SoVolumeClippingGroup.h

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/*=======================================================================
** Author      : Benjamin GRANGE (Aug 2006)
** Modified    : David BEILLOIN (Mar 2011)
**=======================================================================*/
#ifndef  _SO_VOLUME_CLIPPING_GROUP_
#define  _SO_VOLUME_CLIPPING_GROUP_
 
#include <Inventor/nodes/SoGroup.h>
#include <Inventor/fields/SoSFInt32.h>
#include <Inventor/fields/SoSFFloat.h>
#include <Inventor/SbBox.h>
 
class SoGLDepthPeeling;
class SoState;
 
class  SoVolumeClippingGroup : public SoGroup {
  SO_NODE_HEADER( SoVolumeClippingGroup );
 
 public:
 
  SoVolumeClippingGroup();
 
  SoSFInt32 numPasses;
 
  SoSFBool clipOutside;
 
  static unsigned int getMaxNumPasses();
 
  typedef void SoVolumeClippingGroupCB( SoVolumeClippingGroup* mgr, void* userData );
 
  void setNotEnoughPassCallback( SoVolumeClippingGroupCB* f, void* userData );
 
 private:
  virtual void GLRender(SoGLRenderAction* action);
  virtual void doAction(SoAction* action);
  virtual void getBoundingBox(SoGetBoundingBoxAction* action);
 
  virtual void rayPick(SoRayPickAction* action);
 
 private:
  static void initClass();
  static void exitClass();
 
  //Get the texture unit number where the first depth layer is binded
  int getFirstDepthTextureUnit( SoGLRenderAction* action ) const;
 
  //Return the number of depth textures pairs
  int getNumPairs() const;
 
  //Return the real number of depth layer passes used
  int getNumPassUsed() const;
 
  //TRUE if box is not into the clipping volume
  SbBool isCulled(const SbBox3f& box);
 
  // This is used by SoVolumeGroupElement just to ensure that
  // the resources won't be allocated-computed-release for each path
  // collected by the SoVolumeGroup node.
  //
  // This method is called by SoVolumeClippingGroup itself. The SoVolumeGroupElement calls the unlock
  // in order to allow releaseResources to do the job.
  void lockResources();
 
  // Release previously locked resources.
  void unlockResources();
 
  // Indicates if the resources are locked or not.
  bool areResourcesLocked() const;
 
  // Release the depth peeling resources if they are not locked.
  // Most of the time it is called by SoVolumeClippingGroupElement, except when we do multi volume 
  // the release is done by SoVolumeGroupElement.
  void releaseResources();
 
  // Set depth texture in SoVolumeRender
  void setDepthPeelingTextureOnState(SoGLRenderAction* action);
 
  inline const SbXfBox3f& getWorldBbox() const { return m_worldBbox; }
 
  virtual void notify(SoNotList* list);
 
private:
  virtual ~SoVolumeClippingGroup();
 
private:
 
  enum LayersState
  {
    NOT_COMPUTED,
    COMPUTED,
  };
 
  LayersState m_layersState;
 
  bool m_isLocked;
 
  struct NotEnoughLayerCBData {
    NotEnoughLayerCBData() : m_notEnoughPassCB(NULL), m_notEnoughPassCBData(NULL), that(NULL) {}
    SoVolumeClippingGroupCB* m_notEnoughPassCB;
    void* m_notEnoughPassCBData;
    SoVolumeClippingGroup* that;
  };
  NotEnoughLayerCBData m_notEnoughLayerCBData;
 
  static void notEnoughLayerCB(void* userData, SoGLDepthPeeling* mgr);
 
  void commonInit();
 
  SbBool initDepthPeeling(SoGLRenderAction* action, const SbVec2s& vpSize);
 
  SoGLDepthPeeling* m_glDepthPeeling;
 
  SbVec2s m_previousViewportSize;
 
  SbBool m_needViewportSizeUpdate;
 
  // update bbox of the clipping volume
  void updateChildBBox();
 
  // get bbox of the clipping volume
  const SbXfBox3f& getBBox(SoAction*);
 
  bool m_applyTochild;
  SbXfBox3f m_bbox;
  bool m_bboxCacheClean;
 
  SbXfBox3f m_worldBbox;
 
  struct SoVolumeClippingInfos {
    SoVolumeClippingGroup* cg;
    SoGLRenderAction* ra;
  } m_clippingInfos;
  static void renderCB(void* userData, SoGLDepthPeeling* );
 
  SbBool m_depthPeelingPass;
 
  SbBool m_releaseResources;
};
/*----------------------------------------------------------------------------*/
#endif