1991-2006 Silicon Graphics, Inc.
glColorSubTable 3G
glColorSubTable respecify a portion of a color table

## C Specification

void `glColorSubTable` GLenum target GLsizei start GLsizei count GLenum format GLenum type const GLvoid * data

## Parameters

target

  Must be one of `GL_COLOR_TABLE`, `GL_POST_CONVOLUTION_COLOR_TABLE`, or `GL_POST_COLOR_MATRIX_COLOR_TABLE`.

start

  The starting index of the portion of the color table to be replaced.

count

  The number of table entries to replace.

format

  The format of the pixel data in data. The allowable 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 data. The allowable values are `GL_UNSIGNED_BYTE`, `GL_BYTE`, `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`.

data

  Pointer to a one-dimensional array of pixel data that is processed to replace the specified region of the color table.

## Description

`glColorSubTable` is used to respecify a contiguous portion of a color table previously defined using glColorTable. The pixels referenced by data replace the portion of the existing table from indices start to start + count - 1 , inclusive. This region may not include any entries outside the range of the color table as it was originally specified. It is not an error to specify a subtexture with width of 0, but such a specification has no effect.

If a non-zero named buffer object is bound to the `GL_PIXEL_UNPACK_BUFFER` target (see glBindBuffer) while a portion of a color table is respecified, data is treated as a byte offset into the buffer object's data store.

## Notes

`glColorSubTable` 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_VALUE` is generated if start + count > width .

`GL_INVALID_OPERATION` is generated if a non-zero buffer object name is bound to the `GL_PIXEL_UNPACK_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_UNPACK_BUFFER` target and the data would be unpacked from the buffer object such that the memory reads 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_UNPACK_BUFFER` target and data 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 `glColorSubTable` is executed between the execution of glBegin and the corresponding execution of glEnd.

## Associated Gets

glGetColorTable, glGetColorTableParameter

glGet with argument `GL_PIXEL_UNPACK_BUFFER_BINDING`

## See Also

glColorTable, glColorTableParameter, glCopyColorTable, glCopyColorSubTable, glGetColorTable

## 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/.