libgender/util.h

#ifndef UTIL_H
#define UTIL_H

#include <cmath>
#include <cfloat>
#include <cstdlib>
#include <vector>
#include <string>

#include "opengl.h"

#include <SDL/SDL_image.h>

using namespace std;

typedef long long soffs; // 32 bit
typedef unsigned long long uoffs;
#define OFFS_BITS 63
#define SOFFS_MIN (soffs)-(1LL << (OFFS_BITS - 2))
#define SOFFS_MAX (soffs)+(1LL << (OFFS_BITS - 2))
#define MAXEXTENT (1ULL << (OFFS_BITS - 1))

#define ABS(n) ((n) < 0 ? -(n) : (n))

struct sector
{
  soffs x, y, z;

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

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

inline sector operator +(const sector &a, const sector &b)
{
  return sector (a.x + b.x, a.y + b.y, a.z + b.z);
}

inline sector operator -(const sector &a, const sector &b)
{
  return sector (a.x - b.x, a.y - b.y, a.z - b.z);
}

inline sector operator /(const sector &a, soffs b)
{
  return sector (a.x / b, a.y / b, a.z / b);
}

inline sector operator >>(const sector &a, unsigned int b)
{
  return sector (a.x >> b, a.y >> b, a.z >> b);
}

inline bool operator <=(const sector &a, const sector &b)
{
  return a.x <= b.x && a.y <= b.y && a.z <= b.z;
}

inline soffs max (const sector &a)
{
  return max (a.x, max (a.y, a.z));
}

inline sector translate (const sector &p, const sector &src, const sector &dst)
{
  return p + (dst - src);
}

inline sector abs (const sector &s)
{
  return sector (ABS (s.x), ABS (s.y), ABS (s.z));
}

struct vec2
{
  GLfloat x, y;
  vec2 () { };
  vec2 (GLfloat s) : x(s), y(s) { };
  vec2 (GLfloat x, GLfloat y) : x(x), y(y) { };
};

struct vec3
{
  GLfloat x, y, z;
  vec3 () { };
  vec3 (GLfloat s) : x(s), y(s), z(s) { };
  vec3 (GLfloat x, GLfloat y, GLfloat z) : x(x), y(y), z(z) { };
  vec3 (const sector &s) : x(s.x), y(s.y), z(s.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 const vec3 operator +(const vec3 &a, const vec3 &b)
{
  return vec3 (a.x + b.x, a.y + b.y, a.z + b.z);
}

inline const vec3 operator -(const vec3 &a, const vec3 &b)
{
  return vec3 (a.x - b.x, a.y - b.y, a.z - b.z);
}

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

// squared length
inline const GLfloat length2 (const vec3 &v)
{
  return dot (v, v);
}

inline const GLfloat length (const vec3 &v)
{
  return sqrtf (length2 (v));
}

typedef vec3 point;

struct vec4
{
  GLfloat x, y, z, w;
  vec4 () { };
  vec4 (GLfloat s) : x(s), y(s), z(s), w(s) { };
  vec4 (GLfloat x, GLfloat y, GLfloat z, GLfloat w) : x(x), y(y), z(z), w(w) { };
};

// a generic plane
struct plane
{
  vec3 n;
  GLfloat d;

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

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

struct sphere {
  point p;
  GLfloat r;

  sphere () { };
  sphere (const point &p, GLfloat r) : p(p), r(r) { };
};

inline bool overlap (const sphere &a, const sphere &b)
{
  GLfloat d = a.r + b.r;

  return length2 (a.p - b.p) <= d * d;
}

struct cone {
  point p;
  vec3 a; // axis
  GLfloat f, fs1, fc2; // angle

  cone () { };
  cone (const point &p, const vec3 &a, GLfloat f)
  : p(p), a(a), f(f)
  {
    fs1 = 1.F / sinf (f);
    fc2 = cosf (f); fc2 *= fc2;
  };
};

inline bool overlap (const cone &c, const sphere &s)
{
  vec3 d = s.p - c.p + c.a * (s.r * c.fs1);
  GLfloat dd = dot (c.a, d);
  return dd > 0.F && dd * dd >= length2 (d) * c.fc2;
}

