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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="glMultiDrawElements"> | |
5 | <refmeta> | |
6 | <refmetainfo> | |
7 | <copyright> | |
8 | <year>1991-2006</year> | |
9 | <holder>Silicon Graphics, Inc.</holder> | |
10 | </copyright> | |
11 | </refmetainfo> | |
12 | <refentrytitle>glMultiDrawElements</refentrytitle> | |
13 | <manvolnum>3G</manvolnum> | |
14 | </refmeta> | |
15 | <refnamediv> | |
16 | <refname>glMultiDrawElements</refname> | |
17 | <refpurpose>render multiple sets of primitives by specifying indices of array data elements</refpurpose> | |
18 | </refnamediv> | |
19 | <refsynopsisdiv><title>C Specification</title> | |
20 | <funcsynopsis> | |
21 | <funcprototype> | |
22 | <funcdef>void <function>glMultiDrawElements</function></funcdef> | |
23 | <paramdef>GLenum <parameter>mode</parameter></paramdef> | |
24 | <paramdef>const GLsizei * <parameter>count</parameter></paramdef> | |
25 | <paramdef>GLenum <parameter>type</parameter></paramdef> | |
26 | <paramdef>const GLvoid ** <parameter>indices</parameter></paramdef> | |
27 | <paramdef>GLsizei <parameter>primcount</parameter></paramdef> | |
28 | </funcprototype> | |
29 | </funcsynopsis> | |
30 | </refsynopsisdiv> | |
31 | <!-- eqn: ignoring delim $$ --> | |
32 | <refsect1 id="parameters"><title>Parameters</title> | |
33 | <variablelist> | |
34 | <varlistentry> | |
35 | <term><parameter>mode</parameter></term> | |
36 | <listitem> | |
37 | <para> | |
38 | Specifies what kind of primitives to render. | |
39 | Symbolic constants | |
40 | <constant>GL_POINTS</constant>, | |
41 | <constant>GL_LINE_STRIP</constant>, | |
42 | <constant>GL_LINE_LOOP</constant>, | |
43 | <constant>GL_LINES</constant>, | |
44 | <constant>GL_TRIANGLE_STRIP</constant>, | |
45 | <constant>GL_TRIANGLE_FAN</constant>, | |
46 | <constant>GL_TRIANGLES</constant>, | |
47 | <constant>GL_QUAD_STRIP</constant>, | |
48 | <constant>GL_QUADS</constant>, | |
49 | and <constant>GL_POLYGON</constant> are accepted. | |
50 | </para> | |
51 | </listitem> | |
52 | </varlistentry> | |
53 | <varlistentry> | |
54 | <term><parameter>count</parameter></term> | |
55 | <listitem> | |
56 | <para> | |
57 | Points to an array of the elements counts. | |
58 | </para> | |
59 | </listitem> | |
60 | </varlistentry> | |
61 | <varlistentry> | |
62 | <term><parameter>type</parameter></term> | |
63 | <listitem> | |
64 | <para> | |
65 | Specifies the type of the values in <parameter>indices</parameter>. Must be one of | |
66 | <constant>GL_UNSIGNED_BYTE</constant>, <constant>GL_UNSIGNED_SHORT</constant>, or | |
67 | <constant>GL_UNSIGNED_INT</constant>. | |
68 | </para> | |
69 | </listitem> | |
70 | </varlistentry> | |
71 | <varlistentry> | |
72 | <term><parameter>indices</parameter></term> | |
73 | <listitem> | |
74 | <para> | |
75 | Specifies a pointer to the location where the indices are stored. | |
76 | </para> | |
77 | </listitem> | |
78 | </varlistentry> | |
79 | <varlistentry> | |
80 | <term><parameter>primcount</parameter></term> | |
81 | <listitem> | |
82 | <para> | |
83 | Specifies the size of the <parameter>count</parameter> array. | |
84 | </para> | |
85 | </listitem> | |
86 | </varlistentry> | |
87 | </variablelist> | |
88 | </refsect1> | |
89 | <refsect1 id="description"><title>Description</title> | |
90 | <para> | |
91 | <function>glMultiDrawElements</function> specifies multiple sets of geometric primitives with very few subroutine | |
92 | calls. Instead of calling a GL function to pass each individual vertex, | |
93 | normal, texture coordinate, edge flag, or color, you can prespecify | |
94 | separate arrays of vertices, normals, and so on, and use them to construct a | |
95 | sequence of primitives with a single call to <function>glMultiDrawElements</function>. | |
96 | </para> | |
97 | <para> | |
