into the color buffers specified by \%\f3glDrawBuffer\fP.
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The specifications are as follows:
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.TP 25
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\%\f3GL_NONE\fP
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No color buffers are written.
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.TP
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\%\f3GL_FRONT_LEFT\fP
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Only the front left color buffer is written.
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.TP
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\%\f3GL_FRONT_RIGHT\fP
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Only the front right color buffer is written.
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.TP
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\%\f3GL_BACK_LEFT\fP
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Only the back left color buffer is written.
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.TP
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\%\f3GL_BACK_RIGHT\fP
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Only the back right color buffer is written.
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.TP
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\%\f3GL_FRONT\fP
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Only the front left and front right color buffers are written.
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If there is no front right color buffer,
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only the front left color buffer is written.
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.TP
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\%\f3GL_BACK\fP
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Only the back left and back right color buffers are written.
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If there is no back right color buffer,
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only the back left color buffer is written.
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.TP
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\%\f3GL_LEFT\fP
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Only the front left and back left color buffers are written.
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If there is no back left color buffer,
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only the front left color buffer is written.
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.TP
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\%\f3GL_RIGHT\fP
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Only the front right and back right color buffers are written.
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If there is no back right color buffer,
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only the front right color buffer is written.
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.BP
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.TP
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\%\f3GL_FRONT_AND_BACK\fP
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All the front and back color buffers
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(front left, front right, back left, back right)
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are written.
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If there are no back color buffers,
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only the front left and front right color buffers are written.
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If there are no right color buffers,
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only the front left and back left color buffers are written.
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If there are no right or back color buffers,
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only the front left color buffer is written.
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.TP
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\%\f3GL_AUX\fP\f2i\fP
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Only auxiliary color buffer \f2i\fP is written.
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.P
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If more than one color buffer is selected for drawing,
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then blending or logical operations are computed and applied independently
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for each color buffer and can produce different results in each buffer.
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.P
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Monoscopic contexts include only
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.I left
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buffers, and stereoscopic contexts include both
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.I left
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and
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.I right
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buffers.
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Likewise, single-buffered contexts include only
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.I front
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buffers, and double-buffered contexts include both
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.I front
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and
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.I back
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buffers.
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The context is selected at GL initialization.
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.SH NOTES
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It is always the case that \%\f3GL_AUX\fP$i$ = \%\f3GL_AUX0\fP + $i$.
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.SH ERRORS
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\%\f3GL_INVALID_ENUM\fP is generated if \f2mode\fP is not an accepted value.
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.P
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\%\f3GL_INVALID_OPERATION\fP is generated if none of the buffers indicated
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by \f2mode\fP exists.
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.P
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\%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glDrawBuffer\fP
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is executed between the execution of \%\f3glBegin\fP
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and the corresponding execution of \%\f3glEnd\fP.
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.SH ASSOCIATED GETS
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\%\f3glGet\fP with argument \%\f3GL_DRAW_BUFFER\fP
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.br
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\%\f3glGet\fP with argument \%\f3GL_AUX_BUFFERS\fP
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.SH SEE ALSO
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\%\f3glBlendFunc(3G)\fP,
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\%\f3glColorMask(3G)\fP,
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\%\f3glIndexMask(3G)\fP,
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\%\f3glLogicOp(3G)\fP,
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\%\f3glReadBuffer(3G)\fP
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