playcanvas/build/playcanvas.dbg/src/extras/mini-stats/stats-timer.js

Open-source WebGL/WebGPU 3D engine for the web

// Stats timer interface for graph
class StatsTimer {
    get timings() {
        return this.values;
    }
    constructor(app, statNames, decimalPlaces, unitsName, multiplier){
        this.app = app;
        this.values = [];
        // support one or more stats and accumulate them in the graph total
        this.statNames = statNames;
        this.unitsName = unitsName;
        this.decimalPlaces = decimalPlaces;
        this.multiplier = multiplier || 1;
        // recursively look up properties of objects specified in a string
        const resolve = (path, obj)=>{
            return path.split('.').reduce((prev, curr)=>{
                if (!prev) return null;
                // handle Map objects
                if (prev instanceof Map) {
                    return prev.get(curr);
                }
                return prev[curr];
            }, obj || this);
        };
        app.on('frameupdate', (ms)=>{
            for(let i = 0; i < this.statNames.length; i++){
                // read specified stat from app.stats object
                const value = resolve(this.statNames[i], this.app.stats);
                this.values[i] = (value ?? 0) * this.multiplier;
            }
        });
    }
}

export { StatsTimer };