webgl-extensions detection. exposed like an object: Modernizr.webgl.O…

…ES_standard_derivatives

feature-detects/webgl-extensions.js

@@ -0,0 +1,32 @@
+
+
+// Grab the WebGL extensions currently supported and add to the Modernizr.webgl object
+// spec: www.khronos.org/registry/webgl/specs/latest/#5.13.14
+
+// based on code from ilmari heikkinen
+// code.google.com/p/graphics-detect/source/browse/js/detect.js
+
+
+(function(){
+
+    if (!Modernizr.webgl) return;
+
+    var canvas, ctx, exts;
+
+    try { 
+        canvas  = document.createElement('canvas'),
+        ctx     = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');
+        exts    = ctx.getSupportedExtensions();
+    }
+    catch (e) {
+        return;
+    }
+
+    Modernizr.webgl = new Boolean(true);
+
+    for (var i = -1, len = exts.length; ++i < len; ){
+        Modernizr.webgl[exts[i]] = true;    
+    }
+
+    canvas = undefined;;
+})();