examples/particles/customparticle/content/blurparticles.qml

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  40
  41 import QtQuick 2.0
  42 import QtQuick.Particles 2.0
  43
  44 Rectangle {
  45     color: "white"
  46     width: 240
  47     height: 360
  48     ParticleSystem {
  49         id: sys
  50     }
  51     Emitter {
  52         system:sys
  53         height: parent.height
  54         emitRate: 1
  55         lifeSpan: 12000
  56         velocity: PointDirection {x:20;}
  57         size: 128
  58     }
  59     ShaderEffectSource {
  60         id: theSource
  61         sourceItem: theItem
  62         hideSource: true
  63     }
  64     Image {
  65         id: theItem
  66         source: "../../images/starfish_1.png"
  67     }
  68
  69     CustomParticle {
  70         system: sys
  71         //! [vertex]
  72         vertexShader:"
  73             uniform lowp float qt_Opacity;
  74             varying lowp float fFade;
  75             varying lowp float fBlur;
  76
  77             void main() {
  78                 defaultMain();
  79                 highp float t = (qt_Timestamp - qt_ParticleData.x) / qt_ParticleData.y;
  80                 highp float fadeIn = min(t * 10., 1.);
  81                 highp float fadeOut = 1. - max(0., min((t - 0.75) * 4., 1.));
  82
  83                 fFade = fadeIn * fadeOut * qt_Opacity;
  84                 fBlur = max(0.2 * t, t * qt_ParticleR);
  85             }
  86         "
  87         //! [vertex]
  88         property variant source: theSource
  89         property variant blurred: ShaderEffectSource {
  90         smooth: true
  91         sourceItem: ShaderEffect {
  92             width: theItem.width
  93             height: theItem.height
  94             property variant delta: Qt.size(0.0, 1.0 / height)
  95             property variant source: ShaderEffectSource {
  96                 smooth: true
  97                 sourceItem: ShaderEffect {
  98                     width: theItem.width
  99                     height: theItem.height
 100                     property variant delta: Qt.size(1.0 / width, 0.0)
 101                     property variant source: theSource
 102                     fragmentShader: "
 103                         uniform sampler2D source;
 104                         uniform lowp float qt_Opacity;
 105                         uniform highp vec2 delta;
 106                         varying highp vec2 qt_TexCoord0;
 107                         void main() {
 108                             gl_FragColor =(0.0538 * texture2D(source, qt_TexCoord0 - 3.182 * delta)
 109                                          + 0.3229 * texture2D(source, qt_TexCoord0 - 1.364 * delta)
 110                                          + 0.2466 * texture2D(source, qt_TexCoord0)
 111                                          + 0.3229 * texture2D(source, qt_TexCoord0 + 1.364 * delta)
 112                                          + 0.0538 * texture2D(source, qt_TexCoord0 + 3.182 * delta)) * qt_Opacity;
 113                         }"
 114                 }
 115             }
 116             fragmentShader: "
 117                 uniform sampler2D source;
 118                 uniform lowp float qt_Opacity;
 119                 uniform highp vec2 delta;
 120                 varying highp vec2 qt_TexCoord0;
 121                 void main() {
 122                     gl_FragColor =(0.0538 * texture2D(source, qt_TexCoord0 - 3.182 * delta)
 123                                  + 0.3229 * texture2D(source, qt_TexCoord0 - 1.364 * delta)
 124                                  + 0.2466 * texture2D(source, qt_TexCoord0)
 125                                  + 0.3229 * texture2D(source, qt_TexCoord0 + 1.364 * delta)
 126                                  + 0.0538 * texture2D(source, qt_TexCoord0 + 3.182 * delta)) * qt_Opacity;
 127                 }"
 128             }
 129         }
 130         //! [fragment]
 131         fragmentShader: "
 132             uniform sampler2D source;
 133             uniform sampler2D blurred;
 134             varying highp vec2 qt_TexCoord0;
 135             varying highp float fBlur;
 136             varying highp float fFade;
 137             void main() {
 138                 gl_FragColor = mix(texture2D(source, qt_TexCoord0), texture2D(blurred, qt_TexCoord0), min(1.0,fBlur*3.0)) * fFade;
 139             }"
 140         //! [fragment]
 141
 142     }
 143 }
 144