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-/****************************************************************************
-**
-** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
-** Contact: http://www.qt-project.org/legal
-**
-** This file is part of the Qt Mobility Components.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and Digia. For licensing terms and
-** conditions see http://qt.digia.com/licensing. For further information
-** use the contact form at http://qt.digia.com/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 2.1 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 2.1 requirements
-** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Digia gives you certain additional
-** rights. These rights are described in the Digia Qt LGPL Exception
-** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-// Based on http://kodemongki.blogspot.com/2011/06/kameraku-custom-shader-effects-example.html
-
-uniform float targetHue;
-uniform float windowWidth;
-uniform float dividerValue;
-
-uniform sampler2D source;
-uniform lowp float qt_Opacity;
-varying vec2 qt_TexCoord0;
-
-void rgb2hsl(vec3 rgb, out float h, out float s, float l)
-{
- float maxval = max(rgb.r, max(rgb.g, rgb.b));
- float minval = min(rgb.r, min(rgb.g, rgb.b));
- float delta = maxval - minval;
- l = (minval + maxval) / 2.0;
- s = 0.0;
- if (l > 0.0 && l < 1.0)
- s = delta / (l < 0.5 ? 2.0 * l : 2.0 - 2.0 * l);
- h = 0.0;
- if (delta > 0.0)
- {
- if (rgb.r == maxval && rgb.g != maxval)
- h += (rgb.g - rgb.b ) / delta;
- if (rgb.g == maxval && rgb.b != maxval)
- h += 2.0 + (rgb.b - rgb.r) / delta;
- if (rgb.b == maxval && rgb.r != maxval)
- h += 4.0 + (rgb.r - rgb.g) / delta;
- h *= 60.0;
- }
-}
-
-void main()
-{
- vec2 uv = qt_TexCoord0.xy;
- vec3 col = texture2D(source, uv).rgb;
- float h, s, l;
- rgb2hsl(col, h, s, l);
- float h2 = (h > targetHue) ? h - 360.0 : h + 360.0;
- float y = 0.3 * col.r + 0.59 * col.g + 0.11 * col.b;
- vec3 result;
- if (uv.x > dividerValue || (abs(h - targetHue) < windowWidth) || (abs(h2 - targetHue) < windowWidth))
- result = col;
- else
- result = vec3(y, y, y);
- gl_FragColor = qt_Opacity * vec4(result, 1.0);
-}