src/ppapi/proxy/ppapi_command_buffer_proxy.cc

   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 #include "ppapi/proxy/ppapi_command_buffer_proxy.h"
   6
   7 #include "ppapi/proxy/ppapi_messages.h"
   8 #include "ppapi/proxy/proxy_channel.h"
   9 #include "ppapi/shared_impl/api_id.h"
  10 #include "ppapi/shared_impl/host_resource.h"
  11 #include "ppapi/shared_impl/proxy_lock.h"
  12
  13 namespace ppapi {
  14 namespace proxy {
  15
  16 PpapiCommandBufferProxy::PpapiCommandBufferProxy(
  17     const ppapi::HostResource& resource,
  18     ProxyChannel* channel,
  19     const SerializedHandle& shared_state)
  20     : resource_(resource),
  21       channel_(channel) {
  22   shared_state_shm_.reset(
  23       new base::SharedMemory(shared_state.shmem(), false));
  24   shared_state_shm_->Map(shared_state.size());
  25 }
  26
  27 PpapiCommandBufferProxy::~PpapiCommandBufferProxy() {
  28   // gpu::Buffers are no longer referenced, allowing shared memory objects to be
  29   // deleted, closing the handle in this process.
  30 }
  31
  32 bool PpapiCommandBufferProxy::Initialize() {
  33   return true;
  34 }
  35
  36 gpu::CommandBuffer::State PpapiCommandBufferProxy::GetLastState() {
  37   ppapi::ProxyLock::AssertAcquiredDebugOnly();
  38   return last_state_;
  39 }
  40
  41 int32 PpapiCommandBufferProxy::GetLastToken() {
  42   ppapi::ProxyLock::AssertAcquiredDebugOnly();
  43   TryUpdateState();
  44   return last_state_.token;
  45 }
  46
  47 void PpapiCommandBufferProxy::Flush(int32 put_offset) {
  48   if (last_state_.error != gpu::error::kNoError)
  49     return;
  50
  51   IPC::Message* message = new PpapiHostMsg_PPBGraphics3D_AsyncFlush(
  52       ppapi::API_ID_PPB_GRAPHICS_3D, resource_, put_offset);
  53
  54   // Do not let a synchronous flush hold up this message. If this handler is
  55   // deferred until after the synchronous flush completes, it will overwrite the
  56   // cached last_state_ with out-of-date data.
  57   message->set_unblock(true);
  58   Send(message);
  59 }
  60
  61 void PpapiCommandBufferProxy::WaitForTokenInRange(int32 start, int32 end) {
  62   TryUpdateState();
  63   if (!InRange(start, end, last_state_.token) &&
  64       last_state_.error == gpu::error::kNoError) {
  65     bool success = false;
  66     gpu::CommandBuffer::State state;
  67     if (Send(new PpapiHostMsg_PPBGraphics3D_WaitForTokenInRange(
  68              ppapi::API_ID_PPB_GRAPHICS_3D,
  69              resource_,
  70              start,
  71              end,
  72              &state,
  73              &success)))
  74       UpdateState(state, success);
  75   }
  76   DCHECK(InRange(start, end, last_state_.token) ||
  77          last_state_.error != gpu::error::kNoError);
  78 }
  79
  80 void PpapiCommandBufferProxy::WaitForGetOffsetInRange(int32 start, int32 end) {
  81   TryUpdateState();
  82   if (!InRange(start, end, last_state_.get_offset) &&
  83       last_state_.error == gpu::error::kNoError) {
  84     bool success = false;
  85     gpu::CommandBuffer::State state;
  86     if (Send(new PpapiHostMsg_PPBGraphics3D_WaitForGetOffsetInRange(
  87              ppapi::API_ID_PPB_GRAPHICS_3D,
  88              resource_,
  89              start,
  90              end,
  91              &state,
  92              &success)))
  93       UpdateState(state, success);
  94   }
  95   DCHECK(InRange(start, end, last_state_.get_offset) ||
  96          last_state_.error != gpu::error::kNoError);
  97 }
  98
  99 void PpapiCommandBufferProxy::SetGetBuffer(int32 transfer_buffer_id) {
 100   if (last_state_.error == gpu::error::kNoError) {
 101     Send(new PpapiHostMsg_PPBGraphics3D_SetGetBuffer(
 102          ppapi::API_ID_PPB_GRAPHICS_3D, resource_, transfer_buffer_id));
 103   }
 104 }
 105
 106 scoped_refptr<gpu::Buffer> PpapiCommandBufferProxy::CreateTransferBuffer(
 107     size_t size,
 108     int32* id) {
 109   *id = -1;
 110
 111   if (last_state_.error != gpu::error::kNoError)
 112     return NULL;
 113
 114   // Assuming we are in the renderer process, the service is responsible for
 115   // duplicating the handle. This might not be true for NaCl.
 116   ppapi::proxy::SerializedHandle handle(
 117       ppapi::proxy::SerializedHandle::SHARED_MEMORY);
 118   if (!Send(new PpapiHostMsg_PPBGraphics3D_CreateTransferBuffer(
 119             ppapi::API_ID_PPB_GRAPHICS_3D, resource_, size, id, &handle))) {
 120     return NULL;
 121   }
 122
 123   if (*id <= 0 || !handle.is_shmem())
 124     return NULL;
 125
 126   scoped_ptr<base::SharedMemory> shared_memory(
 127       new base::SharedMemory(handle.shmem(), false));
 128
 129   // Map the shared memory on demand.
