progs/demos/tunnel.c

   1 /*
   2  * This program is under the GNU GPL.
   3  * Use at your own risk.
   4  *
   5  * written by David Bucciarelli (tech.hmw@plus.it)
   6  *            Humanware s.r.l.
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <math.h>
  12 #include <string.h>
  13
  14 #ifdef WIN32
  15 #include <windows.h>
  16 #endif
  17
  18 #include <GL/glut.h>
  19 #include "readtex.h"
  20 #include "tunneldat.h"
  21
  22 #ifdef XMESA
  23 #include "GL/xmesa.h"
  24 static int fullscreen = 1;
  25 #endif
  26
  27 static int WIDTH = 640;
  28 static int HEIGHT = 480;
  29
  30 static GLint T0 = 0;
  31 static GLint Frames = 0;
  32 static GLint NiceFog = 1;
  33
  34 #define NUMBLOC 5
  35
  36 #ifndef M_PI
  37 #define M_PI 3.1415926535
  38 #endif
  39
  40 /*
  41 extern int striplength_skin_13[];
  42 extern float stripdata_skin_13[];
  43
  44 extern int striplength_skin_12[];
  45 extern float stripdata_skin_12[];
  46
  47 extern int striplength_skin_11[];
  48 extern float stripdata_skin_11[];
  49
  50 extern int striplength_skin_9[];
  51 extern float stripdata_skin_9[];
  52 */
  53
  54 static int win = 0;
  55
  56 static float obs[3] = { 1000.0, 0.0, 2.0 };
  57 static float dir[3];
  58 static float v = 30.;
  59 static float alpha = 90.0;
  60 static float beta = 90.0;
  61
  62 static int fog = 1;
  63 static int bfcull = 1;
  64 static int usetex = 1;
  65 static int cstrip = 0;
  66 static int help = 1;
  67 static int joyavailable = 0;
  68 static int joyactive = 0;
  69
  70 static GLuint t1id, t2id;
  71
  72 static void
  73 inittextures(void)
  74 {
  75    glGenTextures(1, &t1id);
  76    glBindTexture(GL_TEXTURE_2D, t1id);
  77
  78    if (!LoadRGBMipmaps("../images/tile.rgb", GL_RGB)) {
  79       fprintf(stderr, "Error reading a texture.\n");
  80       exit(-1);
  81    }
  82
  83    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
  84    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
  85
  86    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
  87                    GL_LINEAR_MIPMAP_NEAREST);
  88    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  89
  90    glGenTextures(1, &t2id);
  91    glBindTexture(GL_TEXTURE_2D, t2id);
  92
  93    if (!LoadRGBMipmaps("../images/bw.rgb", GL_RGB)) {
  94       fprintf(stderr, "Error reading a texture.\n");
  95       exit(-1);
  96    }
  97
  98    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
  99    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 100
 101    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 102                    GL_LINEAR_MIPMAP_LINEAR);
 103    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 104
 105    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 106 }
 107
 108 static void
 109 drawobjs(const int *l, const float *f)
 110 {
 111    int mend, j;
 112
 113    if (cstrip) {
 114       float r = 0.33, g = 0.33, b = 0.33;
 115
 116       for (; (*l) != 0;) {
 117          mend = *l++;
 118
 119          r += 0.33;
 120          if (r > 1.0) {
 121             r = 0.33;
 122             g += 0.33;
 123             if (g > 1.0) {
 124                g = 0.33;
 125                b += 0.33;
 126                if (b > 1.0)
 127                   b = 0.33;
 128             }
 129          }
 130
 131          glColor3f(r, g, b);
 132          glBegin(GL_TRIANGLE_STRIP);
 133          for (j = 0; j < mend; j++) {
 134             f += 4;
 135             glTexCoord2fv(f);
 136             f += 2;
 137             glVertex3fv(f);
 138             f += 3;
 139          }
 140          glEnd();
