0026292: Visualization - Parallelize queue-based BVH builders (subclasses of BVH_QueueBuilder)

src/BVH/BVH_BuildThread.hxx

@@ -0,0 +1,80 @@
+// Created on: 2015-05-29
+// Created by: Denis BOGOLEPOV
+// Copyright (c) 2013-2014 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef _BVH_BuildThread_Header
+#define _BVH_BuildThread_Header
+
+#include <OSD_Thread.hxx>
+#include <BVH_BuildQueue.hxx>
+
+//! Tool object to call BVH builder subroutines.
+struct BVH_BuildTool
+{
+  //! Performs splitting of the given BVH node.
+  virtual void Perform (const Standard_Integer theNode) = 0;
+};
+
+//! Wrapper for BVH build thread.
+class BVH_BuildThread : public Standard_Transient
+{
+  template <class T, int N> friend class BVH_QueueBuilder;
+
+public:
+
+  //! Creates new BVH build thread.
+  Standard_EXPORT BVH_BuildThread (BVH_BuildTool& theBuildTool, BVH_BuildQueue& theBuildQueue);
+
+  //! Starts execution of BVH build thread.
+  void Run()
+  {
+    myWorkThread.Run (this);
+  }
+
+  //! Waits till the thread finishes execution.
+  void Wait()
+  {
+    myWorkThread.Wait();
+  }
+
+protected:
+
+  //! Executes BVH build thread.
+  Standard_EXPORT void execute();
+
+  //! Thread function for BVH build thread.
+  static Standard_Address threadFunction (Standard_Address theData);
+
+  //! Assignment operator (to remove VC compile warning).
+  BVH_BuildThread& operator= (const BVH_BuildThread&);
+
+protected:
+
+  //! Data needed to build the BVH.
+  BVH_BuildTool& myBuildTool;
+
+  //! Reference to BVH build queue.
+  BVH_BuildQueue& myBuildQueue;
+
+  //! Thread to execute work items.
+  OSD_Thread myWorkThread;
+
+public:
+
+  DEFINE_STANDARD_RTTI(BVH_BuildThread, Standard_Transient)
+};
+
+DEFINE_STANDARD_HANDLE (BVH_BuildThread, Standard_Transient)
+
+#endif // _BVH_BuildThread_Header