SoCacheElement.h

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/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
** Modified by : Gavin Bell (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_CACHE_ELEMENT_
#define  _SO_CACHE_ELEMENT_
 
#include <Inventor/SbBasic.h>
#include <Inventor/elements/SoSubElement.h>
#include <Inventor/threads/SbThreadLocalStorage.h>
#include <Inventor/misc/SoRef.h>
#include <Inventor/caches/SoCache.h>
#include <Inventor/SoDB.h>
#include <unordered_map>
#include <bitset>
#include <stack>
 
class SoCache;
 
SoEXTENDER_Documented class  SoCacheElement : public SoElement {
 
  SO_ELEMENT_HEADER(SoCacheElement);
 
 public:
  static void         set(SoState *state, SoCache *cache);
 
  SoCache *           getCache() const { return cache.ptr(); }
 
  static SbBool       anyOpen(SoState *state);
 
  static void         closeAnyOpen(SoState* state);
 
  static void         invalidate(SoState *state);
 
  virtual void        pop(SoState *state, const SoElement *prevTopElement);
 
  SoCacheElement *    getNextCacheElement() const
    { return (SoCacheElement *) getNextInStack(); }
 
  virtual void push(SoState *state);
 
private:
 
  virtual void init(SoState *state);
 
  virtual SbBool matches(const SoElement* elt) const;
 
  virtual SoElement* copyMatchInfo() const;
 
 private:
  // Initializes the SoCacheElement class
  static void initClass();
  static void exitClass();
  
  typedef std::bitset<SO_ELEMENT_MAX_KEY> ElementBitList;
 
  void invalidate() const;
 
  static void pushElementSetters(SoState* state, SoElementKeyType keyToPush);
  static void popElementSetters(SoState* state, SoElementKeyType keyToPop);
 
  static void addNodeTraversalStart(SoState* state);
 
  static void trackDependencies(SoState *state, const SoElement *elt);
 
  static void trackGetterDependencies(SoState *state, const SoElement *elt);
 
  static void clearGettersSetters(SoState* state);
 
  // Adds the given element to the elements used lists of all
  // currently open caches in the state
  static void         addElement(SoState *state, const SoElement *elt);
 
  // Adds a dependency on the given cache to all currently open
  // caches in the state
  static void         addCacheDependency(SoState *state, SoCache *cache);
 
  // Sets invalidated bit, and returns its old value.  Used by
  // SoGLCacheList so auto-caching doesn't cache too much.
  static SbBool       setInvalid(SbBool newValue);
 
  // returns the current cache, from the top of the stack.  Does not
  // cause a cache dependence like getConstElement().
  static SoCache *    getCurrentCache(SoState *state)
  {return state->getElementNoPush<SoCacheElement>()->cache.ptr();}
 
  static void flagDelayedPath(SoState* state);
 
  static SbBool listIsOpen(SoState* state);
 
  SoRef<SoGroup> getDependencies(const ElementBitList& elementKeys, std::vector<SoNode*>& dependencies) const;
 
  enum LazyEvaluationPolicy
  {
    DISABLED  = (0),      // Lazy evaluation is disabled
    ENABLED   = (1<<0),   // Lazy evaluation is enabled
    INHERITED = (1<<1)    // Lazy evaluation policy is propagated to children
  };
 
  inline void setLazyEvaluationPolicy(int32_t flag)
  {
    m_lazyEvaluationPolicy = flag;
    if (!hasLazyEvaluation())
      m_lazyEvaluationPolicy = DISABLED;
    if (!isLazyEvaluationEnabled())
      invalidate();
  }
 
  inline bool isLazyEvaluationEnabled() const
  {
    return (m_lazyEvaluationPolicy & ENABLED) > 0;
  }
 
  inline bool isLazyEvaluationInherited() const
  {
    return (m_lazyEvaluationPolicy & INHERITED) > 0;
  }
 
  bool needLazyEval() const;
 
  static void setLazyEvaluationPolicy(SoState *state, int32_t lazyEvaluationPolicyFlag);
 
  static void set(SoState *state, SoCache *cache, int32_t lazyEvaluationPolicyFlag);
  
  static bool needTracking(SoState *state, const SoElement* elt);
 
  static bool needTracking(SoState *state);
 
  static bool hasLazyEvaluation();
 
  struct ElementInfos
  {
    enum Type { PUSH, POP, ELEMENT, NODE_TRAVERSAL_START } ;
    SoElementKeyType elementKey;
    SoNode* node;
    Type type;
 
    ElementInfos(){}
    ElementInfos(SoElementKeyType elementKey, SoNode* node, Type type)
    {
      this->elementKey = elementKey;
      this->node = node;
      this->type = type;
    }
  };
 
  template<typename Data>
  struct ListContainer : public SoRefCounter
  {
    ListContainer()
    {}
 
    void push()
    {
      m_lastSize.push( m_list.size() );
    }
 
    void pop()
    {
      size_t lastSize = m_lastSize.top();
      m_list.resize( lastSize );
      m_lastSize.pop();
    }
 
    std::stack<size_t> m_lastSize;
    std::vector<Data> m_list;
  };
 
  typedef ListContainer<ElementInfos> ElementInfosListContainer;
 
  typedef std::vector<ElementInfos> ElementInfosList;
 
  const ElementInfosList& getElementSetters() const { return m_elementSetters->m_list; }
 
  typedef ListContainer<SoNode*> LazyEvalNodesListContainer;
 
  static const std::vector<uint64_t>& getLazyEvalNodesHashes( const SoState* state );
 
  struct MTstruct
  {
    bool invalidated;
  };
 
  SB_THREAD_TLS_HEADER();
 
 private:
  virtual ~SoCacheElement();
 
 private:
 
  static SoNode* getSetterGetterNode(SoState *state, const SoElement *elt);
  
  SoRef<SoCache> cache; // Stores pointer to cache
 
  SoRef<ElementInfosListContainer> m_elementSetters;
 
  std::vector<SoRef<LazyEvalNodesListContainer> > m_lazyEvalNodesLists;
 
  std::vector<uint64_t> m_lazyEvalNodesHashes;
 
  int32_t m_lazyEvaluationPolicy;
 
  friend class SoElement;
};
 
#endif /* _SO_CACHE_ELEMENT_ */