glGetHistogramParameter man page on Darwin

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GLGETHISTOGRAMPARAMETER(3G)			   GLGETHISTOGRAMPARAMETER(3G)

NAME
       glGetHistogramParameterfv,  glGetHistogramParameteriv  -	 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  cur‐
       rent  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
	GL_HISTOGRAM_RED_SIZE	       Red component counter size, in bits
	GL_HISTOGRAM_GREEN_SIZE	       Green component counter size, in bits

	Parameter		       Description
	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 GL_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 val‐
       ues.

       GL_INVALID_ENUM is generated if pname is not one of the allowable  val‐
       ues.

       GL_INVALID_OPERATION  is	 generated  if glGetHistogramParameter is exe‐
       cuted between the execution of glBegin and the corresponding  execution
       of glEnd.

SEE ALSO
       glGetHistogram, glHistogram

						   GLGETHISTOGRAMPARAMETER(3G)
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