game-loop-js's Introduction

game-loop-js 🎮 🔁

Lightweight
Built with speed in mind
Ensure consistent frame-rates (based on the targeted FPS of your choosing)
The targeted FPS is tweakable on-the-fly (while the game is running)
This implementation does not have a requestAnimationFrame loop, it let you implement it yourself or not (because in some cases it's handled by the framework, ex: threejs in a WebXR project)
"Normalize" the deltaTime at the source to make sure 1 equals 1 second (instead of 1 millisecond), because many calculations are expressed in seconds instead of milliseconds (ex: gravity force is -9.81 meters per seconds) so this prevents you from "/ 1000" everywhere in your actual code, it's done at the source, one time.

Usage

npm install @wmcmurray/game-loop-js

Three.js / requestAnimationFrame()

import { createGameLoop } from '@wmcmurray/game-loop-js'

const myGameLoop = function(deltaTime) {
  // ...
};

// how to create a game loop with a targeted 60 FPS :
const gameLoop = createGameLoop(myGameLoop, 60);

// how to change the targeted FPS :
gameLoop.fps = 144;

// how to get the targeted FPS :
const targetFps = gameLoop.fps;


// how to register the loop :

// using three.js
renderer.setAnimationLoop( gameLoop.loop );

// -- or --

// using requestAnimationFrame
function animate( time ) {
  gameLoop.loop( time );
  requestAnimationFrame( animate );
}
requestAnimationFrame( animate );

Browser

<script type="text/javascript" src="/dist/bundle.umd.js"></script>

<script type="text/javascript">
  const myGameLoop = function(deltaTime) {
    // ...
  };

  const gameLoop = gameLoopJs.createGameLoop(myGameLoop);

  function animate( time ) {
    gameLoop.loop( time );
    requestAnimationFrame( animate );
  }
  requestAnimationFrame( animate );
</script>

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