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// [config]
// expect_result: pass
// glsl_version: 1.20
//
// [end config]
/*
* GStreamer
* Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#extension GL_ARB_texture_rectangle : enable
uniform sampler2DRect tex;
uniform float norm_const;
uniform float norm_offset;
uniform float kernel[9];
void main () {
/* float offset[9] = float[9] (-4.0, -3.0, -2.0, -1.0, 0.0, 1.0, 2.0, 3.0, 4.0); */
/* don't use array constructor so we don't have to depend on #version 120 */
float offset[9];
offset[0] = -4.0;
offset[1] = -3.0;
offset[2] = -2.0;
offset[3] = -1.0;
offset[4] = 0.0;
offset[5] = 1.0;
offset[6] = 2.0;
offset[7] = 3.0;
offset[8] = 4.0;
vec2 texturecoord = gl_TexCoord[0].st;
int i;
vec4 sum = vec4 (0.0);
for (i = 0; i < 9; i++) {
if (kernel[i] != 0.0) {
vec4 neighbor = texture2DRect(tex, vec2(texturecoord.s+offset[i], texturecoord.t));
sum += neighbor * kernel[i]/norm_const;
}
}
gl_FragColor = sum + norm_offset;
}
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