| { |
| "MaxCount": 32, |
| "Duration": 1, |
| "Rate": 0.5, |
| "Drawable": { |
| "Type": "SkImageDrawable", |
| "Path": "resources/images/baby_tux.png", |
| "Columns": 1, |
| "Rows": 1 |
| }, |
| "Code": [ |
| "// float rand; Every read returns a random float [0 .. 1)", |
| "layout(ctype=float) in uniform float dt;", |
| "layout(ctype=float) in uniform float effectAge;", |
| "", |
| "struct Particle {", |
| " float age;", |
| " float lifetime;", |
| " float2 pos;", |
| " float2 dir;", |
| " float scale;", |
| " float2 vel;", |
| " float spin;", |
| " float4 color;", |
| " float frame;", |
| "};", |
| "", |
| "void spawn(inout Particle p) {", |
| " p.lifetime = 20;", |
| " float a = radians(10 + 60 * rand);", |
| " float s = 140 + rand * 60;", |
| " p.vel.x = cos(a) * s;", |
| " p.vel.y = -sin(a) * s;", |
| "}", |
| "", |
| "void update(inout Particle p) {", |
| " p.vel.y += 50 * dt;", |
| " p.dir = normalize(p.vel);", |
| "}", |
| "" |
| ], |
| "Bindings": [] |
| } |