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/**
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
#ifndef __RAS_SOBEL2DFILTER
#define __RAS_SOBEL2DFILTER
char * SobelFragmentShader=STRINGIFY(
uniform sampler2D bgl_RenderedTexture;
uniform vec2 bgl_TextureCoordinateOffset[9];
void main(void)
{
vec4 sample[9];
for (int i = 0; i < 9; i++)
{
sample[i] = texture2D(bgl_RenderedTexture,
gl_TexCoord[0].st + bgl_TextureCoordinateOffset[i]);
}
vec4 horizEdge = sample[2] + (2.0*sample[5]) + sample[8] -
(sample[0] + (2.0*sample[3]) + sample[6]);
vec4 vertEdge = sample[0] + (2.0*sample[1]) + sample[2] -
(sample[6] + (2.0*sample[7]) + sample[8]);
gl_FragColor.rgb = sqrt((horizEdge.rgb * horizEdge.rgb) +
(vertEdge.rgb * vertEdge.rgb));
gl_FragColor.a = 1.0;
}
);
#endif
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