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 "base/numerics/safe_conversions.h"
   8 #include "ppapi/proxy/ppapi_messages.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     PluginDispatcher* dispatcher,
  19     const gpu::Capabilities& capabilities,
  20     const SerializedHandle& shared_state)
  21     : capabilities_(capabilities),
  22       resource_(resource),
  23       dispatcher_(dispatcher) {
  24   shared_state_shm_.reset(
  25       new base::SharedMemory(shared_state.shmem(), false));
  26   shared_state_shm_->Map(shared_state.size());
  27   InstanceData* data = dispatcher->GetInstanceData(resource.instance());
  28   flush_info_ = &data->flush_info_;
  29 }
  30
  31 PpapiCommandBufferProxy::~PpapiCommandBufferProxy() {
  32   // gpu::Buffers are no longer referenced, allowing shared memory objects to be
  33   // deleted, closing the handle in this process.
  34 }
  35
  36 bool PpapiCommandBufferProxy::Initialize() {
  37   return true;
  38 }
  39
  40 gpu::CommandBuffer::State PpapiCommandBufferProxy::GetLastState() {
  41   ppapi::ProxyLock::AssertAcquiredDebugOnly();
  42   return last_state_;
  43 }
  44
  45 int32 PpapiCommandBufferProxy::GetLastToken() {
  46   ppapi::ProxyLock::AssertAcquiredDebugOnly();
  47   TryUpdateState();
  48   return last_state_.token;
  49 }
  50
  51 void PpapiCommandBufferProxy::Flush(int32 put_offset) {
  52   if (last_state_.error != gpu::error::kNoError)
  53     return;
  54
  55   OrderingBarrier(put_offset);
  56   FlushInternal();
  57 }
  58
  59 void PpapiCommandBufferProxy::OrderingBarrier(int32 put_offset) {
  60   if (last_state_.error != gpu::error::kNoError)
  61     return;
  62
  63   if (flush_info_->flush_pending && flush_info_->resource != resource_)
  64     FlushInternal();
  65
  66   flush_info_->flush_pending = true;
  67   flush_info_->resource = resource_;
  68   flush_info_->put_offset = put_offset;
  69 }
  70
  71 void PpapiCommandBufferProxy::WaitForTokenInRange(int32 start, int32 end) {
  72   TryUpdateState();
  73   if (!InRange(start, end, last_state_.token) &&
  74       last_state_.error == gpu::error::kNoError) {
  75     bool success = false;
  76     gpu::CommandBuffer::State state;
  77     if (Send(new PpapiHostMsg_PPBGraphics3D_WaitForTokenInRange(
  78              ppapi::API_ID_PPB_GRAPHICS_3D,
  79              resource_,
  80              start,
  81              end,
  82              &state,
  83              &success)))
  84       UpdateState(state, success);
  85   }
  86   DCHECK(InRange(start, end, last_state_.token) ||
  87          last_state_.error != gpu::error::kNoError);
  88 }
  89
  90 void PpapiCommandBufferProxy::WaitForGetOffsetInRange(int32 start, int32 end) {
  91   TryUpdateState();
  92   if (!InRange(start, end, last_state_.get_offset) &&
  93       last_state_.error == gpu::error::kNoError) {
  94     bool success = false;
  95     gpu::CommandBuffer::State state;
  96     if (Send(new PpapiHostMsg_PPBGraphics3D_WaitForGetOffsetInRange(
  97              ppapi::API_ID_PPB_GRAPHICS_3D,
  98              resource_,
  99              start,
 100              end,
 101              &state,
 102              &success)))
 103       UpdateState(state, success);
 104   }
 105   DCHECK(InRange(start, end, last_state_.get_offset) ||
 106          last_state_.error != gpu::error::kNoError);
 107 }
 108
 109 void PpapiCommandBufferProxy::SetGetBuffer(int32 transfer_buffer_id) {
 110   if (last_state_.error == gpu::error::kNoError) {
 111     Send(new PpapiHostMsg_PPBGraphics3D_SetGetBuffer(
 112          ppapi::API_ID_PPB_GRAPHICS_3D, resource_, transfer_buffer_id));
 113   }
 114 }
 115
 116 scoped_refptr<gpu::Buffer> PpapiCommandBufferProxy::CreateTransferBuffer(
 117     size_t size,
 118     int32* id) {
 119   *id = -1;
 120
 121   if (last_state_.error != gpu::error::kNoError)
 122     return NULL;
 123
 124   // Assuming we are in the renderer process, the service is responsible for
 125   // duplicating the handle. This might not be true for NaCl.
 126   ppapi::proxy::SerializedHandle handle(
 127       ppapi::proxy::SerializedHandle::SHARED_MEMORY);
 128   if (!Send(new PpapiHostMsg_PPBGraphics3D_CreateTransferBuffer(
 129             ppapi::API_ID_PPB_GRAPHICS_3D, resource_,
 130             base::checked_cast<uint32_t>(size), id, &handle))) {
 131     return NULL;
 132   }
 133
 134   if (*id <= 0 || !handle.is_shmem())
 135     return NULL;
 136
 137   scoped_ptr<base::SharedMemory> shared_memory(
 138       new base::SharedMemory(handle.shmem(), false));
 139
 140   // Map the shared memory on demand.
