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LightMgr.H

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/*** 
     For each light in the glueconfig, specify:
     TYPE { POINT, DIRECTIONAL, SPOT }
     HEADTRACKED { YES, NO }
     AMBIENT  <color>
     SPECULAR <color>
     DIFFUSE  <color>
     
     if not headtracked, specify:
     (note: pos for a directional light indicates direction.
     a value of <0,0,1> is a light shining in the -Z direction!)
     POS_X <x>
     POS_Y <y>
     POS_Z <z>

     if type is a POINT or SPOT:
     CONSTANTATTEN <0.0 to inf>
     LINEARATTEN <0.0 to inf>
     QUADRATICATTEN <0.0 to inf>

     if type is a SPOT:
     DIR_X <x>
     DIR_Y <y>
     DIR_Z <z>
     CUTOFF <0.0 to 90.0, or 180.0 to turn effect off>
     EXPONENT <0.0 to 128.0, 0.0 = uniform light distribution within the cone>
     
***/     


#ifndef LIGHTMGR_H
#define LIGHTMGR_H

// Gluebase includes
#define OUTSIDE_GLUE_CORE
#include <std/hash.H>
#include <std/strings.H>
#include <mlib/points.H>
#include "Color.H"

#define SPOT_LIGHT_TYPE 2
#define POINT_LIGHT_TYPE 1
#define DIRECTIONAL_LIGHT_TYPE 0

class LIGHTMGR
{
 public:
  static void parseGlueconfig();

  //method to update the position of head-tracked lights
  static void setHeadPos(Wpt hp);
  static void setHeadDir(Wvec dir);

  static bool exists(int light);
  
  //pt/direction of light
  static Wpt getPos(int light);
  static Wvec getDir(int light);
  static int getType(int light);
  
  //colors for lights
  static Color getAmbient(int light);
  static Color getSpecular(int light);
  static Color getDiffuse(int light);
  
  //spotlight characteristics
  static double getExponent(int light);
  static double getCutoff(int light);
  static double getConstantAtten(int light);
  static double getLinearAtten(int light);
  static double getQuadraticAtten(int light);

  static int numLights() { return _type.num(); }

 protected:
  static ARRAY<Wpt> _pos;
  static ARRAY<Wvec> _dir;

  //point or directional or spot
  static ARRAY<int> _type;
  
  //if true, then position is ignored
  static ARRAY<bool> _headTracked;

  //color values for light
  static ARRAY<Color> _ambient;
  static ARRAY<Color> _specular;
  static ARRAY<Color> _diffuse;
  
  //spotlight settings
  static ARRAY<double> _exponent;
  static ARRAY<double> _cutoff;
  static ARRAY<double> _cAtten;
  static ARRAY<double> _lAtten;
  static ARRAY<double> _qAtten;
};

#endif

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