Fixed custom environment logic

Author: photonstorm

src/boot/CreateRenderer.js

@@ -23,10 +23,13 @@ var CreateRenderer = function (game)
 {
     var config = game.config;
 
-    //  Game either requested Canvas,
-    //  or requested AUTO or WEBGL but the browser doesn't support it, so fall back to Canvas
+    if ((config.customEnvironment || config.canvas) && config.renderType === CONST.AUTO)
+    {
+        throw new Error('Must set explicit renderType in custom environment');
+    }
 
-    if ((config.customEnvironment || config.canvas) && config.renderType !== CONST.HEADLESS)
+    //  Not a custom environment, didn't provide their own canvas and not headless, so determine the renderer:
+    if (!config.customEnvironment && !config.canvas && config.renderType !== CONST.HEADLESS)
     {
         if (config.renderType === CONST.CANVAS || (config.renderType !== CONST.CANVAS && !Features.webGL))
         {
@@ -47,11 +50,6 @@ var CreateRenderer = function (game)
         }
     }
 
-    if (config.customEnvironment && config.renderType === CONST.AUTO)
-    {
-        throw new Error('Must set renderType in custom environment');
-    }
-
     //  Pixel Art mode?
     if (!config.antialias)
     {