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Diffstat (limited to 'basicsuite/Qt5Everywhere/demos/shaders/shaders/sobeledgedetection1.fsh')
-rwxr-xr-x | basicsuite/Qt5Everywhere/demos/shaders/shaders/sobeledgedetection1.fsh | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/basicsuite/Qt5Everywhere/demos/shaders/shaders/sobeledgedetection1.fsh b/basicsuite/Qt5Everywhere/demos/shaders/shaders/sobeledgedetection1.fsh new file mode 100755 index 0000000..96732fa --- /dev/null +++ b/basicsuite/Qt5Everywhere/demos/shaders/shaders/sobeledgedetection1.fsh @@ -0,0 +1,83 @@ +/**************************************************************************** +** +** 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; +} |