nuclear@1: #ifndef TERRAIN_H_
nuclear@1: #define TERRAIN_H_
nuclear@1: 
nuclear@1: #include "vmath/vmath.h"
nuclear@1: 
nuclear@1: class Terrain {
nuclear@1: private:
nuclear@1: 	float dx, dy;	// inter-pixel distance in uv-space
nuclear@1: 	int xsz, ysz;
nuclear@1: 	float *hmap;
nuclear@1: 
nuclear@1: 	float scale, height_scale;
nuclear@1: 
nuclear@1: 	mutable int dlist, dlist_norm;
nuclear@1: 	mutable int dlist_sub[2], dlist_norm_sub[2];
nuclear@1: 	mutable float dlist_norm_sz;
nuclear@1: 
nuclear@1: 	void invalidate_mesh();
nuclear@1: 
nuclear@1: public:
nuclear@1: 	Terrain();
nuclear@1: 	~Terrain();
nuclear@1: 
nuclear@1: 	void set_scale(float s);
nuclear@1: 	float get_scale() const;
nuclear@1: 
nuclear@1: 	void set_height_scale(float s);
nuclear@1: 	float get_height_scale() const;
nuclear@1: 
nuclear@1: 	bool load(const char *fname);
nuclear@1: 	int get_map_width() const { return xsz; }
nuclear@1: 	int get_map_height() const { return ysz; }
nuclear@1: 
nuclear@1: 	Vector2 world_to_uv(const Vector2 &pt) const;
nuclear@1: 	Vector2 uv_to_world(const Vector2 &pt) const;
nuclear@1: 
nuclear@1: 	float lookup(int x, int y) const;
nuclear@1: 
nuclear@1: 	float get_height(const Vector2 &pt) const;
nuclear@1: 	Vector3 get_normal(const Vector2 &pt) const;
nuclear@1: 
nuclear@1: 	float get_world_height(const Vector2 &pt) const;
nuclear@1: 
nuclear@1: 	bool intersect(const Ray &ray, float *dist) const;
nuclear@1: 	bool intersect_micro(const Ray &ray, float *dist, float thres = 0.01) const;
nuclear@1: 
nuclear@1: 	void draw(int usub = 0, int vsub = 0) const;
nuclear@1: 	void draw_normals(float sz = 1.0, int usub = 0, int vsub = 0) const;
nuclear@1: };
nuclear@1: 
nuclear@1: #endif	// TERRAIN_H_