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webgl-read-pixels-async

v0.0.3

Published

Allows to read pixels from webgl2 context asynchronously

Downloads

28

Readme

webgl-read-pixels-async

Context

By default, read pixels is syncronous, which means when you sending readPixels command you can't do anything else until it's done. In performance critical applications, this can be a problem. This library allows to read pixels asynchronously, so you can do other things while waiting for pixels to be read.

Basically, this is an implementations from MDN's example of reading pixels from webgl2 context asynchronously

Installation

npm install webgl-read-pixels-async

Usage

const {readPixelsAsync} from 'webgl-read-pixels-async';

const gl = canvas.getContext('webgl2');
const width = canvas.width;
const height = canvas.height;
const pixels = new Uint8Array(width * height * 4);

readPixelsAsync(gl, 0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, pixels)
  .then(() => {
    // do something with pixels
  });