glGetColorTable(3G)	       OpenGL Reference		   glGetColorTable(3G)

NAME    [Toc]    [Back]

     glGetColorTable - retrieve	contents of a color lookup table

C SPECIFICATION    [Toc]    [Back]

     void glGetColorTable( GLenum target,
			   GLenum format,
			   GLenum type,
			   GLvoid *table )

PARAMETERS    [Toc]    [Back]

     target  Must be GL_COLOR_TABLE, GL_POST_CONVOLUTION_COLOR_TABLE, or
	     GL_POST_COLOR_MATRIX_COLOR_TABLE.

     format  The format	of the pixel data in table.  The possible values are
	     GL_RED, GL_GREEN, GL_BLUE,	GL_ALPHA, GL_LUMINANCE,
	     GL_LUMINANCE_ALPHA, GL_RGB, GL_BGR, GL_RGBA, GL_BGRA, and
	     GL_ABGR_EXT.

     type    The type of the pixel data	in table.  Symbolic constants
	     GL_UNSIGNED_BYTE, GL_BYTE,	GL_BITMAP, GL_UNSIGNED_SHORT,
	     GL_SHORT, GL_UNSIGNED_INT,	GL_INT,	GL_FLOAT,
	     GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV,
	     GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_5_6_5_REV,
	     GL_UNSIGNED_SHORT_4_4_4_4,	GL_UNSIGNED_SHORT_4_4_4_4_REV,
	     GL_UNSIGNED_SHORT_5_5_5_1,	GL_UNSIGNED_SHORT_1_5_5_5_REV,
	     GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV,
	     GL_UNSIGNED_INT_10_10_10_2, and GL_UNSIGNED_INT_2_10_10_10_REV
	     are accepted.

     table   Pointer to	a one-dimensional array	of pixel data containing the
	     contents of the color table.

DESCRIPTION    [Toc]    [Back]

     glGetColorTable returns in	table the contents of the color	table
     specified by target. No pixel transfer operations are performed, but
     pixel storage modes that are applicable to	glReadPixels are performed.

     Color components that are requested in the	specified format, but which
     are not included in the internal format of	the color lookup table,	are
     returned as zero.	The assignments	of internal color components to	the
     components	requested by format are

		     ________________________________________
		     Internal Component	  Resulting Component
		     ________________________________________
		     red		  red
		     green		  green
		     blue		  blue





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glGetColorTable(3G)	       OpenGL Reference		   glGetColorTable(3G)



		     alpha		  alpha
		     luminance		  red
		     intensity		  red
		     ________________________________________

NOTES    [Toc]    [Back]

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

     GL_ABGR_EXT is valid only if the EXT_abgr extension is supported.

ERRORS    [Toc]    [Back]

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

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

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

     GL_INVALID_OPERATION is generated if type is one of
     GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV,
     GL_UNSIGNED_SHORT_5_6_5, or GL_UNSIGNED_SHORT_5_6_5_REV and format	is not
     GL_RGB.

     GL_INVALID_OPERATION is generated if type is one of
     GL_UNSIGNED_SHORT_4_4_4_4,	GL_UNSIGNED_SHORT_4_4_4_4_REV,
     GL_UNSIGNED_SHORT_5_5_5_1,	GL_UNSIGNED_SHORT_1_5_5_5_REV,
     GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV,
     GL_UNSIGNED_INT_10_10_10_2, or GL_UNSIGNED_INT_2_10_10_10_REV and format
     is	not GL_RGBA, GL_BGRA or	GL_ABGR_EXT.

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

SEE ALSO    [Toc]    [Back]

     glColorTable, glColorTableParameter, glGetColorTableParameter


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