Add is_current function

src/win32/headless.rs

@@ -20,6 +20,11 @@ impl HeadlessContext {
         self.0.make_current()
     }
 
+    /// See the docs in the crate root file.
+    pub fn is_current(&self) -> bool {
+        self.0.is_current()
+    }
+
     /// See the docs in the crate root file.
     pub fn get_proc_address(&self, addr: &str) -> *const () {
         self.0.get_proc_address(addr)

src/win32/mod.rs

@@ -208,6 +208,11 @@ impl Window {
                              self.context.0 as *const libc::c_void);
     }
 
+    /// See the docs in the crate root file.
+    pub fn is_current(&self) -> bool {
+        unsafe { gl::wgl::GetCurrentContext() == self.context.0 as *const libc::c_void }
+    }
+
     /// See the docs in the crate root file.
     pub fn get_proc_address(&self, addr: &str) -> *const () {
         let addr = CString::new(addr.as_bytes()).unwrap();