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GLGETACTIVEATOMICCOU(3G)	 OpenGL Manual	      GLGETACTIVEATOMICCOU(3G)

NAME
       glGetActiveAtomicCounterBufferiv - retrieve information about the set
       of active atomic counter buffers for a program

C SPECIFICATION
       void glGetActiveAtomicCounterBufferiv(Gluint program,
					     GLuint bufferIndex, GLenum pname,
					     GLint *params);

PARAMETERS
       program
	   The name of a program object from which to retrieve information.

       bufferIndex
	   Specifies index of an active atomic counter buffer.

       pname
	   Specifies which parameter of the atomic counter buffer to retrieve.

       params
	   Specifies the address of a variable into which to write the
	   retrieved information.

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

       bufferIndex specifies the index of an active atomic counter buffer and
       must be in the range zero to the value of
       GL_ACTIVE_ATOMIC_COUNTER_BUFFERS minus one. The value of
       GL_ACTIVE_ATOMIC_COUNTER_BUFFERS for program indicates the number of
       active atomic counter buffer and can be queried with glGetProgram().

       If no error occurs, the parameter(s) specified by pname are returned in
       params. If an error is generated, the contents of params are not
       modified.

       If pname is GL_ATOMIC_COUNTER_BUFFER_BINDING, then the index of the
       counter buffer binding point associated with the active atomic counter
       buffer bufferIndex for program is returned.

       If pname is GL_ATOMIC_COUNTER_BUFFER_DATA_SIZE, 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 bufferIndex is returned.

       If pname is GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS, then the
       number of active atomic counters for the atomic counter buffer
       identified by bufferIndex is returned.

       If pname is GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTER_INDICES,
       then a list of the active atomic counter indices for the atomic counter
       buffer identified by bufferIndex is returned. The number of elements
       that will be written into params is the value of
       GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS for bufferIndex.

       If pname is GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_VERTEX_SHADER,
       GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_CONTROL_SHADER,
       GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_EVALUATION_SHADER,
       GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_GEOMETRY_SHADER,
       GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_FRAGMENT_SHADER,
       GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER then a boolean
       value indicating whether the atomic counter buffer identified by
       bufferIndex is referenced by the vertex, tessellation control,
       tessellation evaluation, geometry, fragment or compute processing
       stages of program, respectively, is returned.

NOTES
       glGetActiveAtomicCounterBufferiv is available only if the GL version is
       4.2 or higher.

       GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER is available only
       of the GL version is 4.3 or higher.

ERRORS
       GL_INVALID_VALUE is generated if program is not the name of a program
       object for which glLinkProgram() has been called in the past.

       GL_INVALID_VALUE is generated if bufferIndex is greater than or equal
       to the value of GL_ACTIVE_ATOMIC_COUNTER_BUFFERS for program.

       GL_INVALID_ENUM is generated if pname is not one of the accepted
       tokens.

SEE ALSO
       glGetProgram(), glGetActiveSubroutineUniform(),
       glGetActiveSubroutineUniformName(), glGetUniformLocation()

COPYRIGHT
       Copyright © 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.  http://opencontent.org/openpub/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013	      GLGETACTIVEATOMICCOU(3G)

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