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 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;
}

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 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_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:	1.9
Committed:	Mon Oct 4 07:04:58 2004 UTC (19 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.8:	+7 -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	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 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	1.9	void renormalize (sector &s, point &p);
53
54	root	1.1	struct colour {
55	root	1.2	GLfloat r, g, b, a;
56			colour (GLfloat r = 1., GLfloat g = 1., GLfloat b = 1., GLfloat a = 1.) : r(r), g(g), b(b), a(a) { };
57	root	1.1	};
58
59			struct vec3 {
60			GLfloat x, y, z;
61			vec3 () { };
62			vec3 (GLfloat x, GLfloat y, GLfloat z) : x(x), y(y), z(z) { };
63
64			const vec3 operator -() const
65			{ return vec3 (-x, -y, -z); }
66			};
67
68			const vec3 normalize (const vec3 &v);
69			const vec3 cross (const vec3 &a, const vec3 &b);
70	root	1.6
71			inline const vec3 operator *(const vec3 &a, GLfloat s)
72			{
73			return vec3 (a.x * s, a.y * s, a.z * s);
74			}
75
76			inline GLfloat dot (const vec3 &a, const vec3 &b)
77			{
78			return a.x * b.x + a.y * b.y + a.z * b.z;
79			}
80
81			inline const GLfloat abs (const vec3 &v)
82			{
83			return sqrtf (dot (v, v));
84			}
85	root	1.1
86	root	1.5	struct gl_matrix {
87			GLfloat data[4][4];
88
89			const GLfloat operator ()(int i, int j) const { return data[i][j]; };
90			GLfloat &operator ()(int i, int j) { return data[i][j]; };
91
92			void diagonal (GLfloat v);
93			void clear () { diagonal (0.); };
94			void identity () { diagonal (1.); };
95
96			void print (); // ugly
97
98			void translate (const vec3 &v);
99	root	1.6	void rotate (GLfloat degrees, const vec3 &axis);
100	root	1.5
101			gl_matrix () { };
102			gl_matrix (GLfloat diag) { diagonal (diag); };
103			};
104
105			const gl_matrix operator *(const gl_matrix &a, const gl_matrix &b);
106	root	1.6	const vec3 operator *(const gl_matrix &a, const vec3 &v);
107	root	1.5
108	root	1.1	struct texc {
109			GLfloat s, t;
110			texc () { };
111			texc (GLfloat s, GLfloat t) : s(s), t(t) { };
112			};
113
114			struct box {
115	root	1.8	sector a, b;
116
117			box() { };
118	root	1.1
119			void reset ()
120			{
121	root	1.9	a = sector (SOFFS_MAX, SOFFS_MAX, SOFFS_MAX);
122			b = sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN);
123	root	1.1	}
124
125			void add (const box &o);
126	root	1.8	void add (const sector &p);
127	root	1.1	void add (const point &p);
128			};
129	root	1.5
130			inline const box translate (const box &b, const sector &src, const sector &dst)
131			{
132			box r;
133
134			r.a = translate (b.a, src, dst);
135			r.b = translate (b.b, src, dst);
136
137			return r;
138			}
139	root	1.1
140			struct light {
141			point p;
142			colour c;
143			GLfloat intensity;
144			GLfloat radius;
145	root	1.2	};
146
147			struct material {
148			colour diffuse, specular, emission;
149			GLfloat shininess;
150	root	1.1	};
151
152	root	1.4	struct entity_base;
153			struct draw_context;
154	root	1.7
155			extern struct timer {
156			static double now;
157			static double diff;
158
159			static void frame ();
160			timer ();
161			} timer;
162	root	1.1
163			#endif
164