libgender/util.h

#ifndef UTIL_H
#define UTIL_H

#include <cmath>
#include <vector>

using namespace std;

#include <GL/gl.h>

typedef int soffs; // 32 bit
typedef unsigned int uoffs;
#define OFFS_BITS 31
#define SOFFS_MIN (soffs)-(1 << (OFFS_BITS - 2))
#define SOFFS_MAX (soffs)+(1 << (OFFS_BITS - 2))
#define MAXEXTENT (1UL << (OFFS_BITS - 1))

#define GLFLOAT_MAX 1e30
#define GLFLOAT_MIN -1e30

struct vec3 {
  GLfloat x, y, z;
  vec3 () { };
  vec3 (GLfloat x, GLfloat y, GLfloat z) : x(x), y(y), z(z) { };

  const vec3 operator -() const
  { return vec3 (-x, -y, -z); }
};

const vec3 normalize (const vec3 &v);
const vec3 cross (const vec3 &a, const vec3 &b);

inline const vec3 operator *(const vec3 &a, GLfloat s)
{
  return vec3 (a.x * s, a.y * s, a.z * s);
}

inline GLfloat dot (const vec3 &a, const vec3 &b)
{
  return a.x * b.x + a.y * b.y + a.z * b.z;
}

inline const GLfloat abs (const vec3 &v)
{
  return sqrtf (dot (v, v));
}

struct gl_matrix {
  GLfloat data[4][4];

  const GLfloat operator ()(int i, int j) const { return data[i][j]; };
  GLfloat &operator ()(int i, int j) { return data[i][j]; };

  void diagonal (GLfloat v);
  void clear () { diagonal (0.); };
  void identity () { diagonal (1.); };

  void print (); // ugly

  void translate (const vec3 &v);
  void rotate (GLfloat degrees, const vec3 &axis);

  gl_matrix () { };
  gl_matrix (GLfloat diag) { diagonal (diag); };
};

const gl_matrix operator *(const gl_matrix &a, const gl_matrix &b);
const vec3 operator *(const gl_matrix &a, const vec3 &v);

typedef vec3 point;

// a generic plane
class plane {
  vec3 n;
  GLfloat d;
public:

  GLfloat distance (const point &p) const
  {
    return dot (n, p) + d;
  }

  plane () { };
  plane (GLfloat a, GLfloat b, GLfloat c, GLfloat d);
};

struct sector {
  soffs x, y, z;

  sector (soffs x = 0, soffs y = 0, soffs z = 0) : x(x), y(y), z(z) { };

  void offset (int subindex, uoffs extent)
  {
    if (subindex & 1) x += extent;
    if (subindex & 2) y += extent;
    if (subindex & 4) z += extent;
  }
};

inline const sector translate (const sector &p, const sector &src, const sector &dst)
{
  sector r;

  r.x = p.x + (dst.x - src.x);
  r.y = p.y + (dst.y - src.y);
  r.z = p.z + (dst.z - src.z);

  return r;
}

void renormalize (sector &s, point &p);

struct colour {
  GLfloat r, g, b, a;
  colour (GLfloat r = 1., GLfloat g = 1., GLfloat b = 1., GLfloat a = 1.) : r(r), g(g), b(b), a(a) { };
};

struct texc {
  GLfloat s, t;
  texc () { };
  texc (GLfloat s, GLfloat t) : s(s), t(t) { };
};

struct box {
  sector a, b;

  box() { };

  void reset ()
  {
    a = sector (SOFFS_MAX, SOFFS_MAX, SOFFS_MAX);
    b = sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN);
  }

  void add (const box &o);
  void add (const sector &p);
  void add (const point &p);
};

inline const box translate (const box &b, const sector &src, const sector &dst)
{
  box r;

  r.a = translate (b.a, src, dst);
  r.b = translate (b.b, src, dst);

  return r;
}

struct light {
  point p;
  colour c;
  GLfloat intensity;
  GLfloat radius;
};

struct material {
  colour diffuse, specular, emission;
  GLfloat shininess;
};

struct entity_base;
struct draw_context;

extern struct timer {
  static double now;
  static double diff;

  static void frame ();
  timer ();
} timer;

