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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 "Graphics Shaders: Theory and Practice" (http://cgeducation.org/ShadersBook/)
uniform float dividerValue;
uniform float mixLevel;
uniform float resS;
uniform float resT;
uniform sampler2D source;
uniform lowp float qt_Opacity;
varying vec2 qt_TexCoord0;
void main()
{
vec2 uv = qt_TexCoord0.xy;
vec4 c = vec4(0.0);
if (uv.x < dividerValue) {
vec2 st = qt_TexCoord0.st;
vec3 irgb = texture2D(source, st).rgb;
vec2 stp0 = vec2(1.0 / resS, 0.0);
vec2 st0p = vec2(0.0 , 1.0 / resT);
vec2 stpp = vec2(1.0 / resS, 1.0 / resT);
vec2 stpm = vec2(1.0 / resS, -1.0 / resT);
const vec3 W = vec3(0.2125, 0.7154, 0.0721);
float i00 = dot(texture2D(source, st).rgb, W);
float im1m1 = dot(texture2D(source, st-stpp).rgb, W);
float ip1p1 = dot(texture2D(source, st+stpp).rgb, W);
float im1p1 = dot(texture2D(source, st-stpm).rgb, W);
float ip1m1 = dot(texture2D(source, st+stpm).rgb, W);
float im10 = dot(texture2D(source, st-stp0).rgb, W);
float ip10 = dot(texture2D(source, st+stp0).rgb, W);
float i0m1 = dot(texture2D(source, st-st0p).rgb, W);
float i0p1 = dot(texture2D(source, st+st0p).rgb, W);
float h = -1.0*im1p1 - 2.0*i0p1 - 1.0*ip1p1 + 1.0*im1m1 + 2.0*i0m1 + 1.0*ip1m1;
float v = -1.0*im1m1 - 2.0*im10 - 1.0*im1p1 + 1.0*ip1m1 + 2.0*ip10 + 1.0*ip1p1;
float mag = 1.0 - length(vec2(h, v));
vec3 target = vec3(mag, mag, mag);
c = vec4(target, 1.0);
} else {
c = texture2D(source, qt_TexCoord0);
}
gl_FragColor = qt_Opacity * c;
}
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