/*! --------------------------------------------------------------------

  \file   Camera.h

  \brief  Class to a encapsulate a camera

  \author James Kuffner
  \date   2002-09-20

 -------------------------------------------------------------------- */

#ifndef __CAMERA_H__
#define __CAMERA_H__

#include "pic.h"
#include "m3d.h"
//#include <vec/Vec3.h>

//! convenience definition for the Camera singleton
#define theCamera Camera::getInstance()

//---------------------------------------------------------------------
//                            CameraState
//
//! store a camera state using the familiar 'lookAt' parameters
//
//---------------------------------------------------------------------
struct CameraState
{
  float eye[3];     //! eye position
  float target[3];  //! 'lookAt' target
  float up[3];      //! camera 'up' direction
};



//---------------------------------------------------------------------
//                            Camera
//
//! Class to encapsulate a camera
//
//---------------------------------------------------------------------
class Camera {

 public:

  Camera();
  virtual ~Camera() {}

  //! returns a handle to the singleton instance of Camera (use "theCamera")
  static Camera& getInstance() {
    if (!s_pCamera) s_pCamera = new Camera();
    return *s_pCamera;
  };

  //! set the camera viewing parameters
  void SetViewingParams(float fov, float near_clip, float far_clip);

  //! set the aspect ratio
  void SetAspectRatio(float aspect);

  //! function to retrieve the camera state
  const CameraState& GetDefaultLocation() const { return s_defaultState; }

  //! function to manipulate the camera state
  void SetLocation(const CameraState &state)   { _state = state; }

  //! function to retrieve the camera state
  const CameraState& GetLocation() const   { return _state; }

  //! load the viewing transformations on the GL matrix stacks
  void SetGLViewTransforms();

  //  static Vec3 Camera::RotateVec(float angle, Vec3 rotVec, Vec3 curVec);  

  // static void CaptureImage(int num);
 ////////////////////////////////////////////////////////////////
  static const float DEFAULT_FOV       = 60.0;
  static const float DEFAULT_NEAR_CLIP = 0.5;
  static const float DEFAULT_FAR_CLIP  = 1000.0;
  static const float DEFAULT_ASPECT    = 1.33333333;

  //protected:

  //! singleton instance
  static Camera *s_pCamera;

 private:

  //! default camera location
  static CameraState s_defaultState;

  //! stores camera viewing parameters
  float _fov;
  float _nearClip;
  float _farClip;
  float _aspectRatio;

  //! stores camera state
  CameraState _state;

};

#endif // __CAMERA_H__