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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=
"glGetProgramStage"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glGetProgramStage — retrieve properties of a program object corresponding to a specified shader stage
</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">glGetProgramStageiv
</b>(
</code></td><td>GLuint
</td><td><var class=
"pdparam">program
</var>,
</td></tr><tr><td> </td><td>GLenum
</td><td><var class=
"pdparam">shadertype
</var>,
</td></tr><tr><td> </td><td>GLenum
</td><td><var class=
"pdparam">pname
</var>,
</td></tr><tr><td> </td><td>GLint *
</td><td><var class=
"pdparam">values
</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>
5 Specifies the name of the program containing shader stage.
6 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>shadertype
</code></em></span></dt><dd><p>
7 Specifies the shader stage from which to query for the subroutine parameter.
<em class=
"parameter"><code>shadertype
</code></em>
8 must be one of
<code class=
"constant">GL_VERTEX_SHADER
</code>,
<code class=
"constant">GL_TESS_CONTROL_SHADER
</code>,
9 <code class=
"constant">GL_TESS_EVALUATION_SHADER
</code>,
<code class=
"constant">GL_GEOMETRY_SHADER
</code> or
10 <code class=
"constant">GL_FRAGMENT_SHADER
</code>.
11 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>pname
</code></em></span></dt><dd><p>
12 Specifies the parameter of the shader to query.
<em class=
"parameter"><code>pname
</code></em>
13 must be
<code class=
"constant">GL_ACTIVE_SUBROUTINE_UNIFORMS
</code>,
14 <code class=
"constant">GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS
</code>,
15 <code class=
"constant">GL_ACTIVE_SUBROUTINES
</code>,
16 <code class=
"constant">GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH
</code>,
17 or
<code class=
"constant">GL_ACTIVE_SUBROUTINE_MAX_LENGTH
</code>.
18 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>values
</code></em></span></dt><dd><p>
19 Specifies the address of a variable into which the queried value or values will be placed.
20 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
21 <code class=
"function">glGetProgramStage
</code> queries a parameter of a shader stage attached to a program object.
22 <em class=
"parameter"><code>program
</code></em> contains the name of the program to which the shader is attached.
<em class=
"parameter"><code>shadertype
</code></em>
23 specifies the stage from which to query the parameter.
<em class=
"parameter"><code>pname
</code></em> specifies which parameter
24 should be queried. The value or values of the parameter to be queried is returned in the variable whose address
25 is given in
<em class=
"parameter"><code>values
</code></em>.
27 If
<em class=
"parameter"><code>pname
</code></em> is
<code class=
"constant">GL_ACTIVE_SUBROUTINE_UNIFORMS
</code>, the number
28 of active subroutine variables in the stage is returned in
<em class=
"parameter"><code>values
</code></em>.
30 If
<em class=
"parameter"><code>pname
</code></em> is
<code class=
"constant">GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS
</code>,
31 the number of active subroutine variable locations in the stage is returned in
<em class=
"parameter"><code>values
</code></em>.
33 If
<em class=
"parameter"><code>pname
</code></em> is
<code class=
"constant">GL_ACTIVE_SUBROUTINES
</code>,
34 the number of active subroutines in the stage is returned in
<em class=
"parameter"><code>values
</code></em>.
36 If
<em class=
"parameter"><code>pname
</code></em> is
<code class=
"constant">GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH
</code>,
37 the length of the longest subroutine uniform for the stage is returned in
<em class=
"parameter"><code>values
</code></em>.
39 If
<em class=
"parameter"><code>pname
</code></em> is
<code class=
"constant">GL_ACTIVE_SUBROUTINE_MAX_LENGTH
</code>,
40 the length of the longest subroutine name for the stage is returned in
<em class=
"parameter"><code>values
</code></em>. The
41 returned name length includes space for the null-terminator.
43 If there is no shader present of type
<em class=
"parameter"><code>shadertype
</code></em>, the returned value will be consistent
44 with a shader containing no subroutines or subroutine uniforms.
45 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
46 <code class=
"constant">GL_INVALID_ENUM
</code> is generated if
<em class=
"parameter"><code>shadertype
</code></em> or
<em class=
"parameter"><code>pname
</code></em>
47 is not one of the accepted values.
49 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if
<em class=
"parameter"><code>program
</code></em> is not the name of an
50 existing program object.
51 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
52 <a href=
"glGetProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetProgram
</span></span></a>
53 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
54 Copyright
<span class=
"trademark"></span>©
2010 Khronos Group.
55 This material may be distributed subject to the terms and conditions set forth in
56 the Open Publication License, v
1.0,
8 June
1999.
57 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
58 </p></div></div></body></html>