glGetConvolutionFilter man page on Oracle
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GLGETCONVOLUTIONFILT(3G) OpenGL Manual GLGETCONVOLUTIONFILT(3G)
NAME
glGetConvolutionFilter - get current 1D or 2D convolution filter kernel
C SPECIFICATION
void glGetConvolutionFilter(GLenum target, GLenum format, GLenum type,
GLvoid * image);
PARAMETERS
target
The filter to be retrieved. Must be one of GL_CONVOLUTION_1D or
GL_CONVOLUTION_2D.
format
Format of the output image. 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 image. 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.
image
Pointer to storage for the output image.
DESCRIPTION
glGetConvolutionFilter returns the current 1D or 2D convolution filter
kernel as an image. The one- or two-dimensional image is placed in
image according to the specifications in format and type. No pixel
transfer operations are performed on this image, 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 convolution filter is requested,
image is 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 filter 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
glGetConvolutionFilter is present only if ARB_imaging is returned when
glGetString() is called with an argument of GL_EXTENSIONS.
The current separable 2D filter must be retrieved with
glGetSeparableFilter() rather than glGetConvolutionFilter.
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 image 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 glGetConvolutionFilter 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
glGetSeparableFilter(), glConvolutionParameter(),
glConvolutionFilter1D(), glConvolutionFilter2D()
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 04/29/2014 GLGETCONVOLUTIONFILT(3G)
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