From 6bdfff91c01408616bb4715b0995a097d1b049e9 Mon Sep 17 00:00:00 2001
From: Stefan Radomski <radomski@tk.informatik.tu-darmstadt.de>
Date: Mon, 11 Nov 2013 20:57:04 +0100
Subject: Check for WebGL

---
 apps/samples/vrml/viewer-webgl.js | 25 +++++++++++++++++++++++++
 apps/samples/vrml/viewer.html     |  6 +++---
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/apps/samples/vrml/viewer-webgl.js b/apps/samples/vrml/viewer-webgl.js
index 5f8a4e8..5cec6e6 100644
--- a/apps/samples/vrml/viewer-webgl.js
+++ b/apps/samples/vrml/viewer-webgl.js
@@ -55,6 +55,31 @@ function VRMLViewer(element, params) {
     }
   }
   
+  var hasWebGL = function() {
+    try {
+      if (!window.WebGLRenderingContext) {
+         return false;
+      }
+      var canvas = document.createElement("canvas");
+      var names = ["webgl", "experimental-webgl", "moz-webgl", "webkit-3d"];
+      for (var i = 0; i < 4; i++) {
+        var gl = canvas.getContext(names[i]);
+        if (gl) {
+          return true;
+        }
+      }
+    } catch(e) {
+      return false;
+    }
+    return false;
+  }
+  
+  if (self.enableWebGL && !hasWebGL()) {
+    console.log("Your browser does no support WebGL, falling back to sceneshots");
+    self.enableWebGL = false;
+    self.enableSceneshots = true;
+  }
+  
   // normalize parameters
   var normalizeParams = function() {
     // make sure server url begins with protocol and does *not* ends in /
diff --git a/apps/samples/vrml/viewer.html b/apps/samples/vrml/viewer.html
index 7357ee4..873da0e 100644
--- a/apps/samples/vrml/viewer.html
+++ b/apps/samples/vrml/viewer.html
@@ -75,9 +75,9 @@
 					},
 					enableMovies: false,
 					enableDND: false,
-					enableWebGL: false,
-					enableSceneshots: true,
-					enableDraggables: true,
+					enableWebGL: true,
+					enableSceneshots: false,
+					enableDraggables: false,
 					listNavigationStyle: true,
 					treeNavigationStyle: true,
 					listDirectory: "/hard_mp",
-- 
cgit v0.12