Signature
Parameters
Variables | Description |
---|---|
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
, 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 transfer operations are performed, but pixel
storage modes that are applicable to
glReadPixels
are performed.
If a non-zero named buffer object is bound to the
GL_PIXEL_PACK_BUFFER
target
(see
glBindBuffer
) while a histogram table is
requested,
table
is treated as a byte offset into the buffer object's data store.
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
glGetColorTable
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_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 a non-zero buffer object name is bound to the
GL_PIXEL_PACK_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_PACK_BUFFER
target and the data would be packed to the buffer
object such that the memory writes 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_PACK_BUFFER
target and
table
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
glGetColorTable
is executed
between the execution of
glBegin
and the corresponding
execution of
glEnd
.
Associated Gets
glGet
with argument
GL_PIXEL_PACK_BUFFER_BINDING
See Also
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/
.