GLPrimitives.hh

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//=============================================================================
//
//  CLASS GLPrimitive
//
//=============================================================================

#ifndef ACG_GLPRIMITIVES_HH
#define ACG_GLPRIMITIVES_HH


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


#include <ACG/Config/ACGDefines.hh>
#include <ACG/GL/GLState.hh>
#include <ACG/Math/VectorT.hh>
#include <ACG/GL/VertexDeclaration.hh>


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

namespace ACG {

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

  
class ACGDLLEXPORT GLPrimitive {
public:
  GLPrimitive();
  virtual ~GLPrimitive();

  // bind vbo + gl draw call (fixed function mode)
  // use this function in compatibility profile
  void draw_primitive();

  // activate vertex declaration + gl draw call  (shader mode)
  // _program may be nullptr, in that case the attribute locations are as follows.
  //  0 : float3 position
  //  1 : float3 normal
  //  2 : float2 texcoord
  void draw_primitive(GLSL::Program* _program);

  // add to deferred draw call to renderer
  void addToRenderer_primitive(class IRenderer* _renderer, struct RenderObject* _ro);

  // Triangle or line count must be known before updateVBO.
  // A GLPrimitive can consist of either only lines or only triangles.
  // If getNumTriangles returns nonzero, its assumed to consist of tris only.
  // Otherwise, getNumLines has to return nonzero and GLPrimitive is treated as a line-list.
  virtual int getNumTriangles() = 0;
  virtual int getNumLines() {return 0;}

  // get opengl vbo id
  unsigned int getVBO();

  const VertexDeclaration* getVertexDecl() const;

  enum NormalOrientation {OUTSIDE, INSIDE};

protected:

  // calls addTriangleToVBO to fill vertex buffer
  virtual void updateVBO() = 0;

  void addTriangleToVBO(const ACG::Vec3f* _p, const ACG::Vec3f* _n, const ACG::Vec2f* _tex);
  void addLineToVBO(const ACG::Vec3f* _p, const ACG::Vec3f* _n, const ACG::Vec2f* _tex);

  void bindVBO();

  bool checkVBO();

  void unBindVBO();

  bool vboDataInvalid_;

  NormalOrientation normalOrientation_;

private:

  void updateVBOData();

  int numTris_;
  int numLines_;
  float* vboData_;
  int curTriPtr_;

  VertexDeclaration vertexDecl_;

  unsigned int vbo_;
};

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

class ACGDLLEXPORT GLSphere: public GLPrimitive {
public:

  GLSphere(int _slices, int _stacks);
  ~GLSphere();

  void draw(GLState& _state, float _radius, const ACG::Vec3f& _center = ACG::Vec3f(0.0f, 0.0f, 0.0f));

  void addToRenderer(class IRenderer* _renderer, const struct RenderObject* _base, float _radius, const ACG::Vec3f& _center = ACG::Vec3f(0.0f, 0.0f, 0.0f));

  int getNumTriangles();

private:

  void updateVBO();

  void addTriangle(int sl0, int st0, int sl1, int st1, int sl2, int st2);

  ACG::Vec3f positionOnSphere(int _sliceNumber, int _stackNumber);
  ACG::Vec2f texCoordOnSphere(int _sliceNumber, int _stackNumber);

private:

  int slices_;
  int stacks_;

};

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

class ACGDLLEXPORT GLCone: public GLPrimitive {
public:

  GLCone(int _slices, int _stacks, float _bottomRadius, float _topRadius, bool _bottomCap_, bool _topCap);
  ~GLCone();

  void draw(
      GLState& _state,
      float _height,
      const ACG::Vec3f& _center = ACG::Vec3f(0.0f, 0.0f, 0.0f),
      ACG::Vec3f _upDir = ACG::Vec3f(0.0f, 0.0f, 1.0f));


  void addToRenderer(class IRenderer* _renderer, const struct RenderObject* _base, 
    float _height,
    const ACG::Vec3f& _center = ACG::Vec3f(0.0f, 0.0f, 0.0f),
    ACG::Vec3f _upDir = ACG::Vec3f(0.0f, 0.0f, 1.0f),
    float _radiusScale = 1.0f);

  int getNumTriangles();

  void updateVBO();
  void setBottomRadius(float _bottomRadius);
  void setTopRadius(float _topRadius);
  void setNormalOrientation(NormalOrientation orienation);

private:

  void addTriangle(int sl0, int st0, int sl1, int st1, int sl2, int st2);

  ACG::Vec3f positionOnCone(int _sliceNumber, int _stackNumber);
  ACG::Vec2f texCoordOnCone(int _sliceNumber, int _stackNumber);
  ACG::Vec3f normalOnCone(int _sliceNumber, int _stackNumber);

private:

  int slices_;
  int stacks_;

  float bottomRadius_;
  float topRadius_;

  bool bottomCap_;
  bool topCap_;

};

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

class ACGDLLEXPORT GLCylinder: public GLCone {
public:
  GLCylinder(int _slices, int _stacks, float _radius, bool _bottomCap, bool _topCap);
};

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

class ACGDLLEXPORT GLPartialDisk: public GLPrimitive {
public:
  GLPartialDisk(int _slices, int _loops, float _innerRadius, float _outerRadius, float _startAngle, float _sweepAngle);

  void setInnerRadius(float _innerRadius);
  void setOuterRadius(float _outerRadius);
  int getNumTriangles();

  void draw(
      GLState& _state,
      const ACG::Vec3f& _center = ACG::Vec3f(0.0f, 0.0f, 0.0f),
      ACG::Vec3f _upDir = ACG::Vec3f(0.0f, 0.0f, 1.0f));

protected:
  void updateVBO();

private:
  int slices_;
  int loops_;
  float innerRadius_;
  float outerRadius_;
  float startAngle_;
  float sweepAngle_;
};

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

class ACGDLLEXPORT GLDisk: public GLPartialDisk {
public:
  GLDisk(int _slices, int _loops, float _innerRadius, float _outerRadius);
};

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

// axis-aligned unit cube centered at origin
class ACGDLLEXPORT GLBox: public GLPrimitive {
public:

  GLBox();
  ~GLBox();

  int getNumTriangles();

private:

  void updateVBO();
};

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

// axis-aligned unit cube centered at origin,  only lines
class ACGDLLEXPORT GLLineBox: public GLPrimitive {
public:

  GLLineBox();
  ~GLLineBox();

  int getNumTriangles();
  int getNumLines();

private:

  void updateVBO();
};

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


} // namespace ACG

#endif // ACG_GLPRIMITIVES_HH defined