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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/
//! [0]
static char const colorizeShaderCode[] =
"uniform lowp vec4 effectColor;\n"
"lowp vec4 customShader(lowp sampler2D imageTexture, highp vec2 textureCoords) {\n"
" vec4 src = texture2D(imageTexture, textureCoords);\n"
" float gray = dot(src.rgb, vec3(0.212671, 0.715160, 0.072169));\n"
" vec4 colorize = 1.0-((1.0-gray)*(1.0-effectColor));\n"
" return vec4(colorize.rgb, src.a);\n"
"}";
//! [0]
//! [1]
class ColorizeEffect : public QGraphicsShaderEffect
{
Q_OBJECT
public:
ColorizeEffect(QObject *parent = 0)
: QGraphicsShaderEffect(parent), color(Qt::black)
{
setPixelShaderFragment(colorizeShaderCode);
}
QColor effectColor() const { return color; }
void setEffectColor(const QColor& c)
{
color = c;
setUniformsDirty();
}
protected:
void setUniforms(QGLShaderProgram *program)
{
program->setUniformValue("effectColor", color);
}
private:
QColor color;
};
//! [1]
//! [2]
lowp vec4 customShader(lowp sampler2D imageTexture, highp vec2 textureCoords) {
return texture2D(imageTexture, textureCoords);
}
//! [2]
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