cvsroot/libgender/util.C

/*
 * math support
 * most of the more complicated code is taken from mesa.
 */

#include <cstdio> // ugly
#include <cmath>

#include <sys/time.h>
#include <time.h>
#include <GL/gl.h>

#include "util.h"
#include "entity.h"

#define DEG2RAD (M_PI / 180.)

void renormalize (sector &s, point &p)
{
  float i;

  p.x = modff (p.x, &i); s.x += (soffs)i;
  p.y = modff (p.y, &i); s.y += (soffs)i;
  p.z = modff (p.z, &i); s.z += (soffs)i;
}

/////////////////////////////////////////////////////////////////////////////

const vec3 normalize (const vec3 &v)
{
  GLfloat s = abs (v);

  if (!s)
    return v;

  s = 1. / s;
  return vec3 (v.x * s, v.y * s, v.z * s);
}

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

/////////////////////////////////////////////////////////////////////////////

void matrix::diagonal (GLfloat v)
{
  for (int i = 4; i--; )
    for (int j = 4; j--; )
      data[i][j] = i == j ? v : 0.;
}

const matrix operator *(const matrix &a, const matrix &b)
{
  matrix r;

  // taken from mesa
  for (int i = 0; i < 4; i++)
    {
      const GLfloat ai0=a(i,0), ai1=a(i,1), ai2=a(i,2), ai3=a(i,3);

      r(i,0) = ai0 * b(0,0) + ai1 * b(1,0) + ai2 * b(2,0) + ai3 * b(3,0);
      r(i,1) = ai0 * b(0,1) + ai1 * b(1,1) + ai2 * b(2,1) + ai3 * b(3,1);
      r(i,2) = ai0 * b(0,2) + ai1 * b(1,2) + ai2 * b(2,2) + ai3 * b(3,2);
      r(i,3) = ai0 * b(0,3) + ai1 * b(1,3) + ai2 * b(2,3) + ai3 * b(3,3);
    }

  return r;
}

const matrix matrix::rotation (GLfloat angle, const vec3 &axis)
{
  GLfloat xx, yy, zz, xy, yz, zx, xs, ys, zs, one_c, s, c;

  s = (GLfloat) sinf (angle * DEG2RAD);
  c = (GLfloat) cosf (angle * DEG2RAD);

  const GLfloat mag = abs (axis);

  if (mag <= 1.0e-4)
    return matrix (1);

  matrix m;
  const vec3 n = axis * (1. / mag);

  xx = n.x * n.x;
  yy = n.y * n.y;
  zz = n.z * n.z;
  xy = n.x * n.y;
  yz = n.y * n.z;
  zx = n.z * n.x;
  xs = n.x * s;
  ys = n.y * s;
  zs = n.z * s;
  one_c = 1.0F - c;

  m(0,0) = (one_c * xx) + c;
  m(0,1) = (one_c * xy) - zs;
  m(0,2) = (one_c * zx) + ys;
  m(0,3) = 0;
  
  m(1,0) = (one_c * xy) + zs;
  m(1,1) = (one_c * yy) + c;
  m(1,2) = (one_c * yz) - xs;
  m(1,3) = 0;
  
  m(2,0) = (one_c * zx) - ys;
  m(2,1) = (one_c * yz) + xs;
  m(2,2) = (one_c * zz) + c;
  m(2,3) = 0;
  
  m(3,0) = 0;
  m(3,1) = 0;
  m(3,2) = 0;
  m(3,3) = 1;

  return m;
}

const vec3 operator *(const matrix &a, const vec3 &v)
{
  return vec3 (
    a(0,0) * v.x + a(0,1) * v.y + a(0,2) * v.z + a(0,3),
    a(1,0) * v.x + a(1,1) * v.y + a(1,2) * v.z + a(1,3),
    a(2,0) * v.x + a(2,1) * v.y + a(2,2) * v.z + a(2,3)
  );
}

void matrix::print ()
{
  printf ("\n");
  printf ("[ %f, %f, %f, %f ]\n", data[0][0], data[1][0], data[2][0], data[3][0]);
  printf ("[ %f, %f, %f, %f ]\n", data[0][1], data[1][1], data[2][1], data[3][1]);
  printf ("[ %f, %f, %f, %f ]\n", data[0][2], data[1][2], data[2][2], data[3][2]);
  printf ("[ %f, %f, %f, %f ]\n", data[0][3], data[1][3], data[2][3], data[3][3]);
}

const matrix matrix::translation (const vec3 &v)
{
  matrix m(1);

  m(0,3) = v.x;
  m(1,3) = v.y;
  m(2,3) = v.z;

