Commit | Line | Data |
---|---|---|
7faf1d71 AW |
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="glDrawElements"> | |
5 | <refmeta> | |
6 | <refmetainfo> | |
7 | <copyright> | |
8 | <year>1991-2006</year> | |
9 | <holder>Silicon Graphics, Inc.</holder> | |
10 | </copyright> | |
11 | </refmetainfo> | |
12 | <refentrytitle>glDrawElements</refentrytitle> | |
13 | <manvolnum>3G</manvolnum> | |
14 | </refmeta> | |
15 | <refnamediv> | |
16 | <refname>glDrawElements</refname> | |
17 | <refpurpose>render primitives from array data</refpurpose> | |
18 | </refnamediv> | |
19 | <refsynopsisdiv><title>C Specification</title> | |
20 | <funcsynopsis> | |
21 | <funcprototype> | |
22 | <funcdef>void <function>glDrawElements</function></funcdef> | |
23 | <paramdef>GLenum <parameter>mode</parameter></paramdef> | |
24 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
25 | <paramdef>GLenum <parameter>type</parameter></paramdef> | |
26 | <paramdef>const GLvoid * <parameter>indices</parameter></paramdef> | |
27 | </funcprototype> | |
28 | </funcsynopsis> | |
29 | </refsynopsisdiv> | |
30 | <!-- eqn: ignoring delim $$ --> | |
31 | <refsect1 id="parameters"><title>Parameters</title> | |
32 | <variablelist> | |
33 | <varlistentry> | |
34 | <term><parameter>mode</parameter></term> | |
35 | <listitem> | |
36 | <para> | |
37 | Specifies what kind of primitives to render. | |
38 | Symbolic constants | |
39 | <constant>GL_POINTS</constant>, | |
40 | <constant>GL_LINE_STRIP</constant>, | |
41 | <constant>GL_LINE_LOOP</constant>, | |
42 | <constant>GL_LINES</constant>, | |
43 | <constant>GL_LINE_STRIP_ADJACENCY</constant>, | |
44 | <constant>GL_LINES_ADJACENCY</constant>, | |
45 | <constant>GL_TRIANGLE_STRIP</constant>, | |
46 | <constant>GL_TRIANGLE_FAN</constant>, | |
47 | <constant>GL_TRIANGLES</constant>, | |
48 | <constant>GL_TRIANGLE_STRIP_ADJACENCY</constant> and | |
49 | <constant>GL_TRIANGLES_ADJACENCY</constant> | |
50 | are accepted. | |
51 | </para> | |
52 | </listitem> | |
53 | </varlistentry> | |
54 | <varlistentry> | |
55 | <term><parameter>count</parameter></term> | |
56 | <listitem> | |
57 | <para> | |
58 | Specifies the number of elements to be rendered. | |
59 | </para> | |
60 | </listitem> | |
61 | </varlistentry> | |
62 | <varlistentry> | |
63 | <term><parameter>type</parameter></term> | |
64 | <listitem> | |
65 | <para> | |
66 | Specifies the type of the values in <parameter>indices</parameter>. Must be one of | |
67 | <constant>GL_UNSIGNED_BYTE</constant>, <constant>GL_UNSIGNED_SHORT</constant>, or | |
68 | <constant>GL_UNSIGNED_INT</constant>. | |
69 | </para> | |
70 | </listitem> | |
71 | </varlistentry> | |
72 | <varlistentry> | |
73 | <term><parameter>indices</parameter></term> | |
74 | <listitem> | |
75 | <para> | |
76 | Specifies a pointer to the location where the indices are stored. | |
77 | </para> | |
78 | </listitem> | |
79 | </varlistentry> | |
80 | </variablelist> | |
81 | </refsect1> | |
82 | <refsect1 id="description"><title>Description</title> | |
83 | <para> | |
84 | <function>glDrawElements</function> specifies multiple geometric primitives | |
85 | with very few subroutine calls. Instead of calling a GL function | |
86 | to pass each individual vertex, normal, texture coordinate, edge | |
87 | flag, or color, you can prespecify | |
88 | separate arrays of vertices, normals, and so on, and use them to | |
89 | construct a sequence of primitives with a single | |
90 | call to <function>glDrawElements</function>. | |
91 | </para> | |
92 | <para> | |
93 | When <function>glDrawElements</function> is called, it uses <parameter>count</parameter> sequential elements from an | |
94 | enabled array, starting at <parameter>indices</parameter> to construct a sequence of | |
95 | geometric primitives. <parameter>mode</parameter> specifies what kind of primitives are | |
96 | constructed and how the array elements construct these primitives. If | |
97 | more than one array is enabled, each is used. | |
98 | </para> | |
99 | <para> | |
100 | Vertex attributes that are modified by <function>glDrawElements</function> have an | |
101 | unspecified value after <function>glDrawElements</function> returns. Attributes that aren't | |
102 | modified maintain their previous values. | |
103 | </para> | |
104 | </refsect1> | |
105 | <refsect1 id="notes"><title>Notes</title> | |
106 | <para> | |
107 | <constant>GL_LINE_STRIP_ADJACENCY</constant>, | |
108 | <constant>GL_LINES_ADJACENCY</constant>, | |
109 | <constant>GL_TRIANGLE_STRIP_ADJACENCY</constant> and | |
110 | <constant>GL_TRIANGLES_ADJACENCY</constant> | |
111 | are available only if the GL version is 3.2 or greater. | |
112 | </para> | |
113 | </refsect1> | |
114 | <refsect1 id="errors"><title>Errors</title> | |
115 | <para> | |
116 | <constant>GL_INVALID_ENUM</constant> is generated if <parameter>mode</parameter> is not an accepted value. | |
117 | </para> | |
118 | <para> | |
119 | <constant>GL_INVALID_VALUE</constant> is generated if <parameter>count</parameter> is negative. | |
120 | </para> | |
121 | <para> | |
122 | <constant>GL_INVALID_OPERATION</constant> is generated if a geometry shader is active and <parameter>mode</parameter> | |
123 | is incompatible with the input primitive type of the geometry shader in the currently installed program object. | |
124 | </para> | |
125 | <para> | |
126 | <constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to an | |
127 | enabled array or the element array and the buffer object's data store is currently mapped. | |
128 | </para> | |
129 | </refsect1> | |
130 | <refsect1 id="seealso"><title>See Also</title> | |
131 | <para> | |
132 | <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>, | |
133 | <citerefentry><refentrytitle>glDrawElementsInstanced</refentrytitle></citerefentry>, | |
134 | <citerefentry><refentrytitle>glDrawElementsBaseVertex</refentrytitle></citerefentry>, | |
135 | <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry> | |
136 | </para> | |
137 | </refsect1> | |
138 | <refsect1 id="Copyright"><title>Copyright</title> | |
139 | <para> | |
140 | Copyright <trademark class="copyright"></trademark> 1991-2006 | |
141 | Silicon Graphics, Inc. This document is licensed under the SGI | |
142 | Free Software B License. For details, see | |
143 | <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>. | |
144 | </para> | |
145 | </refsect1> | |
146 | </refentry> |