skia2/resources/particles/mandrill.json

{
   "MaxCount": 4000,
   "Drawable": {
      "Type": "SkCircleDrawable",
      "Radius": 3
   },
   "EffectCode": [
      "void effectSpawn(inout Effect effect) {",
      "  effect.rate = 4000;",
      "}",
      "",
      "void effectUpdate(inout Effect effect) {",
      "}",
      ""
   ],
   "Code": [
      "void spawn(inout Particle p) {",
      "  p.lifetime = 1;",
      "  p.pos = float2(rand(p.seed), rand(p.seed)) * 200;",
      "  p.vel = float2(rand(p.seed), rand(p.seed)) * 2 - 1;",
      "  p.vel *= 20;",
      "  p.scale = mix(0.25, 1, rand(p.seed));",
      "}",
      "",
      "void update(inout Particle p) {",
      "  p.color = img(p.pos / 200);",
      "}",
      ""
   ],
   "Bindings": [
      {
         "Type": "SkImageBinding",
         "Name": "img",
         "ImagePath": "images",
         "ImageName": "mandrill_128.png"
      }
   ]
}