// [config]
// expect_result: pass
// glsl_version: 1.20
//
// # NOTE: Config section was auto-generated from file
// # NOTE: 'glslparser.tests' at git revision
// # NOTE: 6cc17ae70b70d150aa1751f8e28db7b2a9bd50f0
// [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;
}