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<h1 class="title">fragmentshader.qml Example File</h1>
<span class="subtitle">particles/customparticle/content/fragmentshader.qml</span>
<!-- $$$particles/customparticle/content/fragmentshader.qml-description -->
<div class="descr"> <a name="details"></a>
<pre class="qml">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
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** accordance with the commercial license agreement provided with the
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** 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.
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** 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
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import QtQuick 2.0
import QtQuick.Particles 2.0
<span class="type"><a href="qml-qtquick-particles-particlesystem.html">ParticleSystem</a></span> {
<span class="name">id</span>: <span class="name">root</span>
<span class="name">width</span>: <span class="number">320</span>
<span class="name">height</span>: <span class="number">480</span>
<span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
<span class="name">z</span>: -<span class="number">1</span>
<span class="name">anchors</span>.fill: <span class="name">parent</span>
<span class="name">color</span>: <span class="string">"black"</span>
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> {
<span class="name">anchors</span>.bottom: <span class="name">parent</span>.<span class="name">bottom</span>
<span class="name">anchors</span>.horizontalCenter: <span class="name">parent</span>.<span class="name">horizontalCenter</span>
<span class="name">font</span>.pixelSize: <span class="number">14</span>
<span class="name">color</span>: <span class="string">"white"</span>
<span class="name">text</span>: <span class="string">"It's all in the fragment shader."</span>
}
}
<span class="type"><a href="qml-qtquick-particles-emitter.html">Emitter</a></span> {
<span class="name">emitRate</span>: <span class="number">400</span>
<span class="name">lifeSpan</span>: <span class="number">8000</span>
<span class="name">size</span>: <span class="number">24</span>
<span class="name">sizeVariation</span>: <span class="number">16</span>
<span class="name">velocity</span>: <span class="name">PointDirection</span> {<span class="name">x</span>: <span class="name">root</span>.<span class="name">width</span><span class="operator">/</span><span class="number">10</span>; <span class="name">y</span>: <span class="name">root</span>.<span class="name">height</span><span class="operator">/</span><span class="number">10</span>;}
<span class="name">acceleration</span>: <span class="name">PointDirection</span> {<span class="name">x</span>: -<span class="name">root</span>.<span class="name">width</span><span class="operator">/</span><span class="number">40</span>; <span class="name">y</span>: -<span class="name">root</span>.<span class="name">height</span><span class="operator">/</span><span class="number">40</span>; <span class="name">xVariation</span>: -<span class="name">root</span>.<span class="name">width</span><span class="operator">/</span><span class="number">20</span>; <span class="name">yVariation</span>: -<span class="name">root</span>.<span class="name">width</span><span class="operator">/</span><span class="number">20</span>}
}
<span class="type"><a href="qml-qtquick-particles-customparticle.html">CustomParticle</a></span> {
<span class="name">vertexShader</span>:<span class="string">"
uniform lowp float qt_Opacity;
varying lowp float fFade;
varying highp vec2 fPos;
void main() {
qt_TexCoord0 = qt_ParticleTex;
highp float size = qt_ParticleData.z;
highp float endSize = qt_ParticleData.w;
highp float t = (qt_Timestamp - qt_ParticleData.x) / qt_ParticleData.y;
highp float currentSize = mix(size, endSize, t * t);
if (t < 0. || t > 1.)
currentSize = 0.;
highp vec2 pos = qt_ParticlePos
- currentSize / 2. + currentSize * qt_ParticleTex // adjust size
+ qt_ParticleVec.xy * t * qt_ParticleData.y // apply velocity vector..
+ 0.5 * qt_ParticleVec.zw * pow(t * qt_ParticleData.y, 2.);
gl_Position = qt_Matrix * vec4(pos.x, pos.y, 0, 1);
highp float fadeIn = min(t * 20., 1.);
highp float fadeOut = 1. - max(0., min((t - 0.75) * 4., 1.));
fFade = fadeIn * fadeOut * qt_Opacity;
fPos = vec2(pos.x/320., pos.y/480.);
}
"</span>
<span class="name">fragmentShader</span>: <span class="string">"
varying highp vec2 fPos;
varying lowp float fFade;
varying highp vec2 qt_TexCoord0;
void main() {//*2 because this generates dark colors mostly
highp vec2 circlePos = qt_TexCoord0*2.0 - vec2(1.0,1.0);
highp float dist = length(circlePos);
highp float circleFactor = max(min(1.0 - dist, 1.0), 0.0);
gl_FragColor = vec4(fPos.x*2.0 - fPos.y, fPos.y*2.0 - fPos.x, fPos.x*fPos.y*2.0, 0.0) * circleFactor * fFade;
}"</span>
}
}
</pre>
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<!-- @@@particles/customparticle/content/fragmentshader.qml -->
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