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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 V1.78.1" /></head><body><div class="refentry"><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" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glTransformFeedbackVaryings</strong>(</code></td><td>GLuint<var class="pdparam">program</var>, </td></tr><tr><td> </td><td>GLsizei<var class="pdparam">count</var>, </td></tr><tr><td> </td><td>const char **<var class="pdparam">varyings</var>, </td></tr><tr><td> </td><td>GLenum<var class="pdparam">bufferMode</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><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"><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 class="citerefentry" 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 class="citerefentry" 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 class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><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 class="listitem"><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 class="listitem"><p>
Any two entries in the <em class="parameter"><code>varyings</code></em> array specify the same varying variable.
</p></li><li class="listitem"><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 class="listitem"><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"><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"><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"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
<a class="citerefentry" href="glGetTransformFeedbackVarying.xml"><span class="citerefentry"><span class="refentrytitle">glGetTransformFeedbackVarying</span></span></a>
</p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
<a class="citerefentry" href="glBeginTransformFeedback.xml"><span class="citerefentry"><span class="refentrytitle">glBeginTransformFeedback</span></span></a>,
<a class="citerefentry" href="glEndTransformFeedback.xml"><span class="citerefentry"><span class="refentrytitle">glEndTransformFeedback</span></span></a>,
<a class="citerefentry" href="glGetTransformFeedbackVarying.xml"><span class="citerefentry"><span class="refentrytitle">glGetTransformFeedbackVarying</span></span></a>
</p></div><div class="refsect1"><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 class="ulink" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
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