cables_dev/cables/src/core/cg/sg_fpscounter.js

import { Events } from "cables-shared-client";

export default class FpsCounter extends Events
{
    constructor()
    {
        super();
        this._timeStartFrame = 0;
        this._timeStartSecond = 0;
        this._fpsCounter = 0;
        this._msCounter = 0;
        this._frameCount = 0;

        this.stats = { "ms": 0, "fps": 0 };
    }

    get frameCount()
    {
        return this._frameCount;
    }

    startFrame()
    {
        this._timeStartFrame = CABLES.now();
    }

    endFrame()
    {
        this._frameCount++;
        this._fpsCounter++;

        const timeFrame = CABLES.now() - this._timeStartFrame;
        this._msCounter += timeFrame;

        if (CABLES.now() - this._timeStartSecond > 1000)
        {
            this.endSecond();
        }
    }

    endSecond()
    {
        this.stats.fps = this._fpsCounter;
        this.stats.ms = Math.round(this._msCounter / this._fpsCounter * 100) / 100;

        this.emitEvent("performance", this.stats);

        // reset
        this._fpsCounter = 0;
        this._msCounter = 0;
        this._timeStartSecond = CABLES.now();
    }
}