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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
2 | <!-- saved from url=(0013)about:internet --> | |
3 | <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="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. | |
15 | The least significant | |
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>, | |
18 | where | |
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, | |
21 | specify a mask. | |
22 | Where a 1 appears in the mask, | |
23 | it's possible to write to the corresponding bit in the stencil buffer. | |
24 | Where a 0 appears, | |
25 | the corresponding bit is write-protected. | |
26 | Initially, all bits are enabled for writing. | |
27 | </p><p> | |
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> |