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GLGETHISTOGRAMPARAME(3G)					   OpenGL Manual					  GLGETHISTOGRAMPARAME(3G)

NAME
       glGetHistogramParameter - get histogram parameters

C SPECIFICATION
       void glGetHistogramParameterfv(GLenum target, GLenum pname, GLfloat * params);

       void glGetHistogramParameteriv(GLenum target, GLenum pname, GLint * params);

PARAMETERS
       target
	   Must be one of GL_HISTOGRAM or GL_PROXY_HISTOGRAM.

       pname
	   The name of the parameter to be retrieved. Must be one of GL_HISTOGRAM_WIDTH, GL_HISTOGRAM_FORMAT, GL_HISTOGRAM_RED_SIZE,
	   GL_HISTOGRAM_GREEN_SIZE, GL_HISTOGRAM_BLUE_SIZE, GL_HISTOGRAM_ALPHA_SIZE, GL_HISTOGRAM_LUMINANCE_SIZE, or GL_HISTOGRAM_SINK.

       params
	   Pointer to storage for the returned values.

DESCRIPTION
       glGetHistogramParameter is used to query parameter values for the current histogram or for a proxy. The histogram state information may be
       queried by calling glGetHistogramParameter with a target of GL_HISTOGRAM (to obtain information for the current histogram table) or
       GL_PROXY_HISTOGRAM (to obtain information from the most recent proxy request) and one of the following values for the pname argument:

       +----------------------------------+-------------------------------------------+
       |				  |					      |
       |			Parameter |			    Description       |
       |				  |					      |
       +----------------------------------+-------------------------------------------+
       |GL_HISTOGRAM_WIDTH		  | Histogram table width		      |
       +----------------------------------+-------------------------------------------+
       |GL_HISTOGRAM_FORMAT		  | Internal format			      |
       +----------------------------------+-------------------------------------------+
       |GL_HISTOGRAM_RED_SIZE		  | Red component counter size, in bits       |
       +----------------------------------+-------------------------------------------+
       |GL_HISTOGRAM_GREEN_SIZE 	  | Green component counter size, in bits     |
       +----------------------------------+-------------------------------------------+
       |GL_HISTOGRAM_BLUE_SIZE		  | Blue component counter size, in bits      |
       +----------------------------------+-------------------------------------------+
       |GL_HISTOGRAM_ALPHA_SIZE 	  | Alpha component counter size, in bits     |
       +----------------------------------+-------------------------------------------+
       |GL_HISTOGRAM_LUMINANCE_SIZE	  | Luminance component counter size, in bits |
       +----------------------------------+-------------------------------------------+
       |GL_HISTOGRAM_SINK		  | Value of the sink parameter 	      |
       +----------------------------------+-------------------------------------------+

NOTES
       glGetHistogramParameter is present only if ARB_imaging is returned when glGetString() is called with an argument of GL_EXTENSIONS.

ERRORS
       GL_INVALID_ENUM is generated if target is not one of the allowable values.

       GL_INVALID_ENUM is generated if pname is not one of the allowable values.

       GL_INVALID_OPERATION is generated if glGetHistogramParameter is executed between the execution of glBegin() and the corresponding execution
       of glEnd().

SEE ALSO
       glGetHistogram(), glHistogram()

COPYRIGHT
       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org							    06/10/2014						  GLGETHISTOGRAMPARAME(3G)