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

struct colour
{
  GLubyte r, g, b, a;
  colour (GLfloat r = 1., GLfloat g = 1., GLfloat b = 1., GLfloat a = 1.)
  : r(GLubyte (r * 255.F + .5F))
  , g(GLubyte (g * 255.F + .5F))
  , b(GLubyte (b * 255.F + .5F))
  , a(GLubyte (a * 255.F + .5F))
  {
  }
};

struct tex2
{
  GLfloat s, t;
  tex2 () { };
  tex2 (GLfloat s, GLfloat t) : s(s), t(t) { };
};

template<typename unused> class gltype_traits { };

template<> struct gltype_traits<GLfloat > { static const GLenum gltype () { return GL_FLOAT; } };
template<> struct gltype_traits<GLdouble> { static const GLenum gltype () { return GL_DOUBLE; } };
template<> struct gltype_traits<GLint   > { static const GLenum gltype () { return GL_INT; } };
template<> struct gltype_traits<GLuint  > { static const GLenum gltype () { return GL_UNSIGNED_INT; } };
template<> struct gltype_traits<GLshort > { static const GLenum gltype () { return GL_SHORT; } };
template<> struct gltype_traits<GLushort> { static const GLenum gltype () { return GL_UNSIGNED_SHORT; } };
template<> struct gltype_traits<GLbyte  > { static const GLenum gltype () { return GL_BYTE; } };
template<> struct gltype_traits<GLubyte > { static const GLenum gltype () { return GL_UNSIGNED_BYTE; } };

template<typename vectype> class vector_traits { };

template<>
struct vector_traits<vec2>
{
  typedef GLfloat basetype;
  static const int dimension () { return 2; }
};

template<>
struct vector_traits<vec3>
{
  typedef GLfloat basetype;
  static const int dimension () { return 3; }
};

template<>
struct vector_traits<vec4>
{
  typedef GLfloat basetype;
  static const int dimension () { return 4; }
};

template<>
struct vector_traits<tex2>
{
  typedef GLfloat basetype;
  static const int dimension () { return 2; }
};

template<>
struct vector_traits<colour>
{
  typedef GLubyte basetype;
  static const int dimension () { return 4; }
};

struct box
{
  point a, b;

  box() { };

  void reset ()
  {
    a = point ( FLT_MAX,  FLT_MAX,  FLT_MAX);
    b = point (-FLT_MAX, -FLT_MAX, -FLT_MAX);
  }

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

struct entity;
struct geometry;
struct view;
struct octant;

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

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

/*
#define MAX_EVENT_TYPES 10
enum event_type { TIMER_EV };
struct event
{
   event_type type;
};

typedef callback1<void, event&> event_cb;

class skedjuhlar
{
   public:
// only 10 types for now
   private:
      vector <list<event_cb> > event_lists;
   
   public:
      skedjuhlar () {
         event_lists.resize (MAX_EVENT_TYPES, list<event_cb>());
      }
      
      void register_event_cb (const event_type &t, const event_cb &e) {
         event_lists[t].push_back (e);
      };
      void send_event (event &e) {
         list<event_cb> &l = event_lists[e.type];
         for (list<event_cb>::iterator it = l.begin (); it != l.end (); it++) {
            (*it)(e);
         }
      };
      void check_events () {
         while (!events.empty ()) {
            event &e = events.pop_front ();
            list<event_cb> &l = event_lists[e->name];
            for (list<event_cb>::iterator it = l.begin (); it !+ l.end (); it++) {
               (*it)(e);
            }
            delete e; // ugly slow? hai hai..... 183G
         }
      }
};

extern skedjuhlar main_scheduler;
*/

namespace gl
{
#ifdef DEBUG
  void errchk (const char *name, const char *args, const char *file, int line);
#endif

  struct vertex_v3f
  {
    point p; // vertex

    vertex_v3f () { };
    vertex_v3f (point p) : p(p) { };

