fps_controller.js

//https://stackoverflow.com/questions/19764018/controlling-fps-with-requestanimationframe
define(["require", "exports"], function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    class FPSController {
        constructor(target_fps) {
            this.enabled = false;
            this.fpsInterval = 1000 / target_fps;
            this.then = Date.now();
            this.startTime = this.then;
        }
        UpdateTargetFPS(target_fps) {
            this.fpsInterval = 1000 / target_fps;
        }
        IsFrameReady() {
            this.now = Date.now();
            this.elapsed = this.now - this.then;
            // if enough time has elapsed, draw the next frame
            if (this.elapsed > this.fpsInterval) {
                // Get ready for next frame by setting then=now, but also adjust for your
                // specified fpsInterval not being a multiple of RAF's interval (16.7ms)
                this.then = this.now - (this.elapsed % this.fpsInterval);
                return true;
            }
            else
                return false;
        }
    }
    exports.FPSController = FPSController;
});
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