egl Display::create_sync

glutin/src/api/egl/display.rs

@@ -231,6 +231,36 @@ impl Display {
         }
     }
 
+    /// Create a sync.
+    ///
+    /// This function returns [`Err`] if the EGL version is not at least 1.5
+    /// or `EGL_KHR_fence_sync` is not available. An error is also returned if
+    /// native fences are not supported.
+    pub fn create_sync(&self, native: bool) -> Result<super::sync::Sync> {
+        if self.inner.version < super::VERSION_1_5
+            && !self.inner.display_extensions.contains("EGL_KHR_fence_sync")
+        {
+            return Err(ErrorKind::NotSupported("Sync objects are not supported").into());
+        }
+
+        if native && !self.inner.display_extensions.contains("EGL_ANDROID_native_fence_sync") {
+            return Err(ErrorKind::NotSupported("Native fences are not supported").into());
+        }
+
+        let ty = if native { egl::SYNC_NATIVE_FENCE_ANDROID } else { egl::SYNC_FENCE_KHR };
+
+        let sync = unsafe { self.inner.egl.CreateSyncKHR(*self.inner.raw, ty, ptr::null_mut()) };
+
+        if sync == egl::NO_SYNC {
+            return Err(super::check_error().err().unwrap());
+        }
+
+        Ok(super::sync::Sync(Arc::new(super::sync::Inner {
+            inner: sync,
+            display: self.inner.clone(),
+        })))
+    }
+
     /// Import a sync fd into EGL.
     ///
     /// Glutin will duplicate the sync fd being imported since EGL assumes