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108 lines
5.3 KiB
XML
108 lines
5.3 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glStencilMask">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glStencilMask</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glStencilMask</refname>
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<refpurpose>control the front and back writing of individual bits in the stencil planes</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glStencilMask</function></funcdef>
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<paramdef>GLuint <parameter>mask</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>mask</parameter></term>
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<listitem>
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<para>
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Specifies a bit mask to enable and disable writing of individual bits
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in the stencil planes.
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Initially, the mask is all 1's.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>glStencilMask</function> controls the writing of individual bits in the stencil planes.
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The least significant
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<inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation>
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bits of <parameter>mask</parameter>,
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where
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<inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation>
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is the number of bits in the stencil buffer,
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specify a mask.
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Where a 1 appears in the mask,
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it's possible to write to the corresponding bit in the stencil buffer.
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Where a 0 appears,
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the corresponding bit is write-protected.
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Initially, all bits are enabled for writing.
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</para>
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<para>
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There can be two separate <parameter>mask</parameter> writemasks; one affects back-facing polygons, and the other
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affects front-facing polygons as well as other non-polygon primitives.
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<citerefentry><refentrytitle>glStencilMask</refentrytitle></citerefentry> sets both front
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and back stencil writemasks to the same values. Use <citerefentry><refentrytitle>glStencilMaskSeparate</refentrytitle></citerefentry>
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to set front and back stencil writemasks to different values.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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<citerefentry><refentrytitle>glStencilMask</refentrytitle></citerefentry> is the same as
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calling <citerefentry><refentrytitle>glStencilMaskSeparate</refentrytitle></citerefentry>
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with <parameter>face</parameter> set to <constant>GL_FRONT_AND_BACK</constant>.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glStencilMask</function>
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is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
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and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument
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<constant>GL_STENCIL_WRITEMASK</constant>, <constant>GL_STENCIL_BACK_WRITEMASK</constant>,
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or <constant>GL_STENCIL_BITS</constant>
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glColorMask</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDepthMask</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glIndexMask</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glStencilFuncSeparate</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glStencilMaskSeparate</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glStencilOpSeparate</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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