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 - 1))
#define SOFFS_MAX (soffs)+(1 << (OFFS_BITS - 1))
#define MAXEXTENT ((1UL << OFFS_BITS) - 1)

#define GLFLOAT_MAX 1e30
#define GLFLOAT_MIN -1e30

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;
  }
};

struct point {
  GLfloat x, y, z;

  point () { };
  point (GLfloat x, GLfloat y, GLfloat z) : x(x), y(y), z(z) { };
};

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;
}

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 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);

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_MIN, SOFFS_MIN, SOFFS_MIN);
    b = sector (SOFFS_MAX, SOFFS_MAX, SOFFS_MAX);
  }

  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:	1.8
Committed:	Mon Oct 4 02:06:57 2004 UTC (21 years, 11 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.7:	+11 -5 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			#define SOFFS_MIN (soffs)-(1 << (OFFS_BITS - 1))
15	root	1.8	#define SOFFS_MAX (soffs)+(1 << (OFFS_BITS - 1))
16	root	1.4	#define MAXEXTENT ((1UL << OFFS_BITS) - 1)
17	root	1.1
18			#define GLFLOAT_MAX 1e30
19			#define GLFLOAT_MIN -1e30
20
21			struct sector {
22			soffs x, y, z;
23	root	1.3
24	root	1.8	sector (soffs x = 0, soffs y = 0, soffs z = 0) : x(x), y(y), z(z) { };
25
26	root	1.3	void offset (int subindex, uoffs extent)
27			{
28			if (subindex & 1) x += extent;
29			if (subindex & 2) y += extent;
30			if (subindex & 4) z += extent;
31			}
32	root	1.1	};
33
34			struct point {
35			GLfloat x, y, z;
36
37			point () { };
38			point (GLfloat x, GLfloat y, GLfloat z) : x(x), y(y), z(z) { };
39			};
40
41	root	1.8	inline const sector translate (const sector &p, const sector &src, const sector &dst)
42	root	1.5	{
43	root	1.8	sector r;
44	root	1.5
45			r.x = p.x + (dst.x - src.x);
46			r.y = p.y + (dst.y - src.y);
47			r.z = p.z + (dst.z - src.z);
48
49			return r;
50			}
51
52	root	1.1	struct colour {
53	root	1.2	GLfloat r, g, b, a;
54			colour (GLfloat r = 1., GLfloat g = 1., GLfloat b = 1., GLfloat a = 1.) : r(r), g(g), b(b), a(a) { };
55	root	1.1	};
56
57			struct vec3 {
58			GLfloat x, y, z;
59			vec3 () { };
60			vec3 (GLfloat x, GLfloat y, GLfloat z) : x(x), y(y), z(z) { };
61
62			const vec3 operator -() const
63			{ return vec3 (-x, -y, -z); }
64			};
65
66			const vec3 normalize (const vec3 &v);
67			const vec3 cross (const vec3 &a, const vec3 &b);
68	root	1.6
69			inline const vec3 operator *(const vec3 &a, GLfloat s)
70			{
71			return vec3 (a.x * s, a.y * s, a.z * s);
72			}
73
74			inline GLfloat dot (const vec3 &a, const vec3 &b)
75			{
76			return a.x * b.x + a.y * b.y + a.z * b.z;
77			}
78
79			inline const GLfloat abs (const vec3 &v)
80			{
81			return sqrtf (dot (v, v));
82			}
83	root	1.1
84	root	1.5	struct gl_matrix {
85			GLfloat data[4][4];
86
87			const GLfloat operator ()(int i, int j) const { return data[i][j]; };
88			GLfloat &operator ()(int i, int j) { return data[i][j]; };
89
90			void diagonal (GLfloat v);
91			void clear () { diagonal (0.); };
92			void identity () { diagonal (1.); };
93
94			void print (); // ugly
95
96			void translate (const vec3 &v);
97	root	1.6	void rotate (GLfloat degrees, const vec3 &axis);
98	root	1.5
99			gl_matrix () { };
100			gl_matrix (GLfloat diag) { diagonal (diag); };
101			};
102
103			const gl_matrix operator *(const gl_matrix &a, const gl_matrix &b);
104	root	1.6	const vec3 operator *(const gl_matrix &a, const vec3 &v);
105	root	1.5
106	root	1.1	struct texc {
107			GLfloat s, t;
108			texc () { };
109			texc (GLfloat s, GLfloat t) : s(s), t(t) { };
110			};
111
112			struct box {
113	root	1.8	sector a, b;
114
115			box() { };
116	root	1.1
117			void reset ()
118			{
119	root	1.8	a = sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN);
120			b = sector (SOFFS_MAX, SOFFS_MAX, SOFFS_MAX);
121	root	1.1	}
122
123			void add (const box &o);
124	root	1.8	void add (const sector &p);
125	root	1.1	void add (const point &p);
126			};
127	root	1.5
128			inline const box translate (const box &b, const sector &src, const sector &dst)
129			{
130			box r;
131
132			r.a = translate (b.a, src, dst);
133			r.b = translate (b.b, src, dst);
134
135			return r;
136			}
137	root	1.1
138			struct light {
139			point p;
140			colour c;
141			GLfloat intensity;
142			GLfloat radius;
143	root	1.2	};
144
145			struct material {
146			colour diffuse, specular, emission;
147			GLfloat shininess;
148	root	1.1	};
149
150	root	1.4	struct entity_base;
151			struct draw_context;
152	root	1.7
153			extern struct timer {
154			static double now;
155			static double diff;
156
157			static void frame ();
158			timer ();
159			} timer;
160	root	1.1
161			#endif
162