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GLGETCOLORTABLE(3G)			  OpenGL Manual 		      GLGETCOLORTABLE(3G)

NAME
       glGetColorTable - retrieve contents of a color lookup table

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

PARAMETERS
       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, and
	   GL_BGRA.

       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
       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.

       If a non-zero named buffer object is bound to the GL_PIXEL_PACK_BUFFER target (see
       glBindBuffer()) while a histogram table is requested, table is treated as a byte offset
       into the buffer object's data store.

       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 |			   Resulting |
       |Component			 | Component			     |
       |				 |				     |
       +---------------------------------+-----------------------------------+
       |Red				 | Red				     |
       +---------------------------------+-----------------------------------+
       |Green				 | Green			     |
       +---------------------------------+-----------------------------------+
       |Blue				 | Blue 			     |
       +---------------------------------+-----------------------------------+
       |Alpha				 | Alpha			     |
       +---------------------------------+-----------------------------------+
       |Luminance			 | Red				     |
       +---------------------------------+-----------------------------------+
       |Intensity			 | Red				     |
       +---------------------------------+-----------------------------------+

NOTES
       glGetColorTable is present only if 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 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 neither GL_RGBA nor GL_BGRA.

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the
       GL_PIXEL_PACK_BUFFER target and the buffer object's data store is currently mapped.

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the
       GL_PIXEL_PACK_BUFFER target and the data would be packed to the buffer object such that
       the memory writes required would exceed the data store size.

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the
       GL_PIXEL_PACK_BUFFER target and table is not evenly divisible into the number of bytes
       needed to store in memory a datum indicated by type.

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

ASSOCIATED GETS
       glGetColorTableParameter()

       glGet() with argument GL_PIXEL_PACK_BUFFER_BINDING

SEE ALSO
       glColorTable(), glColorTableParameter()

COPYRIGHT
       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI
       Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org				    06/10/2014			      GLGETCOLORTABLE(3G)
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