libgender/util.C

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

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

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

#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.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;
//double min_frame = 1. / 60.;
double min_frame = 1. / 600.;

void timer::frame ()
{
  struct timeval tv;
  double next;

  for (;;)
    {
      gettimeofday (&tv, 0);

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

      if (diff >= min_frame)
        break;

      SDL_Delay ((unsigned int)((min_frame - diff) * 1000.));
    }

  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;
}

void render_text (GLint x, GLint y, const char *str)
{
  glRasterPos2i (x, y);

  while (!*str)
    glutBitmapCharacter (GLUT_BITMAP_HELVETICA_18, *str++);
}

namespace gl {

  void draw_box (const view &ctx, const sector &a, const sector &b)
  {
    int i;
    static GLint verts[] = {
       0x8000, 0x8004, 0x8006, 0x8002,  // -x
       0x8001, 0x8003, 0x8007, 0x8005,  // +x
       0x8000, 0x8001, 0x8005, 0x8004,  // -y
       0x8007, 0x8003, 0x8002, 0x8006,  // +y
       0x8000, 0x8002, 0x8003, 0x8001,  // -z
       0x8004, 0x8005, 0x8007, 0x8006,  // +z
       0
    };

    glBegin (GL_QUADS);

    for (GLint *v = verts; *v; v++)
      {
        GLint mask = *v;

        glVertex3i (mask & 1 ? b.x : a.x,
                    mask & 2 ? b.y : a.y,
                    mask & 4 ? b.z : a.z);
      }

    glEnd ();
  }

  int nesting;

  void errchk (const char *name, const char *args, const char *file, int line)
  {
    static int inbegin;

    if (name[2] == 'B' && !strcmp (name, "glBegin"))
      inbegin = 1;
    else if (name[2] == 'E' && !strcmp (name, "glEnd"))
      inbegin = 0;

    if (inbegin)
      return;

    GLenum gl_derror = glGetError ();
    if (gl_derror != GL_NO_ERROR)
      fprintf (stderr, "%s:%d [GLERROR %d,%s] %s(%s)\n",
               file, line, gl_derror, gluErrorString (gl_derror), name, args);
  }

}

//skedjuhlar main_scheduler;

