136 lines
2.5 KiB
JavaScript
136 lines
2.5 KiB
JavaScript
var color = use('color')
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var graphics = use('graphics')
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var transform = use('transform')
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var ex = {}
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ex.emitters = new Set()
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ex.garbage = function()
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{
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ex.emitters.delete(this)
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}
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ex.update = function(dt)
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{
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for (var e of ex.emitters)
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try { e.step(dt) } catch(e) { log.error(e) }
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}
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ex.step_hook = function(p)
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{
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if (p.time < this.grow_for) {
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var s = Math.lerp(0, this.scale, p.time / this.grow_for);
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p.transform.scale = s;
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} else if (p.time > p.life - this.shrink_for) {
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var s = Math.lerp(0, this.scale, (p.life - p.time) / this.shrink_for);
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p.transform.scale = s;
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} else p.transform.scale = [this.scale, this.scale, this.scale];
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}
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ex.step = function(dt)
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{
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// update spawning particles
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if (this.on && this.pps > 0) {
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this.spawn_timer += dt;
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var pp = 1 / this.pps;
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while (this.spawn_timer > pp) {
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this.spawn_timer -= pp;
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this.spawn();
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}
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}
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// update all particles
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for (var p of this.particles) {
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p.time += dt;
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p.transform.move(p.body.velocity?.scale(dt));
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this.step_hook?.(p);
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if (this.kill_hook?.(p) || p.time >= p.life) {
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this.die_hook?.(p);
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this.dead.push(p);
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this.particles.delete(p);
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}
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}
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}
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ex.burst = function(count,t)
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{
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for (var i = 0; i < count; i++) this.spawn(t)
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}
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ex.spawn = function(t)
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{
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t ??= this.transform
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var par = this.dead.shift()
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if (par) {
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par.transform.unit()
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par.transform.pos = t.pos;
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par.transform.scale = this.scale;
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this.particles.push(par);
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par.time = 0;
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this.spawn_hook?.(par);
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par.life = this.life;
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return;
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}
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par = {
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transform: new transform,
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life: this.life,
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time: 0,
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color: this.color,
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body:{},
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}
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par.transform.scale = this.scale
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this.particles.push(par)
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this.spawn_hook(par)
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}
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ex.stat = function()
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{
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var stat = {};
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stat.emitters = emitters.length;
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var particles = 0;
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for (var e of emitters) particles += e.particles.length;
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stat.particles = particles;
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return stat;
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}
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ex.life = 10
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ex.scale = 1
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ex.grow_for = 0
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ex.spawn_timer = 0
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ex.pps = 0
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ex.color = color.white
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ex.draw = function()
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{
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/* var diff = graphics.texture(this.diffuse)
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if (!diff) throw new Error("emitter does not have a proper diffuse texture")
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var mesh = graphics.make_sprite_mesh(this.particles)
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if (mesh.num_indices === 0) return
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render.queue({
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type:'geometry',
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mesh,
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image:diff,
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pipeline,
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first_index:0,
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num_indices:mesh.num_indices
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})
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*/
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}
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return ex
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---
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this.particles = []
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this.dead = []
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this.transform = this.overling.transform
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$.emitters.add(this)
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