VolumeViz/nodes/SoVolumeGroup.h

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**=======================================================================*/
/*=======================================================================
** Author      : T. DUFOUR (Nov 2002)
** Modified by : J. SALLANNE (Aug 2012)
**=======================================================================*/
#ifndef  _SO_VOLUME_GROUP_
#define  _SO_VOLUME_GROUP_

#include <VolumeViz/nodes/SoVolumeRender.h>
#include <Inventor/nodes/SoSeparator.h>

#if defined(_WIN32)
#pragma warning(push)
#pragma warning(disable: 4251) // 'identifier' : class 'type' needs to have dll-interface to be used by clients of class 'type2'
#endif

class SoGLObjectCache;
class SoLDMVirtualTexture;
class SoVolumeOffscreenImpl;

class  SoVolumeGroup : public SoSeparator {

  SO_NODE_HEADER( SoVolumeGroup );

 public:
  SoSFBool multiVolumes;

  SoVolumeGroup();

  //------------------------------------------------------------------------------

 private:

  enum VGState
  {
    REGISTERING_VR,
    COLLECTING_SLICE,
    RENDERING_FIRST_PATH,
    RENDERING,
  };

  virtual bool affectsPath() const;

  static void initClass();
  static void exitClass();

  void addVolume(SoState* state, SbVec3f& planeNormal, const SoPath* vrPath, const SoVolumeRender* vr, SoVolumeRenderingQuality* vrq, int vpScale);
  void addSlice(SoLDMVirtualTexture* vt, int, SbVec3f*, float, const SbVec3f& zAxis, const SoVolumeRender* vr);
  VGState getVGState() const { return m_vgState; };

  /* return edgeDetectfragDataId created by registerRTT */
  int getEdgeDetectFragDataId() const;

 private:
  // Destructor
  virtual ~SoVolumeGroup();

 private:
  // VGSlice
  struct VGSlice {
    float sliceSpacing;
    // slice distance from eye (affine component of slice plane), in view space.
    // Note: in view space Z axis goes FROM screen TO viewer. A slice is IN FRONT OF another if its distance is greater.
    float distance;
    SoLDMVirtualTexture* texID;
    int   numVertices;
    SbVec3f vertices[6];
    SbVec3f zAxis;
    const SoVolumeRender* vr;
  };

  struct VRInfo {
    SoPath* path;
    SoGLObjectCache* startDL;
    SoGLObjectCache* endDL;
    SoVolumeRenderingQuality* vrq;
    /* Render at floor(1/vpScale of the viewport size). */
    int vpScale;
  };

  typedef std::map<const SoVolumeRender*, VRInfo> VRInfoMap;

  SoVolumeOffscreenImpl* m_volumeOffscreenImpl;

  SoVRImageSpaceEffects* m_imageSpaceEffects;

  static void clearVRInfoStruct(const VRInfoMap::value_type& p);

  VGState m_vgState;
  VRInfoMap m_vrInfoMap;

  std::vector<VGSlice*> m_slices;

  int m_currentVolume;

  SbMatrix m_currentMatrix, m_currentMatrixInv;
  SbVec3f  m_currentPlane;

  virtual void GLRenderBelowPath(SoGLRenderAction *action);
  virtual void GLRenderInPath(SoGLRenderAction *action);

  void sortSlices();
  void renderSlices(SoState *state);
  static bool compareSlice(const VGSlice *s1, const VGSlice *s2);
  void renderVertices(const std::vector<int>& numVertices, const std::vector<SbVec3f>& vertices);

  bool preRender(SoGLRenderAction *action, int &numberOfVolume);
  void postRender(SoGLRenderAction *action, int numberOfVolume);

  void setVGSlice(VGSlice* slice, float distance, SoLDMVirtualTexture* vt, int numVertices, SbVec3f vertices[], float sliceSpacing, const SbVec3f& zAxis, const SoVolumeRender* vr);

  void beginOffscreenRendering(SoState* state);

  void endOffscreenRendering(SoState* state);

  bool needRttColor(SoState* state, GLenum& internalColorFormat) const;

  bool needRttEdgeDetect(SoState* state, GLenum& internalFormat) const;

  int getEdgeDetect2DMethod(SoState* state) const;

  int getLowResolutionScale(SoState* state) const;

  void updateVRQ(int bitmask, std::vector<int>& bitMaskVector);

  void restoreVRQ(const std::vector<int>& bitMaskVector);

};

#if defined(_WIN32)
#pragma warning(pop)
#endif

#endif // _SO_VOLUME_GROUP_

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Open Inventor Toolkit reference manual, generated on 12 Feb 2024
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