1 #include "opengl.h"

2

3 static void set_light_param(int idx, unsigned int p, float x, float y, float z)

4 {

5 float v[4];

6 v[0] = x;

7 v[1] = y;

8 v[2] = z;

9 v[3] = 1.0f;

10 glLightfv(GL_LIGHT0 + idx, p, v);

11 }

12

13 void set_light_position(int idx, float x, float y, float z)

14 {

15 set_light_param(idx, GL_POSITION, x, y, z);

16 }

17

18 void set_light_color(int idx, float r, float g, float b)

19 {

20 set_light_param(idx, GL_DIFFUSE, r, g, b);

21 set_light_param(idx, GL_SPECULAR, r, g, b);

22 }

23

24 void set_light_attenuation(int idx, float constant, float linear, float quad)

25 {

26 glLightf(GL_LIGHT0 + idx, GL_CONSTANT_ATTENUATION, constant);

27 glLightf(GL_LIGHT0 + idx, GL_LINEAR_ATTENUATION, linear);

28 glLightf(GL_LIGHT0 + idx, GL_QUADRATIC_ATTENUATION, quad);

29 }

30

31

32 void set_mtl_diffuse(float r, float g, float b, float a)

33 {

34 float color[4];

35 color[0] = r;

36 color[1] = g;

37 color[2] = b;

38 color[3] = a;

39 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, color);

40 }

41

42 void set_mtl_specular(float r, float g, float b)

43 {

44 float color[4];

45 color[0] = r;

46 color[1] = g;

47 color[2] = b;

48 color[3] = 1.0f;

49 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, color);

50 }

51

52 void set_mtl_shininess(float shin)

53 {

54 glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shin > 128.0 ? 128.0 : shin);

55 }

56

57

58 void set_mtl_emission(float r, float g, float b)

59 {

60 float color[4];

61 color[0] = r;

62 color[1] = g;

63 color[2] = b;

64 color[3] = 1.0f;

65 glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, color);

66 }