--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd">
+<!-- saved from url=(0013)about:internet -->
+<?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>glValidateProgram - 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="glValidateProgram"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glValidateProgram — Validates a program object</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><p><code class="funcdef">void <b class="fsfunc">glValidateProgram</b>(</code>GLuint <var class="pdparam">program</var><code>)</code>;</p></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>Specifies the handle of the program object to
+ be validated.</p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p><code class="function">glValidateProgram</code> checks to see
+ whether the executables contained in
+ <em class="parameter"><code>program</code></em> can execute given the current
+ OpenGL state. The information generated by the validation
+ process will be stored in <em class="parameter"><code>program</code></em>'s
+ information log. The validation information may consist of an
+ empty string, or it may be a string containing information about
+ how the current program object interacts with the rest of
+ current OpenGL state. This provides a way for OpenGL
+ implementers to convey more information about why the current
+ program is inefficient, suboptimal, failing to execute, and so
+ on.</p><p>The status of the validation operation will be stored as
+ part of the program object's state. This value will be set to
+ <code class="constant">GL_TRUE</code> if the validation succeeded, and
+ <code class="constant">GL_FALSE</code> otherwise. It can be queried by
+ calling
+ <a href="glGetProgram.xml"><span class="citerefentry"><span class="refentrytitle">glGetProgram</span></span></a>
+ with arguments <em class="parameter"><code>program</code></em> and
+ <code class="constant">GL_VALIDATE_STATUS</code>. If validation is
+ successful, <em class="parameter"><code>program</code></em> is guaranteed to
+ execute given the current state. Otherwise,
+ <em class="parameter"><code>program</code></em> is guaranteed to not execute.</p><p>This function is typically useful only during application
+ development. The informational string stored in the information
+ log is completely implementation dependent; therefore, an
+ application should not expect different OpenGL implementations
+ to produce identical information strings.</p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>This function mimics the validation operation that OpenGL
+ implementations must perform when rendering commands are issued
+ while programmable shaders are part of current state. The error
+ <code class="constant">GL_INVALID_OPERATION</code> will be generated by
+ any command that triggers the rendering of geometry if:</p><div class="itemizedlist"><ul type="disc"><li><p>any two active samplers in the current program
+ object are of different types, but refer to the same
+ texture image unit,</p></li><li><p>the number of active samplers in the program exceeds the maximum
+ number of texture image units allowed.</p></li></ul></div><p>It may be difficult or cause a performance degradation for
+ applications to catch these errors when rendering commands are
+ issued. Therefore, applications are advised to make calls to
+ <code class="function">glValidateProgram</code> to detect these issues
+ during application development.</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 a value generated by
+ OpenGL.</p><p><code class="constant">GL_INVALID_OPERATION</code> is generated if
+ <em class="parameter"><code>program</code></em> is not a program object.</p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p><a href="glGetProgram.xml"><span class="citerefentry"><span class="refentrytitle">glGetProgram</span></span></a>
+ with arguments <em class="parameter"><code>program</code></em> and
+ <code class="constant">GL_VALIDATE_STATUS</code></p><p><a href="glGetProgramInfoLog.xml"><span class="citerefentry"><span class="refentrytitle">glGetProgramInfoLog</span></span></a>
+ with argument <em class="parameter"><code>program</code></em></p><p><a href="glIsProgram.xml"><span class="citerefentry"><span class="refentrytitle">glIsProgram</span></span></a></p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p><a href="glLinkProgram.xml"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>,
+ <a href="glUseProgram.xml"><span class="citerefentry"><span class="refentrytitle">glUseProgram</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>© 2003-2005 3Dlabs Inc. Ltd.
+ 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>