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<?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><link rel="stylesheet" type="text/css" href="opengl-man.css" /><title>glDrawTransformFeedbackStream - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glDrawTransformFeedbackStream"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glDrawTransformFeedbackStream — render primitives using a count derived from a specifed stream of a transform feedback object</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glDrawTransformFeedbackStream</b>(</code></td><td>GLenum  </td><td><var class="pdparam">mode</var>, </td></tr><tr><td> </td><td>GLuint  </td><td><var class="pdparam">id</var>, </td></tr><tr><td> </td><td>GLuint  </td><td><var class="pdparam">stream</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>mode</code></em></span></dt><dd><p>
                    Specifies what kind of primitives to render.
                    Symbolic constants
                    <code class="constant">GL_POINTS</code>,
                    <code class="constant">GL_LINE_STRIP</code>,
                    <code class="constant">GL_LINE_LOOP</code>,
                    <code class="constant">GL_LINES</code>,
                    <code class="constant">GL_LINE_STRIP_ADJACENCY</code>,
                    <code class="constant">GL_LINES_ADJACENCY</code>,
                    <code class="constant">GL_TRIANGLE_STRIP</code>,
                    <code class="constant">GL_TRIANGLE_FAN</code>,
                    <code class="constant">GL_TRIANGLES</code>,
                    <code class="constant">GL_TRIANGLE_STRIP_ADJACENCY</code>,
                    <code class="constant">GL_TRIANGLES_ADJACENCY</code>, and
                    <code class="constant">GL_PATCHES</code>
                    are accepted.
                </p></dd><dt><span class="term"><em class="parameter"><code>id</code></em></span></dt><dd><p>
                    Specifies the name of a transform feedback object from which to retrieve a primitive count.
                </p></dd><dt><span class="term"><em class="parameter"><code>stream</code></em></span></dt><dd><p>
                    Specifies the index of the transform feedback stream from which to retrieve a primitive count.
                </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
            <code class="function">glDrawTransformFeedbackStream</code> draws primitives of a type specified by <em class="parameter"><code>mode</code></em> using
            a count retrieved from the transform feedback stream specified by <em class="parameter"><code>stream</code></em> of the transform feedback object
            specified by <em class="parameter"><code>id</code></em>. Calling <code class="function">glDrawTransformFeedbackStream</code>
            is equivalent to calling <a href="glDrawArrays.xml"><span class="citerefentry"><span class="refentrytitle">glDrawArrays</span></span></a> with <em class="parameter"><code>mode</code></em>
            as specified, <em class="parameter"><code>first</code></em> set to zero, and <em class="parameter"><code>count</code></em> set to the number of vertices captured
            on vertex stream <em class="parameter"><code>stream</code></em> the last time transform feedback was active on the transform feedback object named
            by <em class="parameter"><code>id</code></em>.
        </p><p>
            Calling <a href="glDrawTransformFeedback.xml"><span class="citerefentry"><span class="refentrytitle">glDrawTransformFeedback</span></span></a> is equivalent to calling <code class="function">glDrawTransformFeedbackStream</code>
            with <em class="parameter"><code>stream</code></em> set to zero.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
            <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>mode</code></em> is not an accepted value.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>id</code></em> is not the name of a transform feedback
            object.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>stream</code></em> is greater than or equal to
            the value of <code class="constant">GL_MAX_VERTEX_STREAMS</code>.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> 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.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if a geometry shader is active and <em class="parameter"><code>mode</code></em>
            is incompatible with the input primitive type of the geometry shader in the currently installed program object.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>mode</code></em> is <code class="constant">GL_PATCHES</code>
            and no tessellation control shader is active.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if <a href="glEndTransformFeedback.xml"><span class="citerefentry"><span class="refentrytitle">glEndTransformFeedback</span></span></a>
            has never been called while the transform feedback object named by <em class="parameter"><code>id</code></em> was bound.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
            <a href="glDrawArrays.xml"><span class="citerefentry"><span class="refentrytitle">glDrawArrays</span></span></a>,
            <a href="glDrawArraysInstanced.xml"><span class="citerefentry"><span class="refentrytitle">glDrawArraysInstanced</span></span></a>,
            <a href="glDrawElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawElements</span></span></a>,
            <a href="glDrawRangeElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawRangeElements</span></span></a>,
            <a href="glDrawTransformFeedback.xml"><span class="citerefentry"><span class="refentrytitle">glDrawTransformFeedback</span></span></a>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
            Copyright <span class="trademark"></span>© 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.
            <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
        </p></div></div></body></html>