  return m;
}

/////////////////////////////////////////////////////////////////////////////

plane::plane (GLfloat a, GLfloat b, GLfloat c, GLfloat d)
: n (vec3 (a,b,c))
{
  GLfloat s = 1. / abs (n);

  n = n * s;
  this->d = d * s;
}

/////////////////////////////////////////////////////////////////////////////

void box::add (const box &o)
{
  a.x = min (a.x, o.a.x);
  a.y = min (a.y, o.a.y);
  a.z = min (a.z, o.a.z);
  b.x = max (b.x, o.b.x);
  b.y = max (b.y, o.b.y);
  b.z = max (b.z, o.b.z);
}

void box::add (const point &p)
{
  a.x = min (a.x, p.x);
  a.y = min (a.y, p.y);
  a.z = min (a.z, p.z);
  b.x = max (b.x, p.x);
  b.y = max (b.y, p.y);
  b.z = max (b.z, p.z);
}

/////////////////////////////////////////////////////////////////////////////

struct timer timer;
static double base;
double timer::now = 0.;
double timer::diff;

void timer::frame ()
{
  struct timeval tv;
  gettimeofday (&tv, 0);

  double next = tv.tv_sec - base + tv.tv_usec / 1.e6;

  diff = next - now;
  now = next;
}

timer::timer ()
{
  struct timeval tv;
  gettimeofday (&tv, 0);
  base = tv.tv_sec + tv.tv_usec / 1.e6;
}

GLuint SDL_GL_LoadTexture (SDL_Surface * surface, GLfloat * texcoord)
{
  GLuint texture;
  int w, h;
  SDL_Surface *image;
  SDL_Rect area;
  Uint32 saved_flags;
  Uint8 saved_alpha;

  /* Use the surface width and height expanded to powers of 2 */
  //w = power_of_two (surface->w);
  //h = power_of_two (surface->h);
  w = power_of_two (surface->w);
  h = power_of_two (surface->h);
  texcoord[0] = 0.0f;           /* Min X */
  texcoord[1] = 0.0f;           /* Min Y */
  texcoord[2] = (GLfloat) surface->w / w;       /* Max X */
  texcoord[3] = (GLfloat) surface->h / h;       /* Max Y */

  image = SDL_CreateRGBSurface (SDL_SWSURFACE, w, h, 32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN     /* OpenGL RGBA masks */
                                0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
#else
                                0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF
#endif
    );
  if (image == NULL)
    {
      return 0;
    }

  /* Save the alpha blending attributes */
  saved_flags = surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK);
  saved_alpha = surface->format->alpha;
  if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
    {
      SDL_SetAlpha (surface, 0, 0);
    }

  /* Copy the surface into the GL texture image */
  area.x = 0;
  area.y = 0;
  area.w = surface->w;
  area.h = surface->h;
  SDL_BlitSurface (surface, &area, image, &area);

  /* Restore the alpha blending attributes */
  if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
    {
      SDL_SetAlpha (surface, saved_flags, saved_alpha);
    }

  /* Create an OpenGL texture for the image */
  glGenTextures (1, &texture);
  glBindTexture (GL_TEXTURE_2D, texture);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexImage2D (GL_TEXTURE_2D,
                0,
                GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
  SDL_FreeSurface (image);      /* No longer needed */

  return texture;
}

//skedjuhlar main_scheduler;

