libgender/util.h

#ifndef UTIL_H
#define UTIL_H

#include <GL/gl.h>

#include <vector>

using namespace std;

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;

#endif

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