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 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
     ________________________________________________________________________
      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
     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