1 #ifndef TERRAIN_H_

2 #define TERRAIN_H_

3

4 #include "vmath/vmath.h"

5

6 class Terrain {

7 private:

8 float dx, dy; // inter-pixel distance in uv-space

9 int xsz, ysz;

10 float *hmap;

11

12 float scale, height_scale;

13

14 mutable int dlist, dlist_norm;

15 mutable int dlist_sub[2], dlist_norm_sub[2];

16 mutable float dlist_norm_sz;

17

18 void invalidate_mesh();

19

20 public:

21 Terrain();

22 ~Terrain();

23

24 void set_scale(float s);

25 float get_scale() const;

26

27 void set_height_scale(float s);

28 float get_height_scale() const;

29

30 bool load(const char *fname);

31 int get_map_width() const { return xsz; }

32 int get_map_height() const { return ysz; }

33

34 Vector2 world_to_uv(const Vector2 &pt) const;

35 Vector2 uv_to_world(const Vector2 &pt) const;

36

37 float lookup(int x, int y) const;

38

39 float get_height(const Vector2 &pt) const;

40 Vector3 get_normal(const Vector2 &pt) const;

41

42 float get_world_height(const Vector2 &pt) const;

43

44 bool intersect(const Ray &ray, float *dist) const;

45 bool intersect_micro(const Ray &ray, float *dist, float thres = 0.01) const;

46

47 void draw(int usub = 0, int vsub = 0) const;

48 void draw_normals(float sz = 1.0, int usub = 0, int vsub = 0) const;

49 };

50

51 #endif // TERRAIN_H_