Merge branch 'TurboWarp:develop' into develop

Author: CubesterYT

src/RenderConstants.js

@@ -32,6 +32,13 @@ module.exports = {
          * @type {object}
          * @property {Array<int>} newSize - the new size of the renderer
          */
-        NativeSizeChanged: 'NativeSizeChanged'
+        NativeSizeChanged: 'NativeSizeChanged',
+
+        /**
+         * Event emitted when the WebGL context is lost.
+         *
+         * @event RenderWebGL#event:ContextLost
+         */
+        ContextLost: 'ContextLost'
     }
 };

src/RenderWebGL.js

@@ -292,6 +292,10 @@ class RenderWebGL extends EventEmitter {
 
         this.on(RenderConstants.Events.NativeSizeChanged, this.onNativeSizeChanged);
 
+        gl.canvas.addEventListener('webglcontextlost', () => {
+            this.emit(RenderConstants.Events.ContextLost);
+        });
+
         this.setBackgroundColor(1, 1, 1);
         this.setStageSize(xLeft || -240, xRight || 240, yBottom || -180, yTop || 180);
         this.resize(this._nativeSize[0], this._nativeSize[1]);