    GLenum gl_format () const { return GL_V3F; }
  };

  struct vertex_t2f_n3f_v3f
  {
    tex2  t; // texture
    vec3  n; // normal
    point p; // vertex

    vertex_t2f_n3f_v3f () { }
    vertex_t2f_n3f_v3f (point p, vec3 n, tex2 t = tex2()) : p(p), n(n), t(t) { }

    GLenum gl_format () const { return GL_T2F_N3F_V3F; }
  };

  GLsizei format_stride (GLenum format);
  GLsizei format_offset_p (GLenum format);
  GLsizei format_offset_n (GLenum format);
  GLsizei format_offset_t (GLenum format);

  struct index_ushort
  {
    GLushort i;

    index_ushort () { }
    index_ushort (GLushort i) : i(i) { }

    GLenum gl_format () const { return GL_UNSIGNED_SHORT; }
  };

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

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

    operator GLfloat *() { return &data[0][0]; }

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

    void print (); // ugly

    static const matrix translation (const vec3 &v);
    static const matrix rotation (GLfloat degrees, const vec3 &axis);

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

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

  template<GLenum target>
  struct vertex_buffer_object_base {
    GLuint buffer;
    GLenum format;
    GLsizei count;

    bool alloc ()
    {
      if (buffer)
        return false;

      glGenBuffersARB (1, &buffer);
      return true;
    }

    void bind ()
    {
      glBindBufferARB (target, buffer);
    }

    template<class data>
    void set (const data *d, GLsizei count, GLenum usage = GL_STATIC_DRAW_ARB)
    {
      alloc ();
      format = d->gl_format ();
      this->count = count;
      glBindBufferARB (target, buffer);
      glBufferDataARB (target, count * sizeof (data), d, usage);
    }

    template<class data>
    void set (const vector<data> &d, GLenum usage = GL_STATIC_DRAW_ARB)
    {
      set (&d[0], d.size (), usage);
    }

    vertex_buffer_object_base ()
    : buffer(0)
    {
    }
    
    ~vertex_buffer_object_base ()
    {
      if (buffer)
        glDeleteBuffersARB (1, &buffer);
    }

    operator GLint ()
    {
      return buffer;
    }
  };

  struct vertex_buffer_object : vertex_buffer_object_base<GL_ARRAY_BUFFER_ARB> {
    void bind ()
    {
      vertex_buffer_object_base<GL_ARRAY_BUFFER_ARB>::bind ();
      glInterleavedArrays (format, 0, 0);
    }

    void draw (GLenum mode, GLint first, GLsizei count)
    {
      bind ();
      glDrawArrays (mode, first, count);
    }
  };

  struct index_buffer_object : vertex_buffer_object_base<GL_ELEMENT_ARRAY_BUFFER_ARB> {
    void draw (GLenum mode, GLint first, GLsizei count)
    {
      bind ();
      glDrawElements (mode, count, format, (GLushort*)0 + first); // only SHORT supported :( // first //D//TODO
    }
  };

  void draw_bbox (const sector &a, const sector &b);

}

GLuint SDL_GL_LoadTexture (SDL_Surface *surface, GLfloat *texcoord);

