| { |
| "MaxCount": 4096, |
| "Duration": 1, |
| "Rate": 400, |
| "Drawable": { |
| "Type": "SkCircleDrawable", |
| "Radius": 2 |
| }, |
| "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 = 1 + 2 * rand;", |
| " p.pos.x = rand * 50;", |
| " float a = radians(-10 + 20 * rand);", |
| " float s = 50 + 10 * rand;", |
| " p.vel.x = sin(a) * s;", |
| " p.vel.y = -cos(a) * s;", |
| "}", |
| "", |
| "void update(inout Particle p) {", |
| " p.vel.x += wind(p.age) * dt;", |
| " p.scale = 3 - (1.5 * p.age);", |
| " p.color = color(p.age);", |
| "}", |
| "" |
| ], |
| "Bindings": [ |
| { |
| "Type": "SkCurveBinding", |
| "Name": "wind", |
| "Curve": { |
| "XValues": [], |
| "Segments": [ |
| { |
| "Type": "Cubic", |
| "Ranged": false, |
| "Bidirectional": true, |
| "A0": 180, |
| "B0": -90, |
| "C0": -120, |
| "D0": -200 |
| } |
| ] |
| } |
| }, |
| { |
| "Type": "SkColorCurveBinding", |
| "Name": "color", |
| "Curve": { |
| "XValues": [], |
| "Segments": [ |
| { |
| "Type": "Linear", |
| "Ranged": true, |
| "A0": [ 1, 0, 0, 1 ], |
| "D0": [ 1, 0.735294, 0, 1 ], |
| "A1": [ 1, 0.588235, 0, 1 ], |
| "D1": [ 0.941177, 1, 0, 1 ] |
| } |
| ] |
| } |
| } |
| ] |
| } |