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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 con‐
	       stants 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 val‐
       ues.

       GL_INVALID_ENUM	is  generated if type is not one of the allowable val‐
       ues.

       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 for‐
       mat is neither GL_RGBA nor GL_BGRA.

ASSOCIATED GETS
       glGetConvolutionParameter

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

						      GLGETSEPARABLEFILTER(3G)
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