Cloning a bunch of stuff from the native_client repository at r6528

ppapi/native_client/src/shared/ppapi_proxy/command_buffer_nacl.cc

Index: ppapi/native_client/src/shared/ppapi_proxy/command_buffer_nacl.cc
===================================================================
--- ppapi/native_client/src/shared/ppapi_proxy/command_buffer_nacl.cc	(revision 0)
+++ ppapi/native_client/src/shared/ppapi_proxy/command_buffer_nacl.cc	(revision 0)
@@ -0,0 +1,205 @@
+// Copyright (c) 2011 The Native Client 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 "native_client/src/shared/ppapi_proxy/command_buffer_nacl.h"
+
+#include <sys/mman.h>
+#include "gpu/command_buffer/common/logging.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_globals.h"
+#include "native_client/src/shared/ppapi_proxy/utility.h"
+#include "ppapi/c/ppb_core.h"
+
+#include "srpcgen/ppb_rpc.h"
+
+using ppapi_proxy::DebugPrintf;
+
+CommandBufferNacl::CommandBufferNacl(PP_Resource graphics_3d,
+                                     const PPB_Core* iface_core)
+    : graphics_3d_(graphics_3d), iface_core_(iface_core) {
+  iface_core_->AddRefResource(graphics_3d_);
+}
+
+CommandBufferNacl::~CommandBufferNacl() {
+  iface_core_->ReleaseResource(graphics_3d_);
+}
+
+bool CommandBufferNacl::Initialize(int32 size) {
+  DebugPrintf("CommandBufferNacl::Initialize\n");
+  int32_t success;
+  NaClSrpcChannel* channel = ppapi_proxy::GetMainSrpcChannel();
+  NaClSrpcError retval =
+      PpbGraphics3DRpcClient::PPB_Graphics3DTrusted_InitCommandBuffer(
+          channel, graphics_3d_, size, &success);
+  DebugPrintf("CommandBufferNaCl::Initialize returned success=%s\n",
+      (PP_TRUE == success) ? "TRUE" : "FALSE");
+  return NACL_SRPC_RESULT_OK == retval && PP_TRUE == success;
+}
+
+gpu::Buffer CommandBufferNacl::GetRingBuffer() {
+  DebugPrintf("CommandBufferNacl::GetRingBuffer\n");
+  if (!buffer_.ptr) {
+    DebugPrintf("CommandBufferNacl::GetRingBuffer: Fetching\n");
+    int shm_handle = -1;
+    int32_t shm_size = 0;
+
+    NaClSrpcChannel* channel = ppapi_proxy::GetMainSrpcChannel();
+    NaClSrpcError retval =
+        PpbGraphics3DRpcClient::PPB_Graphics3DTrusted_GetRingBuffer(
+            channel, graphics_3d_, &shm_handle, &shm_size);
+    if (NACL_SRPC_RESULT_OK != retval) {
+      shm_handle = -1;
+    }
+    buffer_ = BufferFromShm(shm_handle, shm_size);
+  }
+
+  return buffer_;
+}
+
+gpu::CommandBuffer::State CommandBufferNacl::GetState() {
+  DebugPrintf("CommandBufferNacl::GetState\n");
+  PP_Graphics3DTrustedState state;
+  nacl_abi_size_t state_size = static_cast<nacl_abi_size_t>(sizeof(state));
+
+  NaClSrpcChannel* channel = ppapi_proxy::GetMainSrpcChannel();
+  NaClSrpcError retval =
+      PpbGraphics3DRpcClient::PPB_Graphics3DTrusted_GetState(
+          channel, graphics_3d_, &state_size, reinterpret_cast<char*>(&state));
+  if (NACL_SRPC_RESULT_OK != retval
+      || state_size != static_cast<nacl_abi_size_t>(sizeof(state))) {
+    return ErrorGpuState();
+  }
+
+  last_state_ = PpapiToGpuState(state);
+  return last_state_;
+}
+
+gpu::CommandBuffer::State CommandBufferNacl::GetLastState() {
+  return last_state_;
+}
+
+void CommandBufferNacl::Flush(int32 put_offset) {
+  DebugPrintf("CommandBufferNacl::Flush\n");
+  NaClSrpcChannel* channel = ppapi_proxy::GetMainSrpcChannel();
+  PpbGraphics3DRpcClient::PPB_Graphics3DTrusted_Flush(
+      channel, graphics_3d_, put_offset);
+}
+
+gpu::CommandBuffer::State CommandBufferNacl::FlushSync(int32 put_offset,
+                                                       int32 last_known_get) {
+  DebugPrintf("CommandBufferNacl::FlushSync\n");
+  PP_Graphics3DTrustedState state;
+  nacl_abi_size_t state_size = static_cast<nacl_abi_size_t>(sizeof(state));
+
+  NaClSrpcChannel* channel = ppapi_proxy::GetMainSrpcChannel();
+  NaClSrpcError retval =
+      PpbGraphics3DRpcClient::PPB_Graphics3DTrusted_FlushSync(
+          channel,
+          graphics_3d_,
+          put_offset,
+          &state_size,
+          reinterpret_cast<char*>(&state));
+  if (NACL_SRPC_RESULT_OK != retval
+      || state_size != static_cast<nacl_abi_size_t>(sizeof(state))) {
+    return ErrorGpuState();
+  }
+
+  last_state_ = PpapiToGpuState(state);
+  return last_state_;
+}
+
+void CommandBufferNacl::SetGetOffset(int32 get_offset) {
+  DebugPrintf("CommandBufferNacl::SetGetOffset\n");
+  // Not implemented by proxy.
