curtainsjs

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curtains.js is a lightweight vanilla WebGL javascript library that turns HTML DOM elements into interactive textured planes.

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<h2>What is it ?</h2>
<p>
    Shaders are the new front-end web developpment big thing, with the ability to create very powerful 3D interactions and animations. A lot of very good javascript libraries already handle WebGL but with most of them it's kind of a headache to position your meshes relative to the DOM elements of your web page.
</p>
<p>
    curtains.js was created with just that issue in mind. It is a small vanilla WebGL javascript library that converts HTML elements containing images and videos into 3D WebGL textured planes, allowing you to animate them via shaders.<br />
    You can define each plane size and position via CSS, which makes it super easy to add WebGL responsive planes all over your pages.
</p>
<p style="text-align: center;">
    <img src="https://github.com/martinlaxenaire/curtainsjs/blob/master/documentation/images/promo.gif" alt="curtains.js demo gif" width="300" height="225" />
</p>
<h2>Knowledge and technical requirements</h2>
<p>
    It is easy to use but you will of course have to possess good basics of HTML, CSS and javascript.
</p>
<p>
    If you've never heard about shaders, you may want to learn a bit more about them on <a href="https://thebookofshaders.com/" title="The Book of Shaders" >The Book of Shaders</a> for example. You will have to understand what are the vertex and fragment shaders, the use of uniforms as well as the GLSL syntax basics.
</p>
<h2>Installation and usage</h2>
<div>
    You can directly download the files and start using the ES6 modules:
    
```javascript
import {Curtains, Plane} from 'path/to/src/index.mjs';

const curtains = new Curtains({
    container: "canvas"
});

const plane = new Plane(curtains, document.querySelector("#plane"));
```
</div>
<div>
    Or you can use npm:

```
npm i curtainsjs
```

</div>
<div>
    Load ES6 modules:

```javascript
import {Curtains, Plane} from 'curtainsjs';
```

</div>
<div>
In a browser, you can use the UMD files located in the `dist` directory:
    
```html
<script src="dist/curtains.umd.min.js"></script>
```

```javascript
const curtains = new Curtains({
    container: "canvas"
});

const plane = new Plane(curtains, document.querySelector("#plane"));

// etc
```

</div>

<h3>Usage with React</h3>

Note that if you are using React, you might want to try <a href="https://github.com/martinlaxenaire/react-curtains">react-curtains</a>, curtains.js official React package.

<h2>Documentation</h2>

The library is split into classes modules. Most of them are used internally by the library but there are however a few classes meant to be used directly, exported in the [src/index.mjs](src/index.mjs) file.

<ul>
    <li>
        Curtains: appends a canvas to your container and instanciates the WebGL context. Also handles a few helpers like scroll and resize events, request animation frame loop, etc.
    </li>
    <li>
        Plane: creates a new Plane object bound to a HTML element.
    </li>
    <li>
        Textures: creates a new Texture object.
    </li>
</ul>

<h3>Frame Buffer Objects</h3>

<ul>
    <li>
        RenderTarget: creates a frame buffer object.
    </li>
    <li>
        ShaderPass: creates a post processing pass using a RenderTarget object.
    </li>
</ul>

<h3>Loader</h3>

<ul>
    <li>
        TextureLoader: loads HTML media elements such as images, videos or canvases and creates Texture objects using those sources.
    </li>
</ul>

<ul>
    <li>
        Vec2: creates a new Vector 2.
    </li>
    <li>
        Vec3: creates a new Vector 3.
    </li>
    <li>
        Mat4: creates a new Matrix 4.
    </li>
    <li>
        Quat: creates a new Quaternion.
    </li>
</ul>

<h3>Extras</h3>

<ul>
<li>
        PingPongPlane: creates a plane that uses FBOs ping pong to read/write a texture.
    </li>
    <li>
        FXAAPass: creates an antialiasing FXAA pass using a ShaderPass object.
    </li>
</ul>

<h3>Full documentation</h3>

<p>
    <a href="https://www.curtainsjs.com/get-started.html" title="Getting started" target="_blank">Getting started</a><br />
    <a href="https://www.curtainsjs.com/documentation.html" title="API docs" target="_blank">API docs</a><br />
    <a href="https://www.curtainsjs.com/index.html#examples">Examples</a>
</p>

<h2>Basic example</h2>

```html
<body>
    
    <div id="canvas"></div>
    
    
    <div class="plane">
    
        
        <img src="path/to/my-image.jpg" crossorigin="" />
    </div>
    
</body>
```

```css
body {
    /* make the body fits our viewport */
    position: relative;
    width: 100%;
    height: 100vh;
    margin: 0;
    overflow: hidden;
}

#canvas {
    /* make the canvas wrapper fits the document */
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}

.plane {
    /* define the size of your plane */
    width: 80%;
    height: 80vh;
    margin: 10vh auto;
}

.plane img {
    /* hide the img element */
    display: none;
}
```

<h3>Javascript</h3>

```javascript
import {Curtains, Plane} from 'curtainsjs';

<h3>Shaders</h3>

<h4>Vertex shader</h4>

```glsl
<script id="plane-vs" type="x-shader/x-vertex">
    #ifdef GL_ES
    precision mediump float;
    #endif
    
    // those are the mandatory attributes that the lib sets
    attribute vec3 aVertexPosition;
    attribute vec2 aTextureCoord;
    
    // those are mandatory uniforms that the lib sets and that contain our model view and projection matrix
    uniform mat4 uMVMatrix;
    uniform mat4 uPMatrix;
    
    // our texture matrix that will handle image cover
    uniform mat4 uTextureMatrix0;
    
    // pass your vertex and texture coords to the fragment shader
    varying vec3 vVertexPosition;
    varying vec2 vTextureCoord;
    
    void main() {       
        gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
        
        // set the varyings
        // here we use our texture matrix to calculate the accurate texture coords
        vTextureCoord = (uTextureMatrix0 * vec4(aTextureCoord, 0.0, 1.0)).xy;
        vVertexPosition = aVertexPosition;
    }
</script> 
```

<h4>Fragment shader</h4>

```glsl
<script id="plane-fs" type="x-shader/x-fragment">
    #ifdef GL_ES
    precision mediump float;
    #endif
    
    // get our varyings
    varying vec3 vVertexPosition;
    varying vec2 vTextureCoord;
    
    // the uniform we declared inside our javascript
    uniform float uTime;
    
    // our texture sampler (default name, to use a different name please refer to the documentation)
    uniform sampler2D uSampler0;
    
    void main() {
        // get our texture coords from our varying
        vec2 textureCoord = vTextureCoord;
        
        // displace our pixels along the X axis based on our time uniform
        // textures coords are ranging from 0.0 to 1.0 on both axis
        textureCoord.x += sin(textureCoord.y * 25.0) * cos(textureCoord.x * 25.0) * (cos(uTime / 50.0)) / 25.0;
        
        // map our texture with the texture matrix coords
        gl_FragColor = texture2D(uSampler0, textureCoord);
    }
</script> 
```

<h2>Changelog</h2>

Complete [changelog](CHANGELOG.md) starting from version 7.1.0

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