fglGetColorTable(3G)

NAME
     fglGetColorTable - retrieve contents of a color lookup table


FORTRAN SPECIFICATION
     SUBROUTINE fglGetColorTable( INTEGER*4 target,
                                  INTEGER*4 format,
                                  INTEGER*4 type,
                                  CHARACTER*8 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, 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
     fglGetColorTable 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 fglReadPixels 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
                     alpha                alpha
                     luminance            red
                     intensity            red
                     ________________________________________


NOTES
     fglGetColorTable is present only if GL_ARB_imaging is returned when
     fglGetString is called with an argument of GL_EXTENSIONS.

     GL_ABGR_EXT is valid only if the EXT_abgr extension is supported.

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 not GL_RGBA, GL_BGRA or GL_ABGR_EXT.

     GL_INVALID_OPERATION is generated if fglGetColorTable is executed between
     the execution of fglBegin and the corresponding execution of fglEnd.


SEE ALSO
     fglColorTable, fglColorTableParameter, fglGetColorTableParameter