1 #include "opengl.h"

2 #include "light.h"

3

4 Light::Light(const Color &col)

5 : color(col)

6 {

7 intensity = 1.0;

8 }

9

10 Light::~Light() {}

11

12 void Light::set_intensity(float val)

13 {

14 intensity = val;

15 }

16

17 void Light::set_color(const Color &col)

18 {

19 color = col;

20 }

21

22 void Light::use(int id) const

23 {

24 glLightfv(GL_LIGHT0 + id, GL_DIFFUSE, &color.x);

25 glLightfv(GL_LIGHT0 + id, GL_SPECULAR, &color.x);

26 }

27

28

29 PointLight::PointLight()

30 {

31 atten[0] = 1.0f;

32 atten[1] = 0.0f;

33 atten[2] = 0.0f;

34 }

35

36 PointLight::PointLight(const Vector3 &pos, const Color &col)

37 : Light(col)

38 {

39 this->pos = pos;

40 atten[0] = 1.0f;

41 atten[1] = 0.0f;

42 atten[2] = 0.0f;

43 }

44

45 void PointLight::set_position(const Vector3 &pos)

46 {

47 this->pos = pos;

48 }

49

50 void PointLight::set_attenuation(float att_const, float att_lin, float att_quad)

51 {

52 atten[0] = att_const;

53 atten[1] = att_lin;

54 atten[2] = att_quad;

55 }

56

57 void PointLight::use(int id) const

58 {

59 float lpos[] = {pos.x, pos.y, pos.z, 1.0f};

60 glLightfv(GL_LIGHT0 + id, GL_POSITION, lpos);

61 glLightf(GL_LIGHT0 + id, GL_CONSTANT_ATTENUATION, atten[0]);

62 glLightf(GL_LIGHT0 + id, GL_LINEAR_ATTENUATION, atten[1]);

63 glLightf(GL_LIGHT0 + id, GL_QUADRATIC_ATTENUATION, atten[2]);

64 }

65

66

67 void set_light(int id, const Light *lt)

68 {

69 if(lt) {

70 glDisable(GL_LIGHT0 + id);

71 } else {

72 glEnable(GL_LIGHT0 + id);

73 lt->use(id);

74 }

75 }