 141       }
 142    }
 143    else
 144       for (; (*l) != 0;) {
 145          mend = *l++;
 146
 147          glBegin(GL_TRIANGLE_STRIP);
 148          for (j = 0; j < mend; j++) {
 149             glColor4fv(f);
 150             f += 4;
 151             glTexCoord2fv(f);
 152             f += 2;
 153             glVertex3fv(f);
 154             f += 3;
 155          }
 156          glEnd();
 157       }
 158 }
 159
 160 static void
 161 calcposobs(void)
 162 {
 163    static double t0 = -1.;
 164    double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
 165    if (t0 < 0.0)
 166       t0 = t;
 167    dt = t - t0;
 168    t0 = t;
 169
 170    dir[0] = sin(alpha * M_PI / 180.0);
 171    dir[1] = cos(alpha * M_PI / 180.0) * sin(beta * M_PI / 180.0);
 172    dir[2] = cos(beta * M_PI / 180.0);
 173
 174    if (dir[0] < 1.0e-5 && dir[0] > -1.0e-5)
 175       dir[0] = 0;
 176    if (dir[1] < 1.0e-5 && dir[1] > -1.0e-5)
 177       dir[1] = 0;
 178    if (dir[2] < 1.0e-5 && dir[2] > -1.0e-5)
 179       dir[2] = 0;
 180
 181    obs[0] += v * dir[0] * dt;
 182    obs[1] += v * dir[1] * dt;
 183    obs[2] += v * dir[2] * dt;
 184 }
 185
 186 static void
 187 special(int k, int x, int y)
 188 {
 189    switch (k) {
 190    case GLUT_KEY_LEFT:
 191       alpha -= 2.0;
 192       break;
 193    case GLUT_KEY_RIGHT:
 194       alpha += 2.0;
 195       break;
 196    case GLUT_KEY_DOWN:
 197       beta -= 2.0;
 198       break;
 199    case GLUT_KEY_UP:
 200       beta += 2.0;
 201       break;
 202    }
 203 }
 204
 205 static void
 206 cleanup(void)
 207 {
 208    glDeleteTextures(1, &t1id);
 209    glDeleteTextures(1, &t2id);
 210 }
 211
 212 static void
 213 key(unsigned char k, int x, int y)
 214 {
 215    switch (k) {
 216    case 27:
 217       cleanup();
 218       exit(0);
 219       break;
 220
 221    case 'a':
 222       v += 5.;
 223       break;
 224    case 'z':
 225       v -= 5.;
 226       break;
 227
 228 #ifdef XMESA
 229    case ' ':
 230       fullscreen = (!fullscreen);
 231       XMesaSetFXmode(fullscreen ? XMESA_FX_FULLSCREEN : XMESA_FX_WINDOW);
 232       break;
 233 #endif
 234    case 'j':
 235       joyactive = (!joyactive);
 236       break;
 237    case 'h':
 238       help = (!help);
 239       break;
 240    case 'f':
 241       fog = (!fog);
 242       break;
 243    case 't':
 244       usetex = (!usetex);
 245       break;
 246    case 'b':
 247       if (bfcull) {
 248          glDisable(GL_CULL_FACE);
 249          bfcull = 0;
 250       }
 251       else {
 252          glEnable(GL_CULL_FACE);
 253          bfcull = 1;
 254       }
 255       break;
 256    case 'm':
 257       cstrip = (!cstrip);
 258       break;
 259
 260    case 'd':
 261       fprintf(stderr, "Deleting textures...\n");
 262       glDeleteTextures(1, &t1id);
 263       glDeleteTextures(1, &t2id);
 264       fprintf(stderr, "Loading textures...\n");
 265       inittextures();
 266       fprintf(stderr, "Done.\n");
 267       break;
 268    case 'n':
 269       NiceFog = !NiceFog;
 270       printf("NiceFog %d\n", NiceFog);
 271       break;
 272    }
 273    glutPostRedisplay();
 274 }
 275
 276 static void
 277 reshape(int w, int h)
 278 {
 279    WIDTH = w;
 280    HEIGHT = h;
 281    glMatrixMode(GL_PROJECTION);
 282    glLoadIdentity();
 283    gluPerspective(80.0, w / (float) h, 1.0, 50.0);
 284    glMatrixMode(GL_MODELVIEW);
 285    glLoadIdentity();
 286    glViewport(0, 0, w, h);
 287 }
 288
 289 static void
 290 printstring(void *font, char *string)
 291 {
 292    int len, i;
 293
 294    len = (int) strlen(string);
