Pass GLPlayerThreads to constellation

Create the thread only if the GL context is known.

components/canvas_traits/media.rs

@@ -66,6 +66,8 @@ pub struct WindowGLContext {
     pub gl_api: GlApi,
     /// Application's native display
     pub native_display: NativeDisplay,
+    /// A channel to the GLPlayer thread.
+    pub glplayer_chan: Option<GLPlayerPipeline>,
 }
 
 impl PlayerGLContext for WindowGLContext {

components/constellation/constellation.rs

@@ -104,6 +104,7 @@ use background_hang_monitor::HangMonitorRegister;
 use backtrace::Backtrace;
 use bluetooth_traits::BluetoothRequest;
 use canvas::canvas_paint_thread::CanvasPaintThread;
+use canvas::media_thread::GLPlayerThreads;
 use canvas::webgl_thread::WebGLThreads;
 use canvas_traits::canvas::CanvasId;
 use canvas_traits::canvas::CanvasMsg;
@@ -411,6 +412,9 @@ pub struct Constellation<Message, LTF, STF> {
     /// results are required.
     enable_canvas_antialiasing: bool,
 
+    /// Entry point to create and get channels to a GLPlayerThread.
+    glplayer_threads: Option<GLPlayerThreads>,
+
     /// Application window's GL Context for Media player
     player_context: WindowGLContext,
 }
@@ -461,6 +465,8 @@ pub struct InitialConstellationState {
 
     /// The XR device registry
     pub webxr_registry: webxr_api::Registry,
+    
+    pub glplayer_threads: Option<GLPlayerThreads>,
 
     /// Application window's GL Context for Media player
     pub player_context: WindowGLContext,
@@ -760,6 +766,7 @@ where
                     is_running_problem_test,
                     hard_fail,
                     enable_canvas_antialiasing,
+                    glplayer_threads: state.glplayer_threads,
                     player_context: state.player_context,
                 };
 
@@ -1804,6 +1811,13 @@ where
             }
         }
 
+        debug!("Exiting GLPlayer thread.");
+        if let Some(glplayer_threads) = self.glplayer_threads.as_ref() {
+            if let Err(e) = glplayer_threads.exit() {
+                warn!("Exit GLPlayer Thread failed ({})", e);
+            }
+        }
+
         debug!("Exiting timer scheduler.");
         if let Err(e) = self.scheduler_chan.send(TimerSchedulerMsg::Exit) {
             warn!("Exit timer scheduler failed ({})", e);

components/servo/lib.rs

@@ -63,6 +63,7 @@ fn webdriver(_port: u16, _constellation: Sender<ConstellationMsg>) {}
 use bluetooth::BluetoothThreadFactory;
 use bluetooth_traits::BluetoothRequest;
 use canvas::gl_context::GLContextFactory;
+use canvas::media_thread::GLPlayerThreads;
 use canvas::webgl_thread::WebGLThreads;
 use canvas_traits::media::WindowGLContext;
 use compositing::compositor_thread::{
@@ -104,6 +105,7 @@ use profile_traits::time;
 use script_traits::{ConstellationMsg, SWManagerSenders, ScriptToConstellationChan};
 use servo_config::opts;
 use servo_config::{pref, prefs};
+use servo_media::player::context::GlContext;
 use servo_media::ServoMedia;
 use std::borrow::Cow;
 use std::cmp::max;
@@ -304,10 +306,16 @@ where
             None
         };
 
+        let gl_context = window.get_gl_context();
+        let glplayer_threads = match gl_context {
+            GlContext::Unknown => None,
+            _ => Some(GLPlayerThreads::new()),
+        };
         let player_context = WindowGLContext {
-            gl_context: window.get_gl_context(),
+            gl_context,
             native_display: window.get_native_display(),
             gl_api: window.get_gl_api(),
+            glplayer_chan: glplayer_threads.as_ref().map(|threads| threads.pipeline()),
         };
 
         // Create the constellation, which maintains the engine
@@ -328,6 +336,7 @@ where
             window.gl(),
             webvr_services,
             webxr_registry,
+            glplayer_threads,
             player_context,
         );
 
@@ -639,6 +648,7 @@ fn create_constellation(
     window_gl: Rc<dyn gl::Gl>,
     webvr_services: Option<VRServiceManager>,
     webxr_registry: webxr_api::Registry,
+    glplayer_threads: Option<GLPlayerThreads>,
     player_context: WindowGLContext,
 ) -> (Sender<ConstellationMsg>, SWManagerSenders) {
     // Global configuration options, parsed from the command line.
@@ -721,6 +731,7 @@ fn create_constellation(
         webgl_threads,
         webvr_chan,
         webxr_registry,
+        glplayer_threads,
         player_context,
     };
     let (constellation_chan, from_swmanager_sender) = Constellation::<