glGetSeparableFilter man page on OpenBSD

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GLGETSEPARABLEFILTER(3G)			      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.

       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
       -----------------------------------------


NOTES
       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.

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 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,
       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.

ASSOCIATED GETS
       glGetConvolutionParameter

SEE ALSO
       glGetConvolutionFilter(3G), glConvolutionParameter(3G),
       glSeparableFilter2D(3G)

								 March 1, 2011
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