migalib/dist/gameloop.js

MIGAlib - MInimal GAme LIBrary

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.GameLoop = void 0;
var mouse_1 = require("./mouse");
var splashscreen_1 = require("./splashscreen");
var GameLoopSingleton = /** @class */ (function () {
    function GameLoopSingleton() {
        this.rAF = null;
        this.now = null;
        this.last = null;
        this.accumulator = 0;
        this.fps = 60;
        this.delta = 1e3 / this.fps;
        this.step = 1 / this.fps;
        this.deltaTime = 0;
        this.currentDeltaTime = 0;
        this.timeSinceStart = 0;
        this.frameLimit = 1e3 / 30;
        this.frameLimitActive = false;
        this.fpsAccumulator = 0;
    }
    GameLoopSingleton.prototype.init = function (update, render) {
        this.update = update;
        this.render = render;
    };
    GameLoopSingleton.prototype.frame = function () {
        var _this = this;
        this.rAF = requestAnimationFrame(function () { return _this.frame(); });
        this.now = performance.now();
        this.deltaTime = this.now - this.last;
        this.last = this.now;
        this.currentDeltaTime = this.deltaTime * 0.001;
        this.timeSinceStart += this.currentDeltaTime;
        // prevent updating the game with a very large dt if the game were to lose focus
        // and then regain focus later
        if (this.deltaTime > 1e3) {
            return;
        }
        this.accumulator += this.deltaTime;
        while (this.accumulator >= this.delta) {
            mouse_1.Mouse.update();
            this.update();
            this.accumulator -= this.delta;
        }
        if (this.frameLimitActive) {
            this.fpsAccumulator += this.deltaTime;
            while (this.fpsAccumulator >= this.frameLimit) {
                this.render();
                this.fpsAccumulator -= this.frameLimit;
            }
        }
        else {
            this.render();
        }
    };
    GameLoopSingleton.prototype.start = function () {
        return __awaiter(this, void 0, void 0, function () {
            var _this = this;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        if (!(this.update && this.render)) return [3 /*break*/, 2];
                        return [4 /*yield*/, this.wait()];
                    case 1:
                        _a.sent();
                        splashscreen_1.SplashScreen.hideSplashScreen();
                        this.last = performance.now();
                        requestAnimationFrame(function () { return _this.frame(); });
                        return [3 /*break*/, 3];
                    case 2:
                        console.log("Update / Render functions are not yet initialized. Did you forget to call migalib.init()?");
                        _a.label = 3;
                    case 3: return [2 /*return*/];
                }
            });
        });
    };
    GameLoopSingleton.prototype.wait = function () {
        return new Promise(function (resolve) { return setTimeout(function () { return resolve(); }, 1500); });
    };
    GameLoopSingleton.prototype.stop = function () {
        cancelAnimationFrame(this.rAF);
    };
    GameLoopSingleton.prototype.getDeltaTime = function () {
        return this.delta * 0.001;
    };
    GameLoopSingleton.prototype.setFpsLimit = function (fpsLimit) {
        if (fpsLimit <= 0) {
            this.frameLimitActive = false;
        }
        else {
            this.frameLimitActive = true;
            this.frameLimit = 1e3 / fpsLimit;
        }
    };
    GameLoopSingleton.prototype.getFpsLimit = function () {
        if (!this.frameLimitActive) {
            return 0;
        }
        else {
            return this.frameLimit * 1e3;
        }
    };
    GameLoopSingleton.prototype.getRenderDeltaTime = function () {
        return this.currentDeltaTime;
    };
    GameLoopSingleton.prototype.getTimeSinceStart = function () {
        return this.timeSinceStart;
    };
    return GameLoopSingleton;
}());
exports.GameLoop = new GameLoopSingleton();