1 files changed, 48 insertions, 0 deletions
diff --git a/o3d/gpu_plugin/command_buffer.h b/o3d/gpu_plugin/command_buffer.h
new file mode 100644
index 0000000..454e48a
--- /dev/null
+++ b/o3d/gpu_plugin/command_buffer.h
@@ -0,0 +1,48 @@
+// Copyright (c) 2006-2008 The Chromium 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 O3D_GPU_PLUGIN_COMMAND_BUFFER_H_
+#define O3D_GPU_PLUGIN_COMMAND_BUFFER_H_
+
+#include "o3d/gpu_plugin/np_utils/dispatched_np_object.h"
+
+namespace o3d {
+namespace gpu_plugin {
+
+// An NPObject that implements a shared memory command buffer and a synchronous
+// API to manage the put and get pointers.
+class CommandBuffer : public DispatchedNPObject {
+ public:
+  explicit CommandBuffer(NPP npp);
+  virtual ~CommandBuffer();
+
+  // Create a shared memory buffer of the given size.
+  virtual bool Initialize(int32 size);
+
+  // Gets the shared memory object for the command buffer.
+  virtual NPObjectPointer<NPObject> GetBuffer();
+
+  // The client calls this to update its put offset.
+  virtual void SetPutOffset(int32 offset);
+
+  // The client calls this to get the servers current get offset.
+  virtual int32 GetGetOffset();
+
+ protected:
+  NP_UTILS_BEGIN_DISPATCHER_CHAIN(CommandBuffer, DispatchedNPObject)
+    NP_UTILS_DISPATCHER(Initialize, bool(int32))
+    NP_UTILS_DISPATCHER(SetPutOffset, void(int32))
+    NP_UTILS_DISPATCHER(GetGetOffset, int32())
+    NP_UTILS_DISPATCHER(GetBuffer, NPObjectPointer<NPObject>())
+  NP_UTILS_END_DISPATCHER_CHAIN
+
+ private:
+  NPObjectPointer<NPObject> buffer_object_;
+  NPSharedMemory* shared_memory_;
+};
+
+}  // namespace gpu_plugin
+}  // namespace o3d
+
+#endif  // O3D_GPU_PLUGIN_COMMAND_BUFFER_H_