SoInventorBase.h

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 ***                        BORDEAUX, FRANCE                                        ***
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**=======================================================================*/
/*=======================================================================
** Author      : David Beilloin (MMM yyyy)
**=======================================================================*/
 
#ifndef _SO_INVENTOR_BASE_
#define _SO_INVENTOR_BASE_
 
#include <Inventor/SbBase.h>
#include <Inventor/STL/set>
#include <Inventor/STL/map>
 
#include <Inventor/threads/SbThreadMutex.h>
 
class SbThreadRWMutex;
 
{
public:
  static void init();
 
  static void finish();
 
  static bool isInitialized();
 
private:
  enum PowerState
  { 
    RUNNING,
    RESUME,
    SUSPEND
  };
 
  static void setPowerState(PowerState state);
 
  static PowerState getPowerState();
 
  // We are able to manage 2 multi-threads cases on MS Windows platforms:
  // 1- standard case where all threads share common global objects
  // and can interact each other (notification/rendering/multiGPU...)
  //
  // => this mode is enabled by default
  // 
  // 2- Experimental case where each threads can be considered as a separate Open Inventor application
  // each thread do not share anything, and then are independent from each other.
  // The following objects are thread specific:
  // - SoSensorManager::m_pThreadSensorMgr : SoSensorManagerThread handling notification queues
  // - SoDB::SoGlobalDBInfos               : main globalField, realTimeSensor sensor, realTime field
  // - SoGlobalField::nameDict             : globalField's dictionnary
  // - 
  // IMPORTANT: When using this mode, no notification MUST be done from a a thread to anoher.
  // (ie, it is not allowed to modified an Open Inventor field/node/scenegraph... from another 
  // thread than the one who created the given object.
  //
  // => this mode is enabled through envvar OIV_MULTITHREAD_APPLICATION
  //
  static SbBool isMultiThreadApplication()
  {
    if (s_isMultiThreadApplicationSet)
      return s_isMultiThreadApplication;
    return checkMultiThreadApplicationMode();
  }
 
#if 1             SoDEPRECATED
  static void threadInit();
SoDEPRECATED
  static void threadFinish();
#endif 
  static bool checkMultithread()
  { return s_checkMultithread; }
 
  // globalMutex provides a way for any application to use a global mutex.
  // It is also used inside OIV in some instances
  static SbThreadRWMutex* getGlobalMutex()
  { return globalMutex; }
 
  // returns true if OIV_MULTITHREAD_APPLICATION_DISABLE_LOCK is set, it allows to disable
  // any mutex lock and do internal performance test with OIV_MULTITHREAD_APPLICATION mode set
  static SbBool forceShouldCreateMutex();
 
  // global lock for init/finish operation
  static SbThreadMutex s_initFinishLock;
 
  // returns TRUE if we should use double precision math internally
  // see also SoPreference (OIV_DOUBLE_PRECISION)
  static inline bool useDoublePrecision()
  { return s_doublePrecision; }
 
  static inline void setDoublePrecision( bool val )
  { s_doublePrecision = val; }
 
  // returns TRUE if we should print debug msg when getting Zero vector length
  // see also SoPreference (OIV_REPORT_ZERO_VECTORS)
  static inline bool useReportZeroVector()
  { return s_reportZeroVectors; }
 
  // returns the current intersection epsilon value to use (OIV_INTERSECT_EPSILON)
  static inline double getIntersectionEpsilon()
  { return s_intersectionEpsilon; }
 
  // returns the current intersection epsilon value to use (OIV_INTERSECT_EPSILON)
  static inline double getIntersectionEpsilonSquared()
  { return s_intersectionEpsilonSquared; }
 
  static inline void setIntersectionEpsilon(double epsilon)
  { s_intersectionEpsilon = epsilon; s_intersectionEpsilonSquared = epsilon*epsilon;}
 
  //return true if finish is on the run
  static bool isFinishing();
 
private:
  // library usage counter
  static int s_initRefCount;
 
  // The isMultithreadedApplication flag can be set to true or false only one time, that's
  // why we need a threadApplicationModeIsSet flag.
  static bool checkMultiThreadApplicationMode();
  static bool s_isMultiThreadApplication;
  static bool s_isMultiThreadApplicationSet;
 
  static const char *s_versionString;
  // Global mutex
  static SbThreadRWMutex *globalMutex;
 
  static bool s_checkMultithread;
 
  // Use double precision math internally? (OIV_DOUBLE_PRECISION)
  static bool s_doublePrecision;
 
  // see SoPreference::OIV_REPORT_ZERO_VECTORS envvar
  static bool s_reportZeroVectors;
 
  // see SoPreferences::OIV_INTERSECT_EPSILON
  static double s_intersectionEpsilon;
  static double s_intersectionEpsilonSquared;
 
  static bool s_isFinishing;
 
  static PowerState s_powerState;
};
 
#endif /* _SO_INVENTOR_BASE_ */