| { |
| "MaxCount": 32, |
| "Duration": 1, |
| "Rate": 8, |
| "Drawable": { |
| "Type": "SkImageDrawable", |
| "Path": "resources/images/explosion_sprites.png", |
| "Columns": 4, |
| "Rows": 4 |
| }, |
| "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;", |
| "};", |
| "", |
| "float2 circle() {", |
| " float x;", |
| " float y;", |
| " do {", |
| " x = rand * 2 - 1;", |
| " y = rand * 2 - 1;", |
| " } while (x*x + y*y > 1);", |
| " return float2(x, y);", |
| "}", |
| "", |
| "void spawn(inout Particle p) {", |
| " p.lifetime = 1.0 + rand * 2.0;", |
| " p.pos = circle() * 60;", |
| " p.vel = p.pos / 3;", |
| "}", |
| "", |
| "void update(inout Particle p) {", |
| " p.frame = p.age;", |
| "}", |
| "" |
| ], |
| "Bindings": [] |
| } |