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/usr/lib/libreoffice/program/opengl/dissolveFragmentShader.glsl is in libreoffice-ogltrans 1:5.1.2-0ubuntu1.

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2008 by Sun Microsystems, Inc.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org 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 Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

#version 120

uniform sampler2D leavingSlideTexture;
uniform sampler2D enteringSlideTexture;
uniform sampler2D permTexture;
uniform float time;
varying vec2 v_texturePosition;

float snoise(vec2 P) {

  return texture2D(permTexture, P).r;
}

void main() {
     float sn = snoise(10.0*v_texturePosition);
     if( sn < time)
         gl_FragColor = texture2D(enteringSlideTexture, v_texturePosition);
     else
         gl_FragColor = texture2D(leavingSlideTexture, v_texturePosition);
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */