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
//=============================================================================