 141   if (!shared_memory->memory()) {
 142     if (!shared_memory->Map(handle.size())) {
 143       *id = -1;
 144       return NULL;
 145     }
 146   }
 147
 148   return gpu::MakeBufferFromSharedMemory(shared_memory.Pass(), handle.size());
 149 }
 150
 151 void PpapiCommandBufferProxy::DestroyTransferBuffer(int32 id) {
 152   if (last_state_.error != gpu::error::kNoError)
 153     return;
 154
 155   Send(new PpapiHostMsg_PPBGraphics3D_DestroyTransferBuffer(
 156       ppapi::API_ID_PPB_GRAPHICS_3D, resource_, id));
 157 }
 158
 159 uint32 PpapiCommandBufferProxy::CreateStreamTexture(uint32 texture_id) {
 160   NOTREACHED();
 161   return 0;
 162 }
 163
 164 void PpapiCommandBufferProxy::SetLock(base::Lock*) {
 165   NOTIMPLEMENTED();
 166 }
 167
 168 bool PpapiCommandBufferProxy::IsGpuChannelLost() {
 169   NOTIMPLEMENTED();
 170   return false;
 171 }
 172
 173 uint32 PpapiCommandBufferProxy::InsertSyncPoint() {
 174   uint32 sync_point = 0;
 175   if (last_state_.error == gpu::error::kNoError) {
 176     Send(new PpapiHostMsg_PPBGraphics3D_InsertSyncPoint(
 177          ppapi::API_ID_PPB_GRAPHICS_3D, resource_, &sync_point));
 178   }
 179   return sync_point;
 180 }
 181
 182 uint32 PpapiCommandBufferProxy::InsertFutureSyncPoint() {
 183   uint32 sync_point = 0;
 184   if (last_state_.error == gpu::error::kNoError) {
 185     Send(new PpapiHostMsg_PPBGraphics3D_InsertFutureSyncPoint(
 186         ppapi::API_ID_PPB_GRAPHICS_3D, resource_, &sync_point));
 187   }
 188   return sync_point;
 189 }
 190
 191 void PpapiCommandBufferProxy::RetireSyncPoint(uint32 sync_point) {
 192   if (last_state_.error == gpu::error::kNoError) {
 193     Send(new PpapiHostMsg_PPBGraphics3D_RetireSyncPoint(
 194         ppapi::API_ID_PPB_GRAPHICS_3D, resource_, sync_point));
 195   }
 196 }
 197
 198 void PpapiCommandBufferProxy::SignalSyncPoint(uint32 sync_point,
 199                                               const base::Closure& callback) {
 200   NOTREACHED();
 201 }
 202
 203 void PpapiCommandBufferProxy::SignalQuery(uint32 query,
 204                                           const base::Closure& callback) {
 205   NOTREACHED();
 206 }
 207
 208 void PpapiCommandBufferProxy::SetSurfaceVisible(bool visible) {
 209   NOTREACHED();
 210 }
 211
 212 gpu::Capabilities PpapiCommandBufferProxy::GetCapabilities() {
 213   return capabilities_;
 214 }
 215
 216 int32 PpapiCommandBufferProxy::CreateImage(ClientBuffer buffer,
 217                                            size_t width,
 218                                            size_t height,
 219                                            unsigned internalformat) {
 220   NOTREACHED();
 221   return -1;
 222 }
 223
 224 void PpapiCommandBufferProxy::DestroyImage(int32 id) {
 225   NOTREACHED();
 226 }
 227
 228 int32 PpapiCommandBufferProxy::CreateGpuMemoryBufferImage(
 229     size_t width,
 230     size_t height,
 231     unsigned internalformat,
 232     unsigned usage) {
 233   NOTREACHED();
 234   return -1;
 235 }
 236
 237 bool PpapiCommandBufferProxy::Send(IPC::Message* msg) {
 238   DCHECK(last_state_.error == gpu::error::kNoError);
 239
 240   // We need to hold the Pepper proxy lock for sync IPC, because the GPU command
 241   // buffer may use a sync IPC with another lock held which could lead to lock
 242   // and deadlock if we dropped the proxy lock here.
 243   // http://crbug.com/418651
 244   if (dispatcher_->SendAndStayLocked(msg))
 245     return true;
 246
 247   last_state_.error = gpu::error::kLostContext;
 248   return false;
 249 }
 250
 251 void PpapiCommandBufferProxy::UpdateState(
 252     const gpu::CommandBuffer::State& state,
 253     bool success) {
 254   // Handle wraparound. It works as long as we don't have more than 2B state
 255   // updates in flight across which reordering occurs.
 256   if (success) {
 257     if (state.generation - last_state_.generation < 0x80000000U) {
 258       last_state_ = state;
 259     }
 260   } else {
 261     last_state_.error = gpu::error::kLostContext;
 262     ++last_state_.generation;
 263   }
 264 }
 265
 266 void PpapiCommandBufferProxy::TryUpdateState() {
 267   if (last_state_.error == gpu::error::kNoError)
 268     shared_state()->Read(&last_state_);
 269 }
 270
 271 gpu::CommandBufferSharedState* PpapiCommandBufferProxy::shared_state() const {
 272   return reinterpret_cast<gpu::CommandBufferSharedState*>(
 273       shared_state_shm_->memory());
 274 }
 275
 276 void PpapiCommandBufferProxy::FlushInternal() {
 277   DCHECK(last_state_.error == gpu::error::kNoError);
 278
 279   DCHECK(flush_info_->flush_pending);
 280
 281   IPC::Message* message = new PpapiHostMsg_PPBGraphics3D_AsyncFlush(
 282       ppapi::API_ID_PPB_GRAPHICS_3D, flush_info_->resource,
 283       flush_info_->put_offset);
 284
 285   // Do not let a synchronous flush hold up this message. If this handler is
 286   // deferred until after the synchronous flush completes, it will overwrite the
 287   // cached last_state_ with out-of-date data.
 288   message->set_unblock(true);
 289   Send(message);
 290
 291   flush_info_->flush_pending = false;
 292   flush_info_->resource.SetHostResource(0, 0);
 293 }
 294
 295 }  // namespace proxy
 296 }  // namespace ppapi