content/common/gpu/client/gpu_channel_host.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_COMMON_GPU_CLIENT_GPU_CHANNEL_HOST_H_
   6 #define CONTENT_COMMON_GPU_CLIENT_GPU_CHANNEL_HOST_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/atomic_sequence_num.h"
  12 #include "base/containers/hash_tables.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "base/process/process.h"
  17 #include "base/synchronization/lock.h"
  18 #include "content/common/content_export.h"
  19 #include "content/common/gpu/gpu_process_launch_causes.h"
  20 #include "content/common/gpu/gpu_result_codes.h"
  21 #include "content/common/message_router.h"
  22 #include "gpu/config/gpu_info.h"
  23 #include "ipc/ipc_channel_handle.h"
  24 #include "ipc/ipc_sync_channel.h"
  25 #include "ipc/message_filter.h"
  26 #include "ui/gfx/gpu_memory_buffer.h"
  27 #include "ui/gfx/native_widget_types.h"
  28 #include "ui/gfx/size.h"
  29 #include "ui/gl/gpu_preference.h"
  30
  31 class GURL;
  32 class TransportTextureService;
  33 struct GPUCreateCommandBufferConfig;
  34
  35 namespace base {
  36 class MessageLoop;
  37 class MessageLoopProxy;
  38 class WaitableEvent;
  39 }
  40
  41 namespace IPC {
  42 class SyncMessageFilter;
  43 }
  44
  45 namespace media {
  46 class VideoDecodeAccelerator;
  47 class VideoEncodeAccelerator;
  48 }
  49
  50 namespace content {
  51 class CommandBufferProxyImpl;
  52 class GpuChannelHost;
  53
  54 struct GpuListenerInfo {
  55   GpuListenerInfo();
  56   ~GpuListenerInfo();
  57
  58   base::WeakPtr<IPC::Listener> listener;
  59   scoped_refptr<base::MessageLoopProxy> loop;
  60 };
  61
  62 class CONTENT_EXPORT GpuChannelHostFactory {
  63  public:
  64   virtual ~GpuChannelHostFactory() {}
  65
  66   virtual bool IsMainThread() = 0;
  67   virtual base::MessageLoop* GetMainLoop() = 0;
  68   virtual scoped_refptr<base::MessageLoopProxy> GetIOLoopProxy() = 0;
  69   virtual scoped_ptr<base::SharedMemory> AllocateSharedMemory(size_t size) = 0;
  70   virtual CreateCommandBufferResult CreateViewCommandBuffer(
  71       int32 surface_id,
  72       const GPUCreateCommandBufferConfig& init_params,
  73       int32 route_id) = 0;
  74   virtual scoped_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
  75       size_t width,
  76       size_t height,
  77       unsigned internalformat,
  78       unsigned usage) = 0;
  79   virtual void DeleteGpuMemoryBuffer(
  80       scoped_ptr<gfx::GpuMemoryBuffer> buffer) = 0;
  81 };
  82
  83 // Encapsulates an IPC channel between the client and one GPU process.
  84 // On the GPU process side there's a corresponding GpuChannel.
  85 // Every method can be called on any thread with a message loop, except for the
  86 // IO thread.
  87 class GpuChannelHost : public IPC::Sender,
  88                        public base::RefCountedThreadSafe<GpuChannelHost> {
  89  public:
  90   // Must be called on the main thread (as defined by the factory).
  91   static scoped_refptr<GpuChannelHost> Create(
  92       GpuChannelHostFactory* factory,
  93       const gpu::GPUInfo& gpu_info,
  94       const IPC::ChannelHandle& channel_handle,
  95       base::WaitableEvent* shutdown_event);
  96
  97   // Returns true if |handle| is a valid GpuMemoryBuffer handle that
  98   // can be shared to the GPU process.
  99   static bool IsValidGpuMemoryBuffer(gfx::GpuMemoryBufferHandle handle);
 100
 101   bool IsLost() const {
 102     DCHECK(channel_filter_.get());
 103     return channel_filter_->IsLost();
 104   }
 105
 106   // The GPU stats reported by the GPU process.
 107   const gpu::GPUInfo& gpu_info() const { return gpu_info_; }
 108
 109   // IPC::Sender implementation:
 110   virtual bool Send(IPC::Message* msg) OVERRIDE;
 111
 112   // Create and connect to a command buffer in the GPU process.
 113   CommandBufferProxyImpl* CreateViewCommandBuffer(
 114       int32 surface_id,
 115       CommandBufferProxyImpl* share_group,
 116       const std::vector<int32>& attribs,
 117       const GURL& active_url,
 118       gfx::GpuPreference gpu_preference);
 119
 120   // Create and connect to a command buffer in the GPU process.
 121   CommandBufferProxyImpl* CreateOffscreenCommandBuffer(
 122       const gfx::Size& size,
 123       CommandBufferProxyImpl* share_group,
 124       const std::vector<int32>& attribs,
 125       const GURL& active_url,
 126       gfx::GpuPreference gpu_preference);
 127
 128   // Creates a video decoder in the GPU process.
