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https://github.com/akira-cn/node-canvas-webgl

Integration of node-canvas and headless-gl.
https://github.com/akira-cn/node-canvas-webgl

canvas node-canvas node-webgl nodejs webgl

Last synced: 3 days ago
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Integration of node-canvas and headless-gl.

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README 

        
# node-canvas-webgl



Integration of [node-canvas](https://github.com/Automattic/node-canvas) and [headless-gl](https://github.com/stackgl/headless-gl).



## Demos:



#### with threejs



```js

const fs = require('fs');

const THREE = require('three');

const GIFEncoder = require('gifencoder');

const {createCanvas} = require('../lib');



const width = 512,

  height = 512;



const scene = new THREE.Scene();

const camera = new THREE.PerspectiveCamera(75, width / height, 0.1, 1000);



const canvas = createCanvas(width, height);



const renderer = new THREE.WebGLRenderer({

  canvas,

});



const geometry = new THREE.BoxGeometry(1, 1, 1);

const material = new THREE.MeshBasicMaterial({color: 0x00ff00});

const cube = new THREE.Mesh(geometry, material);

scene.add(cube);



camera.position.z = 5;



const encoder = new GIFEncoder(width, height);

encoder.createReadStream().pipe(fs.createWriteStream('./snapshot/threejs-cube.gif'));

encoder.start();

encoder.setRepeat(0); // 0 for repeat, -1 for no-repeat

encoder.setDelay(16); // frame delay in ms

encoder.setQuality(10); // image quality. 10 is default.



let idx = 0;

function update() {

  cube.rotation.x += 0.01;

  cube.rotation.y += 0.01;

  renderer.render(scene, camera);

  if(idx > 0) {

    encoder.addFrame(canvas.__ctx__);

    console.log(`add frame ${idx}`);

  }

  idx++;

  if(idx < 500) {

    setTimeout(update, 16);

  }

}

update();

```



![](https://p2.ssl.qhimg.com/t01abe0b6dc18945e43.gif)



#### with claygl



```js

const fs = require('fs');

const GIFEncoder = require('gifencoder');

const clay = require('claygl');

const {createCanvas} = require('../lib');



const width = 512,

  height = 512;



const canvas = createCanvas(width, height);



const encoder = new GIFEncoder(width, height);



let idx = 0;



// polyfill

global.document = {

  createElement() {

    return createCanvas(300, 150);

  },

};



clay.application.create(canvas, {



  width,

  height,



  init(app) {

    // Create camera

    this._camera = app.createCamera([0, 2, 5], [0, 0, 0]);



    // Create a RED cube

    this._cube = app.createCube({

      color: [1, 0, 0],

    });



    // Create light

    this._mainLight = app.createDirectionalLight([-1, -1, -1]);

    // app.createAmbientLight('#fff', 1.0);



    encoder.createReadStream().pipe(fs.createWriteStream('./snapshot/claygl-cube.gif'));

    encoder.start();

    encoder.setRepeat(0); // 0 for repeat, -1 for no-repeat

    encoder.setDelay(16); // frame delay in ms

    encoder.setQuality(10); // image quality. 10 is default.

  },

  loop(app) {

    this._cube.rotation.rotateY(16 / 1000);

    if(idx > 0) {

      encoder.addFrame(canvas.__ctx__);

      console.log(`add frame ${idx}`);

    }

    idx++;

    if(idx > 197) {

      process.exit(-1);

    }

  },

});

```



![](https://p3.ssl.qhimg.com/t011d79d79adb1b649e.gif)



#### with babylonjs



```js

const fs = require('fs');

const BABYLON = require('babylonjs');

const {createCanvas} = require('../lib');



// polyfill

global.HTMLElement = function () {};

global.window = {

  setTimeout,

  addEventListener() {},

};

global.navigator = {};

global.document = {

  createElement() {

    return createCanvas(300, 150);

  },

  addEventListener() {},

};



// Get the canvas DOM element

const canvas = createCanvas(512, 512);



// Load the 3D engine

const engine = new BABYLON.Engine(canvas, true, {preserveDrawingBuffer: true, stencil: true});



// CreateScene function that creates and return the scene

const createScene = function () {

  // Create a basic BJS Scene object

  const scene = new BABYLON.Scene(engine);

  // Create a FreeCamera, and set its position to {x: 0, y: 5, z: -10}

  const camera = new BABYLON.FreeCamera('camera1', new BABYLON.Vector3(0, 5, -10), scene);

  // Target the camera to scene origin

  camera.setTarget(BABYLON.Vector3.Zero());

  // Attach the camera to the canvas

  camera.attachControl(canvas, false);

  // Create a basic light, aiming 0, 1, 0 - meaning, to the sky

  const light = new BABYLON.HemisphericLight('light1', new BABYLON.Vector3(0, 1, 0), scene);

  // Create a built-in "sphere" shape; its constructor takes 6 params: name, segment, diameter, scene, updatable, sideOrientation

  const sphere = BABYLON.Mesh.CreateSphere('sphere1', 16, 2, scene, false, BABYLON.Mesh.FRONTSIDE);

  // Move the sphere upward 1/2 of its height

  sphere.position.y = 1;

  // Create a built-in "ground" shape; its constructor takes 6 params : name, width, height, subdivision, scene, updatable

  const ground = BABYLON.Mesh.CreateGround('ground1', 6, 6, 2, scene, false);

  // Return the created scene

  return scene;

};



// call the createScene function

const scene = createScene();



scene.render();



fs.writeFileSync('./snapshot/snap-babylon.png', canvas.toBuffer());

```



![](https://p5.ssl.qhimg.com/t01d9af9c9428b18585.png)



#### with mesh.js



```js

const fs = require('fs');

const {Renderer, Figure2D, Mesh2D} = require('@mesh.js/core');

const {createCanvas, loadImage} = require('../lib');



const width = 512,

  height = 512;



const canvas = createCanvas(width, height);



const renderer = new Renderer(canvas, {contextType: 'webgl'});



const f = new Figure2D();

f.rect(0, 0, 512, 512);



const m = new Mesh2D(f, canvas);

m.setFill({color: '#ddd'});



const url = 'https://p0.ssl.qhimg.com/t01a72262146b87165f.png';



loadImage(url).then((image) => {

  const texture = renderer.createTexture(image);

  m.setTexture(texture);

  renderer.drawMeshes([m]);

  fs.writeFileSync('./snapshot/snap-spritejs.png', canvas.toBuffer());

});

```



![](https://p2.ssl.qhimg.com/t01c3b877430c190327.png)



#### with jsdom



You can use canvas2d and webgl as running in web browsers.



```js

const fs = require('fs');

const {Renderer, Figure2D, Mesh2D} = require('@mesh.js/core');



require('jsdom-global')();



const {mockDOM} = require('../lib');

mockDOM(window);



const canvas = document.createElement('canvas');

canvas.width = 512;

canvas.height = 512;



const renderer = new Renderer(canvas, {contextType: 'webgl'});



const f = new Figure2D();

f.rect(0, 0, 512, 512);



const m = new Mesh2D(f, canvas);

m.setFill({color: '#ddd'});



const url = 'https://p0.ssl.qhimg.com/t01a72262146b87165f.png';



renderer.loadTexture(url).then((texture) => {

  m.setTexture(texture);

  renderer.drawMeshes([m]);

  fs.writeFileSync('./snapshot/snap-meshjs2.png', canvas.toBuffer());

});

```