diff --git a/lib/x11/ext/glx.js b/lib/x11/ext/glx.js
index bfe4df7..c9b1869 100644
--- a/lib/x11/ext/glx.js
+++ b/lib/x11/ext/glx.js
@@ -169,9 +169,18 @@ exports.requireExt = function(display, callback)
             X.pack_stream.flush();
         }
 
-        // glClearColor ( 0, 0.5, 1, 1 ); glClear ( GL_COLOR_BUFFER_BIT );
-        // xtrace: render commands={command=ClearColor(0x0082) unknown=0x00,0x00,0x80,0x3f,0x00,0x00,0x00,0x3f,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x3f;},{command=Clear(0x007f) mask=0x00004000 };
-        // (context 0300 4004) (1400 8200 0000 803f 0000 003f 0000 0000 0000 803f) (0800 7f00 0040 0000)
+        ext.Finish = function(ctx, callback)
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSL', [ext.majorOpcode, 108, 2, ctx]);
+            X.replies[X.seq_num] = [
+                function(buf, opt) {
+                    return;
+                },
+                callback
+            ];
+            X.pack_stream.flush();
+        }
 
         ext.Render = function(ctx, data) {
             X.seq_num++;
@@ -196,8 +205,8 @@ exports.requireExt = function(display, callback)
             X.pack_stream.flush();
         }
 
-        ext.renderPipeline = function() {
-            return require('./glxrender')(this);
+        ext.renderPipeline = function(ctx) {
+            return require('./glxrender')(this, ctx);
         }
 
         callback(ext);