Merge remote-tracking branch 'jeromeetienne/master' into dev

src/renderers/WebGLRenderer.js

@@ -75,6 +75,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 	_canvas = parameters.canvas !== undefined ? parameters.canvas : document.createElement( 'canvas' ),
 	_stencil = parameters.stencil !== undefined ? parameters.stencil : true,
+	_preserveDrawingBuffer = parameters.preserveDrawingBuffer !== undefined ? parameters.preserveDrawingBuffer : false,
 	_antialias = parameters.antialias !== undefined ? parameters.antialias : false,
 	_clearColor = parameters.clearColor !== undefined ? new THREE.Color( parameters.clearColor ) : new THREE.Color( 0x000000 ),
 	_clearAlpha = parameters.clearAlpha !== undefined ? parameters.clearAlpha : 0;
@@ -130,7 +131,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 	try {
 
-		if ( ! ( _gl = _canvas.getContext( 'experimental-webgl', { antialias: _antialias, stencil: _stencil } ) ) ) {
+		if ( ! ( _gl = _canvas.getContext( 'experimental-webgl', { antialias: _antialias, stencil: _stencil, preserveDrawingBuffer: _preserveDrawingBuffer } ) ) ) {
 
 			throw 'Error creating WebGL context.';