 130   if (!shared_memory->memory()) {
 131     if (!shared_memory->Map(handle.size())) {
 132       *id = -1;
 133       return NULL;
 134     }
 135   }
 136
 137   return gpu::MakeBufferFromSharedMemory(shared_memory.Pass(), handle.size());
 138 }
 139
 140 void PpapiCommandBufferProxy::DestroyTransferBuffer(int32 id) {
 141   if (last_state_.error != gpu::error::kNoError)
 142     return;
 143
 144   Send(new PpapiHostMsg_PPBGraphics3D_DestroyTransferBuffer(
 145       ppapi::API_ID_PPB_GRAPHICS_3D, resource_, id));
 146 }
 147
 148 void PpapiCommandBufferProxy::Echo(const base::Closure& callback) {
 149   NOTREACHED();
 150 }
 151
 152 uint32 PpapiCommandBufferProxy::CreateStreamTexture(uint32 texture_id) {
 153   NOTREACHED();
 154   return 0;
 155 }
 156
 157 uint32 PpapiCommandBufferProxy::InsertSyncPoint() {
 158   uint32 sync_point = 0;
 159   if (last_state_.error == gpu::error::kNoError) {
 160     Send(new PpapiHostMsg_PPBGraphics3D_InsertSyncPoint(
 161          ppapi::API_ID_PPB_GRAPHICS_3D, resource_, &sync_point));
 162   }
 163   return sync_point;
 164 }
 165
 166 uint32 PpapiCommandBufferProxy::InsertFutureSyncPoint() {
 167   uint32 sync_point = 0;
 168   if (last_state_.error == gpu::error::kNoError) {
 169     Send(new PpapiHostMsg_PPBGraphics3D_InsertFutureSyncPoint(
 170         ppapi::API_ID_PPB_GRAPHICS_3D, resource_, &sync_point));
 171   }
 172   return sync_point;
 173 }
 174
 175 void PpapiCommandBufferProxy::RetireSyncPoint(uint32 sync_point) {
 176   if (last_state_.error == gpu::error::kNoError) {
 177     Send(new PpapiHostMsg_PPBGraphics3D_RetireSyncPoint(
 178         ppapi::API_ID_PPB_GRAPHICS_3D, resource_, sync_point));
 179   }
 180 }
 181
 182 void PpapiCommandBufferProxy::SignalSyncPoint(uint32 sync_point,
 183                                               const base::Closure& callback) {
 184   NOTREACHED();
 185 }
 186
 187 void PpapiCommandBufferProxy::SignalQuery(uint32 query,
 188                                           const base::Closure& callback) {
 189   NOTREACHED();
 190 }
 191
 192 void PpapiCommandBufferProxy::SetSurfaceVisible(bool visible) {
 193   NOTREACHED();
 194 }
 195
 196 gpu::Capabilities PpapiCommandBufferProxy::GetCapabilities() {
 197   // TODO(boliu): Need to implement this to use cc in Pepper. Tracked in
 198   // crbug.com/325391.
 199   return gpu::Capabilities();
 200 }
 201
 202 gfx::GpuMemoryBuffer* PpapiCommandBufferProxy::CreateGpuMemoryBuffer(
 203     size_t width,
 204     size_t height,
 205     unsigned internalformat,
 206     unsigned usage,
 207     int32* id) {
 208   NOTREACHED();
 209   return NULL;
 210 }
 211
 212 void PpapiCommandBufferProxy::DestroyGpuMemoryBuffer(int32 id) {
 213   NOTREACHED();
 214 }
 215
 216 bool PpapiCommandBufferProxy::Send(IPC::Message* msg) {
 217   DCHECK(last_state_.error == gpu::error::kNoError);
 218
 219   if (channel_->Send(msg))
 220     return true;
 221
 222   last_state_.error = gpu::error::kLostContext;
 223   return false;
 224 }
 225
 226 void PpapiCommandBufferProxy::UpdateState(
 227     const gpu::CommandBuffer::State& state,
 228     bool success) {
 229   // Handle wraparound. It works as long as we don't have more than 2B state
 230   // updates in flight across which reordering occurs.
 231   if (success) {
 232     if (state.generation - last_state_.generation < 0x80000000U) {
 233       last_state_ = state;
 234     }
 235   } else {
 236     last_state_.error = gpu::error::kLostContext;
 237     ++last_state_.generation;
 238   }
 239 }
 240
 241 void PpapiCommandBufferProxy::TryUpdateState() {
 242   if (last_state_.error == gpu::error::kNoError)
 243     shared_state()->Read(&last_state_);
 244 }
 245
 246 gpu::CommandBufferSharedState* PpapiCommandBufferProxy::shared_state() const {
 247   return reinterpret_cast<gpu::CommandBufferSharedState*>(
 248       shared_state_shm_->memory());
 249 }
 250
 251 }  // namespace proxy
 252 }  // namespace ppapi