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 MAXEXTENT ((1UL << OFFS_BITS) - 1)

#define GLFLOAT_MAX 1e30
#define GLFLOAT_MIN -1e30

struct sector {
  soffs x, y, 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 point translate (const point &p, const sector &src, const sector &dst)
{
  point 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 {
  point a, b;

  void reset ()
  {
    a = point (GLFLOAT_MAX, GLFLOAT_MAX, GLFLOAT_MAX);
    b = point (GLFLOAT_MIN, GLFLOAT_MIN, GLFLOAT_MIN);
  }

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