GLGETCOLORTABLE(3G) 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 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 trans-fer transfer
fer operations are performed, but pixel storage modes that are applicable to glReadPixels are per-formed. performed.
formed.
Color components that are requested in the specified format, but which are not included in the inter-nal internal
nal
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
glGetColorTable is present only if GL_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 glGetColorTable is executed between the execution of glBegin and
the corresponding execution of glEnd.
SEE ALSO
glColorTable(3G), glColorTableParameter(3G), glGetColorTableParameter(3G)
GLGETCOLORTABLE(3G)
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