ArrowNode.hh

/*===========================================================================*\
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//=============================================================================
//
//  CLASS ArrowNode
//
//=============================================================================


#ifndef ACG_ARROWNODE_HH
#define ACG_ARROWNODE_HH


//== INCLUDES =================================================================

#include <ACG/Scenegraph/MaterialNode.hh>
#include <ACG/GL/globjects.hh>
#include <ACG/GL/VertexDeclaration.hh>

//== NAMESPACES ===============================================================

namespace ACG {
namespace SceneGraph {

//== CLASS DEFINITION =========================================================



class ACGDLLEXPORT ArrowNode : public MaterialNode
{
public:

  ArrowNode(BaseNode*    _parent = 0,
                  std::string  _name="<ArrowNode>" );

  ~ArrowNode();


  ACG_CLASSNAME(ArrowNode);

  DrawModes::DrawMode  availableDrawModes() const override;

  void boundingBox(Vec3d& _bbMin, Vec3d& _bbMax) override;
  
  void reserve(int _n);

  int addArrow(const Vec3f& _start, const Vec3f& _dir, const Vec3f& _normal = Vec3f(0.0f, 1.0f, 0.0f), const Vec3f& _scale = Vec3f(1.0f, 1.0f, 1.0f), const Vec4uc& _color = Vec4uc(82, 82, 82, 255));

  int addArrow(const Vec3f& _start, const Vec3f& _dir, const Vec3f& _normal, const Vec3f& _scale, const Vec4f& _color);

  int addArrow(const Vec3d& _start, const Vec3d& _dir, const Vec3d& _normal = Vec3d(0.0, 1.0, 0.0), const Vec3d& _scale = Vec3d(1.0, 1.0, 1.0), const Vec4uc& _color = Vec4uc(82, 82, 82, 255));

  int addArrow(const Vec3d& _start, const Vec3d& _dir, const Vec3d& _normal, const Vec3d& _scale, const Vec4f& _color);

  Vec3f arrowStart(int _arrowID) const;

  void arrowStart(int _arrowID, const Vec3f& _start);


  Vec3f arrowDir(int _arrowID) const;

  void arrowDir(int _arrowID, const Vec3f& _dir);


  Vec3f arrowNormal(int _arrowID) const;

  void arrowNormal(int _arrowID, const Vec3f& _normal);

  Vec3f arrowScale(int _arrowID) const;

  void arrowScale(int _arrowID, const Vec3f& _scale);

  Vec4uc arrowColor(int _arrowID) const;

  void arrowColor(int _arrowID, const Vec4uc& _color);

  void clear();

  int n_arrows() const;

  void draw(GLState& _state, const DrawModes::DrawMode& _drawMode) override;

  void getRenderObjects(IRenderer* _renderer, GLState&  _state , const DrawModes::DrawMode&  _drawMode , const ACG::SceneGraph::Material* _mat) override;


private:
  void createArrowMesh();


  GLMatrixf computeWorldMatrix(int _arrow) const;
  GLMatrixf readWorldMatrix(int _arrow) const;
  void updateInstanceData();

  void updateInstanceBuffer();

  // arrow instances

  struct Arrow 
  {
    Vec3f start, dir;
    Vec3f normal;
    Vec3f scale; // width, length, height
    Vec4uc color;

    void orthonormalize();
  };

  std::vector<Arrow> arrows_;

  // arrow mesh:
  int               numVertices_;
  int               numIndices_;
  GeometryBuffer    vertexBuffer_;
  IndexBuffer       indexBuffer_;
  VertexDeclaration vertexDecl_;
  Vec3f             localArrowMin_;
  Vec3f             localArrowMax_;


  // instance data:
  //  float4x3 world transform
  //  ubyte4_norm color

  // dword offset of the instance data of an arrow ( modify this if more data gets appended )
  int instanceDataOffset(int _arrow) const {return _arrow * (4*3 + 3*3 +1);}

  // size in dwords of instance data ( modify this if more data gets appended )
  int instanceDataSize() const {return 4*3 + 3*3 + 1;}


  std::vector<float> instanceData_;

  // instance vbo
  GeometryBuffer    instanceBuffer_;
  VertexDeclaration vertexDeclInstanced_;


  bool invalidateInstanceData_;
  bool invalidateInstanceBuffer_;
  int supportsInstancing_;
};


//=============================================================================
} // namespace SceneGraph
} // namespace ACG
//=============================================================================
#endif // ACG_ARROWNODE_HH defined
//=============================================================================