GLGETSEPARABLEFILTER(UNIX Programmer's MaGLGETSEPARABLEFILTER(3G)
glGetSeparableFilter - get separable convolution filter ker-
nel images
void glGetSeparableFilter( GLenum target,
GLenum format,
GLenum type,
GLvoid *row,
GLvoid *column,
GLvoid *span )
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. Sym-
bolic 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).
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 for-
mat and type. (In the current implementation, span is not
affected in any way.) No pixel transfer operations are
MirOS BSD #10-current Printed 20.2.2012 1
GLGETSEPARABLEFILTER(UNIX Programmer's MaGLGETSEPARABLEFILTER(3G)
performed on the images, but the relevant pixel storage
modes are applied.
Color components that are present in format but not included
in the internal of the filters are returned as zero. The
assignments of internal color components to the components
of format are as follows:
________________________________________
Internal Component Resulting Component
________________________________________
Red Red
Green Green
Blue Blue
Alpha Alpha
Luminance Red
Intensity Red
________________________________________
glGetSeparableFilter is present only if GL_ARB_imaging is
returned when glGetString is called with an argument of
GL_EXTENSIONS.
Non-separable 2D filters must be retrieved with
glGetConvolutionFilter.
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 glGetSeparableFilter is
executed between the execution of glBegin and the
corresponding execution of glEnd.
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,
MirOS BSD #10-current Printed 20.2.2012 2
GLGETSEPARABLEFILTER(UNIX Programmer's MaGLGETSEPARABLEFILTER(3G)
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.
glGetConvolutionParameter
glGetConvolutionFilter(3G), glConvolutionParameter(3G),
glSeparableFilter2D(3G)
MirOS BSD #10-current Printed 20.2.2012 3
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