Revision:	1.19
Committed:	Thu Oct 7 23:39:43 2004 UTC (22 years ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.18:	+1 -32 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.3	/*
2			* math support
3			* most of the more complicated code is taken from mesa.
4			*/
5
6	root	1.2	#include <cstdio> // ugly
7	root	1.1	#include <cmath>
8
9	root	1.4	#include <sys/time.h>
10			#include <time.h>
11	root	1.15	#include <GL/gl.h>
12	root	1.2
13	root	1.1	#include "util.h"
14	root	1.15	#include "entity.h"
15	root	1.1
16	root	1.3	#define DEG2RAD (M_PI / 180.)
17
18	root	1.6	void renormalize (sector &s, point &p)
19			{
20			float i;
21
22	root	1.11	p.x = modff (p.x, &i); s.x += (soffs)i;
23			p.y = modff (p.y, &i); s.y += (soffs)i;
24			p.z = modff (p.z, &i); s.z += (soffs)i;
25	root	1.6	}
26
27	root	1.7	/////////////////////////////////////////////////////////////////////////////
28
29	root	1.1	const vec3 normalize (const vec3 &v)
30			{
31	root	1.3	GLfloat s = abs (v);
32
33			if (!s)
34			return v;
35	root	1.1
36	root	1.3	s = 1. / s;
37	root	1.1	return vec3 (v.x * s, v.y * s, v.z * s);
38			}
39
40			const vec3 cross (const vec3 &a, const vec3 &b)
41			{
42			return vec3 (
43	root	1.3	a.y * b.z - a.z * b.y,
44			a.z * b.x - a.x * b.z,
45			a.x * b.y - a.y * b.x
46			);
47	root	1.2	}
48
49	root	1.7	/////////////////////////////////////////////////////////////////////////////
50
51	root	1.12	void matrix::diagonal (GLfloat v)
52	root	1.2	{
53			for (int i = 4; i--; )
54			for (int j = 4; j--; )
55			data[i][j] = i == j ? v : 0.;
56			}
57
58	root	1.12	const matrix operator *(const matrix &a, const matrix &b)
59	root	1.2	{
60	root	1.12	matrix r;
61	root	1.2
62	root	1.3	// taken from mesa
63			for (int i = 0; i < 4; i++)
64			{
65			const GLfloat ai0=a(i,0), ai1=a(i,1), ai2=a(i,2), ai3=a(i,3);
66
67			r(i,0) = ai0 * b(0,0) + ai1 * b(1,0) + ai2 * b(2,0) + ai3 * b(3,0);
68			r(i,1) = ai0 * b(0,1) + ai1 * b(1,1) + ai2 * b(2,1) + ai3 * b(3,1);
69			r(i,2) = ai0 * b(0,2) + ai1 * b(1,2) + ai2 * b(2,2) + ai3 * b(3,2);
70			r(i,3) = ai0 * b(0,3) + ai1 * b(1,3) + ai2 * b(2,3) + ai3 * b(3,3);
71			}
72	root	1.2
73	root	1.3	return r;
74			}
75	root	1.2
76	root	1.12	const matrix matrix::rotation (GLfloat angle, const vec3 &axis)
77	root	1.3	{
78			GLfloat xx, yy, zz, xy, yz, zx, xs, ys, zs, one_c, s, c;
79	root	1.2
80	root	1.3	s = (GLfloat) sinf (angle * DEG2RAD);
81			c = (GLfloat) cosf (angle * DEG2RAD);
82
83			const GLfloat mag = abs (axis);
84
85			if (mag <= 1.0e-4)
86	root	1.12	return matrix (1);
87	root	1.3
88	root	1.12	matrix m;
89	root	1.3	const vec3 n = axis * (1. / mag);
90
91			xx = n.x * n.x;
92			yy = n.y * n.y;
93			zz = n.z * n.z;
94			xy = n.x * n.y;
95			yz = n.y * n.z;
96			zx = n.z * n.x;
97			xs = n.x * s;
98			ys = n.y * s;
99			zs = n.z * s;
100			one_c = 1.0F - c;
101
102			m(0,0) = (one_c * xx) + c;
103			m(0,1) = (one_c * xy) - zs;
104			m(0,2) = (one_c * zx) + ys;
105			m(0,3) = 0;
106
107			m(1,0) = (one_c * xy) + zs;
108			m(1,1) = (one_c * yy) + c;
109			m(1,2) = (one_c * yz) - xs;
110			m(1,3) = 0;
111
112			m(2,0) = (one_c * zx) - ys;
113			m(2,1) = (one_c * yz) + xs;
114			m(2,2) = (one_c * zz) + c;
115			m(2,3) = 0;
116
117			m(3,0) = 0;
118			m(3,1) = 0;
119			m(3,2) = 0;
120			m(3,3) = 1;
121
122	root	1.9	return m;
123	root	1.3	}
124
125	root	1.12	const vec3 operator *(const matrix &a, const vec3 &v)
126	root	1.3	{
127			return vec3 (
128	root	1.9	a(0,0) * v.x + a(0,1) * v.y + a(0,2) * v.z + a(0,3),
129			a(1,0) * v.x + a(1,1) * v.y + a(1,2) * v.z + a(1,3),
130			a(2,0) * v.x + a(2,1) * v.y + a(2,2) * v.z + a(2,3)
131	root	1.3	);
132	root	1.2	}
133
134	root	1.12	void matrix::print ()
135	root	1.2	{
136			printf ("\n");
137			printf ("[ %f, %f, %f, %f ]\n", data[0][0], data[1][0], data[2][0], data[3][0]);
138			printf ("[ %f, %f, %f, %f ]\n", data[0][1], data[1][1], data[2][1], data[3][1]);
139			printf ("[ %f, %f, %f, %f ]\n", data[0][2], data[1][2], data[2][2], data[3][2]);
