Mojo multiple command buffer support and sample

mojo/services/native_viewport/native_viewport_service.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/services/native_viewport/native_viewport_service.h"
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
+#include "gpu/command_buffer/service/mailbox_manager.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/interface_factory.h"
 #include "mojo/services/gles2/command_buffer_impl.h"
 #include "mojo/services/native_viewport/native_viewport.h"
 #include "mojo/services/public/cpp/geometry/geometry_type_converters.h"
 #include "mojo/services/public/cpp/input_events/input_events_type_converters.h"
 #include "mojo/services/public/interfaces/native_viewport/native_viewport.mojom.h"
 #include "ui/events/event.h"
+#include "ui/gl/gl_share_group.h"
 
 namespace mojo {
 namespace services {
 namespace {
 
 bool IsRateLimitedEventType(ui::Event* event) {
   return event->type() == ui::ET_MOUSE_MOVED ||
          event->type() == ui::ET_MOUSE_DRAGGED ||
          event->type() == ui::ET_TOUCH_MOVED;
 }
 
 }  // namespace
 
 class NativeViewportImpl : public InterfaceImpl<mojo::NativeViewport>,
                            public NativeViewportDelegate {
  public:
-  NativeViewportImpl()
+  NativeViewportImpl(
+      const scoped_refptr<gfx::GLShareGroup>& share_group,
+      const scoped_refptr<gpu::gles2::MailboxManager>& mailbox_manager)
       : widget_(gfx::kNullAcceleratedWidget),
         waiting_for_event_ack_(false),
+        share_group_(share_group),
+        mailbox_manager_(mailbox_manager),
         weak_factory_(this) {}
   virtual ~NativeViewportImpl() {
     // Destroy the NativeViewport early on as it may call us back during
     // destruction and we want to be in a known state.
     native_viewport_.reset();
   }
 
   virtual void Create(RectPtr bounds) OVERRIDE {
     native_viewport_ = services::NativeViewport::Create(this);
     native_viewport_->Init(bounds.To<gfx::Rect>());
@@ skipping 22 matching lines @@
   virtual void CreateGLES2Context(
       InterfaceRequest<CommandBuffer> command_buffer_request) OVERRIDE {
     if (command_buffer_ || command_buffer_request_.is_pending()) {
       LOG(ERROR) << "Can't create multiple contexts on a NativeViewport";
       return;
     }
     command_buffer_request_ = command_buffer_request.Pass();
     CreateCommandBufferIfNeeded();
   }
 
+  virtual void CreateOffscreenGLES2Context(
+      InterfaceRequest<CommandBuffer> command_buffer_request) OVERRIDE {
+    BindToRequest(
+        new CommandBufferImpl(share_group_.get(), mailbox_manager_.get()),
+        &command_buffer_request);
+  }
+
   void AckEvent() {
     waiting_for_event_ack_ = false;
   }
 
   void CreateCommandBufferIfNeeded() {
     if (!command_buffer_request_.is_pending())
       return;
     DCHECK(!command_buffer_.get());
     if (widget_ == gfx::kNullAcceleratedWidget)
       return;
     gfx::Size size = native_viewport_->GetSize();
     if (size.IsEmpty())
       return;
-    command_buffer_.reset(
-        new CommandBufferImpl(widget_, native_viewport_->GetSize()));
+    command_buffer_.reset(new CommandBufferImpl(widget_,
+                                                native_viewport_->GetSize(),
+                                                share_group_.get(),
+                                                mailbox_manager_.get()));
     WeakBindToRequest(command_buffer_.get(), &command_buffer_request_);
   }
 
   virtual bool OnEvent(ui::Event* ui_event) OVERRIDE {
     // Must not return early before updating capture.
     switch (ui_event->type()) {
       case ui::ET_MOUSE_PRESSED:
       case ui::ET_TOUCH_PRESSED:
         native_viewport_->SetCapture();
         break;
@@ skipping 35 matching lines @@
  private:
   void AckDestroyed() {
     command_buffer_.reset();
   }
 
   gfx::AcceleratedWidget widget_;
   scoped_ptr<services::NativeViewport> native_viewport_;
   InterfaceRequest<CommandBuffer> command_buffer_request_;
   scoped_ptr<CommandBufferImpl> command_buffer_;
   bool waiting_for_event_ack_;
+  scoped_refptr<gfx::GLShareGroup> share_group_;
+  scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
   base::WeakPtrFactory<NativeViewportImpl> weak_factory_;
 };
 
 class NVSDelegate : public ApplicationDelegate,
                     public InterfaceFactory<mojo::NativeViewport> {
  public:
-  NVSDelegate() {}
+  NVSDelegate()
+      : share_group_(new gfx::GLShareGroup),
+        mailbox_manager_(new gpu::gles2::MailboxManager) {}
   virtual ~NVSDelegate() {}
 
   // ApplicationDelegate implementation.
   virtual bool ConfigureIncomingConnection(
       mojo::ApplicationConnection* connection) OVERRIDE {
     connection->AddService(this);
     return true;
   }
 
   // ServiceFactory<mojo::NativeViewport> implementation.
   virtual void Create(ApplicationConnection* connection,
                       InterfaceRequest<mojo::NativeViewport> request) OVERRIDE {
-    BindToRequest(new NativeViewportImpl, &request);
+    BindToRequest(
+        new NativeViewportImpl(share_group_.get(), mailbox_manager_.get()),
+        &request);
   }
+
+ private:
+  // We need to share these across all NativeViewport instances so that contexts
+  // they create can share resources with each other via mailboxes.
+  scoped_refptr<gfx::GLShareGroup> share_group_;
+  scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
 };
 
 MOJO_NATIVE_VIEWPORT_EXPORT mojo::ApplicationImpl*
     CreateNativeViewportService(
         ScopedMessagePipeHandle service_provider_handle) {
   ApplicationImpl* app = new ApplicationImpl(
       new NVSDelegate(), service_provider_handle.Pass());
   return app;
 }
 
 }  // namespace services
 }  // namespace mojo