399500f87e
Change-Id: Ia8c1c38aba1544603fada8c414cc856f365fd15b Reviewed-by: Akseli Salovaara <akseli.salovaara@digia.com> Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
78 lines
3.0 KiB
GLSL
78 lines
3.0 KiB
GLSL
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the Qt Mobility Components.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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// Based on http://rastergrid.com/blog/downloads/frei-chen-edge-detector/
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#version 130
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uniform sampler2D source;
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uniform float dividerValue;
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uniform float weight;
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mat3 G[2] = mat3[](
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mat3( 1.0, 2.0, 1.0, 0.0, 0.0, 0.0, -1.0, -2.0, -1.0 ),
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mat3( 1.0, 0.0, -1.0, 2.0, 0.0, -2.0, 1.0, 0.0, -1.0 )
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);
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uniform lowp float qt_Opacity;
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in vec2 qt_TexCoord0;
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out vec4 FragmentColor;
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void main() {
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vec2 uv = qt_TexCoord0.xy;
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vec4 c = vec4(0.0);
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if (uv.x < dividerValue) {
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mat3 intensity;
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float conv[2];
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vec3 sample;
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for (int i=0; i<3; ++i) {
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for (int j=0; j<3; ++j) {
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sample = texelFetch(source, ivec2(gl_FragCoord) + ivec2(i-1, j-1), 0).rgb;
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intensity[i][j] = length(sample) * weight;
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}
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}
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for (int i=0; i<2; ++i) {
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float dp3 = dot(G[i][0], intensity[0]) + dot(G[i][1], intensity[1]) + dot(G[i][2], intensity[2]);
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conv[i] = dp3 * dp3;
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}
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c = vec4(0.5 * sqrt(conv[0]*conv[0] + conv[1]*conv[1]));
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} else {
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c = texture2D(source, qt_TexCoord0);
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}
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FragmentColor = qt_Opacity * c;
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}
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