Cloning a bunch of stuff from the native_client repository at r6528

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

+// 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.
+
+#ifndef NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_COMMAND_BUFFER_NACL_H
+#define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_COMMAND_BUFFER_NACL_H
+
+#include "gpu/command_buffer/common/command_buffer.h"
+#include "ppapi/c/dev/pp_graphics_3d_dev.h"
+#include "ppapi/c/dev/ppb_graphics_3d_trusted_dev.h"
+#include "ppapi/c/pp_resource.h"
+
+struct PPB_Core;
+
+// A CommandBuffer proxy implementation that uses trusted PPAPI interface to
+// access a CommandBuffer.
+
+class CommandBufferNacl : public gpu::CommandBuffer {
+ public:
+  // This class will addref the graphics 3d resource using the core interface.
+  CommandBufferNacl(PP_Resource graphics_3d, const PPB_Core* iface_core);
+  virtual ~CommandBufferNacl();
+
+  // CommandBuffer implementation.
+  virtual bool Initialize(int32 size);
+  virtual bool Initialize(base::SharedMemory* buffer, int32 size) {
+    // TODO(neb): support for nacl if neccessary
+    return false;
+  }
+  virtual gpu::Buffer GetRingBuffer();
+  virtual State GetState();
+  virtual State GetLastState();
+  virtual void Flush(int32 put_offset);
+  virtual State FlushSync(int32 put_offset, int32 last_known_get);
+  virtual void SetGetOffset(int32 get_offset);
+  virtual int32 CreateTransferBuffer(size_t size, int32 id_request);
+  virtual int32 RegisterTransferBuffer(base::SharedMemory* buffer,
+                                       size_t size,
+                                       int32 id_request) {
+    // TODO(neb): support for nacl if neccessary
+    return -1;
+  }
+  virtual void DestroyTransferBuffer(int32 id);
+  virtual gpu::Buffer GetTransferBuffer(int32 handle);
+  virtual void SetToken(int32 token);
+  virtual void SetParseError(gpu::error::Error error);
+  virtual void SetContextLostReason(gpu::error::ContextLostReason);
+
+ private:
+  PP_Resource graphics_3d_;
+  const PPB_Core* iface_core_;
+  gpu::Buffer buffer_;
+  State last_state_;
+
+  static gpu::CommandBuffer::State PpapiToGpuState(PP_Graphics3DTrustedState s);
+  static gpu::CommandBuffer::State ErrorGpuState();
+  static gpu::Buffer BufferFromShm(int shm_handle, uint32_t shm_size);
+};
+
+#endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_COMMAND_BUFFER_NACL_H