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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 © 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			  03/16/2013		   GLGETCOLORTABLE(3G)

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