skia2/resources/particles/path_spawn.json

{
   "MaxCount": 800,
   "Drawable": {
      "Type": "SkCircleDrawable",
      "Radius": 2
   },
   "Code": [
      "void effectSpawn(inout Effect effect) {",
      "  effect.lifetime = 1;",
      "  effect.rate = 100;",
      "}",
      "",
      "void spawn(inout Particle p) {",
      "  float4 pos_and_normal = my_path(rand(p.seed));",
      "  p.pos = pos_and_normal.xy;",
      "  p.vel = pos_and_normal.zw * -5;",
      "",
      "  p.lifetime = 2;",
      "}",
      "",
      "void update(inout Particle p) {",
      "}",
      ""
   ],
   "Bindings": [
      {
         "Type": "SkPathBinding",
         "Name": "my_path",
         "PathPath": "",
         "PathName": "star"
      }
   ]
}