skia2/resources/particles/confetti.json

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{
"MaxCount": 200,
"Drawable": {
"Type": "SkCircleDrawable",
"Radius": 8
},
"EffectCode": [
"void effectSpawn(inout Effect effect) {",
" effect.lifetime = 2;",
"}",
"",
"void effectUpdate(inout Effect effect) {",
" if (effect.age < 0.25 || effect.age > 0.75) { effect.rate = 0; }",
" else { effect.rate = 200; }",
"}",
""
],
"Code": [
"void spawn(inout Particle p) {",
" float3 colors[4];",
" colors[0] = float3(0.87, 0.24, 0.11);",
" colors[1] = float3(1, 0.9, 0.2);",
" colors[2] = float3(0.44, 0.73, 0.24);",
" colors[3] = float3(0.38, 0.54, 0.95);",
" int idx = int(rand * 4);",
" p.color.rgb = colors[idx];",
"",
" p.lifetime = (1 - effect.age) * effect.lifetime;",
" p.scale = mix(0.6, 1, rand);",
"}",
"",
"void update(inout Particle p) {",
" p.color.a = 1 - p.age;",
"",
" float a = radians(rand * 360);",
" float invAge = 1 - p.age;",
" p.vel = float2(cos(a), sin(a)) * mix(250, 550, rand) * invAge * invAge;",
"}",
""
],
"Bindings": []
}