Inventor/elements/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_ */

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Open Inventor Toolkit reference manual, generated on 15 Mar 2023
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