 129   scoped_ptr<media::VideoDecodeAccelerator> CreateVideoDecoder(
 130       int command_buffer_route_id);
 131
 132   // Creates a video encoder in the GPU process.
 133   scoped_ptr<media::VideoEncodeAccelerator> CreateVideoEncoder(
 134       int command_buffer_route_id);
 135
 136   // Destroy a command buffer created by this channel.
 137   void DestroyCommandBuffer(CommandBufferProxyImpl* command_buffer);
 138
 139   // Add a route for the current message loop.
 140   void AddRoute(int route_id, base::WeakPtr<IPC::Listener> listener);
 141   void RemoveRoute(int route_id);
 142
 143   GpuChannelHostFactory* factory() const { return factory_; }
 144
 145   // Returns a handle to the shared memory that can be sent via IPC to the
 146   // GPU process. The caller is responsible for ensuring it is closed. Returns
 147   // an invalid handle on failure.
 148   base::SharedMemoryHandle ShareToGpuProcess(
 149       base::SharedMemoryHandle source_handle);
 150
 151   // Reserve one unused transfer buffer ID.
 152   int32 ReserveTransferBufferId();
 153
 154   // Returns a GPU memory buffer handle to the buffer that can be sent via
 155   // IPC to the GPU process. The caller is responsible for ensuring it is
 156   // closed. Returns an invalid handle on failure.
 157   gfx::GpuMemoryBufferHandle ShareGpuMemoryBufferToGpuProcess(
 158       gfx::GpuMemoryBufferHandle source_handle);
 159
 160   // Reserve one unused gpu memory buffer ID.
 161   int32 ReserveGpuMemoryBufferId();
 162
 163   // Generate a route ID guaranteed to be unique for this channel.
 164   int32 GenerateRouteID();
 165
 166  private:
 167   friend class base::RefCountedThreadSafe<GpuChannelHost>;
 168   GpuChannelHost(GpuChannelHostFactory* factory,
 169                  const gpu::GPUInfo& gpu_info);
 170   virtual ~GpuChannelHost();
 171   void Connect(const IPC::ChannelHandle& channel_handle,
 172                base::WaitableEvent* shutdown_event);
 173
 174   // A filter used internally to route incoming messages from the IO thread
 175   // to the correct message loop. It also maintains some shared state between
 176   // all the contexts.
 177   class MessageFilter : public IPC::MessageFilter {
 178    public:
 179     MessageFilter();
 180
 181     // Called on the IO thread.
 182     void AddRoute(int route_id,
 183                   base::WeakPtr<IPC::Listener> listener,
 184                   scoped_refptr<base::MessageLoopProxy> loop);
 185     // Called on the IO thread.
 186     void RemoveRoute(int route_id);
 187
 188     // IPC::MessageFilter implementation
 189     // (called on the IO thread):
 190     virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
 191     virtual void OnChannelError() OVERRIDE;
 192
 193     // The following methods can be called on any thread.
 194
 195     // Whether the channel is lost.
 196     bool IsLost() const;
 197
 198    private:
 199     virtual ~MessageFilter();
 200
 201     // Threading notes: |listeners_| is only accessed on the IO thread. Every
 202     // other field is protected by |lock_|.
 203     typedef base::hash_map<int, GpuListenerInfo> ListenerMap;
 204     ListenerMap listeners_;
 205
 206     // Protects all fields below this one.
 207     mutable base::Lock lock_;
 208
 209     // Whether the channel has been lost.
 210     bool lost_;
 211   };
 212
 213   // Threading notes: all fields are constant during the lifetime of |this|
 214   // except:
 215   // - |next_transfer_buffer_id_|, atomic type
 216   // - |next_gpu_memory_buffer_id_|, atomic type
 217   // - |next_route_id_|, atomic type
 218   // - |proxies_|, protected by |context_lock_|
 219   GpuChannelHostFactory* const factory_;
 220
 221   const gpu::GPUInfo gpu_info_;
 222
 223   scoped_ptr<IPC::SyncChannel> channel_;
 224   scoped_refptr<MessageFilter> channel_filter_;
 225
 226   // A filter for sending messages from thread other than the main thread.
 227   scoped_refptr<IPC::SyncMessageFilter> sync_filter_;
 228
 229   // Transfer buffer IDs are allocated in sequence.
 230   base::AtomicSequenceNumber next_transfer_buffer_id_;
 231
 232   // Gpu memory buffer IDs are allocated in sequence.
 233   base::AtomicSequenceNumber next_gpu_memory_buffer_id_;
 234
 235   // Route IDs are allocated in sequence.
 236   base::AtomicSequenceNumber next_route_id_;
 237
 238   // Protects proxies_.
 239   mutable base::Lock context_lock_;
 240   // Used to look up a proxy from its routing id.
 241   typedef base::hash_map<int, CommandBufferProxyImpl*> ProxyMap;
 242   ProxyMap proxies_;
 243
 244   DISALLOW_COPY_AND_ASSIGN(GpuChannelHost);
 245 };
 246
 247 }  // namespace content
 248
 249 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_CHANNEL_HOST_H_