Fix canvas.toDataURL yielding blank image.

Added `preserveDrawingBuffer` as option to getContext for webgl. Tested in Chrome and IE11
qazbob · Jan 6, 2017 · 3c11c24 · 3c11c24
1 parent bff737b
commit 3c11c24
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/jsmpg.js b/jsmpg.js
@@ -928,7 +928,8 @@ jsmpeg.prototype.initWebGL = function() {
 
 	// attempt to get a webgl context
 	try {
-		gl = this.gl = this.canvas.getContext('webgl') || this.canvas.getContext('experimental-webgl');
+		var options = { preserveDrawingBuffer: true };
+		gl = this.gl = this.canvas.getContext('webgl', options) || this.canvas.getContext('experimental-webgl', options);
 	} catch (e) {
 		return false;
 	}