glGetColorTableParameter(3G)   OpenGL Reference	  glGetColorTableParameter(3G)

NAME    [Toc]    [Back]

     glGetColorTableParameterfv, glGetColorTableParameteriv - get color	lookup
     table parameters

C SPECIFICATION    [Toc]    [Back]

     void glGetColorTableParameterfv( GLenum target,
				      GLenum pname,
				      GLfloat *params )
     void glGetColorTableParameteriv( GLenum target,
				      GLenum pname,
				      GLint *params )

PARAMETERS    [Toc]    [Back]

     target  The target	color table.  Must be GL_COLOR_TABLE,
	     GL_POST_CONVOLUTION_COLOR_TABLE,
	     GL_POST_COLOR_MATRIX_COLOR_TABLE, GL_PROXY_COLOR_TABLE,
	     GL_PROXY_POST_CONVOLUTION_COLOR_TABLE,
	     GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE.

     pname   The symbolic name of a color lookup table parameter.  Must	be one
	     of	GL_COLOR_TABLE_BIAS, GL_COLOR_TABLE_SCALE,
	     GL_COLOR_TABLE_FORMAT, GL_COLOR_TABLE_WIDTH,
	     GL_COLOR_TABLE_RED_SIZE, GL_COLOR_TABLE_GREEN_SIZE,
	     GL_COLOR_TABLE_BLUE_SIZE, GL_COLOR_TABLE_ALPHA_SIZE,
	     GL_COLOR_TABLE_LUMINANCE_SIZE, or GL_COLOR_TABLE_INTENSITY_SIZE.

     params  A pointer to an array where the values of the parameter will be
	     stored.

DESCRIPTION    [Toc]    [Back]

     Returns parameters	specific to color table	target.

     When pname	is set to GL_COLOR_TABLE_SCALE or GL_COLOR_TABLE_BIAS,
     glGetColorTableParameter returns the color	table scale or bias parameters
     for the table specified by	target.	 For these queries, target must	be set
     to	GL_COLOR_TABLE,	GL_POST_CONVOLUTION_COLOR_TABLE, or
     GL_POST_COLOR_MATRIX_COLOR_TABLE and params points	to an array of four
     elements, which receive the scale or bias factors for red,	green, blue,
     and alpha,	in that	order.

     glGetColorTableParameter can also be used to retrieve the format and size
     parameters	for a color table. For these queries, set target to either the
     color table target	or the proxy color table target.  The format and size
     parameters	are set	by glColorTable.

     The following table lists the format and size parameters that may be
     queried.  For each	symbolic constant listed below for pname, params must
     point to an array of the given length, and	receive	the values indicated.





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glGetColorTableParameter(3G)   OpenGL Reference	  glGetColorTableParameter(3G)



       ___________________________________________________________________
	Parameter			N   Meaning
	__________________________________________________________________
	GL_COLOR_TABLE_FORMAT		1   Internal format (e.g. GL_RGBA)
	GL_COLOR_TABLE_WIDTH		1   Number of elements in table
	GL_COLOR_TABLE_RED_SIZE		1   Size of red	component, in bits
	GL_COLOR_TABLE_GREEN_SIZE	1   Size of green component
	GL_COLOR_TABLE_BLUE_SIZE	1   Size of blue component
	GL_COLOR_TABLE_ALPHA_SIZE	1   Size of alpha component
	GL_COLOR_TABLE_LUMINANCE_SIZE	1   Size of luminance component
	GL_COLOR_TABLE_INTENSITY_SIZE	1   Size of intensity component
	__________________________________________________________________

NOTES    [Toc]    [Back]

     glGetColorTableParameter 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 or pname is	not an acceptable
     value.

     GL_INVALID_OPERATION is generated if glGetColorTableParameter is executed
     between the execution of glBegin and the corresponding execution of
     glEnd.


MACHINE	DEPENDENCIES
     The SGI_color_table extension is not supported on RealityEngine,
     RealityEngine2, and VTX systems.

SEE ALSO    [Toc]    [Back]

     glColorTable, glTexParameter, glColorTableParameter


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