diff options
Diffstat (limited to 'examples/multimedia/video/qmlvideofx/shaders/magnify.fsh')
-rw-r--r-- | examples/multimedia/video/qmlvideofx/shaders/magnify.fsh | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/examples/multimedia/video/qmlvideofx/shaders/magnify.fsh b/examples/multimedia/video/qmlvideofx/shaders/magnify.fsh new file mode 100644 index 000000000..638254934 --- /dev/null +++ b/examples/multimedia/video/qmlvideofx/shaders/magnify.fsh @@ -0,0 +1,68 @@ +/**************************************************************************** +** +** 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://www.reddit.com/r/programming/comments/losip/shader_toy/c2upn1e + +uniform sampler2D source; +uniform lowp float qt_Opacity; +varying vec2 qt_TexCoord0; +uniform float radius; +uniform float diffractionIndex; +uniform float targetWidth; +uniform float targetHeight; +uniform float posX; +uniform float posY; + +void main() +{ + vec2 tc = qt_TexCoord0; + vec2 center = vec2(posX, posY); + vec2 xy = gl_FragCoord.xy - center.xy; + float r = sqrt(xy.x * xy.x + xy.y * xy.y); + if (r < radius) { + float h = diffractionIndex * 0.5 * radius; + vec2 new_xy = r < radius ? xy * (radius - h) / sqrt(radius * radius - r * r) : xy; + vec2 targetSize = vec2(targetWidth, targetHeight); + tc = (new_xy + center) / targetSize; + tc.y = 1.0 - tc.y; + } + gl_FragColor = qt_Opacity * texture2D(source, tc); +} |