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fglConvolutionFilter1D(3G)     OpenGL Reference	    fglConvolutionFilter1D(3G)

NAME
     fglConvolutionFilter1D - define a one-dimensional convolution filter

FORTRAN SPECIFICATION
     SUBROUTINE fglConvolutionFilter1D( INTEGER*4 target,
					INTEGER*4 internalformat,
					INTEGER*4 width,
					INTEGER*4 format,
					INTEGER*4 type,
					CHARACTER*8 image )

PARAMETERS
     target	     Must be GL_CONVOLUTION_1D.

     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 width of the pixel array referenced by image.

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

     type	     The type of the pixel data in 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 a one-dimensional array of pixel data that is
		     processed to build the convolution filter kernel.

									Page 1

fglConvolutionFilter1D(3G)     OpenGL Reference	    fglConvolutionFilter1D(3G)

DESCRIPTION
     fglConvolutionFilter1D builds a one-dimensional convolution filter kernel
     from an array of pixels.

     The pixel array specified by width, format, type, and image is extracted
     from memory and processed just as if fglDrawPixels were called, but
     processing stops after the final expansion to RGBA is completed.

     The R, G, B, and A components of each pixel are next scaled by the four
     1D GL_CONVOLUTION_FILTER_SCALE parameters and biased by the four 1D
     GL_CONVOLUTION_FILTER_BIAS parameters.  (The scale and bias parameters
     are set by fglConvolutionParameter using the GL_CONVOLUTION_1D 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:

      _______________________________________________________________________
      Internal Format	   Red	 Green	 Blue	Alpha	Luminance   Intensity
      _______________________________________________________________________
      GL_ALPHA					  A
      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 a one-dimensional filter kernel image indexed with
     coordinate i such that i starts at 0 and increases from left to right.
     Kernel location i is derived from the ith pixel, counting from 0.

     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
     fglConvolutionFilter1D is present only if GL_ARB_imaging is returned when
     fglGetString is called with an argument of GL_EXTENSIONS.

									Page 2

fglConvolutionFilter1D(3G)     OpenGL Reference	    fglConvolutionFilter1D(3G)

     GL_ABGR_EXT is valid only if the EXT_abgr extension is supported.

ERRORS
     GL_INVALID_ENUM is generated if target is not GL_CONVOLUTION_1D.

     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_CONVOLUTION_1D and name
     GL_MAX_CONVOLUTION_WIDTH.

     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 fglConvolutionFilter1D is executed
     between the execution of fglBegin and the corresponding execution of
     fglEnd.

     GL_INVALID_OPERATION is generated if format 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 type is not
     GL_RGB.

     GL_INVALID_OPERATION is generated if format 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 type is
     not GL_RGBA, GL_BGRA or GL_ABGR_EXT.

ASSOCIATED GETS
     fglGetConvolutionParameter, fglGetConvolutionFilter

SEE ALSO
     fglConvolutionFilter2D, fglSeparableFilter2D, fglConvolutionParameter,
     fglPixelTransfer

									Page 3

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