// [config]
// expect_result: pass
// glsl_version: 1.10
//
// # 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 width, height;
void main () {
  vec2 tex_size = vec2 (width, height);
  vec2 texturecoord = gl_TexCoord[0].xy;
  vec2 normcoord;
    /* little trick with normalized coords to obtain a circle */
  normcoord = texturecoord / tex_size.x - tex_size / tex_size.x;
  float r = length(normcoord);
  float phi = atan(normcoord.y, normcoord.x);
  r = clamp (r, 0.0, 0.5);    /* is there a way to do this without polars? */
  normcoord.x = r * cos(phi);
  normcoord.y = r * sin(phi);
  texturecoord = (normcoord + tex_size/tex_size.x) * tex_size.x;
  vec4 color = texture2DRect (tex, texturecoord);
  gl_FragColor = color;
}