Request context sharing via content::ContextProviderCommandBuffer

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 #define CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/client/command_buffer_metrics.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/ipc/client/command_buffer_proxy_impl.h"
 #include "gpu/ipc/common/surface_handle.h"
 #include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "ui/gl/gpu_preference.h"
 #include "url/gurl.h"
 
 namespace gpu {
 
 class ContextSupport;
 class GpuChannelHost;
 struct SharedMemoryLimits;
 class TransferBuffer;
 
 namespace gles2 {
 class GLES2CmdHelper;
 class GLES2Implementation;
 class GLES2Interface;
+class ShareGroup;
 }
 }
 
 namespace content {
 
 class WebGraphicsContext3DCommandBufferImpl
     : public NON_EXPORTED_BASE(blink::WebGraphicsContext3D) {
  public:
   enum MappedMemoryReclaimLimit {
     kNoLimit = 0,
   };
 
-  class ShareGroup : public base::RefCountedThreadSafe<ShareGroup> {
-   public:
-    ShareGroup();
-
-    WebGraphicsContext3DCommandBufferImpl* GetAnyContextLocked() {
-      // In order to ensure that the context returned is not removed while
-      // in use, the share group's lock should be aquired before calling this
-      // function.
-      lock_.AssertAcquired();
-      if (contexts_.empty())
-        return NULL;
-      return contexts_.front();
-    }
-
-    void AddContextLocked(WebGraphicsContext3DCommandBufferImpl* context) {
-      lock_.AssertAcquired();
-      contexts_.push_back(context);
-    }
-
-    void RemoveContext(WebGraphicsContext3DCommandBufferImpl* context) {
-      base::AutoLock auto_lock(lock_);
-      contexts_.erase(std::remove(contexts_.begin(), contexts_.end(), context),
-          contexts_.end());
-    }
-
-    void RemoveAllContexts() {
-      base::AutoLock auto_lock(lock_);
-      contexts_.clear();
-    }
-
-    base::Lock& lock() {
-      return lock_;
-    }
-
-   private:
-    friend class base::RefCountedThreadSafe<ShareGroup>;
-    virtual ~ShareGroup();
-
-    std::vector<WebGraphicsContext3DCommandBufferImpl*> contexts_;
-    base::Lock lock_;
-
-    DISALLOW_COPY_AND_ASSIGN(ShareGroup);
-  };
-
   class WebGraphicsContextLostCallback {
    public:
     virtual void onContextLost() = 0;
 
    protected:
     virtual ~WebGraphicsContextLostCallback() {}
   };
 
   // If surface_handle is not kNullSurfaceHandle, this creates a
   // CommandBufferProxy that renders directly to a view. The view and
   // the associated window must not be destroyed until the returned
   // CommandBufferProxy has been destroyed, otherwise the GPU process might
   // attempt to render to an invalid window handle.
   CONTENT_EXPORT WebGraphicsContext3DCommandBufferImpl(
       gpu::SurfaceHandle surface_handle,
       const GURL& active_url,
       gpu::GpuChannelHost* host,
       const gpu::gles2::ContextCreationAttribHelper& attributes,
       gfx::GpuPreference gpu_preference,
-      bool share_resources,
-      bool automatic_flushes,
-      WebGraphicsContext3DCommandBufferImpl* share_context);
+      bool automatic_flushes);
 
   ~WebGraphicsContext3DCommandBufferImpl() override;
 
   gpu::CommandBufferProxyImpl* GetCommandBufferProxy() {
     return command_buffer_.get();
   }
 
   CONTENT_EXPORT gpu::ContextSupport* GetContextSupport();
 
   gpu::gles2::GLES2Implementation* GetImplementation() {
     return real_gl_.get();
   }
 
   void SetContextLostCallback(WebGraphicsContextLostCallback* callback) {
     context_lost_callback_ = callback;
   }
 
   CONTENT_EXPORT bool InitializeOnCurrentThread(
-      const gpu::SharedMemoryLimits& memory_limits);
+      const gpu::SharedMemoryLimits& memory_limits,
+      gpu::CommandBufferProxyImpl* shared_command_buffer,
+      scoped_refptr<gpu::gles2::ShareGroup> share_group);
 
   void SetContextType(CommandBufferContextType type) {
     context_type_ = type;
   }
  private:
   // These are the same error codes as used by EGL.
   enum Error {
     SUCCESS               = 0x3000,
     BAD_ATTRIBUTE         = 0x3004,
     CONTEXT_LOST          = 0x300E
   };
 
   // Initialize the underlying GL context. May be called multiple times; second
   // and subsequent calls are ignored. Must be called from the thread that is
   // going to use this object to issue GL commands (which might not be the main
   // thread).
-  bool MaybeInitializeGL(const gpu::SharedMemoryLimits& memory_limits);
+  bool MaybeInitializeGL(const gpu::SharedMemoryLimits& memory_limits,
+                         gpu::CommandBufferProxyImpl* shared_command_buffer,
+                         scoped_refptr<gpu::gles2::ShareGroup> share_group);
 
   bool InitializeCommandBuffer(
-      WebGraphicsContext3DCommandBufferImpl* share_context);
+      gpu::CommandBufferProxyImpl* shared_command_buffer);
 
   void Destroy();
 
-  bool CreateContext(const gpu::SharedMemoryLimits& memory_limits);
+  bool CreateContext(const gpu::SharedMemoryLimits& memory_limits,
+                     gpu::CommandBufferProxyImpl* shared_command_buffer,
+                     scoped_refptr<gpu::gles2::ShareGroup> share_group);
 
   void OnContextLost();
 
   bool initialized_ = false;
   bool initialize_failed_ = false;
   WebGraphicsContextLostCallback* context_lost_callback_ = nullptr;
 
   bool automatic_flushes_;
   gpu::gles2::ContextCreationAttribHelper attributes_;
 
   // State needed by MaybeInitializeGL.
   scoped_refptr<gpu::GpuChannelHost> host_;
   gpu::SurfaceHandle surface_handle_;
   GURL active_url_;
   CommandBufferContextType context_type_;
 
   gfx::GpuPreference gpu_preference_;
 
   std::unique_ptr<gpu::CommandBufferProxyImpl> command_buffer_;
   std::unique_ptr<gpu::gles2::GLES2CmdHelper> gles2_helper_;
   std::unique_ptr<gpu::TransferBuffer> transfer_buffer_;
   std::unique_ptr<gpu::gles2::GLES2Implementation> real_gl_;
   std::unique_ptr<gpu::gles2::GLES2Interface> trace_gl_;
-  scoped_refptr<ShareGroup> share_group_;
 
   // Member variables should appear before the WeakPtrFactory, to ensure
   // that any WeakPtrs to Controller are invalidated before its members
   // variable's destructors are executed, rendering them invalid.
   base::WeakPtrFactory<WebGraphicsContext3DCommandBufferImpl> weak_ptr_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_