HTMLCanvasElement: webglcontextrestored event

The webglcontextrestored event of the WebGL API is fired if the user agent restores the drawing buffer for a WebGLRenderingContext object.

Once the context is restored, WebGL resources such as textures and buffers that were created before the context was lost are no longer valid. You need to reinitialize the state of your WebGL application and recreate resources.

With the help of the WEBGL_lose_context extension, you can simulate the webglcontextrestored event:

var canvas = document.getElementById('canvas');
var gl = canvas.getContext('webgl');

canvas.addEventListener('webglcontextrestored', function(e) {
  console.log(e);
}, false);

gl.getExtension('WEBGL_lose_context').restoreContext();

// "webglcontextrestored" event is logged.

• WebGLContextEvent
• WebGLRenderingContext.isContextLost()
• WEBGL_lose_context, WEBGL_lose_context.loseContext(), WEBGL_lose_context.restoreContext()