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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd and/or its subsidiary(-ies).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
// 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);
}
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