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A WebGL & HTML5 graph based video composition library
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<title>JSDoc: Source: ProcessingNodes/compositingnode.js</title>
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<h1 class="page-title">Source: ProcessingNodes/compositingnode.js</h1>
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<pre class="prettyprint source linenums"><code>//Matthew Shotton, R&D User Experience,© BBC 2015
import ProcessingNode from "./processingnode";
import { createElementTexutre } from "../utils.js";
class CompositingNode extends ProcessingNode{
/**
* Initialise an instance of a Compositing Node. You should not instantiate this directly, but use VideoContest.createCompositingNode().
*/
constructor(gl, renderGraph, definition){
let placeholderTexture = createElementTexutre(gl);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0]));
super(gl, renderGraph, definition, definition.inputs, false);
this._placeholderTexture = placeholderTexture;
this._displayName = "CompositingNode";
}
_render(){
let gl = this._gl;
gl.bindFramebuffer(gl.FRAMEBUFFER, this._framebuffer);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, this._texture,0);
gl.clearColor(0, 0, 0, 0); // green;
gl.clear(gl.COLOR_BUFFER_BIT);
gl.blendFuncSeparate(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
this.inputs.forEach((node) => {
if (node === undefined)return;
super._render();
//map the input textures input the node
var texture = node._texture;
let textureOffset = 0;
for(let mapping of this._inputTextureUnitMapping ){
gl.activeTexture(mapping.textureUnit);
let textureLocation = gl.getUniformLocation(this._program, mapping.name);
gl.uniform1i(textureLocation, this._parameterTextureCount + textureOffset);
textureOffset += 1;
gl.bindTexture(gl.TEXTURE_2D, texture);
}
gl.drawArrays(gl.TRIANGLES, 0, 6);
});
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
}
}
export default CompositingNode;
</code></pre>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-VideoContext.html">VideoContext</a></li></ul><h3>Classes</h3><ul><li><a href="CanvasNode.html">CanvasNode</a></li><li><a href="CompositingNode.html">CompositingNode</a></li><li><a href="DestinationNode.html">DestinationNode</a></li><li><a href="EffectNode.html">EffectNode</a></li><li><a href="GraphNode.html">GraphNode</a></li><li><a href="ImageNode.html">ImageNode</a></li><li><a href="module-VideoContext.html">VideoContext</a></li><li><a href="ProcessingNode.html">ProcessingNode</a></li><li><a href="RenderGraph.html">RenderGraph</a></li><li><a href="SourceNode.html">SourceNode</a></li><li><a href="TransitionNode.html">TransitionNode</a></li><li><a href="VideoNode.html">VideoNode</a></li></ul>
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