 295    for (i = 0; i < len; i++)
 296       glutBitmapCharacter(font, string[i]);
 297 }
 298
 299 static void
 300 printhelp(void)
 301 {
 302    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 303    glColor4f(0.0, 0.0, 0.0, 0.5);
 304    glRecti(40, 40, 600, 440);
 305
 306    glColor3f(1.0, 0.0, 0.0);
 307    glRasterPos2i(300, 420);
 308    printstring(GLUT_BITMAP_TIMES_ROMAN_24, "Help");
 309
 310    glRasterPos2i(60, 390);
 311    printstring(GLUT_BITMAP_TIMES_ROMAN_24, "h - Toggle Help");
 312    glRasterPos2i(60, 360);
 313    printstring(GLUT_BITMAP_TIMES_ROMAN_24, "t - Toggle Textures");
 314    glRasterPos2i(60, 330);
 315    printstring(GLUT_BITMAP_TIMES_ROMAN_24, "f - Toggle Fog");
 316    glRasterPos2i(60, 300);
 317    printstring(GLUT_BITMAP_TIMES_ROMAN_24, "m - Toggle strips");
 318    glRasterPos2i(60, 270);
 319    printstring(GLUT_BITMAP_TIMES_ROMAN_24, "b - Toggle Back face culling");
 320    glRasterPos2i(60, 240);
 321    printstring(GLUT_BITMAP_TIMES_ROMAN_24, "Arrow Keys - Rotate");
 322    glRasterPos2i(60, 210);
 323    printstring(GLUT_BITMAP_TIMES_ROMAN_24, "a - Increase velocity");
 324    glRasterPos2i(60, 180);
 325    printstring(GLUT_BITMAP_TIMES_ROMAN_24, "z - Decrease velocity");
 326
 327    glRasterPos2i(60, 150);
 328    if (joyavailable)
 329       printstring(GLUT_BITMAP_TIMES_ROMAN_24,
 330                   "j - Toggle jostick control (Joystick control available)");
 331    else
 332       printstring(GLUT_BITMAP_TIMES_ROMAN_24,
 333                   "(No Joystick control available)");
 334 }
 335
 336 static void
 337 dojoy(void)
 338 {
 339 #ifdef WIN32
 340    static UINT max[2] = { 0, 0 };
 341    static UINT min[2] = { 0xffffffff, 0xffffffff }, center[2];
 342    MMRESULT res;
 343    JOYINFO joy;
 344
 345    res = joyGetPos(JOYSTICKID1, &joy);
 346
 347    if (res == JOYERR_NOERROR) {
 348       joyavailable = 1;
 349
 350       if (max[0] < joy.wXpos)
 351          max[0] = joy.wXpos;
 352       if (min[0] > joy.wXpos)
 353          min[0] = joy.wXpos;
 354       center[0] = (max[0] + min[0]) / 2;
 355
 356       if (max[1] < joy.wYpos)
 357          max[1] = joy.wYpos;
 358       if (min[1] > joy.wYpos)
 359          min[1] = joy.wYpos;
 360       center[1] = (max[1] + min[1]) / 2;
 361
 362       if (joyactive) {
 363          if (fabs(center[0] - (float) joy.wXpos) > 0.1 * (max[0] - min[0]))
 364             alpha -=
 365                2.0 * (center[0] - (float) joy.wXpos) / (max[0] - min[0]);
 366          if (fabs(center[1] - (float) joy.wYpos) > 0.1 * (max[1] - min[1]))
 367             beta += 2.0 * (center[1] - (float) joy.wYpos) / (max[1] - min[1]);
 368
 369          if (joy.wButtons & JOY_BUTTON1)
 370             v += 0.01;
 371          if (joy.wButtons & JOY_BUTTON2)
 372             v -= 0.01;
 373       }
 374    }
 375    else
 376       joyavailable = 0;
 377 #endif
 378 }
 379
 380 static void
 381 draw(void)
 382 {
 383    static char frbuf[80] = "";
 384    int i;
 385    float base, offset;
 386
 387    if (NiceFog)
 388       glHint(GL_FOG_HINT, GL_NICEST);
 389    else
 390       glHint(GL_FOG_HINT, GL_DONT_CARE);
 391
 392    dojoy();
 393
 394    glClear(GL_COLOR_BUFFER_BIT);
 395
 396    if (usetex)
 397       glEnable(GL_TEXTURE_2D);
 398    else
 399       glDisable(GL_TEXTURE_2D);
 400
 401    if (fog)
 402       glEnable(GL_FOG);
 403    else
 404       glDisable(GL_FOG);
 405
 406    glShadeModel(GL_SMOOTH);
 407
 408    glPushMatrix();
 409    calcposobs();
 410    gluLookAt(obs[0], obs[1], obs[2],
 411              obs[0] + dir[0], obs[1] + dir[1], obs[2] + dir[2],
