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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Nokia Corporation and its Subsidiary(-ies) 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."
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick 2.0
import QtQuick.Particles 2.0
Rectangle{
id: root
color: "white"
width: 310
height: 300
ParticleSystem{ id: sys }
CustomParticle{
system: sys
property real maxWidth: root.width
property real maxHeight: root.height
ShaderEffectSource{
id: pictureSource
sourceItem: picture
hideSource: true
}
Image{
id: picture
source: "content/singlesmile.png"
}
ShaderEffectSource{
id: particleSource
sourceItem: particle
hideSource: true
}
Image{
id: particle
source: "content/particle.png"
}
vertexShader:"
attribute highp vec2 vPos;
attribute highp vec2 vTex;
attribute highp vec4 vData; // x = time, y = lifeSpan, z = size, w = endSize
attribute highp vec4 vVec; // x,y = constant speed, z,w = acceleration
attribute highp float r;
uniform highp float maxWidth;
uniform highp float maxHeight;
uniform highp mat4 qt_Matrix;
uniform highp float timestamp;
uniform lowp float qt_Opacity;
varying highp vec2 fTex;
varying highp vec2 fTex2;
varying lowp float fFade;
void main() {
fTex = vTex;
fTex2 = vec2(vPos.x / maxWidth, vPos.y / maxHeight);
highp float size = vData.z;
highp float endSize = vData.w;
highp float t = (timestamp - vData.x) / vData.y;
highp float currentSize = mix(size, endSize, t * t);
if (t < 0. || t > 1.)
currentSize = 0.;
highp vec2 pos = vPos
- currentSize / 2. + currentSize * vTex // adjust size
+ vVec.xy * t * vData.y // apply speed vector..
+ 0.5 * vVec.zw * pow(t * vData.y, 2.);
gl_Position = qt_Matrix * vec4(pos.x, pos.y, 0, 1);
highp float fadeIn = min(t * 10., 1.);
highp float fadeOut = 1. - max(0., min((t - 0.75) * 4., 1.));
fFade = fadeIn * fadeOut * qt_Opacity;
}
"
property variant particleTexture: particleSource
property variant pictureTexture: pictureSource
fragmentShader: "
uniform sampler2D particleTexture;
uniform sampler2D pictureTexture;
varying highp vec2 fTex;
varying highp vec2 fTex2;
varying highp float fFade;
void main() {
gl_FragColor = texture2D(pictureTexture, fTex2) * texture2D(particleTexture, fTex).w * fFade;
}"
}
Emitter{
id: emitter
system: sys
emitting: false
lifeSpan: 4000
emitCap: 1200
anchors.fill: parent
size: 32
speed: PointDirection{ xVariation: 12; yVariation: 12 }
}
MouseArea{
anchors.fill: parent
onClicked: emitter.burst(1200);
}
}
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