Revision:	1.25
Committed:	Sat Oct 9 23:12:07 2004 UTC (19 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.24:	+16 -2 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	1.25	#include <cstring>
8	root	1.1	#include <cmath>
9
10	root	1.4	#include <sys/time.h>
11			#include <time.h>
12	root	1.20
13	root	1.15	#include <GL/gl.h>
14	root	1.25	#include <GL/glu.h>
15	root	1.20	#include <GL/glut.h>
16	root	1.2
17	root	1.1	#include "util.h"
18	root	1.15	#include "entity.h"
19	root	1.1
20	root	1.3	#define DEG2RAD (M_PI / 180.)
21
22	root	1.6	void renormalize (sector &s, point &p)
23			{
24			float i;
25
26	root	1.11	p.x = modff (p.x, &i); s.x += (soffs)i;
27			p.y = modff (p.y, &i); s.y += (soffs)i;
28			p.z = modff (p.z, &i); s.z += (soffs)i;
29	root	1.6	}
30
31	root	1.7	/////////////////////////////////////////////////////////////////////////////
32
33	root	1.1	const vec3 normalize (const vec3 &v)
34			{
35	root	1.3	GLfloat s = abs (v);
36
37			if (!s)
38			return v;
39	root	1.1
40	root	1.3	s = 1. / s;
41	root	1.1	return vec3 (v.x * s, v.y * s, v.z * s);
42			}
43
44			const vec3 cross (const vec3 &a, const vec3 &b)
45			{
46			return vec3 (
47	root	1.3	a.y * b.z - a.z * b.y,
48			a.z * b.x - a.x * b.z,
49			a.x * b.y - a.y * b.x
50			);
51	root	1.2	}
52
53	root	1.7	/////////////////////////////////////////////////////////////////////////////
54
55	root	1.12	void matrix::diagonal (GLfloat v)
56	root	1.2	{
57			for (int i = 4; i--; )
58			for (int j = 4; j--; )
59			data[i][j] = i == j ? v : 0.;
60			}
61
62	root	1.12	const matrix operator *(const matrix &a, const matrix &b)
63	root	1.2	{
64	root	1.12	matrix r;
65	root	1.2
66	root	1.3	// taken from mesa
67			for (int i = 0; i < 4; i++)
68			{
69			const GLfloat ai0=a(i,0), ai1=a(i,1), ai2=a(i,2), ai3=a(i,3);
70
71			r(i,0) = ai0 * b(0,0) + ai1 * b(1,0) + ai2 * b(2,0) + ai3 * b(3,0);
72			r(i,1) = ai0 * b(0,1) + ai1 * b(1,1) + ai2 * b(2,1) + ai3 * b(3,1);
73			r(i,2) = ai0 * b(0,2) + ai1 * b(1,2) + ai2 * b(2,2) + ai3 * b(3,2);
74			r(i,3) = ai0 * b(0,3) + ai1 * b(1,3) + ai2 * b(2,3) + ai3 * b(3,3);
75			}
76	root	1.2
77	root	1.3	return r;
78			}
79	root	1.2
80	root	1.12	const matrix matrix::rotation (GLfloat angle, const vec3 &axis)
81	root	1.3	{
82			GLfloat xx, yy, zz, xy, yz, zx, xs, ys, zs, one_c, s, c;
83	root	1.2
84	root	1.3	s = (GLfloat) sinf (angle * DEG2RAD);
85			c = (GLfloat) cosf (angle * DEG2RAD);
86
87			const GLfloat mag = abs (axis);
88
89			if (mag <= 1.0e-4)
90	root	1.12	return matrix (1);
91	root	1.3
92	root	1.12	matrix m;
93	root	1.3	const vec3 n = axis * (1. / mag);
94
95			xx = n.x * n.x;
96			yy = n.y * n.y;
97			zz = n.z * n.z;
98			xy = n.x * n.y;
99			yz = n.y * n.z;
100			zx = n.z * n.x;
101			xs = n.x * s;
102			ys = n.y * s;
103			zs = n.z * s;
104			one_c = 1.0F - c;
105
106			m(0,0) = (one_c * xx) + c;
107			m(0,1) = (one_c * xy) - zs;
108			m(0,2) = (one_c * zx) + ys;
109			m(0,3) = 0;
110
111			m(1,0) = (one_c * xy) + zs;
112			m(1,1) = (one_c * yy) + c;
113			m(1,2) = (one_c * yz) - xs;
114			m(1,3) = 0;
115
116			m(2,0) = (one_c * zx) - ys;
117			m(2,1) = (one_c * yz) + xs;
118			m(2,2) = (one_c * zz) + c;
119			m(2,3) = 0;
120
121			m(3,0) = 0;
122			m(3,1) = 0;
123			m(3,2) = 0;
124			m(3,3) = 1;
125
126	root	1.9	return m;
127	root	1.3	}
128
129	root	1.12	const vec3 operator *(const matrix &a, const vec3 &v)
130	root	1.3	{
131			return vec3 (
132	root	1.9	a(0,0) * v.x + a(0,1) * v.y + a(0,2) * v.z + a(0,3),
133			a(1,0) * v.x + a(1,1) * v.y + a(1,2) * v.z + a(1,3),
134			a(2,0) * v.x + a(2,1) * v.y + a(2,2) * v.z + a(2,3)
135	root	1.3	);
136	root	1.2	}
137
138	root	1.12	void matrix::print ()
139	root	1.2	{
140			printf ("\n");
141			printf ("[ %f, %f, %f, %f ]\n", data[0][0], data[1][0], data[2][0], data[3][0]);
142			printf ("[ %f, %f, %f, %f ]\n", data[0][1], data[1][1], data[2][1], data[3][1]);
143			printf ("[ %f, %f, %f, %f ]\n", data[0][2], data[1][2], data[2][2], data[3][2]);
144			printf ("[ %f, %f, %f, %f ]\n", data[0][3], data[1][3], data[2][3], data[3][3]);
145			}
146
147	root	1.12	const matrix matrix::translation (const vec3 &v)
148	root	1.2	{
149	root	1.12	matrix m(1);
150	root	1.2
151	root	1.9	m(0,3) = v.x;
152			m(1,3) = v.y;
153			m(2,3) = v.z;
154	root	1.2
155	root	1.9	return m;
156	root	1.1	}
157
158	root	1.7	/////////////////////////////////////////////////////////////////////////////
159
160			plane::plane (GLfloat a, GLfloat b, GLfloat c, GLfloat d)
161	root	1.9	: n (vec3 (a,b,c))
162	root	1.7	{
163			GLfloat s = 1. / abs (n);
164
165			n = n * s;
166	root	1.9	this->d = d * s;
167	root	1.7	}
168
169			/////////////////////////////////////////////////////////////////////////////
170
171	root	1.1	void box::add (const box &o)
172			{
173			a.x = min (a.x, o.a.x);
174			a.y = min (a.y, o.a.y);
175			a.z = min (a.z, o.a.z);
176			b.x = max (b.x, o.b.x);
177			b.y = max (b.y, o.b.y);
