examples/particles/customparticle/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         speed: 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         vertexShader:"
  72             uniform lowp float qt_Opacity;
  73             varying lowp float fFade;
  74             varying lowp float fBlur;
  75
  76             void main() {
  77                 defaultMain();
  78                 highp float t = (qt_Timestamp - qt_ParticleData.x) / qt_ParticleData.y;
  79                 highp float fadeIn = min(t * 10., 1.);
  80                 highp float fadeOut = 1. - max(0., min((t - 0.75) * 4., 1.));
  81
  82                 fFade = fadeIn * fadeOut * qt_Opacity;
  83                 fBlur = max(0.2 * t, t * qt_ParticleR);
  84             }
  85         "
  86         property variant source: theSource
  87         property variant blurred: ShaderEffectSource {
  88         smooth: true
  89         sourceItem: ShaderEffect {
  90             width: theItem.width
  91             height: theItem.height
  92             property variant delta: Qt.size(0.0, 1.0 / height)
  93             property variant source: ShaderEffectSource {
  94                 smooth: true
  95                 sourceItem: ShaderEffect {
  96                     width: theItem.width
  97                     height: theItem.height
  98                     property variant delta: Qt.size(1.0 / width, 0.0)
  99                     property variant source: theSource
 100                     fragmentShader: "
 101                         uniform sampler2D source;
 102                         uniform lowp float qt_Opacity;
 103                         uniform highp vec2 delta;
 104                         varying highp vec2 qt_TexCoord0;
 105                         void main() {
 106                             gl_FragColor =(0.0538 * texture2D(source, qt_TexCoord0 - 3.182 * delta)
 107                                          + 0.3229 * texture2D(source, qt_TexCoord0 - 1.364 * delta)
 108                                          + 0.2466 * texture2D(source, qt_TexCoord0)
 109                                          + 0.3229 * texture2D(source, qt_TexCoord0 + 1.364 * delta)
 110                                          + 0.0538 * texture2D(source, qt_TexCoord0 + 3.182 * delta)) * qt_Opacity;
 111                         }"
 112                 }
 113             }
 114             fragmentShader: "
 115                 uniform sampler2D source;
 116                 uniform lowp float qt_Opacity;
 117                 uniform highp vec2 delta;
 118                 varying highp vec2 qt_TexCoord0;
 119                 void main() {
 120                     gl_FragColor =(0.0538 * texture2D(source, qt_TexCoord0 - 3.182 * delta)
 121                                  + 0.3229 * texture2D(source, qt_TexCoord0 - 1.364 * delta)
 122                                  + 0.2466 * texture2D(source, qt_TexCoord0)
 123                                  + 0.3229 * texture2D(source, qt_TexCoord0 + 1.364 * delta)
 124                                  + 0.0538 * texture2D(source, qt_TexCoord0 + 3.182 * delta)) * qt_Opacity;
 125                 }"
 126             }
 127         }
 128         fragmentShader: "
 129             uniform sampler2D source;
 130             uniform sampler2D blurred;
 131             varying highp vec2 qt_TexCoord0;
 132             varying highp float fBlur;
 133             varying highp float fFade;
 134             void main() {
 135                 gl_FragColor = mix(texture2D(source, qt_TexCoord0), texture2D(blurred, qt_TexCoord0), min(1.0,fBlur*3.0)) * fFade;
 136             }"
 137
 138     }
 139 }
 140