Qt 5.7 | Qt Quick | Qt Quick Particles Examples - CustomParticle | blurparticles.qml Example File

Qt 5.7.1 Reference Documentation

# blurparticles.qml Example File

particles/customparticle/content/blurparticles.qml

      /****************************************************************************
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      ** This file is part of the examples of the Qt Toolkit.
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      ** $QT_BEGIN_LICENSE:BSD$
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      import QtQuick 2.0
      import QtQuick.Particles 2.0

      Rectangle {
          color: "white"
          width: 240
          height: 360
          ParticleSystem {
              id: sys
          }
          Emitter {
              system:sys
              height: parent.height
              emitRate: 1
              lifeSpan: 12000
              velocity: PointDirection {x:20;}
              size: 128
          }
          ShaderEffectSource {
              id: theSource
              sourceItem: theItem
              hideSource: true
          }
          Image {
              id: theItem
              source: "../../images/starfish_1.png"
          }

          CustomParticle {
              system: sys
              vertexShader:"
                  uniform lowp float qt_Opacity;
                  varying lowp float fFade;
                  varying lowp float fBlur;

                  void main() {
                      defaultMain();
                      highp float t = (qt_Timestamp - qt_ParticleData.x) / qt_ParticleData.y;
                      highp float fadeIn = min(t * 10., 1.);
                      highp float fadeOut = 1. - max(0., min((t - 0.75) * 4., 1.));

                      fFade = fadeIn * fadeOut * qt_Opacity;
                      fBlur = max(0.2 * t, t * qt_ParticleR);
                  }
              "
              property variant source: theSource
              property variant blurred: ShaderEffectSource {
              sourceItem: ShaderEffect {
                  width: theItem.width
                  height: theItem.height
                  property variant delta: Qt.size(0.0, 1.0 / height)
                  property variant source: ShaderEffectSource {
                      sourceItem: ShaderEffect {
                          width: theItem.width
                          height: theItem.height
                          property variant delta: Qt.size(1.0 / width, 0.0)
                          property variant source: theSource
                          fragmentShader: "
                              uniform sampler2D source;
                              uniform lowp float qt_Opacity;
                              uniform highp vec2 delta;
                              varying highp vec2 qt_TexCoord0;
                              void main() {
                                  gl_FragColor =(0.0538 * texture2D(source, qt_TexCoord0 - 3.182 * delta)
                                               + 0.3229 * texture2D(source, qt_TexCoord0 - 1.364 * delta)
                                               + 0.2466 * texture2D(source, qt_TexCoord0)
                                               + 0.3229 * texture2D(source, qt_TexCoord0 + 1.364 * delta)
                                               + 0.0538 * texture2D(source, qt_TexCoord0 + 3.182 * delta)) * qt_Opacity;
                              }"
                      }
                  }
                  fragmentShader: "
                      uniform sampler2D source;
                      uniform lowp float qt_Opacity;
                      uniform highp vec2 delta;
                      varying highp vec2 qt_TexCoord0;
                      void main() {
                          gl_FragColor =(0.0538 * texture2D(source, qt_TexCoord0 - 3.182 * delta)
                                       + 0.3229 * texture2D(source, qt_TexCoord0 - 1.364 * delta)
                                       + 0.2466 * texture2D(source, qt_TexCoord0)
                                       + 0.3229 * texture2D(source, qt_TexCoord0 + 1.364 * delta)
                                       + 0.0538 * texture2D(source, qt_TexCoord0 + 3.182 * delta)) * qt_Opacity;
                      }"
                  }
              }
              fragmentShader: "
                  uniform sampler2D source;
                  uniform sampler2D blurred;
                  varying highp vec2 qt_TexCoord0;
                  varying highp float fBlur;
                  varying highp float fFade;
                  void main() {
                      gl_FragColor = mix(texture2D(source, qt_TexCoord0), texture2D(blurred, qt_TexCoord0), min(1.0,fBlur*3.0)) * fFade;
                  }"

          }
      }