 412              0.0, 0.0, 1.0);
 413
 414    if (dir[0] > 0) {
 415       offset = 8.0;
 416       base = obs[0] - fmod(obs[0], 8.0);
 417    }
 418    else {
 419       offset = -8.0;
 420       base = obs[0] + (8.0 - fmod(obs[0], 8.0));
 421    }
 422
 423    glPushMatrix();
 424    glTranslatef(base - offset / 2.0, 0.0, 0.0);
 425    for (i = 0; i < NUMBLOC; i++) {
 426       glTranslatef(offset, 0.0, 0.0);
 427       glBindTexture(GL_TEXTURE_2D, t1id);
 428       drawobjs(striplength_skin_11, stripdata_skin_11);
 429       glBindTexture(GL_TEXTURE_2D, t2id);
 430       drawobjs(striplength_skin_12, stripdata_skin_12);
 431       drawobjs(striplength_skin_9, stripdata_skin_9);
 432       drawobjs(striplength_skin_13, stripdata_skin_13);
 433    }
 434    glPopMatrix();
 435    glPopMatrix();
 436
 437    glDisable(GL_TEXTURE_2D);
 438    glDisable(GL_FOG);
 439    glShadeModel(GL_FLAT);
 440
 441    glMatrixMode(GL_PROJECTION);
 442    glPushMatrix();
 443    glLoadIdentity();
 444    glOrtho(-0.5, 639.5, -0.5, 479.5, -1.0, 1.0);
 445
 446    glMatrixMode(GL_MODELVIEW);
 447    glLoadIdentity();
 448
 449    glColor3f(1.0, 0.0, 0.0);
 450    glRasterPos2i(10, 10);
 451    printstring(GLUT_BITMAP_HELVETICA_18, frbuf);
 452    glRasterPos2i(350, 470);
 453    printstring(GLUT_BITMAP_HELVETICA_10,
 454                "Tunnel V1.5 Written by David Bucciarelli (tech.hmw@plus.it)");
 455
 456    if (help)
 457       printhelp();
 458
 459    glMatrixMode(GL_PROJECTION);
 460    glPopMatrix();
 461    glMatrixMode(GL_MODELVIEW);
 462
 463    glutSwapBuffers();
 464
 465    Frames++;
 466    {
 467       GLint t = glutGet(GLUT_ELAPSED_TIME);
 468       if (t - T0 >= 2000) {
 469          GLfloat seconds = (t - T0) / 1000.0;
 470          GLfloat fps = Frames / seconds;
 471          sprintf(frbuf, "Frame rate: %f", fps);
 472          T0 = t;
 473          Frames = 0;
 474       }
 475    }
 476 }
 477
 478 static void
 479 idle(void)
 480 {
 481    glutPostRedisplay();
 482 }
 483
 484
 485
 486 int
 487 main(int ac, char **av)
 488 {
 489    float fogcolor[4] = { 0.7, 0.7, 0.7, 1.0 };
 490
 491    fprintf(stderr,
 492            "Tunnel V1.5\nWritten by David Bucciarelli (tech.hmw@plus.it)\n");
 493
 494    glutInitWindowPosition(0, 0);
 495    glutInitWindowSize(WIDTH, HEIGHT);
 496    glutInit(&ac, av);
 497
 498    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
 499
 500    if (!(win = glutCreateWindow("Tunnel"))) {
 501       fprintf(stderr, "Error, couldn't open window\n");
 502       return -1;
 503    }
 504
 505    glMatrixMode(GL_PROJECTION);
 506    glLoadIdentity();
 507    gluPerspective(80.0, WIDTH / (float) HEIGHT, 1.0, 50.0);
 508
 509    glMatrixMode(GL_MODELVIEW);
 510
 511    glShadeModel(GL_SMOOTH);
 512    glDisable(GL_DEPTH_TEST);
 513    glEnable(GL_CULL_FACE);
 514    glEnable(GL_TEXTURE_2D);
 515
 516    glEnable(GL_FOG);
 517    glFogi(GL_FOG_MODE, GL_EXP2);
 518    glFogfv(GL_FOG_COLOR, fogcolor);
 519
 520    glFogf(GL_FOG_DENSITY, 0.06);
 521    glHint(GL_FOG_HINT, GL_NICEST);
 522
 523    inittextures();
 524
 525    glClearColor(fogcolor[0], fogcolor[1], fogcolor[2], fogcolor[3]);
 526    glClear(GL_COLOR_BUFFER_BIT);
 527
 528    calcposobs();
 529
 530    glutReshapeFunc(reshape);
 531    glutDisplayFunc(draw);
 532    glutKeyboardFunc(key);
 533    glutSpecialFunc(special);
 534    glutIdleFunc(idle);
 535
 536    glEnable(GL_BLEND);
 537    /*glBlendFunc(GL_SRC_ALPHA_SATURATE,GL_ONE); */
 538    /*glEnable(GL_POLYGON_SMOOTH); */
 539
 540    glutMainLoop();
 541
 542    cleanup();
 543    return 0;
 544 }