1 files changed, 21 insertions, 3 deletions
diff --git a/src/api/cocoa/mod.rs b/src/api/cocoa/mod.rs
index de24c2b..772b906 100644
--- a/src/api/cocoa/mod.rs
+++ b/src/api/cocoa/mod.rs
@@ -8,6 +8,7 @@ use libc;
 
 use Api;
 use BuilderAttribs;
+use ContextError;
 use GlContext;
 use GlProfile;
 use GlRequest;
@@ -354,6 +355,21 @@ impl Window {
         };
 
         unsafe {
+            if builder.transparent {
+                let clear_col = {
+                    let cls = Class::get("NSColor").unwrap();
+
+                    msg_send![cls, clearColor]
+                };
+                window.setOpaque_(NO);
+                window.setBackgroundColor_(clear_col);
+
+                let obj = context.CGLContextObj();
+
+                let mut opacity = 0;
+                CGLSetParameter(obj, kCGLCPSurfaceOpacity, &mut opacity);
+            }
+            
             app.activateIgnoringOtherApps_(YES);
             if builder.visible {
                 window.makeKeyAndOrderFront_(nil);
@@ -433,7 +449,7 @@ impl Window {
                 }
             };
 
-            let masks = if screen.is_some() {
+            let masks = if screen.is_some() || !builder.decorations {
                 NSBorderlessWindowMask as NSUInteger
             } else {
                 NSTitledWindowMask as NSUInteger |
@@ -758,9 +774,10 @@ impl Window {
 }
 
 impl GlContext for Window {
-    unsafe fn make_current(&self) {
+    unsafe fn make_current(&self) -> Result<(), ContextError> {
         let _: () = msg_send![*self.context, update];
         self.context.makeCurrentContext();
+        Ok(())
     }
 
     fn is_current(&self) -> bool {
@@ -787,8 +804,9 @@ impl GlContext for Window {
         symbol as *const _
     }
 
-    fn swap_buffers(&self) {
+    fn swap_buffers(&self) -> Result<(), ContextError> {
         unsafe { self.context.flushBuffer(); }
+        Ok(())
     }
 
     fn get_api(&self) -> ::Api {