Add make_current to libsimpleservo

ports/libsimpleservo/src/api.rs

@@ -39,6 +39,9 @@ pub trait HostTrait {
     /// Will be called from the thread used for the init call.
     /// Will be called when the GL buffer has been updated.
     fn flush(&self);
+    /// Will be called before drawing.
+    /// Time to make the targetted GL context current.
+    fn make_current(&self);
     /// Page starts loading.
     /// "Reload button" should be disabled.
     /// "Stop button" should be enabled.
@@ -353,6 +356,7 @@ impl WindowMethods for ServoCallbacks {
         _height: Length<u32, DevicePixel>,
     ) -> bool {
         debug!("WindowMethods::prepare_for_composite");
+        self.host_callbacks.make_current();
         true
     }
 

ports/libsimpleservo/src/capi.rs

@@ -28,6 +28,7 @@ fn call<F>(f: F) where F: Fn(&mut ServoGlue) -> Result<(), &'static str> {
 #[repr(C)]
 pub struct CHostCallbacks {
     pub flush: extern fn(),
+    pub make_current: extern fn(),
     pub on_load_started: extern fn(),
     pub on_load_ended: extern fn(),
     pub on_title_changed: extern fn(title: *const c_char),
@@ -223,6 +224,11 @@ impl HostTrait for HostCallbacks {
         (self.0.flush)();
     }
 
+    fn make_current(&self) {
+        debug!("make_current");
+        (self.0.make_current)();
+    }
+
     fn on_load_started(&self) {
         debug!("on_load_ended");
         (self.0.on_load_started)();

ports/libsimpleservo/src/jniapi.rs

@@ -277,6 +277,13 @@ impl HostTrait for HostCallbacks {
             .unwrap();
     }
 
+    fn make_current(&self) {
+        debug!("make_current");
+        let env = self.jvm.get_env().unwrap();
+        env.call_method(self.callbacks.as_obj(), "makeCurrent", "()V", &[])
+            .unwrap();
+    }
+
     fn on_load_started(&self) {
         debug!("on_load_started");
         let env = self.jvm.get_env().unwrap();