#endif

Revision:	1.52
Committed:	Fri Oct 29 15:58:50 2004 UTC (19 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.51:	+50 -6 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	1.27	#include <cfloat>
6	root	1.39	#include <cstdlib>
7	root	1.1	#include <vector>
8	root	1.22	#include <string>
9	root	1.1
10	root	1.37	#include "opengl.h"
11	root	1.18
12	root	1.37	#include <SDL/SDL_image.h>
13	root	1.30
14	root	1.1	using namespace std;
15	root	1.18
16	root	1.36	typedef long long soffs; // 32 bit
17			typedef unsigned long long uoffs;
18	root	1.39	#define OFFS_BITS 63
19	root	1.36	#define SOFFS_MIN (soffs)-(1LL << (OFFS_BITS - 2))
20			#define SOFFS_MAX (soffs)+(1LL << (OFFS_BITS - 2))
21			#define MAXEXTENT (1ULL << (OFFS_BITS - 1))
22	root	1.1
23	root	1.39	#define ABS(n) ((n) < 0 ? -(n) : (n))
24
25	root	1.37	struct sector
26			{
27	root	1.32	soffs x, y, z;
28
29			sector (soffs x, soffs y, soffs z) : x(x), y(y), z(z) { };
30			sector (soffs xyz = 0) : x(xyz), y(xyz), z(xyz) { };
31
32			void offset (int subindex, uoffs extent)
33			{
34			if (subindex & 1) x += extent;
35			if (subindex & 2) y += extent;
36			if (subindex & 4) z += extent;
37			}
38			};
39
40			inline sector operator +(const sector &a, const sector &b)
41			{
42			return sector (a.x + b.x, a.y + b.y, a.z + b.z);
43			}
44
45			inline sector operator -(const sector &a, const sector &b)
46			{
47			return sector (a.x - b.x, a.y - b.y, a.z - b.z);
48			}
49
50			inline sector operator /(const sector &a, soffs b)
51			{
52			return sector (a.x / b, a.y / b, a.z / b);
53			}
54
55	root	1.40	inline sector operator >>(const sector &a, unsigned int b)
56			{
57			return sector (a.x >> b, a.y >> b, a.z >> b);
58			}
59
60	root	1.32	inline bool operator <=(const sector &a, const sector &b)
61			{
62			return a.x <= b.x && a.y <= b.y && a.z <= b.z;
63			}
64
65			inline soffs max (const sector &a)
66			{
67			return max (a.x, max (a.y, a.z));
68			}
69
70			inline sector translate (const sector &p, const sector &src, const sector &dst)
71			{
72			return p + (dst - src);
73			}
74
75			inline sector abs (const sector &s)
76			{
77	root	1.39	return sector (ABS (s.x), ABS (s.y), ABS (s.z));
78	root	1.32	}
79	root	1.1
80	root	1.51	struct vec2
81			{
82			GLfloat x, y;
83			vec2 () { };
84			vec2 (GLfloat s) : x(s), y(s) { };
85			vec2 (GLfloat x, GLfloat y) : x(x), y(y) { };
86			};
87
88	root	1.37	struct vec3
89			{
90	root	1.1	GLfloat x, y, z;
91			vec3 () { };
92	root	1.32	vec3 (GLfloat s) : x(s), y(s), z(s) { };
93	root	1.1	vec3 (GLfloat x, GLfloat y, GLfloat z) : x(x), y(y), z(z) { };
94	root	1.32	vec3 (const sector &s) : x(s.x), y(s.y), z(s.z) { };
95	root	1.1
96			const vec3 operator -() const
97			{ return vec3 (-x, -y, -z); }
98			};
99
100			const vec3 normalize (const vec3 &v);
101			const vec3 cross (const vec3 &a, const vec3 &b);
102	root	1.6
103			inline const vec3 operator *(const vec3 &a, GLfloat s)
104			{
105			return vec3 (a.x * s, a.y * s, a.z * s);
106			}
107
108	root	1.27	inline const vec3 operator +(const vec3 &a, const vec3 &b)
109			{
110			return vec3 (a.x + b.x, a.y + b.y, a.z + b.z);
111			}
112
113			inline const vec3 operator -(const vec3 &a, const vec3 &b)
114			{
115			return vec3 (a.x - b.x, a.y - b.y, a.z - b.z);
116			}
117
118	root	1.6	inline GLfloat dot (const vec3 &a, const vec3 &b)
119			{
