'\" t
.\"     Title: glGetActiveAtomicCounterBufferiv
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
.\"      Date: 05/30/2012
.\"    Manual: [FIXME: manual]
.\"    Source: [FIXME: source]
.\"  Language: English
.\"
.TH "GLGETACTIVEATOMICCOU" "3G" "05/30/2012" "[FIXME: source]" "[FIXME: manual]"
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.SH "NAME"
glGetActiveAtomicCounterBufferiv \- retrieve information about the set of active atomic counter buffers for a program
.SH "C SPECIFICATION"
.HP \w'void\ glGetActiveAtomicCounterBufferiv('u
.BI "void glGetActiveAtomicCounterBufferiv(Gluint\ " "program" ", GLuint\ " "bufferIndex" ", GLenum\ " "pname" ", GLint\ *" "params" ");"
.SH "PARAMETERS"
.PP
\fIprogram\fR
.RS 4
The name of a program object from which to retrieve information\&.
.RE
.PP
\fIbufferIndex\fR
.RS 4
Specifies index of an active atomic counter buffer\&.
.RE
.PP
\fIpname\fR
.RS 4
Specifies which parameter of the atomic counter buffer to retrieve\&.
.RE
.PP
\fIparams\fR
.RS 4
Specifies the address of a variable into which to write the retrieved information\&.
.RE
.SH "DESCRIPTION"
.PP

\fBglGetActiveAtomicCounterBufferiv\fR
retrieves information about the set of active atomic counter buffers for a program object\&.
\fIprogram\fR
is the name of a program object for which the command
\fBglLinkProgram\fR()
has been issued in the past\&. It is not necessary for
\fIprogram\fR
to have been linked successfully\&. The link may have failed because the number of active atomic counters exceeded the limits\&.
.PP

\fIbufferIndex\fR
specifies the index of an active atomic counter buffer and must be in the range zero to the value of
\fBGL_ACTIVE_ATOMIC_COUNTER_BUFFERS\fR
minus one\&. The value of
\fBGL_ACTIVE_ATOMIC_COUNTER_BUFFERS\fR
for
\fIprogram\fR
indicates the number of active atomic counter buffer and can be queried with
\fBglGetProgram\fR()\&.
.PP
If no error occurs, the parameter(s) specified by
\fIpname\fR
are returned in
\fIparams\fR\&. If an error is generated, the contents of
\fIparams\fR
are not modified\&.
.PP
If
\fIpname\fR
is
\fBGL_ATOMIC_COUNTER_BUFFER_BINDING\fR, then the index of the counter buffer binding point associated with the active atomic counter buffer
\fIbufferIndex\fR
for
\fIprogram\fR
is returned\&.
.PP
If
\fIpname\fR
is
\fBGL_ATOMIC_COUNTER_BUFFER_DATA_SIZE\fR, then the implementation\-dependent minimum total buffer object size, in baseic machine units, required to hold all active atomic counters in the atomic counter binding point identified by
\fIbufferIndex\fR
is returned\&.
.PP
If
\fIpname\fR
is
\fBGL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS\fR, then the number of active atomic counters for the atomic counter buffer identified by
\fIbufferIndex\fR
is returned\&.
.PP
If
\fIpname\fR
is
\fBGL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTER_INDICES\fR, then a list of the active atomic counter indices for the atomic counter buffer identified by
\fIbufferIndex\fR
is returned\&. The number of elements that will be written into
\fIparams\fR
is the value of
\fBGL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS\fR
for
\fIbufferIndex\fR\&.
.PP
If
\fIpname\fR
is
\fBGL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_VERTEX_SHADER\fR,
\fBGL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_CONTROL_SHADER\fR,
\fBGL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_EVALUATION_SHADER\fR,
\fBGL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_GEOMETRY_SHADER\fR, or
\fBGL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_FRAGMENT_SHADER\fR, then a boolean value indicating whether the atomic counter buffer identified by
\fIbufferIndex\fR
is referenced by the vertex, tessellation control, tessellation evaluation, geometry or fragment processing stages of
\fIprogram\fR, respectively, is returned\&.
.SH "NOTES"
.PP

\fBglGetActiveAtomicCounterBufferiv\fR
is available only if the GL version is 4\&.2 or higher\&.
.SH "ERRORS"
.PP

\fBGL_INVALID_VALUE\fR
is generated if
\fIprogram\fR
is not the name of a program object for which
\fBglLinkProgram\fR()
has been called in the past\&.
.PP

\fBGL_INVALID_VALUE\fR
is generated if
\fIbufferIndex\fR
is greater than or equal to the value of
\fBGL_ACTIVE_ATOMIC_COUNTER_BUFFERS\fR
for
\fIprogram\fR\&.
.PP

\fBGL_INVALID_ENUM\fR
is generated if
\fIpname\fR
is not one of the accepted tokens\&.
.SH "SEE ALSO"
.PP

\fBglGetProgram\fR(),
\fBglGetActiveSubroutineUniform\fR(),
\fBglGetActiveSubroutineUniformName\fR(),
\fBglGetUniformLocation\fR()
.SH "COPYRIGHT"
.PP
Copyright
\(co
2011 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\&.
\m[blue]\fBhttp://opencontent\&.org/openpub/\fR\m[]\&.