ClippingNode.hh

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//=============================================================================
//
//  CLASS ClippingNode
//
//=============================================================================


#ifndef ACG_CLIPPING_NODE_HH
#define ACG_CLIPPING_NODE_HH


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

#include "BaseNode.hh"

#include <ACG/GL/RenderObject.hh>
#include <string>
#include <fstream>

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

namespace ACG {
namespace SceneGraph {
  

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

  
class ACGDLLEXPORT ClippingNode : public BaseNode
{
public:

  ClippingNode( BaseNode*           _parent = 0,
                const std::string&  _name = "<ClippingNode>" )
    : BaseNode(_parent, _name),
      slice_width_(0),
      offset_(0),
      mod_(this)
  {
    plane0_[0] = 0.0;
    plane0_[1] = 0.0;
    plane0_[2] = 0.0;
    plane0_[3] = 0.0;

    plane1_[0] = 0.0;
    plane1_[1] = 0.0;
    plane1_[2] = 0.0;
    plane1_[3] = 0.0;

    offset_plane0_[0] = 0.0;
    offset_plane0_[1] = 0.0;
    offset_plane0_[2] = 0.0;
    offset_plane0_[3] = 0.0;

    offset_plane1_[0] = 0.0;
    offset_plane1_[1] = 0.0;
    offset_plane1_[2] = 0.0;
    offset_plane1_[3] = 0.0;
  }


  virtual ~ClippingNode() {}

  ACG_CLASSNAME(ClippingNode);

  void enter(IRenderer* _renderer, GLState& _state, const DrawModes::DrawMode& _drawmode);

  void leave(IRenderer* _renderer, GLState& _state, const DrawModes::DrawMode& _drawmode);

  void enter(GLState& _state, const DrawModes::DrawMode& _drawmode);

  void leave(GLState& _state, const DrawModes::DrawMode& _drawmode);

  void set_plane(const Vec3f& _position, const Vec3f& _normal, float _eps=0.0);

  const Vec3f& position() const { return position_; }

  const Vec3f& normal() const { return normal_; }

  float slice_width() const { return slice_width_; }

  void set_offset(float _dist);

  Vec4d plane0() const { return Vec4d(offset_plane0_[0], offset_plane0_[1], offset_plane0_[2], offset_plane0_[3]); }

  Vec4d plane1() const { return Vec4d(offset_plane1_[0], offset_plane1_[1], offset_plane1_[2], offset_plane1_[3]); }
  
private:

  Vec3f     position_, normal_;
  GLdouble  plane0_[4], plane1_[4], offset_plane0_[4], offset_plane1_[4];
  float     slice_width_, offset_;

  // modifiers for RenderObject based rendering

  class ACGDLLEXPORT ClippingShaderModifier : public ShaderModifier
  {
  public:
    // this modifier computes the vertex distance to the clip planes and writes them to the gl_ClipDistancei outputs
    // it adds new uniforms:
    //  vec4 g_SlicePlane0;
    //  vec4 g_SlicePlane1;
    //   ..

    explicit ClippingShaderModifier(int _numClipPlanes);
    virtual ~ClippingShaderModifier() {}

    void modifyVertexIO(ShaderGenerator* _shader);

    void modifyVertexBeginCode(QStringList* _code);

  private:

    int numClipPlanes_;
  };

  class ACGDLLEXPORT ClippingObjectModifier : public RenderObjectModifier
  {
  public:
    explicit ClippingObjectModifier(const ClippingNode* _node);
    virtual ~ClippingObjectModifier() {}

    void apply(RenderObject* _obj);

  private:
    const ClippingNode* node_;
  };


  ClippingObjectModifier mod_;

  // shader mod for 1 clipping plane
  static ClippingShaderModifier shaderMod1_;

  // shader mod for 2 clipping planes
  static ClippingShaderModifier shaderMod2_;
};


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