120			return a.x * b.x + a.y * b.y + a.z * b.z;
121			}
122
123	root	1.45	// squared length
124			inline const GLfloat length2 (const vec3 &v)
125	root	1.6	{
126	root	1.45	return dot (v, v);
127			}
128
129			inline const GLfloat length (const vec3 &v)
130			{
131			return sqrtf (length2 (v));
132	root	1.6	}
133	root	1.1
134	root	1.10	typedef vec3 point;
135	root	1.51
136			struct vec4
137			{
138			GLfloat x, y, z, w;
139			vec4 () { };
140			vec4 (GLfloat s) : x(s), y(s), z(s), w(s) { };
141			vec4 (GLfloat x, GLfloat y, GLfloat z, GLfloat w) : x(x), y(y), z(z), w(w) { };
142			};
143	root	1.10
144			// a generic plane
145	root	1.37	struct plane
146			{
147	root	1.10	vec3 n;
148			GLfloat d;
149
150			plane () { };
151			plane (GLfloat a, GLfloat b, GLfloat c, GLfloat d);
152			};
153	root	1.45
154			inline GLfloat distance (const plane &a, const point &p)
155			{
156			return dot (a.n, p) + a.d;
157			}
158
159			struct sphere {
160			point p;
161			GLfloat r;
162
163			sphere () { };
164			sphere (const point &p, GLfloat r) : p(p), r(r) { };
165			};
166
167			inline bool overlap (const sphere &a, const sphere &b)
168			{
169			GLfloat d = a.r + b.r;
170
171			return length2 (a.p - b.p) <= d * d;
172			}
173
174			struct cone {
175			point p;
176			vec3 a; // axis
177	root	1.47	GLfloat f, fs1, fc2; // angle
178	root	1.45
179			cone () { };
180			cone (const point &p, const vec3 &a, GLfloat f)
181			: p(p), a(a), f(f)
182			{
183	root	1.46	fs1 = 1.F / sinf (f);
184	root	1.47	fc2 = cosf (f); fc2 *= fc2;
185	root	1.45	};
186			};
187
188			inline bool overlap (const cone &c, const sphere &s)
189			{
190	root	1.46	vec3 d = s.p - c.p + c.a * (s.r * c.fs1);
191	root	1.47	GLfloat dd = dot (c.a, d);
192			return dd > 0.F && dd * dd >= length2 (d) * c.fc2;
193	root	1.45	}
194	root	1.10
195			void renormalize (sector &s, point &p);
196
197	root	1.37	struct colour
198			{
199	root	1.40	GLubyte r, g, b, a;
200			colour (GLfloat r = 1., GLfloat g = 1., GLfloat b = 1., GLfloat a = 1.)
201			: r(GLubyte (r * 255.F + .5F))
202			, g(GLubyte (g * 255.F + .5F))
203			, b(GLubyte (b * 255.F + .5F))
204			, a(GLubyte (a * 255.F + .5F))
205			{
206			}
207	root	1.10	};
208	root	1.5
209	root	1.40	struct tex2
210	root	1.37	{
211	root	1.1	GLfloat s, t;
212	root	1.40	tex2 () { };
213			tex2 (GLfloat s, GLfloat t) : s(s), t(t) { };
214	root	1.1	};
215
216	root	1.52	template<typename unused> class gltype_traits { };
217
218			template<> struct gltype_traits<GLfloat > { static const GLenum gltype () { return GL_FLOAT; } };
219			template<> struct gltype_traits<GLdouble> { static const GLenum gltype () { return GL_DOUBLE; } };
220			template<> struct gltype_traits<GLint > { static const GLenum gltype () { return GL_INT; } };
221			template<> struct gltype_traits<GLuint > { static const GLenum gltype () { return GL_UNSIGNED_INT; } };
222			template<> struct gltype_traits<GLshort > { static const GLenum gltype () { return GL_SHORT; } };
223			template<> struct gltype_traits<GLushort> { static const GLenum gltype () { return GL_UNSIGNED_SHORT; } };
224			template<> struct gltype_traits<GLbyte > { static const GLenum gltype () { return GL_BYTE; } };
225			template<> struct gltype_traits<GLubyte > { static const GLenum gltype () { return GL_UNSIGNED_BYTE; } };
226
227			template<typename vectype> class vector_traits { };
228
