<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd"> <refentry id="glDrawRangeElementsBaseVertex"> <refmeta> <refmetainfo> <copyright> <year>2010</year> <holder>Khronos Group</holder> </copyright> </refmetainfo> <refentrytitle>glDrawRangeElementsBaseVertex</refentrytitle> <manvolnum>3G</manvolnum> </refmeta> <refnamediv> <refname>glDrawRangeElementsBaseVertex</refname> <refpurpose>render primitives from array data with a per-element offset</refpurpose> </refnamediv> <refsynopsisdiv><title>C Specification</title> <funcsynopsis> <funcprototype> <funcdef>void <function>glDrawRangeElementsBaseVertex</function></funcdef> <paramdef>GLenum <parameter>mode</parameter></paramdef> <paramdef>GLuint <parameter>start</parameter></paramdef> <paramdef>GLuint <parameter>end</parameter></paramdef> <paramdef>GLsizei <parameter>count</parameter></paramdef> <paramdef>GLenum <parameter>type</parameter></paramdef> <paramdef>GLvoid *<parameter>indices</parameter></paramdef> <paramdef>GLint <parameter>basevertex</parameter></paramdef> </funcprototype> </funcsynopsis> </refsynopsisdiv> <!-- eqn: ignoring delim $$ --> <refsect1 id="parameters"><title>Parameters</title> <variablelist> <varlistentry> <term><parameter>mode</parameter></term> <listitem> <para> Specifies what kind of primitives to render. Symbolic constants <constant>GL_POINTS</constant>, <constant>GL_LINE_STRIP</constant>, <constant>GL_LINE_LOOP</constant>, <constant>GL_LINES</constant>, <constant>GL_TRIANGLE_STRIP</constant>, <constant>GL_TRIANGLE_FAN</constant>, <constant>GL_TRIANGLES</constant>, <constant>GL_LINES_ADJACENCY</constant>, <constant>GL_LINE_STRIP_ADJACENCY</constant>, <constant>GL_TRIANGLES_ADJACENCY</constant>, <constant>GL_TRIANGLE_STRIP_ADJACENCY</constant> and <constant>GL_PATCHES</constant> are accepted. </para> </listitem> </varlistentry> <varlistentry> <term><parameter>start</parameter></term> <listitem> <para> Specifies the minimum array index contained in <parameter>indices</parameter>. </para> </listitem> </varlistentry> <varlistentry> <term><parameter>end</parameter></term> <listitem> <para> Specifies the maximum array index contained in <parameter>indices</parameter>. </para> </listitem> </varlistentry> <varlistentry> <term><parameter>count</parameter></term> <listitem> <para> Specifies the number of elements to be rendered. </para> </listitem> </varlistentry> <varlistentry> <term><parameter>type</parameter></term> <listitem> <para> Specifies the type of the values in indices. Must be one of <constant>GL_UNSIGNED_BYTE</constant>, <constant>GL_UNSIGNED_SHORT</constant>, or <constant>GL_UNSIGNED_INT</constant>. </para> </listitem> </varlistentry> <varlistentry> <term><parameter>indices</parameter></term> <listitem> <para> Specifies a pointer to the location where the indices are stored. </para> </listitem> </varlistentry> <varlistentry> <term><parameter>basevertex</parameter></term> <listitem> <para> Specifies a constant that should be added to each element of <parameter>indices</parameter> when chosing elements from the enabled vertex arrays. </para> </listitem> </varlistentry> </variablelist> </refsect1> <refsect1 id="description"><title>Description</title> <para> <function>glDrawRangeElementsBaseVertex</function> is a restricted form of <citerefentry><refentrytitle>glDrawElementsBaseVertex</refentrytitle></citerefentry>. <parameter>mode</parameter>, <parameter>start</parameter>, <parameter>end</parameter>, <parameter>count</parameter> and <parameter>basevertex</parameter> match the corresponding arguments to <citerefentry><refentrytitle>glDrawElementsBaseVertex</refentrytitle></citerefentry>, with the additional constraint that all values in the array <parameter>indices</parameter> must lie between <parameter>start</parameter> and <parameter>end</parameter>, inclusive, prior to adding <parameter>basevertex</parameter>. Index values lying outside the range [<parameter>start</parameter>, <parameter>end</parameter>] are treated in the same way as <citerefentry><refentrytitle>glDrawElementsBaseVertex</refentrytitle></citerefentry>. The <emphasis>i</emphasis>th element transferred by the corresponding draw call will be taken from element <parameter>indices</parameter>[i] + <parameter>basevertex</parameter> of each enabled array. If the resulting value is larger than the maximum value representable by <parameter>type</parameter>, it is as if the calculation were upconverted to 32-bit unsigned integers (with wrapping on overflow conditions). The operation is undefined if the sum would be negative. </para> </refsect1> <refsect1 id="errors"><title>Errors</title> <para> <constant>GL_INVALID_ENUM</constant> is generated if <parameter>mode</parameter> is not an accepted value. </para> <para> <constant>GL_INVALID_VALUE</constant> is generated if <parameter>count</parameter> is negative. </para> <para> <constant>GL_INVALID_VALUE</constant> is generated if <parameter>end</parameter> < <parameter>start</parameter>. </para> <para> <constant>GL_INVALID_OPERATION</constant> is generated if a geometry shader is active and <parameter>mode</parameter> is incompatible with the input primitive type of the geometry shader in the currently installed program object. </para> <para> <constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to an enabled array or the element array and the buffer object's data store is currently mapped. </para> </refsect1> <refsect1 id="seealso"><title>See Also</title> <para> <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawElementsBaseVertex</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawElementsInstanced</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawElementsInstancedBaseVertex</refentrytitle></citerefentry> </para> </refsect1> <refsect1 id="Copyright"><title>Copyright</title> <para> Copyright <trademark class="copyright"></trademark> 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>. </para> </refsect1> </refentry>