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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>glTransformFeedbackVaryings - 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="glTransformFeedbackVaryings"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glTransformFeedbackVaryings — specify values to record in transform feedback buffers</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">glTransformFeedbackVaryings</b>(</code></td><td>GLuint </td><td><var class="pdparam">program</var>, </td></tr><tr><td> </td><td>GLsizei </td><td><var class="pdparam">count</var>, </td></tr><tr><td> </td><td>const char ** </td><td><var class="pdparam">varyings</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">bufferMode</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>program</code></em></span></dt><dd><p>
+ The name of the target program object.
+ </p></dd><dt><span class="term"><em class="parameter"><code>count</code></em></span></dt><dd><p>
+ The number of varying variables used for transform feedback.
+ </p></dd><dt><span class="term"><em class="parameter"><code>varyings</code></em></span></dt><dd><p>
+ An array of <em class="parameter"><code>count</code></em> zero-terminated strings specifying the
+ names of the varying variables to use for transform feedback.
+ </p></dd><dt><span class="term"><em class="parameter"><code>bufferMode</code></em></span></dt><dd><p>
+ Identifies the mode used to capture the varying variables when transform feedback is active.
+ <em class="parameter"><code>bufferMode</code></em> must be <code class="constant">GL_INTERLEAVED_ATTRIBS</code> or <code class="constant">GL_SEPARATE_ATTRIBS</code>.
+ </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
+ The names of the vertex or geometry shader outputs to be recorded in transform feedback mode
+ are specified using <code class="function">glTransformFeedbackVaryings</code>. When a geometry shader
+ is active, transform feedback records the values of selected geometry shader output variables
+ from the emitted vertices. Otherwise, the values of the selected vertex shader outputs are
+ recorded.
+ </p><p>
+ The state set by <code class="function">glTranformFeedbackVaryings</code> is stored and takes effect
+ next time <a href="glLinkProgram.xml"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a> is called
+ on <em class="parameter"><code>program</code></em>. When <a href="glLinkProgram.xml"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>
+ is called, <em class="parameter"><code>program</code></em> is linked so that the values of the specified varying variables
+ for the vertices of each primitive generated by the GL are written to a single buffer
+ object if <em class="parameter"><code>bufferMode</code></em> is <code class="constant">GL_INTERLEAVED_ATTRIBS</code> or multiple
+ buffer objects if <em class="parameter"><code>bufferMode</code></em> is <code class="constant">GL_SEPARATE_ATTRIBS</code>.
+ </p><p>
+ In addition to the errors generated by <code class="function">glTransformFeedbackVaryings</code>, the
+ program <em class="parameter"><code>program</code></em> will fail to link if:
+ </p><div class="itemizedlist"><ul type="disc"><li><p>
+ The count specified by <code class="function">glTransformFeedbackVaryings</code> is non-zero, but the
+ program object has no vertex or geometry shader.
+ </p></li><li><p>
+ Any variable name specified in the <em class="parameter"><code>varyings</code></em> array is not declared as an output
+ in the vertex shader (or the geometry shader, if active).
+ </p></li><li><p>
+ Any two entries in the <em class="parameter"><code>varyings</code></em> array specify the same varying variable.
+ </p></li><li><p>
+ The total number of components to capture in any varying variable in <em class="parameter"><code>varyings</code></em>
+ is greater than the constant <code class="constant">GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS</code>
+ and the buffer mode is <code class="constant">GL_SEPARATE_ATTRIBS</code>.
+ </p></li><li><p>
+ The total number of components to capture is greater than the constant
+ <code class="constant">GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS</code> and the buffer
+ mode is <code class="constant">GL_INTERLEAVED_ATTRIBS</code>.
+ </p></li></ul></div><p>
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
+ <code class="function">glGetTransformFeedbackVarying</code> is available only if the GL version is 3.0 or greater.
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
+ <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>program</code></em> is not
+ the name of a program object.
+ </p><p>
+ <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>bufferMode</code></em> is <code class="constant">GL_SEPARATE_ATTRIBS</code>
+ and <em class="parameter"><code>count</code></em> is greater than the implementation-dependent limit <code class="constant">GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS</code>.
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
+ <a href="glGetTransformFeedbackVarying.xml"><span class="citerefentry"><span class="refentrytitle">glGetTransformFeedbackVarying</span></span></a>
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
+ <a href="glBeginTransformFeedback.xml"><span class="citerefentry"><span class="refentrytitle">glBeginTransformFeedback</span></span></a>,
+ <a href="glEndTransformFeedback.xml"><span class="citerefentry"><span class="refentrytitle">glEndTransformFeedback</span></span></a>,
+ <a href="glGetTransformFeedbackVarying.xml"><span class="citerefentry"><span class="refentrytitle">glGetTransformFeedbackVarying</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>
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