229			template<>
230			struct vector_traits<vec2>
231			{
232			typedef GLfloat basetype;
233			static const int dimension () { return 2; }
234			};
235
236			template<>
237			struct vector_traits<vec3>
238			{
239			typedef GLfloat basetype;
240			static const int dimension () { return 3; }
241			};
242
243			template<>
244			struct vector_traits<vec4>
245			{
246			typedef GLfloat basetype;
247			static const int dimension () { return 4; }
248			};
249
250			template<>
251			struct vector_traits<tex2>
252			{
253			typedef GLfloat basetype;
254			static const int dimension () { return 2; }
255			};
256
257			template<>
258			struct vector_traits<colour>
259			{
260			typedef GLubyte basetype;
261			static const int dimension () { return 4; }
262			};
263
264	root	1.37	struct box
265			{
266	root	1.27	point a, b;
267	root	1.8
268			box() { };
269	root	1.1
270			void reset ()
271			{
272	root	1.27	a = point ( FLT_MAX, FLT_MAX, FLT_MAX);
273			b = point (-FLT_MAX, -FLT_MAX, -FLT_MAX);
274	root	1.1	}
275
276			void add (const box &o);
277			void add (const point &p);
278			};
279	root	1.5
280	root	1.27	struct entity;
281			struct geometry;
282	root	1.20	struct view;
283	root	1.32	struct octant;
284	root	1.7
285	root	1.37	extern struct timer
286			{
287	root	1.7	static double now;
288			static double diff;
289	root	1.44	static double fps;
290	root	1.7
291			static void frame ();
292			timer ();
293			} timer;
294	root	1.11
295	root	1.13	/*
296	root	1.11	#define MAX_EVENT_TYPES 10
297			enum event_type { TIMER_EV };
298	root	1.37	struct event
299			{
300	root	1.11	event_type type;
301			};
302
303			typedef callback1<void, event&> event_cb;
304
305	root	1.37	class skedjuhlar
306			{
307	root	1.11	public:
308			// only 10 types for now
309			private:
310			vector <list<event_cb> > event_lists;
311
312			public:
313			skedjuhlar () {
314			event_lists.resize (MAX_EVENT_TYPES, list<event_cb>());
315			}
316
317			void register_event_cb (const event_type &t, const event_cb &e) {
318			event_lists[t].push_back (e);
319			};
320			void send_event (event &e) {
321			list<event_cb> &l = event_lists[e.type];
322			for (list<event_cb>::iterator it = l.begin (); it != l.end (); it++) {
323			(*it)(e);
324			}
325			};
326			void check_events () {
327			while (!events.empty ()) {
328			event &e = events.pop_front ();
329			list<event_cb> &l = event_lists[e->name];
330			for (list<event_cb>::iterator it = l.begin (); it !+ l.end (); it++) {
331			(*it)(e);
332			}
333			delete e; // ugly slow? hai hai..... 183G
334			}
335			}
336			};
337
338			extern skedjuhlar main_scheduler;
339	root	1.13	*/
340	root	1.22
341	root	1.37	namespace gl
342			{
343	root	1.41	#ifdef DEBUG
344			void errchk (const char name, const char args, const char *file, int line);
345			#endif
346
347	root	1.40	struct vertex_v3f
348			{
349			point p; // vertex
350
351			vertex_v3f () { };
352			vertex_v3f (point p) : p(p) { };
353
354			GLenum gl_format () const { return GL_V3F; }
355			};
356
357			struct vertex_t2f_n3f_v3f
358			{
359			tex2 t; // texture
360			vec3 n; // normal
361			point p; // vertex
362
363	root	1.48	vertex_t2f_n3f_v3f () { }
364			vertex_t2f_n3f_v3f (point p, vec3 n, tex2 t = tex2()) : p(p), n(n), t(t) { }
365	root	1.40
366			GLenum gl_format () const { return GL_T2F_N3F_V3F; }
367			};
368	root	1.34
