sync code with last improvements from OpenBSD

doc/gl-docs/GL/gl/depthmask.3gl

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+'\" e
+'\"! eqn | mmdoc
+'\"macro stdmacro
+.ds Vn Version 1.2
+.ds Dt 24 September 1999
+.ds Re Release 1.2.1
+.ds Dp Jan 14 18:30
+.ds Dm 01 depthmask
+.ds Xs 13631 3 depthmask.gl
+.TH GLDEPTHMASK 3G
+.SH NAME
+.B "glDepthMask
+\- enable or disable writing into the depth buffer
+
+.SH C SPECIFICATION
+void \f3glDepthMask\fP(
+GLboolean \fIflag\fP )
+.nf
+.fi
+
+.SH PARAMETERS
+.TP \w'\f2flag\fP\ \ 'u 
+\f2flag\fP
+Specifies whether the depth buffer is enabled for writing.
+If \f2flag\fP is \%\f3GL_FALSE\fP,
+depth buffer writing is disabled.
+Otherwise, it is enabled.
+Initially, depth buffer writing is enabled.
+.SH DESCRIPTION
+\%\f3glDepthMask\fP specifies whether the depth buffer is enabled for writing.
+If \f2flag\fP is \%\f3GL_FALSE\fP,
+depth buffer writing is disabled.
+Otherwise, it is enabled.
+Initially, depth buffer writing is enabled.
+.SH ERRORS
+\%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glDepthMask\fP
+is executed between the execution of \%\f3glBegin\fP
+and the corresponding execution of \%\f3glEnd\fP.
+.SH ASSOCIATED GETS
+\%\f3glGet\fP with argument \%\f3GL_DEPTH_WRITEMASK\fP
+.SH SEE ALSO
+\%\f3glColorMask(3G)\fP,
+\%\f3glDepthFunc(3G)\fP,
+\%\f3glDepthRange(3G)\fP,
+\%\f3glIndexMask(3G)\fP,
+\%\f3glStencilMask(3G)\fP