Handle errors from MakeCurrent and SwapBuffers

src/platform/windows/mod.rs

@@ -6,6 +6,7 @@ use libc;
 
 use Api;
 use BuilderAttribs;
+use ContextError;
 use CreationError;
 use PixelFormat;
 use GlContext;
@@ -21,7 +22,7 @@ impl HeadlessContext {
 }
 
 impl GlContext for HeadlessContext {
-    unsafe fn make_current(&self) {
+    unsafe fn make_current(&self) -> Result<(), ContextError> {
         self.0.make_current()
     }
 
@@ -33,7 +34,7 @@ impl GlContext for HeadlessContext {
         self.0.get_proc_address(addr)
     }
 
-    fn swap_buffers(&self) {
+    fn swap_buffers(&self) -> Result<(), ContextError> {
         self.0.swap_buffers()
     }