mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-27 08:35:32 +00:00
145 lines
6.7 KiB
XML
145 lines
6.7 KiB
XML
<?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="glDrawElements">
|
|
<refmeta>
|
|
<refmetainfo>
|
|
<copyright>
|
|
<year>1991-2006</year>
|
|
<holder>Silicon Graphics, Inc.</holder>
|
|
</copyright>
|
|
</refmetainfo>
|
|
<refentrytitle>glDrawElements</refentrytitle>
|
|
<manvolnum>3G</manvolnum>
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname>glDrawElements</refname>
|
|
<refpurpose>render primitives from array data</refpurpose>
|
|
</refnamediv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>glDrawElements</function></funcdef>
|
|
<paramdef>GLenum <parameter>mode</parameter></paramdef>
|
|
<paramdef>GLsizei <parameter>count</parameter></paramdef>
|
|
<paramdef>GLenum <parameter>type</parameter></paramdef>
|
|
<paramdef>const GLvoid * <parameter>indices</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>, and
|
|
<constant>GL_TRIANGLES</constant> are accepted.
|
|
</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 <parameter>indices</parameter>. Must be
|
|
<constant>GL_UNSIGNED_BYTE</constant> or <constant>GL_UNSIGNED_SHORT</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>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="description"><title>Description</title>
|
|
<para>
|
|
<function>glDrawElements</function> specifies multiple geometric primitives
|
|
with very few subroutine calls. Instead of calling a GL function
|
|
to pass each vertex attribute, you can use
|
|
<citerefentry><refentrytitle>glVertexAttribPointer</refentrytitle></citerefentry>
|
|
to prespecify separate arrays of vertex attributes and use them to
|
|
construct a sequence of primitives with a single
|
|
call to <function>glDrawElements</function>.
|
|
</para>
|
|
<para>
|
|
When <function>glDrawElements</function> is called, it uses <parameter>count</parameter> sequential elements from an
|
|
enabled array, starting at <parameter>indices</parameter> to construct a sequence of
|
|
geometric primitives. <parameter>mode</parameter> specifies what kind of primitives are
|
|
constructed and how the array elements construct these primitives. If
|
|
more than one array is enabled, each is used.
|
|
</para>
|
|
<para>
|
|
To enable and disable a generic vertex attribute array, call
|
|
<citerefentry><refentrytitle>glEnableVertexAttribArray</refentrytitle></citerefentry>
|
|
and
|
|
<citerefentry><refentrytitle>glDisableVertexAttribArray</refentrytitle></citerefentry>.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
<para>
|
|
If the current program object, as set by
|
|
<citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry>,
|
|
is invalid, rendering results are undefined. However, no error is generated
|
|
for this case.
|
|
</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_ENUM</constant> is generated if <parameter>type</parameter> is not
|
|
<constant>GL_UNSIGNED_BYTE</constant> or <constant>GL_UNSIGNED_SHORT</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>count</parameter> is negative.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_FRAMEBUFFER_OPERATION</constant> is generated if
|
|
the currently bound framebuffer is not framebuffer complete (i.e. the
|
|
return value from <citerefentry><refentrytitle>glCheckFramebufferStatus</refentrytitle></citerefentry>
|
|
is not <constant>GL_FRAMEBUFFER_COMPLETE</constant>).
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glCheckFramebufferStatus</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glDisableVertexAttribArray</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glEnableVertexAttribArray</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glVertexAttribPointer</refentrytitle></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"></trademark> 1991-2006
|
|
Silicon Graphics, Inc. This document is licensed under the SGI
|
|
Free Software B License. For details, see
|
|
<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|