369	root	1.49	GLsizei format_stride (GLenum format);
370			GLsizei format_offset_p (GLenum format);
371			GLsizei format_offset_n (GLenum format);
372			GLsizei format_offset_t (GLenum format);
373
374	root	1.48	struct index_ushort
375			{
376			GLushort i;
377
378			index_ushort () { }
379			index_ushort (GLushort i) : i(i) { }
380
381			GLenum gl_format () const { return GL_UNSIGNED_SHORT; }
382			};
383
384	root	1.41	struct matrix
385			{
386			GLfloat data[4][4];
387
388			const GLfloat operator ()(int i, int j) const { return data[j][i]; };
389			GLfloat &operator ()(int i, int j) { return data[j][i]; };
390
391			operator GLfloat *() { return &data[0][0]; }
392
393			void diagonal (GLfloat v);
394			void clear () { diagonal (0.F); };
395			void identity () { diagonal (1.F); };
396
397			void print (); // ugly
398
399			static const matrix translation (const vec3 &v);
400			static const matrix rotation (GLfloat degrees, const vec3 &axis);
401
402			matrix () { };
403			matrix (GLfloat diag) { diagonal (diag); };
404			};
405
406			const matrix operator *(const matrix &a, const matrix &b);
407			const vec3 operator *(const matrix &a, const vec3 &v);
408	root	1.40
409	root	1.48	template<GLenum target>
410			struct vertex_buffer_object_base {
411	root	1.40	GLuint buffer;
412			GLenum format;
413	root	1.52	GLsizei count;
414	root	1.40
415	root	1.48	bool alloc ()
416	root	1.40	{
417	root	1.48	if (buffer)
418			return false;
419
420			glGenBuffersARB (1, &buffer);
421			return true;
422	root	1.40	}
423
424	root	1.48	void bind ()
425	root	1.40	{
426			glBindBufferARB (target, buffer);
427			}
428
429	root	1.48	template<class data>
430			void set (const data *d, GLsizei count, GLenum usage = GL_STATIC_DRAW_ARB)
431	root	1.40	{
432			alloc ();
433	root	1.48	format = d->gl_format ();
434	root	1.52	this->count = count;
435	root	1.40	glBindBufferARB (target, buffer);
436	root	1.48	glBufferDataARB (target, count * sizeof (data), d, usage);
437	root	1.40	}
438
439	root	1.48	template<class data>
440			void set (const vector<data> &d, GLenum usage = GL_STATIC_DRAW_ARB)
441	root	1.40	{
442	root	1.48	set (&d[0], d.size (), usage);
443	root	1.40	}
444
445	root	1.48	vertex_buffer_object_base ()
446	root	1.40	: buffer(0)
447			{
448			}
449
450	root	1.48	~vertex_buffer_object_base ()
451	root	1.40	{
452	root	1.48	if (buffer)
453			glDeleteBuffersARB (1, &buffer);
454	root	1.40	}
455
456			operator GLint ()
457			{
458			return buffer;
459			}
460			};
461
462	root	1.48	struct vertex_buffer_object : vertex_buffer_object_base<GL_ARRAY_BUFFER_ARB> {
463			void bind ()
464			{
465			vertex_buffer_object_base<GL_ARRAY_BUFFER_ARB>::bind ();
466			glInterleavedArrays (format, 0, 0);
467			}
468
469			void draw (GLenum mode, GLint first, GLsizei count)
470			{
471			bind ();
472			glDrawArrays (mode, first, count);
473			}
474			};
475
476			struct index_buffer_object : vertex_buffer_object_base<GL_ELEMENT_ARRAY_BUFFER_ARB> {
477			void draw (GLenum mode, GLint first, GLsizei count)
478			{
479			bind ();
480			glDrawElements (mode, count, format, (GLushort*)0 + first); // only SHORT supported :( // first //D//TODO
481			}
482			};
483
484			void draw_bbox (const sector &a, const sector &b);
485	root	1.49
486	root	1.31	}
487
488	root	1.40	GLuint SDL_GL_LoadTexture (SDL_Surface surface, GLfloat texcoord);
489	root	1.27
490	root	1.1	#endif
491