1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd">
<?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 V1.78.1" /></head><body><div class="refentry"><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"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glValidateProgram</strong>(</code></td><td>GLuint <var class="pdparam">program</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>Specifies the handle of the program object to
be validated.</p></dd></dl></div></div><div class="refsect1"><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 class="citerefentry" 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"><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 class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><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 class="listitem"><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"><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"><a id="associatedgets"></a><h2>Associated Gets</h2><p><a class="citerefentry" 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 class="citerefentry" 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 class="citerefentry" href="glIsProgram.xml"><span class="citerefentry"><span class="refentrytitle">glIsProgram</span></span></a></p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p><a class="citerefentry" href="glLinkProgram.xml"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>,
<a class="citerefentry" href="glUseProgram.xml"><span class="citerefentry"><span class="refentrytitle">glUseProgram</span></span></a></p></div><div class="refsect1"><a id="Copyright"></a><h2>Copyright</h2><p>
Copyright <span class="trademark"></span>© 2003-2005 3Dlabs Inc. Ltd.
Copyright <span class="trademark"></span>© 2010-2013 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>.
</p></div></div></body></html>
|
