resources/particles/interp.json

{
   "MaxCount": 6000,
   "Duration": 5,
   "Rate": 2000,
   "Life": {
      "Input": {
         "Source": "Age",
         "TileMode": "Repeat",
         "Left": 0,
         "Right": 1
      },
      "XValues": [],
      "Segments": [
         {
            "Type": "Constant",
            "Ranged": true,
            "Bidirectional": false,
            "A0": 2,
            "A1": 4
         }
      ]
   },
   "Drawable": {
      "Type": "SkCircleDrawable",
      "Radius": 2
   },
   "Spawn": [
      {
         "Type": "SkFrameAffector",
         "Enabled": true,
         "Curve": {
            "Input": {
               "Source": "Random",
               "TileMode": "Repeat",
               "Left": 0,
               "Right": 1
            },
            "XValues": [],
            "Segments": [
               {
                  "Type": "Linear",
                  "Ranged": false,
                  "Bidirectional": false,
                  "A0": 0,
                  "D0": 1
               }
            ]
         }
      },
      {
         "Type": "SkInterpreterAffector",
         "Enabled": true,
         "Code": "layout(ctype=float) in uniform float dt;\nlayout(ctype=float) in uniform float effectAge;\n\nvoid main(in    float age,\n          in    float invLifetime,\n          inout float2 pos,\n          inout float2 dir,\n          inout float  scale,\n          inout float2 vel,\n          inout float  spin,\n          inout float4 color,\n          in    float  t) {\n  float r = t;\n  vel.x = 50 + (30 * r);\n  r = (r * 7) % 1;\n  vel.y = (r * 20) - 10;\n  r = (r * 11) % 1;\n}\n"
      }
   ],
   "Update": [
      {
         "Type": "SkInterpreterAffector",
         "Enabled": true,
         "Code": "layout(ctype=float) in uniform float dt;\nlayout(ctype=float) in uniform float effectAge;\n\nvoid main(in    float age,\n          in    float invLifetime,\n          inout float2 pos,\n          inout float2 dir,\n          inout float  scale,\n          inout float2 vel,\n          inout float  spin,\n          inout float4 color,\n          in    float  t) {\n  color.r = age;\n  color.g = 1 - age;\n\n  float x = age;\n  float ix = 1 - age;\n\n  scale = 0.5 * ix*ix*ix + 3*ix*ix*x + 2*3*ix*x*x + 0.5*x*x*x;\n\n  vel.y += 20.0 * dt;\n}\n"
      }
   ]
}