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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=
"glGetActiveAtomicCounterBufferiv"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glGetActiveAtomicCounterBufferiv — retrieve information about the set of active atomic counter buffers for a program
</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">glGetActiveAtomicCounterBufferiv
</b>(
</code></td><td>Gluint
</td><td><var class=
"pdparam">program
</var>,
</td></tr><tr><td> </td><td>GLuint
</td><td><var class=
"pdparam">bufferIndex
</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">params
</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 The name of a program object from which to retrieve information.
6 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>bufferIndex
</code></em></span></dt><dd><p>
7 Specifies index of an active atomic counter buffer.
8 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>pname
</code></em></span></dt><dd><p>
9 Specifies which parameter of the atomic counter buffer to retrieve.
10 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>params
</code></em></span></dt><dd><p>
11 Specifies the address of a variable into which to write the retrieved information.
12 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
13 <code class=
"function">glGetActiveAtomicCounterBufferiv
</code> retrieves information about the set of active
14 atomic counter buffers for a program object.
<em class=
"parameter"><code>program
</code></em> is the name of a program
15 object for which the command
<a href=
"glLinkProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glLinkProgram
</span></span></a>
16 has been issued in the past. It is not necessary for
<em class=
"parameter"><code>program
</code></em> to have been linked
17 successfully. The link may have failed because the number of active atomic counters exceeded the limits.
19 <em class=
"parameter"><code>bufferIndex
</code></em> specifies the index of an active atomic counter buffer and must be in
20 the range zero to the value of
<code class=
"constant">GL_ACTIVE_ATOMIC_COUNTER_BUFFERS
</code> minus one. The value
21 of
<code class=
"constant">GL_ACTIVE_ATOMIC_COUNTER_BUFFERS
</code> for
<em class=
"parameter"><code>program
</code></em> indicates the
22 number of active atomic counter buffer and can be queried with
23 <a href=
"glGetProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetProgram
</span></span></a>.
25 If no error occurs, the parameter(s) specified by
<em class=
"parameter"><code>pname
</code></em> are returned in
<em class=
"parameter"><code>params
</code></em>.
26 If an error is generated, the contents of
<em class=
"parameter"><code>params
</code></em> are not modified.
28 If
<em class=
"parameter"><code>pname
</code></em> is
<code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_BINDING
</code>, then the index of the
29 counter buffer binding point associated with the active atomic counter buffer
<em class=
"parameter"><code>bufferIndex
</code></em>
30 for
<em class=
"parameter"><code>program
</code></em> is returned.
32 If
<em class=
"parameter"><code>pname
</code></em> is
<code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_DATA_SIZE
</code>, then the implementation-dependent
33 minimum total buffer object size, in baseic machine units, required to hold all active atomic counters in the
34 atomic counter binding point identified by
<em class=
"parameter"><code>bufferIndex
</code></em> is returned.
36 If
<em class=
"parameter"><code>pname
</code></em> is
<code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS
</code>, then the number of active
37 atomic counters for the atomic counter buffer identified by
<em class=
"parameter"><code>bufferIndex
</code></em> is returned.
39 If
<em class=
"parameter"><code>pname
</code></em> is
<code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTER_INDICES
</code>,
40 then a list of the active atomic counter indices for the atomic counter buffer identified by
<em class=
"parameter"><code>bufferIndex
</code></em>
41 is returned. The number of elements that will be written into
<em class=
"parameter"><code>params
</code></em> is the value of
42 <code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS
</code> for
<em class=
"parameter"><code>bufferIndex
</code></em>.
44 If
<em class=
"parameter"><code>pname
</code></em> is
<code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_VERTEX_SHADER
</code>,
45 <code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_CONTROL_SHADER
</code>,
46 <code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_EVALUATION_SHADER
</code>,
47 <code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_GEOMETRY_SHADER
</code>,
48 <code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_FRAGMENT_SHADER
</code>,
49 <code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER
</code> then a boolean value indicating
50 whether the atomic counter buffer identified by
<em class=
"parameter"><code>bufferIndex
</code></em> is referenced by the vertex,
51 tessellation control, tessellation evaluation, geometry, fragment or compute processing stages of
<em class=
"parameter"><code>program
</code></em>,
52 respectively, is returned.
53 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
54 <code class=
"function">glGetActiveAtomicCounterBufferiv
</code> is available only if the
55 GL version is
4.2 or higher.
57 <code class=
"constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER
</code> is available
58 only of the GL version is
4.3 or higher.
59 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
60 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if
<em class=
"parameter"><code>program
</code></em> is not the name of a program
61 object for which
<a href=
"glLinkProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glLinkProgram
</span></span></a> has been called in the past.
63 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if
<em class=
"parameter"><code>bufferIndex
</code></em> is greater than or equal to
64 the value of
<code class=
"constant">GL_ACTIVE_ATOMIC_COUNTER_BUFFERS
</code> for
<em class=
"parameter"><code>program
</code></em>.
66 <code class=
"constant">GL_INVALID_ENUM
</code> is generated if
<em class=
"parameter"><code>pname
</code></em> is not one of the accepted tokens.
67 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
68 <a href=
"glGetProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetProgram
</span></span></a>,
69 <a href=
"glGetActiveSubroutineUniform.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetActiveSubroutineUniform
</span></span></a>,
70 <a href=
"glGetActiveSubroutineUniformName.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetActiveSubroutineUniformName
</span></span></a>,
71 <a href=
"glGetUniformLocation.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetUniformLocation
</span></span></a>
72 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
73 Copyright
<span class=
"trademark"></span>©
2011 Khronos Group.
74 This material may be distributed subject to the terms and conditions set forth in
75 the Open Publication License, v
1.0,
8 June
1999.
76 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
77 </p></div></div></body></html>