fglGetColorTable(3G) OpenGL Reference 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
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fglGetColorTable(3G) OpenGL Reference fglGetColorTable(3G)
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
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