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fglSeparableFilter2D(3G)       OpenGL Reference	      fglSeparableFilter2D(3G)

NAME
     fglSeparableFilter2D - define a separable two-dimensional convolution
     filter

FORTRAN SPECIFICATION
     SUBROUTINE fglSeparableFilter2D( INTEGER*4 target,
				      INTEGER*4 internalformat,
				      INTEGER*4 width,
				      INTEGER*4 height,
				      INTEGER*4 format,
				      INTEGER*4 type,
				      CHARACTER*8 row,
				      CHARACTER*8 column )

PARAMETERS
     target	     Must be GL_SEPARABLE_2D.

     internalformat  The internal format of the convolution filter kernel.
		     The allowable values are GL_ALPHA, GL_ALPHA4, GL_ALPHA8,
		     GL_ALPHA12, GL_ALPHA16, GL_LUMINANCE, GL_LUMINANCE4,
		     GL_LUMINANCE8, GL_LUMINANCE12, GL_LUMINANCE16,
		     GL_LUMINANCE_ALPHA, GL_LUMINANCE4_ALPHA4,
		     GL_LUMINANCE6_ALPHA2, GL_LUMINANCE8_ALPHA8,
		     GL_LUMINANCE12_ALPHA4, GL_LUMINANCE12_ALPHA12,
		     GL_LUMINANCE16_ALPHA16, GL_INTENSITY, GL_INTENSITY4,
		     GL_INTENSITY8, GL_INTENSITY12, GL_INTENSITY16,
		     GL_R3_G3_B2, GL_RGB, GL_RGB4, GL_RGB5, GL_RGB8, GL_RGB10,
		     GL_RGB12, GL_RGB16, GL_RGBA, GL_RGBA2, GL_RGBA4,
		     GL_RGB5_A1, GL_RGBA8, GL_RGB10_A2, GL_RGBA12, or
		     GL_RGBA16.

     width	     The number of elements in the pixel array referenced by
		     row.  (This is the width of the separable filter kernel.)

     height	     The number of elements in the pixel array referenced by
		     column.  (This is the height of the separable filter
		     kernel.)

     format	     The format of the pixel data in row and column.  The
		     allowable values are GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA,
		     GL_RGB, GL_BGR, GL_RGBA, GL_BGRA, GL_ABGR_EXT,
		     GL_INTENSITY, GL_LUMINANCE, and GL_LUMINANCE_ALPHA.

     type	     The type of the pixel data in row and column.  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,

									Page 1

fglSeparableFilter2D(3G)       OpenGL Reference	      fglSeparableFilter2D(3G)

		     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 a one-dimensional array of pixel data that is
		     processed to build the row filter kernel.

     column	     Pointer to a one-dimensional array of pixel data that is
		     processed to build the column filter kernel.

DESCRIPTION
     fglSeparableFilter2D builds a two-dimensional separable convolution
     filter kernel from two arrays of pixels.

     The pixel arrays specified by (width, format, type, row) and (height,
     format, type, column) are processed just as if they had been passed to
     fglDrawPixels, but processing stops after the final expansion to RGBA is
     completed.

     Next, the R, G, B, and A components of all pixels in both arrays are
     scaled by the four separable 2D GL_CONVOLUTION_FILTER_SCALE parameters
     and biased by the four separable 2D GL_CONVOLUTION_FILTER_BIAS
     parameters.  (The scale and bias parameters are set by
     fglConvolutionParameter using the GL_SEPARABLE_2D target and the names
     GL_CONVOLUTION_FILTER_SCALE and GL_CONVOLUTION_FILTER_BIAS.  The
     parameters themselves are vectors of four values that are applied to red,
     green, blue, and alpha, in that order.)  The R, G, B, and A values are
     not clamped to [0,1] at any time during this process.

     Each pixel is then converted to the internal format specified by
     internalformat.  This conversion simply maps the component values of the
     pixel (R, G, B, and A) to the values included in the internal format
     (red, green, blue, alpha, luminance, and intensity).  The mapping is as
     follows:

									Page 2

fglSeparableFilter2D(3G)       OpenGL Reference	      fglSeparableFilter2D(3G)

     ________________________________________________________________________
      Internal Format	   Red	 Green	 Blue	Alpha	Luminance   Intensity
      _______________________________________________________________________
      GL_LUMINANCE					    R
      GL_LUMINANCE_ALPHA			  A	    R
      GL_INTENSITY							R
      GL_RGB		    R	   G	  B
      GL_RGBA		    R	   G	  B	  A
      _______________________________________________________________________

     The red, green, blue, alpha, luminance, and/or intensity components of
     the resulting pixels are stored in floating-point rather than integer
     format.  They form two one-dimensional filter kernel images.  The row
     image is indexed by coordinate i starting at zero and increasing from
     left to right.  Each location in the row image is derived from element i
     of row.  The column image is indexed by coordinate j starting at zero and
     increasing from bottom to top.  Each location in the column image is
     derived from element j of column.

     Note that after a convolution is performed, the resulting color
     components are also scaled by their corresponding
     GL_POST_CONVOLUTION_c_SCALE parameters and biased by their corresponding
     GL_POST_CONVOLUTION_c_BIAS parameters (where c takes on the values RED,
     GREEN, BLUE, and ALPHA).  These parameters are set by fglPixelTransfer.

NOTES
     fglSeparableFilter2D is present only if GL_ARB_imaging is returned when
     fglGetString is called with an argument of GL_EXTENSIONS.

     GL_ABGR_EXT is valid only if the EXT_abgr extension is supported.

ERRORS
     GL_INVALID_ENUM is generated if target is not GL_SEPARABLE_2D.

     GL_INVALID_ENUM is generated if internalformat is not one of the
     allowable values.

     GL_INVALID_VALUE is generated if width is less than zero or greater than
     the maximum supported value.  This value may be queried with
     fglGetConvolutionParameter using target GL_SEPARABLE_2D and name
     GL_MAX_CONVOLUTION_WIDTH.

     GL_INVALID_VALUE is generated if height is less than zero or greater than
     the maximum supported value.  This value may be queried with
     fglGetConvolutionParameter using target GL_SEPARABLE_2D and name
     GL_MAX_CONVOLUTION_HEIGHT.

     GL_INVALID_ENUM is generated if format is not one of the allowable
     values.

									Page 3

fglSeparableFilter2D(3G)       OpenGL Reference	      fglSeparableFilter2D(3G)

     GL_INVALID_ENUM is generated if type is not one of the allowable values.

     GL_INVALID_OPERATION is generated if fglSeparableFilter2D is executed
     between the execution of fglBegin and the corresponding execution of
     fglEnd.

     GL_INVALID_OPERATION is generated if height 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 height 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 not GL_RGBA, GL_BGRA or GL_ABGR_EXT.

ASSOCIATED GETS
     fglGetConvolutionParameter, fglGetSeparableFilter

SEE ALSO
     fglConvolutionFilter1D, fglConvolutionFilter2D, fglConvolutionParameter,
     fglPixelTransfer

									Page 4

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