98 | <function>glMultiDrawElements</function> is identical in operation to <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry> except that | |
99 | <parameter>primcount</parameter> separate lists of elements are specified. | |
100 | </para> | |
101 | <para> | |
102 | Vertex attributes that are modified by <function>glMultiDrawElements</function> have an | |
103 | unspecified value after <function>glMultiDrawElements</function> returns. For example, if | |
104 | <constant>GL_COLOR_ARRAY</constant> is enabled, the value of the current color is | |
105 | undefined after <function>glMultiDrawElements</function> executes. Attributes that aren't | |
106 | modified maintain their previous values. | |
107 | </para> | |
108 | </refsect1> | |
109 | <refsect1 id="notes"><title>Notes</title> | |
110 | <para> | |
111 | <function>glMultiDrawElements</function> is available only if the GL version is 1.4 or greater. | |
112 | </para> | |
113 | <para> | |
114 | <function>glMultiDrawElements</function> is included in display lists. If <function>glMultiDrawElements</function> is entered into a | |
115 | display list, | |
116 | the necessary array data (determined by the array pointers and | |
117 | enables) is also | |
118 | entered into the display list. Because the array pointers and | |
119 | enables are client-side state, their values affect display lists | |
120 | when the lists are created, not when the lists are executed. | |
121 | </para> | |
122 | </refsect1> | |
123 | <refsect1 id="errors"><title>Errors</title> | |
124 | <para> | |
125 | <constant>GL_INVALID_ENUM</constant> is generated if <parameter>mode</parameter> is not an accepted value. | |
126 | </para> | |
127 | <para> | |
128 | <constant>GL_INVALID_VALUE</constant> is generated if <parameter>primcount</parameter> is negative. | |
129 | </para> | |
130 | <para> | |
131 | <constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to an | |
132 | enabled array or the element array and the buffer object's data store is currently mapped. | |
133 | </para> | |
134 | <para> | |
135 | <constant>GL_INVALID_OPERATION</constant> is generated if <function>glMultiDrawElements</function> is executed between | |
136 | the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>. | |
137 | </para> | |
138 | </refsect1> | |
139 | <refsect1 id="seealso"><title>See Also</title> | |
140 | <para> | |
141 | <citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>, | |
142 | <citerefentry><refentrytitle>glColorPointer</refentrytitle></citerefentry>, | |
143 | <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>, | |
144 | <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>, | |
145 | <citerefentry><refentrytitle>glEdgeFlagPointer</refentrytitle></citerefentry>, | |
146 | <citerefentry><refentrytitle>glFogCoordPointer</refentrytitle></citerefentry>, | |
147 | <citerefentry><refentrytitle>glGetPointerv</refentrytitle></citerefentry>, | |
148 | <citerefentry><refentrytitle>glIndexPointer</refentrytitle></citerefentry>, | |
149 | <citerefentry><refentrytitle>glInterleavedArrays</refentrytitle></citerefentry>, | |
150 | <citerefentry><refentrytitle>glNormalPointer</refentrytitle></citerefentry>, | |
151 | <citerefentry><refentrytitle>glSecondaryColorPointer</refentrytitle></citerefentry>, | |
152 | <citerefentry><refentrytitle>glTexCoordPointer</refentrytitle></citerefentry>, | |
153 | <citerefentry><refentrytitle>glVertexPointer</refentrytitle></citerefentry> | |
154 | </para> | |
155 | </refsect1> | |
156 | <refsect1 id="Copyright"><title>Copyright</title> | |
157 | <para> | |
158 | Copyright <trademark class="copyright"></trademark> 1991-2006 | |
159 | Silicon Graphics, Inc. This document is licensed under the SGI | |
160 | Free Software B License. For details, see | |
161 | <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>. | |
162 | </para> | |
163 | </refsect1> | |
164 | </refentry> |