#endif

Revision:	1.10
Committed:	Mon Oct 4 10:18:13 2004 UTC (21 years, 11 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.9:	+48 -38 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#ifndef UTIL_H
2			#define UTIL_H
3
4	root	1.7	#include <cmath>
5	root	1.1	#include <vector>
6
7			using namespace std;
8
9	root	1.7	#include <GL/gl.h>
10
11	root	1.3	typedef int soffs; // 32 bit
12			typedef unsigned int uoffs;
13	root	1.4	#define OFFS_BITS 31
14	root	1.9	#define SOFFS_MIN (soffs)-(1 << (OFFS_BITS - 2))
15			#define SOFFS_MAX (soffs)+(1 << (OFFS_BITS - 2))
16			#define MAXEXTENT (1UL << (OFFS_BITS - 1))
17	root	1.1
18			#define GLFLOAT_MAX 1e30
19			#define GLFLOAT_MIN -1e30
20
21			struct vec3 {
22			GLfloat x, y, z;
23			vec3 () { };
24			vec3 (GLfloat x, GLfloat y, GLfloat z) : x(x), y(y), z(z) { };
25
26			const vec3 operator -() const
27			{ return vec3 (-x, -y, -z); }
28			};
29
30			const vec3 normalize (const vec3 &v);
31			const vec3 cross (const vec3 &a, const vec3 &b);
32	root	1.6
33			inline const vec3 operator *(const vec3 &a, GLfloat s)
34			{
35			return vec3 (a.x * s, a.y * s, a.z * s);
36			}
37
38			inline GLfloat dot (const vec3 &a, const vec3 &b)
39			{
40			return a.x * b.x + a.y * b.y + a.z * b.z;
41			}
42
43			inline const GLfloat abs (const vec3 &v)
44			{
45			return sqrtf (dot (v, v));
46			}
47	root	1.1
48	root	1.5	struct gl_matrix {
49			GLfloat data[4][4];
50
51			const GLfloat operator ()(int i, int j) const { return data[i][j]; };
52			GLfloat &operator ()(int i, int j) { return data[i][j]; };
53
54			void diagonal (GLfloat v);
55			void clear () { diagonal (0.); };
56			void identity () { diagonal (1.); };
57
58			void print (); // ugly
59
60			void translate (const vec3 &v);
61	root	1.6	void rotate (GLfloat degrees, const vec3 &axis);
62	root	1.5
63			gl_matrix () { };
64			gl_matrix (GLfloat diag) { diagonal (diag); };
65			};
66
67			const gl_matrix operator *(const gl_matrix &a, const gl_matrix &b);
68	root	1.6	const vec3 operator *(const gl_matrix &a, const vec3 &v);
69	root	1.10
70			typedef vec3 point;
71
72			// a generic plane
73			class plane {
74			vec3 n;
75			GLfloat d;
76			public:
77
78			GLfloat distance (const point &p) const
79			{
80			return dot (n, p) + d;
81			}
82
83			plane () { };
84			plane (GLfloat a, GLfloat b, GLfloat c, GLfloat d);
85			};
86
87			struct sector {
88			soffs x, y, z;
89
90			sector (soffs x = 0, soffs y = 0, soffs z = 0) : x(x), y(y), z(z) { };
91
92			void offset (int subindex, uoffs extent)
93			{
94			if (subindex & 1) x += extent;
95			if (subindex & 2) y += extent;
96			if (subindex & 4) z += extent;
97			}
98			};
99
100			inline const sector translate (const sector &p, const sector &src, const sector &dst)
101			{
102			sector r;
103
104			r.x = p.x + (dst.x - src.x);
105			r.y = p.y + (dst.y - src.y);
106			r.z = p.z + (dst.z - src.z);
107
108			return r;
109			}
110
111			void renormalize (sector &s, point &p);
112
113			struct colour {
114			GLfloat r, g, b, a;
115			colour (GLfloat r = 1., GLfloat g = 1., GLfloat b = 1., GLfloat a = 1.) : r(r), g(g), b(b), a(a) { };
116			};
117	root	1.5
118	root	1.1	struct texc {
119			GLfloat s, t;
120			texc () { };
121			texc (GLfloat s, GLfloat t) : s(s), t(t) { };
122			};
123
124			struct box {
125	root	1.8	sector a, b;
126
127			box() { };
128	root	1.1
129			void reset ()
130			{
131	root	1.9	a = sector (SOFFS_MAX, SOFFS_MAX, SOFFS_MAX);
132			b = sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN);
133	root	1.1	}
134
135			void add (const box &o);
136	root	1.8	void add (const sector &p);
137	root	1.1	void add (const point &p);
138			};
139	root	1.5
140			inline const box translate (const box &b, const sector &src, const sector &dst)
141			{
142			box r;
143
144			r.a = translate (b.a, src, dst);
145			r.b = translate (b.b, src, dst);
146
147			return r;
148			}
149	root	1.1
150			struct light {
151			point p;
152			colour c;
153			GLfloat intensity;
154			GLfloat radius;
155	root	1.2	};
156
157			struct material {
158			colour diffuse, specular, emission;
159			GLfloat shininess;
160	root	1.1	};
161
162	root	1.4	struct entity_base;
163			struct draw_context;
164	root	1.7
165			extern struct timer {
166			static double now;
167			static double diff;
168
169			static void frame ();
170			timer ();
171			} timer;
172	root	1.1
173			#endif
174