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1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd"> | |
4 | <refentry id="glStencilMaskSeparate"> | |
5 | <refmeta> | |
6 | <refmetainfo> | |
7 | <copyright> | |
8 | <year>1991-2006</year> | |
9 | <holder>Silicon Graphics, Inc.</holder> | |
10 | </copyright> | |
11 | </refmetainfo> | |
12 | <refentrytitle>glStencilMaskSeparate</refentrytitle> | |
13 | <manvolnum>3G</manvolnum> | |
14 | </refmeta> | |
15 | <refnamediv> | |
16 | <refname>glStencilMaskSeparate</refname> | |
17 | <refpurpose>control the front and/or back writing of individual bits in the stencil planes</refpurpose> | |
18 | </refnamediv> | |
19 | <refsynopsisdiv><title>C Specification</title> | |
20 | <funcsynopsis> | |
21 | <funcprototype> | |
22 | <funcdef>void <function>glStencilMaskSeparate</function></funcdef> | |
23 | <paramdef>GLenum <parameter>face</parameter></paramdef> | |
24 | <paramdef>GLuint <parameter>mask</parameter></paramdef> | |
25 | </funcprototype> | |
26 | </funcsynopsis> | |
27 | </refsynopsisdiv> | |
28 | <!-- eqn: ignoring delim $$ --> | |
29 | <refsect1 id="parameters"><title>Parameters</title> | |
30 | <variablelist> | |
31 | <varlistentry> | |
32 | <term><parameter>face</parameter></term> | |
33 | <listitem> | |
34 | <para> | |
35 | Specifies whether the front and/or back stencil writemask is updated. | |
36 | Three symbolic constants are valid: | |
37 | <constant>GL_FRONT</constant>, | |
38 | <constant>GL_BACK</constant>, and | |
39 | <constant>GL_FRONT_AND_BACK</constant>. | |
40 | </para> | |
41 | </listitem> | |
42 | </varlistentry> | |
43 | <varlistentry> | |
44 | <term><parameter>mask</parameter></term> | |
45 | <listitem> | |
46 | <para> | |
47 | Specifies a bit mask to enable and disable writing of individual bits | |
48 | in the stencil planes. | |
49 | Initially, the mask is all 1's. | |
50 | </para> | |
51 | </listitem> | |
52 | </varlistentry> | |
53 | </variablelist> | |
54 | </refsect1> | |
55 | <refsect1 id="description"><title>Description</title> | |
56 | <para> | |
57 | <function>glStencilMaskSeparate</function> controls the writing of individual bits in the stencil planes. | |
58 | The least significant | |
59 | <inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation> | |
60 | bits of <parameter>mask</parameter>, | |
61 | where | |
62 | <inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation> | |
63 | is the number of bits in the stencil buffer, | |
64 | specify a mask. | |
65 | Where a 1 appears in the mask, | |
66 | it's possible to write to the corresponding bit in the stencil buffer. | |
67 | Where a 0 appears, | |
68 | the corresponding bit is write-protected. | |
69 | Initially, all bits are enabled for writing. | |
70 | </para> | |
71 | <para> | |
72 | There can be two separate <parameter>mask</parameter> writemasks; one affects back-facing polygons, and the other | |
73 | affects front-facing polygons as well as other non-polygon primitives. | |
74 | <citerefentry><refentrytitle>glStencilMask</refentrytitle></citerefentry> sets both front | |
75 | and back stencil writemasks to the same values, as if | |
76 | <citerefentry><refentrytitle>glStencilMaskSeparate</refentrytitle></citerefentry> were called | |
77 | with <parameter>face</parameter> set to <constant>GL_FRONT_AND_BACK</constant>. | |
78 | </para> | |
79 | </refsect1> | |
80 | <refsect1 id="notes"><title>Notes</title> | |
81 | <para> | |
82 | <function>glStencilMaskSeparate</function> is available only if | |
83 | the GL version is 2.0 or greater. | |
84 | </para> | |
85 | </refsect1> | |
86 | <refsect1 id="errors"><title>Errors</title> | |
87 | <para> | |
88 | <constant>GL_INVALID_OPERATION</constant> is generated if <function>glStencilMaskSeparate</function> | |
89 | is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> | |
90 | and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>. | |
91 | </para> | |
92 | </refsect1> | |
93 | <refsect1 id="associatedgets"><title>Associated Gets</title> | |
94 | <para> | |
95 | <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument | |
96 | <constant>GL_STENCIL_WRITEMASK</constant>, <constant>GL_STENCIL_BACK_WRITEMASK</constant>, | |
97 | or <constant>GL_STENCIL_BITS</constant> | |
98 | </para> | |
99 | </refsect1> | |
100 | <refsect1 id="seealso"><title>See Also</title> | |
101 | <para> | |
102 | <citerefentry><refentrytitle>glColorMask</refentrytitle></citerefentry>, | |
103 | <citerefentry><refentrytitle>glDepthMask</refentrytitle></citerefentry>, | |
104 | <citerefentry><refentrytitle>glIndexMask</refentrytitle></citerefentry>, | |
105 | <citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry>, | |
106 | <citerefentry><refentrytitle>glStencilFuncSeparate</refentrytitle></citerefentry>, | |
107 | <citerefentry><refentrytitle>glStencilMask</refentrytitle></citerefentry>, | |
108 | <citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>, | |
109 | <citerefentry><refentrytitle>glStencilOpSeparate</refentrytitle></citerefentry> | |
110 | </para> | |
111 | </refsect1> | |
112 | <refsect1 id="Copyright"><title>Copyright</title> | |
113 | <para> | |
114 | Copyright <trademark class="copyright"></trademark> 2006 Khronos Group. | |
115 | This material may be distributed subject to the terms and conditions set forth in | |
116 | the Open Publication License, v 1.0, 8 June 1999. | |
117 | <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>. | |
118 | </para> | |
119 | </refsect1> | |
120 | </refentry> |