2013-10-10 23:58:54 +00:00
<?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= "glDrawTransformFeedbackStream" >
2013-11-03 11:43:50 +00:00
<refentryinfo >
<copyright >
<year > 2010-2013</year>
<holder > Khronos Group.</holder>
</copyright>
</refentryinfo>
2013-10-10 23:58:54 +00:00
<refmeta >
<refentrytitle > glDrawTransformFeedbackStream</refentrytitle>
<manvolnum > 3G</manvolnum>
</refmeta>
<refnamediv >
<refname > glDrawTransformFeedbackStream</refname>
<refpurpose > render primitives using a count derived from a specifed stream of a transform feedback object</refpurpose>
</refnamediv>
<refsynopsisdiv > <title > C Specification</title>
<funcsynopsis >
<funcprototype >
<funcdef > void <function > glDrawTransformFeedbackStream</function> </funcdef>
<paramdef > GLenum <parameter > mode</parameter> </paramdef>
<paramdef > GLuint <parameter > id</parameter> </paramdef>
<paramdef > GLuint <parameter > stream</parameter> </paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<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_LINE_STRIP_ADJACENCY</constant> ,
<constant > GL_LINES_ADJACENCY</constant> ,
<constant > GL_TRIANGLE_STRIP</constant> ,
<constant > GL_TRIANGLE_FAN</constant> ,
<constant > GL_TRIANGLES</constant> ,
<constant > GL_TRIANGLE_STRIP_ADJACENCY</constant> ,
<constant > GL_TRIANGLES_ADJACENCY</constant> , and
<constant > GL_PATCHES</constant>
are accepted.
</para>
</listitem>
</varlistentry>
<varlistentry >
<term > <parameter > id</parameter> </term>
<listitem >
<para >
Specifies the name of a transform feedback object from which to retrieve a primitive count.
</para>
</listitem>
</varlistentry>
<varlistentry >
<term > <parameter > stream</parameter> </term>
<listitem >
<para >
Specifies the index of the transform feedback stream from which to retrieve a primitive count.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id= "description" > <title > Description</title>
<para >
<function > glDrawTransformFeedbackStream</function> draws primitives of a type specified by <parameter > mode</parameter> using
a count retrieved from the transform feedback stream specified by <parameter > stream</parameter> of the transform feedback object
specified by <parameter > id</parameter> . Calling <function > glDrawTransformFeedbackStream</function>
is equivalent to calling <citerefentry > <refentrytitle > glDrawArrays</refentrytitle> </citerefentry> with <parameter > mode</parameter>
as specified, <parameter > first</parameter> set to zero, and <parameter > count</parameter> set to the number of vertices captured
on vertex stream <parameter > stream</parameter> the last time transform feedback was active on the transform feedback object named
by <parameter > id</parameter> .
</para>
<para >
2013-10-23 18:17:08 +00:00
Calling <citerefentry > <refentrytitle > glDrawTransformFeedback</refentrytitle> </citerefentry> is equivalent to calling <function > glDrawTransformFeedbackStream</function>
2013-10-10 23:58:54 +00:00
with <parameter > stream</parameter> set to zero.
</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 > id</parameter> is not the name of a transform feedback
object.
</para>
<para >
<constant > GL_INVALID_VALUE</constant> is generated if <parameter > stream</parameter> is greater than or equal to
the value of <constant > GL_MAX_VERTEX_STREAMS</constant> .
</para>
<para >
<constant > GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to an
enabled array and the buffer object's data store is currently mapped.
</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 <parameter > mode</parameter> is <constant > GL_PATCHES</constant>
and no tessellation control shader is active.
</para>
<para >
<constant > GL_INVALID_OPERATION</constant> is generated if <citerefentry > <refentrytitle > glEndTransformFeedback</refentrytitle> </citerefentry>
has never been called while the transform feedback object named by <parameter > id</parameter> was bound.
</para>
</refsect1>
<refsect1 id= "seealso" > <title > See Also</title>
<para >
<citerefentry > <refentrytitle > glDrawArrays</refentrytitle> </citerefentry> ,
<citerefentry > <refentrytitle > glDrawArraysInstanced</refentrytitle> </citerefentry> ,
<citerefentry > <refentrytitle > glDrawElements</refentrytitle> </citerefentry> ,
<citerefentry > <refentrytitle > glDrawRangeElements</refentrytitle> </citerefentry> ,
<citerefentry > <refentrytitle > glDrawTransformFeedback</refentrytitle> </citerefentry>
</para>
</refsect1>
<refsect1 id= "Copyright" > <title > Copyright</title>
<para >
2013-11-03 11:43:50 +00:00
Copyright <trademark class= "copyright" > </trademark> 2010-2013 Khronos Group.
This material may be distributed subject to the terms and conditions set forth in
2013-10-10 23:58:54 +00:00
the Open Publication License, v 1.0, 8 June 1999.
<ulink url= "http://opencontent.org/openpub/" > http://opencontent.org/openpub/</ulink> .
</para>
</refsect1>
</refentry>
