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239 lines
12 KiB
XML
239 lines
12 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glDrawRangeElements">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glDrawRangeElements</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glDrawRangeElements</refname>
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<refpurpose>render primitives from array data</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glDrawRangeElements</function></funcdef>
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<paramdef>GLenum <parameter>mode</parameter></paramdef>
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<paramdef>GLuint <parameter>start</parameter></paramdef>
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<paramdef>GLuint <parameter>end</parameter></paramdef>
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<paramdef>GLsizei <parameter>count</parameter></paramdef>
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<paramdef>GLenum <parameter>type</parameter></paramdef>
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<paramdef>const GLvoid * <parameter>indices</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>mode</parameter></term>
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<listitem>
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<para>
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Specifies what kind of primitives to render.
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Symbolic constants
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<constant>GL_POINTS</constant>,
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<constant>GL_LINE_STRIP</constant>,
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<constant>GL_LINE_LOOP</constant>,
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<constant>GL_LINES</constant>,
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<constant>GL_TRIANGLE_STRIP</constant>,
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<constant>GL_TRIANGLE_FAN</constant>,
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<constant>GL_TRIANGLES</constant>,
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<constant>GL_QUAD_STRIP</constant>,
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<constant>GL_QUADS</constant>,
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and <constant>GL_POLYGON</constant> are accepted.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>start</parameter></term>
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<listitem>
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<para>
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Specifies the minimum array index contained in <parameter>indices</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>end</parameter></term>
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<listitem>
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<para>
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Specifies the maximum array index contained in <parameter>indices</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>count</parameter></term>
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<listitem>
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<para>
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Specifies the number of elements to be rendered.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>type</parameter></term>
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<listitem>
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<para>
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Specifies the type of the values in <parameter>indices</parameter>. Must be one of
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<constant>GL_UNSIGNED_BYTE</constant>, <constant>GL_UNSIGNED_SHORT</constant>, or
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<constant>GL_UNSIGNED_INT</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>indices</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to the location where the indices are stored.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>glDrawRangeElements</function> is a restricted form of <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>. <parameter>mode</parameter>, <parameter>start</parameter>, <parameter>end</parameter>,
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and <parameter>count</parameter> match the corresponding arguments to <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>, with
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the additional constraint that all values in the arrays <parameter>count</parameter> must lie
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between <parameter>start</parameter> and <parameter>end</parameter>, inclusive.
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</para>
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<para>
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Implementations denote recommended maximum amounts of vertex and
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index data,
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which may be queried by calling <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument
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<constant>GL_MAX_ELEMENTS_VERTICES</constant> and <constant>GL_MAX_ELEMENTS_INDICES</constant>.
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If
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<inlineequation><mml:math>
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<!-- eqn: end - start + 1:-->
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<mml:mrow>
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<mml:mi mathvariant="italic">end</mml:mi>
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<mml:mo>-</mml:mo>
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<mml:mi mathvariant="italic">start</mml:mi>
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<mml:mo>+</mml:mo>
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<mml:mn>1</mml:mn>
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</mml:mrow>
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</mml:math></inlineequation>
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is greater than the value of
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<constant>GL_MAX_ELEMENTS_VERTICES</constant>, or if <parameter>count</parameter> is greater than the value of
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<constant>GL_MAX_ELEMENTS_INDICES</constant>, then the call may operate at reduced
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performance. There is no requirement that all vertices in the range
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<inlineequation><mml:math>
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<!-- eqn: [start, end]:-->
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<mml:mfenced open="[" close="]">
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<mml:mi mathvariant="italic">start</mml:mi>
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<mml:mi mathvariant="italic">end</mml:mi>
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</mml:mfenced>
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</mml:math></inlineequation>
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be referenced. However, the implementation may
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partially process unused vertices, reducing performance from what could
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be achieved with an optimal index set.
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</para>
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<para>
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When <function>glDrawRangeElements</function> is called, it uses <parameter>count</parameter> sequential elements from an
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enabled array, starting at <parameter>start</parameter> to construct a sequence of
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geometric primitives. <parameter>mode</parameter> specifies what kind of primitives are
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constructed, and how the array elements construct these primitives. If
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more than one array is enabled, each is used. If
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<constant>GL_VERTEX_ARRAY</constant> is not enabled, no geometric primitives are
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constructed.
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</para>
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<para>
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Vertex attributes that are modified by <function>glDrawRangeElements</function> have an
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unspecified value after <function>glDrawRangeElements</function> returns. For example, if
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<constant>GL_COLOR_ARRAY</constant> is enabled, the value of the current color is
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undefined after <function>glDrawRangeElements</function> executes. Attributes that aren't
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modified maintain their previous values.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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<function>glDrawRangeElements</function> is available only if the GL version is 1.2 or greater.
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</para>
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<para>
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<function>glDrawRangeElements</function> is included in display lists. If <function>glDrawRangeElements</function> is entered into a
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display list,
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the necessary array data (determined by the array pointers and
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enables) is also
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entered into the display list. Because the array pointers and
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enables are client-side state, their values affect display lists
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when the lists are created, not when the lists are executed.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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It is an error for indices to lie outside the range
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<inlineequation><mml:math>
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<!-- eqn: [start, end]:-->
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<mml:mfenced open="[" close="]">
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<mml:mi mathvariant="italic">start</mml:mi>
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<mml:mi mathvariant="italic">end</mml:mi>
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</mml:mfenced>
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</mml:math></inlineequation>,
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but implementations may not check for this situation. Such indices
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cause implementation-dependent behavior.
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</para>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>mode</parameter> is not an accepted value.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>count</parameter> is negative.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if
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<inlineequation><mml:math>
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<!-- eqn: end < start:-->
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<mml:mrow>
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<mml:mi mathvariant="italic">end</mml:mi>
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<mml:mo><</mml:mo>
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<mml:mi mathvariant="italic">start</mml:mi>
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</mml:mrow>
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</mml:math></inlineequation>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to an
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enabled array or the element array and the buffer object's data store is currently mapped.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glDrawRangeElements</function> is executed between
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the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAX_ELEMENTS_VERTICES</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAX_ELEMENTS_INDICES</constant>
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glColorPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glEdgeFlagPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetPointerv</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glIndexPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glInterleavedArrays</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glNormalPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glSecondaryColorPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexCoordPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glVertexPointer</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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