glGetHistogramParameter(3G)    OpenGL Reference	   glGetHistogramParameter(3G)

NAME    [Toc]    [Back]

     glGetHistogramParameterfv,	glGetHistogramParameteriv - get	histogram
     parameters

C SPECIFICATION    [Toc]    [Back]

     void glGetHistogramParameterfv( GLenum target,
				     GLenum pname,
				     GLfloat *params )
     void glGetHistogramParameteriv( GLenum target,
				     GLenum pname,
				     GLint *params )

PARAMETERS    [Toc]    [Back]

     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    [Toc]    [Back]

     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















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glGetHistogramParameter(3G)    OpenGL Reference	   glGetHistogramParameter(3G)



     ________________________________________________________________________
      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    [Toc]    [Back]

     glGetHistogramParameter is	present	only if	GL_ARB_imaging is returned
     when glGetString is called	with an	argument of GL_EXTENSIONS.

ERRORS    [Toc]    [Back]

     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    [Toc]    [Back]

     glGetHistogram, glHistogram


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