glGetSeparableFilter man page on RedHat
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GLGETSEPARABLEFILTER(3G) OpenGL Manual GLGETSEPARABLEFILTER(3G)
NAME
glGetSeparableFilter - get separable convolution filter kernel images
C SPECIFICATION
void glGetSeparableFilter(GLenum target, GLenum format, GLenum type,
GLvoid * row, GLvoid * column,
GLvoid * span);
PARAMETERS
target
The separable filter to be retrieved. Must be GL_SEPARABLE_2D.
format
Format of the output images. Must be one of GL_RED, GL_GREEN,
GL_BLUE, GL_ALPHA, GL_RGB, GL_BGR GL_RGBA, GL_BGRA, GL_LUMINANCE,
or GL_LUMINANCE_ALPHA.
type
Data type of components in the output images. 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.
row
Pointer to storage for the row filter image.
column
Pointer to storage for the column filter image.
span
Pointer to storage for the span filter image (currently unused).
DESCRIPTION
glGetSeparableFilter returns the two one-dimensional filter kernel
images for the current separable 2D convolution filter. The row image
is placed in row and the column image is placed in column according to
the specifications in format and type. (In the current implementation,
span is not affected in any way.) No pixel transfer operations are
performed on the images, but the relevant pixel storage modes are
applied.
If a non-zero named buffer object is bound to the GL_PIXEL_PACK_BUFFER
target (see glBindBuffer()) while a separable convolution filter is
requested, row, column, and span are treated as a byte offset into the
buffer object's data store.
Color components that are present in format but not included in the
internal format of the filters are returned as zero. The assignments of
internal color components to the components of format are as follows:
┌─────────────────────────────────┬───────────────────────────────────┐
│ │ │
│ Internal │ Resulting │
│Component │ Component │
│ │ │
├─────────────────────────────────┼───────────────────────────────────┤
│Red │ Red │
├─────────────────────────────────┼───────────────────────────────────┤
│Green │ Green │
├─────────────────────────────────┼───────────────────────────────────┤
│Blue │ Blue │
├─────────────────────────────────┼───────────────────────────────────┤
│Alpha │ Alpha │
├─────────────────────────────────┼───────────────────────────────────┤
│Luminance │ Red │
├─────────────────────────────────┼───────────────────────────────────┤
│Intensity │ Red │
└─────────────────────────────────┴───────────────────────────────────┘
NOTES
glGetSeparableFilter is present only if ARB_imaging is returned when
glGetString() is called with an argument of GL_EXTENSIONS.
Non-separable 2D filters must be retrieved with
glGetConvolutionFilter().
ERRORS
GL_INVALID_ENUM is generated if target is not GL_SEPARABLE_2D.
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 row or column 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 glGetSeparableFilter is executed
between the execution of glBegin() and the corresponding execution of
glEnd().
ASSOCIATED GETS
glGetConvolutionParameter()
glGet() with argument GL_PIXEL_PACK_BUFFER_BINDING
SEE ALSO
glGetConvolutionFilter(), glConvolutionParameter(),
glSeparableFilter2D()
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/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLGETSEPARABLEFILTER(3G)
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