GLGETCOLORTABLE - Online Linux Manual PageSection : 3G

NAME"glGetColorTable − retrieve contents of a color lookup table

C SPECIFICATIONvoid glGetColorTable( GLenum target, GLenum format, GLenum type, GLvoid *table )

PARAMETERStarget  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.

DESCRIPTION­glGetColorTable 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. Color components that are requested in the specified format, but which are not included in the internal
 of the color lookup table, are returned as zero. The assignments of internal color components to the components requested by
format are
Internal ComponentResulting Component redred greengreen blueblue alphaalpha luminancered intensityred

NOTES­glGetColorTable is present only if ­GL_ARB_imaging is returned when ­glGetString is called with an argument of ­GL_EXTENSIONS.

ERRORS­GL_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 ALSO­glColorTable(3G), ­glColorTableParameter(3G), ­glGetColorTableParameter(3G)
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