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source: orxonox.OLD/orxonox/trunk/src/light.h @ 3538

Last change on this file since 3538 was 3453, checked in by bensch, 20 years ago

orxonox/trunk: light: added ability to generate a spot light

File size: 2.9 KB
Line 
1/*!
2    \file light.h
3    \brief Handles Lights.
4
5    A Light is one of the more important things in a 3D-environment,
6    without it one sees nothing :)
7    It is here for diffuse-, specular- and Bump-Mappings.
8*/
9
10#ifndef _LIGHT_H
11#define _LIGHT_H
12
13#include "world_entity.h"
14#include "glincl.h"
15
16//! The maximum number of Lights this OpenGL-implementation supports
17#define NUMBEROFLIGHTS GL_MAX_LIGHTS
18
19//! Enumerator for the attenuation-Type.
20/**
21   CONSTANT means GL_CONSTANT_ATTENUATION
22   LINEAR means   GL_LINEAR_ATTENUATION
23   QUADRATIC means GL_QUADRATIC_ATTENUATION
24*/
25enum AttenuationType {CONSTANT, LINEAR, QUADRATIC};
26
27// FORWARD DEFINITIONS //
28class Vector;
29
30//! A class that handles Lights
31/**
32   A Light is a source that emits light rays (photons)
33*/
34class Light : public WorldEntity
35{
36 private:
37  //! A struct that holds information about a Light
38  struct LightValue
39  {
40    int lightNumber;            //!< The number of this Light.
41    GLfloat lightPosition[4];   //!< The Position of this Light.
42    GLfloat diffuseColor[4];    //!< The Diffuse Color this Light emmits.
43    GLfloat specularColor[4];   //!< The specular Color of this Light.
44    AttenuationType attenuationType;//!< The AttenuationType of this Light.
45    float attenuationFactor;    //!< The Factor the attenuation should have.
46    GLfloat spotDirection[4];   //!< The direction of the Spot Light.
47    GLfloat spotCutoff;         //!< The cutoff Angle of the Light Source
48  };
49
50  static Light* singletonRef;    //!< This is the LightHandlers Reference.
51  GLfloat ambientColor[4];       //!< The ambient Color of the scene.
52
53
54  Light(void);
55
56  void init(int LightNumber); 
57  LightValue** lights;           //!< An array of Lenght NUMBEROFLIGHTS, that holds pointers to all LightValues.
58  LightValue* currentLight;      //!< The current Light, we are working with.
59 
60 public:
61  static Light* getInstance();
62  ~Light(void);
63
64  // set Attributes
65  int addLight(void);
66  int addLight(int lightNumber);
67  void editLightNumber(int lightNumber);
68  void deleteLight(void);
69  void deleteLight(int lightNumber);
70
71  void setPosition(Vector position);
72  void setPosition(GLfloat x, GLfloat y, GLfloat z);
73  void setDiffuseColor(GLfloat r, GLfloat g, GLfloat b);
74  void setSpecularColor(GLfloat r, GLfloat g, GLfloat b);
75  void setAttenuation(AttenuationType type, float factor);
76  void setAmbientColor(GLfloat r, GLfloat g, GLfloat b);
77  void setSpotDirection(Vector direction);
78  void setSpotCutoff(GLfloat cutoff);
79
80  // get Attributes
81  Vector getPosition(void);
82  /**
83     \returns the Position of Light
84     \param lightNumber lightnumber
85  */
86  inline Vector getPosition(int lightNumber)
87    {
88      if (!this->lights[lightNumber])
89        return Vector(.0,.0,.0);
90      return Vector(this->lights[lightNumber]->lightPosition[0],
91                    this->lights[lightNumber]->lightPosition[1],
92                    this->lights[lightNumber]->lightPosition[2]);
93    }
94
95  void debug(void);
96};
97
98#endif /* _LIGHT_H */
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