1 files changed, 22 insertions, 18 deletions
diff --git a/src/proxyWorker.js b/src/proxyWorker.js
index cfe0c26e..225b4493 100644
--- a/src/proxyWorker.js
+++ b/src/proxyWorker.js
@@ -43,24 +43,28 @@ document.createElement = function document_createElement(what) {
         }
       };
       canvas.getContext = function canvas_getContext(type) {
-        assert(type == '2d');
-        return {
-          getImageData: function(x, y, w, h) {
-            assert(x == 0 && y == 0 && w == canvas.width && h == canvas.height);
-            canvas.ensureData();
-            return {
-              width: canvas.data.width,
-              height: canvas.data.height,
-              data: new Uint8Array(canvas.data.data) // TODO: can we avoid this copy?
-            };
-          },
-          putImageData: function(image, x, y) {
-            canvas.ensureData();
-            assert(x == 0 && y == 0 && image.width == canvas.width && image.height == canvas.height);
-            canvas.data.data.set(image.data); // TODO: can we avoid this copy?
-            postMessage({ target: 'canvas', op: 'render', image: canvas.data });
-          }
-        };
+        postMessage({ target: 'canvas', op: 'getContext', type: type });
+        if (type === '2d') {
+          return {
+            getImageData: function(x, y, w, h) {
+              assert(x == 0 && y == 0 && w == canvas.width && h == canvas.height);
+              canvas.ensureData();
+              return {
+                width: canvas.data.width,
+                height: canvas.data.height,
+                data: new Uint8Array(canvas.data.data) // TODO: can we avoid this copy?
+              };
+            },
+            putImageData: function(image, x, y) {
+              canvas.ensureData();
+              assert(x == 0 && y == 0 && image.width == canvas.width && image.height == canvas.height);
+              canvas.data.data.set(image.data); // TODO: can we avoid this copy?
+              postMessage({ target: 'canvas', op: 'render', image: canvas.data });
+            }
+          };
+        } else {
+          return new WebGLWorker();
+        }
       };
       canvas.boundingClientRect = {};
       canvas.getBoundingClientRect = function canvas_getBoundingClientRect() {