140			printf ("[ %f, %f, %f, %f ]\n", data[0][3], data[1][3], data[2][3], data[3][3]);
141			}
142
143	root	1.12	const matrix matrix::translation (const vec3 &v)
144	root	1.2	{
145	root	1.12	matrix m(1);
146	root	1.2
147	root	1.9	m(0,3) = v.x;
148			m(1,3) = v.y;
149			m(2,3) = v.z;
150	root	1.2
151	root	1.9	return m;
152	root	1.1	}
153
154	root	1.7	/////////////////////////////////////////////////////////////////////////////
155
156			plane::plane (GLfloat a, GLfloat b, GLfloat c, GLfloat d)
157	root	1.9	: n (vec3 (a,b,c))
158	root	1.7	{
159			GLfloat s = 1. / abs (n);
160
161			n = n * s;
162	root	1.9	this->d = d * s;
163	root	1.7	}
164
165			/////////////////////////////////////////////////////////////////////////////
166
167	root	1.1	void box::add (const box &o)
168			{
169			a.x = min (a.x, o.a.x);
170			a.y = min (a.y, o.a.y);
171			a.z = min (a.z, o.a.z);
172			b.x = max (b.x, o.b.x);
173			b.y = max (b.y, o.b.y);
174			b.z = max (b.z, o.b.z);
175			}
176
177	root	1.19	void box::add (const point &p)
178	root	1.1	{
179			a.x = min (a.x, p.x);
180			a.y = min (a.y, p.y);
181			a.z = min (a.z, p.z);
182			b.x = max (b.x, p.x);
183			b.y = max (b.y, p.y);
184			b.z = max (b.z, p.z);
185	root	1.5	}
186
187	root	1.7	/////////////////////////////////////////////////////////////////////////////
188	root	1.4
189			struct timer timer;
190			static double base;
191			double timer::now = 0.;
192			double timer::diff;
193
194			void timer::frame ()
195			{
196			struct timeval tv;
197			gettimeofday (&tv, 0);
198
199			double next = tv.tv_sec - base + tv.tv_usec / 1.e6;
200
201			diff = next - now;
202			now = next;
203			}
204
205			timer::timer ()
206			{
207			struct timeval tv;
208			gettimeofday (&tv, 0);
209			base = tv.tv_sec + tv.tv_usec / 1.e6;
210			}
211
212	root	1.13	GLuint SDL_GL_LoadTexture (SDL_Surface * surface, GLfloat * texcoord)
213			{
214			GLuint texture;
215			int w, h;
216			SDL_Surface *image;
217			SDL_Rect area;
218			Uint32 saved_flags;
219			Uint8 saved_alpha;
220
221			/* Use the surface width and height expanded to powers of 2 */
222	root	1.14	//w = power_of_two (surface->w);
223			//h = power_of_two (surface->h);
224	root	1.13	w = power_of_two (surface->w);
225			h = power_of_two (surface->h);
226			texcoord[0] = 0.0f; /* Min X */
227			texcoord[1] = 0.0f; /* Min Y */
228			texcoord[2] = (GLfloat) surface->w / w; /* Max X */
229			texcoord[3] = (GLfloat) surface->h / h; /* Max Y */
230
231			image = SDL_CreateRGBSurface (SDL_SWSURFACE, w, h, 32,
232			#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */
233			0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
234			#else
235			0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF
236			#endif
237			);
238			if (image == NULL)
239			{
240			return 0;
241			}
242
243			/* Save the alpha blending attributes */
244			saved_flags = surface->flags & (SDL_SRCALPHA \| SDL_RLEACCELOK);
245			saved_alpha = surface->format->alpha;
246			if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
247			{
248			SDL_SetAlpha (surface, 0, 0);
249			}
250
251			/* Copy the surface into the GL texture image */
252			area.x = 0;
253			area.y = 0;
254			area.w = surface->w;
255			area.h = surface->h;
256			SDL_BlitSurface (surface, &area, image, &area);
257
258			/* Restore the alpha blending attributes */
259			if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
260			{
261			SDL_SetAlpha (surface, saved_flags, saved_alpha);
262			}
263
264			/* Create an OpenGL texture for the image */
265			glGenTextures (1, &texture);
266			glBindTexture (GL_TEXTURE_2D, texture);
267			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
268			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
269			glTexImage2D (GL_TEXTURE_2D,
270			0,
271			GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
272			SDL_FreeSurface (image); /* No longer needed */
273
274			return texture;
275	root	1.15	}
276	root	1.13
277	root	1.10	//skedjuhlar main_scheduler;
278	root	1.17