BoxesNode.hh

#pragma once
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#include <ACG/Scenegraph/MaterialNode.hh>
#include <ACG/Scenegraph/DrawModes.hh>
#include <ACG/GL/VertexDeclaration.hh>
#include <ACG/GL/globjects.hh>
#include <ACG/Math/Matrix3x3T.hh>
#include <vector>
#include <limits>

namespace ACG {
namespace SceneGraph {

struct BoxElement {
    Matrix3x3d transform;
    Vec3d pos;
};

class BoxesNode : public MaterialNode
{
public:
  ACG_CLASSNAME(BoxesNode)

  BoxesNode(BaseNode*    _parent=nullptr,
                  std::string  _name="<BoxesNode>" );

  ~BoxesNode() = default;

  DrawModes::DrawMode availableDrawModes() const override {
      return DrawModes::SOLID_FACES_COLORED_FLAT_SHADED;
  }

  void boundingBox(Vec3d& _bbMin, Vec3d& _bbMax) override;
  
  void clear() { elem_.clear(); updateVBO_ = true; }

  void reserve(size_t _n) { elem_.reserve(_n); }

  void push_back(const BoxElement& _v) { elem_.push_back(_v); updateVBO_ = true; }
  typedef BoxElement         value_type;
  typedef BoxElement&        reference;
  typedef const BoxElement&  const_reference;

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

  void setScaleFactor(float _val) { scaleFactor_ = _val;}

protected:
  void createVBO();

  std::vector<BoxElement> elem_;
  float scaleFactor_ = 1.0f;

  // geometry of a single box
  std::vector<std::array<Vec3f,3>> triangles_;
  std::vector<Vec4f> triangle_colors_;

  GeometryBuffer geometry_vbo_;
  GeometryBuffer instance_vbo_;

  // True if points changed and the vbo has to be updated
  bool         updateVBO_;

  ACG::VertexDeclaration vertexDecl_;

  std::string boxesNodeName_;
};


//=============================================================================
} // namespace SceneGraph
} // namespace ACG
//=============================================================================