178			b.z = max (b.z, o.b.z);
179			}
180
181	root	1.19	void box::add (const point &p)
182	root	1.1	{
183			a.x = min (a.x, p.x);
184			a.y = min (a.y, p.y);
185			a.z = min (a.z, p.z);
186			b.x = max (b.x, p.x);
187			b.y = max (b.y, p.y);
188			b.z = max (b.z, p.z);
189	root	1.5	}
190
191	root	1.7	/////////////////////////////////////////////////////////////////////////////
192	root	1.4
193			struct timer timer;
194			static double base;
195			double timer::now = 0.;
196			double timer::diff;
197	root	1.24	//double min_frame = 1. / 60.;
198			double min_frame = 1. / 600.;
199	root	1.4
200			void timer::frame ()
201			{
202			struct timeval tv;
203	root	1.23	double next;
204	root	1.4
205	root	1.23	for (;;)
206			{
207			gettimeofday (&tv, 0);
208
209			next = tv.tv_sec - base + tv.tv_usec / 1.e6;
210			diff = next - now;
211
212			if (diff >= min_frame)
213			break;
214
215			SDL_Delay ((unsigned int)((min_frame - diff) * 1000.));
216			}
217	root	1.4
218			now = next;
219			}
220
221			timer::timer ()
222			{
223			struct timeval tv;
224			gettimeofday (&tv, 0);
225			base = tv.tv_sec + tv.tv_usec / 1.e6;
226			}
227
228	root	1.13	GLuint SDL_GL_LoadTexture (SDL_Surface * surface, GLfloat * texcoord)
229			{
230			GLuint texture;
231			int w, h;
232			SDL_Surface *image;
233			SDL_Rect area;
234			Uint32 saved_flags;
235			Uint8 saved_alpha;
236
237			/* Use the surface width and height expanded to powers of 2 */
238	root	1.14	//w = power_of_two (surface->w);
239			//h = power_of_two (surface->h);
240	root	1.13	w = power_of_two (surface->w);
241			h = power_of_two (surface->h);
242			texcoord[0] = 0.0f; /* Min X */
243			texcoord[1] = 0.0f; /* Min Y */
244			texcoord[2] = (GLfloat) surface->w / w; /* Max X */
245			texcoord[3] = (GLfloat) surface->h / h; /* Max Y */
246
247			image = SDL_CreateRGBSurface (SDL_SWSURFACE, w, h, 32,
248			#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */
249			0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
250			#else
251			0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF
252			#endif
253			);
254			if (image == NULL)
255			{
256			return 0;
257			}
258
259			/* Save the alpha blending attributes */
260			saved_flags = surface->flags & (SDL_SRCALPHA \| SDL_RLEACCELOK);
261			saved_alpha = surface->format->alpha;
262			if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
263			{
264			SDL_SetAlpha (surface, 0, 0);
265			}
266
267			/* Copy the surface into the GL texture image */
268			area.x = 0;
269			area.y = 0;
270			area.w = surface->w;
271			area.h = surface->h;
272			SDL_BlitSurface (surface, &area, image, &area);
273
274			/* Restore the alpha blending attributes */
275			if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
276			{
277			SDL_SetAlpha (surface, saved_flags, saved_alpha);
278			}
279
280			/* Create an OpenGL texture for the image */
281			glGenTextures (1, &texture);
282			glBindTexture (GL_TEXTURE_2D, texture);
283			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
284			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
285			glTexImage2D (GL_TEXTURE_2D,
286			0,
287			GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
288			SDL_FreeSurface (image); /* No longer needed */
289
290			return texture;
291	root	1.20	}
292
293			void render_text (GLint x, GLint y, const char *str)
294			{
295			glRasterPos2i (x, y);
296
297			while (!*str)
298			glutBitmapCharacter (GLUT_BITMAP_HELVETICA_18, *str++);
299	root	1.15	}
300	root	1.13
301	root	1.21	namespace gl {
302
303	root	1.24	void draw_box (const view &ctx, const sector &a, const sector &b)
304			{
305			int i;
306			static GLint verts[] = {
307			0x8000, 0x8004, 0x8006, 0x8002, // -x
308			0x8001, 0x8003, 0x8007, 0x8005, // +x
309			0x8000, 0x8001, 0x8005, 0x8004, // -y
310			0x8007, 0x8003, 0x8002, 0x8006, // +y
311			0x8000, 0x8002, 0x8003, 0x8001, // -z
312			0x8004, 0x8005, 0x8007, 0x8006, // +z
313			0
314			};
315
316			glBegin (GL_QUADS);
317
318			for (GLint v = verts; v; v++)
319			{
320			GLint mask = *v;
321
322			glVertex3i (mask & 1 ? b.x : a.x,
323			mask & 2 ? b.y : a.y,
324			mask & 4 ? b.z : a.z);
325			}
326
327			glEnd ();
328			}
329
330	root	1.25	int nesting;
331
332	root	1.24	void errchk (const char name, const char args, const char *file, int line)
333			{
334	root	1.25	static int inbegin;
335
336			if (name[2] == 'B' && !strcmp (name, "glBegin"))
337			inbegin = 1;
338			else if (name[2] == 'E' && !strcmp (name, "glEnd"))
339			inbegin = 0;
340
341			if (inbegin)
342			return;
343
344	root	1.24	GLenum gl_derror = glGetError ();
345			if (gl_derror != GL_NO_ERROR)
346	root	1.25	fprintf (stderr, "%s:%d [GLERROR %d,%s] %s(%s)\n",
347			file, line, gl_derror, gluErrorString (gl_derror), name, args);
348	root	1.24	}
349	root	1.21
350			}
351
352	root	1.10	//skedjuhlar main_scheduler;
353	root	1.17