+  GPU_NOTREACHED();
+}
+
+int32 CommandBufferNacl::CreateTransferBuffer(size_t size, int32 id_request) {
+  DebugPrintf("CommandBufferNacl::CreateTransferBuffer\n");
+  int32_t id;
+
+  NaClSrpcChannel* channel = ppapi_proxy::GetMainSrpcChannel();
+  NaClSrpcError retval =
+      PpbGraphics3DRpcClient::PPB_Graphics3DTrusted_CreateTransferBuffer(
+          channel, graphics_3d_, size, id_request, &id);
+  if (NACL_SRPC_RESULT_OK != retval)
+    return 0;
+
+  return id;
+}
+
+void CommandBufferNacl::DestroyTransferBuffer(int32 id) {
+  DebugPrintf("CommandBufferNacl::DestroyTransferBuffer\n");
+  NaClSrpcChannel* channel = ppapi_proxy::GetMainSrpcChannel();
+  PpbGraphics3DRpcClient::PPB_Graphics3DTrusted_DestroyTransferBuffer(
+      channel, graphics_3d_, id);
+}
+
+gpu::Buffer CommandBufferNacl::GetTransferBuffer(int32 id) {
+  DebugPrintf("CommandBufferNacl::GetTransferBuffer\n");
+  int shm_handle;
+  int32_t shm_size;
+
+  NaClSrpcChannel* channel = ppapi_proxy::GetMainSrpcChannel();
+  NaClSrpcError retval =
+      PpbGraphics3DRpcClient::PPB_Graphics3DTrusted_GetTransferBuffer(
+          channel, graphics_3d_, id, &shm_handle, &shm_size);
+  if (NACL_SRPC_RESULT_OK != retval) {
+    return BufferFromShm(-1, 0);
+  }
+  return BufferFromShm(shm_handle, shm_size);
+}
+
+void CommandBufferNacl::SetToken(int32 token) {
+  DebugPrintf("CommandBufferNacl::SetToken\n");
+  // Not implemented by proxy.
+  GPU_NOTREACHED();
+}
+
+void CommandBufferNacl::SetParseError(
+    gpu::error::Error error) {
+  DebugPrintf("CommandBufferNacl::SetParseError\n");
+  // Not implemented by proxy.
+  GPU_NOTREACHED();
+}
+
+void CommandBufferNacl::SetContextLostReason(gpu::error::ContextLostReason) {
+  // Not implemented by proxy.
+  GPU_NOTREACHED();
+}
+
+// static
+gpu::Buffer CommandBufferNacl::BufferFromShm(int shm_handle,
+                                             uint32_t shm_size) {
+  gpu::Buffer buffer;
+  buffer.ptr = mmap(0,
+                    shm_size,
+                    PROT_READ | PROT_WRITE,
+                    MAP_SHARED,
+                    shm_handle,
+                    0);
+  // TODO(neb): Close the fd now that it's mapped.
+  // TODO(neb): Unmap ring & transfer buffers in the destructor.
+  if (NULL != buffer.ptr)
+    buffer.size = shm_size;
+  return buffer;
+}
+
+// static
+gpu::CommandBuffer::State CommandBufferNacl::ErrorGpuState() {
+  gpu::CommandBuffer::State state;
+  state.error = gpu::error::kGenericError;
+  return state;
+}
+
+// static
+gpu::CommandBuffer::State CommandBufferNacl::PpapiToGpuState(
+    PP_Graphics3DTrustedState s) {
+  gpu::CommandBuffer::State state;
+  state.num_entries = s.num_entries;
+  state.get_offset  = s.get_offset;
+  state.put_offset  = s.put_offset;
+  state.token       = s.token;
+  state.error       = static_cast<gpu::error::Error>(s.error);
+  return state;
+}