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renderer=
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"text/html; charset=UTF-8" /><title>glStencilMaskSeparate
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glStencilMaskSeparate"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glStencilMaskSeparate — control the front and/or back writing of individual bits in the stencil planes
</p></div><div class=
"refsynopsisdiv"><h2>C Specification
</h2><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">void
<b class=
"fsfunc">glStencilMaskSeparate
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">face
</var>,
</td></tr><tr><td> </td><td>GLuint
</td><td><var class=
"pdparam">mask
</var><code>)
</code>;
</td></tr></table></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"parameters"></a><h2>Parameters
</h2><div class=
"variablelist"><dl><dt><span class=
"term"><em class=
"parameter"><code>face
</code></em></span></dt><dd><p>
4 Specifies whether the front and/or back stencil writemask is updated.
5 Three symbolic constants are valid:
6 <code class=
"constant">GL_FRONT
</code>,
7 <code class=
"constant">GL_BACK
</code>, and
8 <code class=
"constant">GL_FRONT_AND_BACK
</code>.
9 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>mask
</code></em></span></dt><dd><p>
10 Specifies a bit mask to enable and disable writing of individual bits
11 in the stencil planes.
12 Initially, the mask is all
1's.
13 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
14 <code class=
"function">glStencilMaskSeparate
</code> controls the writing of individual bits in the stencil planes.
16 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">n
</mml:mi></mml:math>
17 bits of
<em class=
"parameter"><code>mask
</code></em>,
19 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">n
</mml:mi></mml:math>
20 is the number of bits in the stencil buffer,
22 Where a
1 appears in the mask,
23 it's possible to write to the corresponding bit in the stencil buffer.
25 the corresponding bit is write-protected.
26 Initially, all bits are enabled for writing.
28 There can be two separate
<em class=
"parameter"><code>mask
</code></em> writemasks; one affects back-facing polygons, and the other
29 affects front-facing polygons as well as other non-polygon primitives.
30 <a class=
"citerefentry" href=
"glStencilMask.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glStencilMask
</span></span></a> sets both front
31 and back stencil writemasks to the same values, as if
32 <a class=
"citerefentry" href=
"glStencilMaskSeparate.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glStencilMaskSeparate
</span></span></a> were called
33 with
<em class=
"parameter"><code>face
</code></em> set to
<code class=
"constant">GL_FRONT_AND_BACK
</code>.
34 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
35 <code class=
"function">glStencilMaskSeparate
</code> is available only if
36 the GL version is
2.0 or greater.
37 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
38 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<code class=
"function">glStencilMaskSeparate
</code>
39 is executed between the execution of
<a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a>
40 and the corresponding execution of
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a>.
41 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"associatedgets"></a><h2>Associated Gets
</h2><p>
42 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
43 <code class=
"constant">GL_STENCIL_WRITEMASK
</code>,
<code class=
"constant">GL_STENCIL_BACK_WRITEMASK
</code>,
44 or
<code class=
"constant">GL_STENCIL_BITS
</code>
45 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
46 <a class=
"citerefentry" href=
"glColorMask.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glColorMask
</span></span></a>,
47 <a class=
"citerefentry" href=
"glDepthMask.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDepthMask
</span></span></a>,
48 <a class=
"citerefentry" href=
"glIndexMask.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glIndexMask
</span></span></a>,
49 <a class=
"citerefentry" href=
"glStencilFunc.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glStencilFunc
</span></span></a>,
50 <a class=
"citerefentry" href=
"glStencilFuncSeparate.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glStencilFuncSeparate
</span></span></a>,
51 <a class=
"citerefentry" href=
"glStencilMask.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glStencilMask
</span></span></a>,
52 <a class=
"citerefentry" href=
"glStencilOp.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glStencilOp
</span></span></a>,
53 <a class=
"citerefentry" href=
"glStencilOpSeparate.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glStencilOpSeparate
</span></span></a>
54 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
55 Copyright
<span class=
"trademark"></span>©
2006 Khronos Group.
56 This material may be distributed subject to the terms and conditions set forth in
57 the Open Publication License, v
1.0,
8 June
1999.
58 <a class=
"ulink" href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
59 </p></div></div></body></html>