progs/samples/prim.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <GL/glut.h>
   5
   6
   7 #define PIXEL_CENTER(x) ((long)(x) + 0.5)
   8
   9 #define GAP 10
  10 #define ROWS 3
  11 #define COLS 4
  12
  13 #define OPENGL_WIDTH 48
  14 #define OPENGL_HEIGHT 13
  15
  16
  17 GLenum rgb, doubleBuffer, windType;
  18 GLint windW, windH;
  19
  20 GLenum mode1, mode2;
  21 GLint boxW, boxH;
  22 GLubyte OpenGL_bits[] = {
  23    0x00, 0x03, 0x00, 0x00, 0x00, 0x00,
  24    0x7f, 0xfb, 0xff, 0xff, 0xff, 0x01,
  25    0x7f, 0xfb, 0xff, 0xff, 0xff, 0x01,
  26    0x00, 0x03, 0x00, 0x00, 0x00, 0x00,
  27    0x3e, 0x8f, 0xb7, 0xf9, 0xfc, 0x01,
  28    0x63, 0xdb, 0xb0, 0x8d, 0x0d, 0x00,
  29    0x63, 0xdb, 0xb7, 0x8d, 0x0d, 0x00,
  30    0x63, 0xdb, 0xb6, 0x8d, 0x0d, 0x00,
  31    0x63, 0x8f, 0xf3, 0xcc, 0x0d, 0x00,
  32    0x63, 0x00, 0x00, 0x0c, 0x4c, 0x0a,
  33    0x63, 0x00, 0x00, 0x0c, 0x4c, 0x0e,
  34    0x63, 0x00, 0x00, 0x8c, 0xed, 0x0e,
  35    0x3e, 0x00, 0x00, 0xf8, 0x0c, 0x00,
  36 };
  37
  38
  39 #include "tkmap.c"
  40
  41 static void Init(void)
  42 {
  43
  44     mode1 = GL_TRUE;
  45     mode2 = GL_TRUE;
  46 }
  47
  48 static void Reshape(int width, int height)
  49 {
  50
  51     windW = (GLint)width;
  52     windH = (GLint)height;
  53 }
  54
  55 static void RotateColorMask(void)
  56 {
  57     static GLint rotation = 0;
  58
  59     rotation = (rotation + 1) & 0x3;
  60     switch (rotation) {
  61       case 0:
  62         glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
  63         glIndexMask( 0xff );
  64         break;
  65       case 1:
  66         glColorMask(GL_FALSE, GL_TRUE, GL_TRUE, GL_TRUE);
  67         glIndexMask(0xFE);
  68         break;
  69       case 2:
  70         glColorMask(GL_TRUE, GL_FALSE, GL_TRUE, GL_TRUE);
  71         glIndexMask(0xFD);
  72         break;
  73       case 3:
  74         glColorMask(GL_TRUE, GL_TRUE, GL_FALSE, GL_TRUE);
  75         glIndexMask(0xFB);
  76         break;
  77     }
  78 }
  79
  80 static void Key(unsigned char key, int x, int y)
  81 {
  82
  83     switch (key) {
  84       case 27:
  85         exit(1);
  86       case '1':
  87         mode1 = !mode1;
  88         break;
  89       case '2':
  90         mode2 = !mode2;
  91         break;
  92       case '3':
  93         RotateColorMask();
  94         break;
  95       default:
  96         return;
  97     }
  98
  99     glutPostRedisplay();
 100 }
 101
 102 static void Viewport(GLint row, GLint column)
 103 {
 104     GLint x, y;
 105
 106     boxW = (windW - (COLS + 1) * GAP) / COLS;
 107     boxH = (windH - (ROWS + 1) * GAP) / ROWS;
 108
 109     x = GAP + column * (boxW + GAP);
 110     y = GAP + row * (boxH + GAP);
 111
 112     glViewport(x, y, boxW, boxH);
 113
 114     glMatrixMode(GL_PROJECTION);
 115     glLoadIdentity();
 116     glOrtho(-boxW/2, boxW/2, -boxH/2, boxH/2, 0.0, 1.0);
 117     glMatrixMode(GL_MODELVIEW);
 118
 119     glEnable(GL_SCISSOR_TEST);
 120     glScissor(x, y, boxW, boxH);
 121 }
 122
 123 static void Point(void)
 124 {
 125     GLint i;
 126
 127     glBegin(GL_POINTS);
 128         SetColor(COLOR_WHITE);
 129         glVertex2i(0, 0);
 130         for (i = 1; i < 8; i++) {
 131             GLint j = i * 2;
 132             SetColor(COLOR_BLACK+i);
 133             glVertex2i(-j, -j);
 134             glVertex2i(-j, 0);
 135             glVertex2i(-j, j);
 136             glVertex2i(0, j);
 137             glVertex2i(j, j);
 138             glVertex2i(j, 0);
 139             glVertex2i(j, -j);
 140             glVertex2i(0, -j);
 141         }
 142     glEnd();
 143 }
 144
 145 static void Lines(void)
 146 {
 147     GLint i;
 148
 149     glPushMatrix();
 150
 151     glTranslatef(-12, 0, 0);
 152     for (i = 1; i < 8; i++) {
 153         SetColor(COLOR_BLACK+i);
 154         glBegin(GL_LINES);
 155             glVertex2i(-boxW/4, -boxH/4);
 156             glVertex2i(boxW/4, boxH/4);
 157         glEnd();
 158         glTranslatef(4, 0, 0);
 159     }
 160
 161     glPopMatrix();
 162
 163     glBegin(GL_LINES);
 164         glVertex2i(0, 0);
 165     glEnd();
 166 }
 167
 168 static void LineStrip(void)
 169 {
 170
 171     glBegin(GL_LINE_STRIP);
 172         SetColor(COLOR_RED);
 173         glVertex2f(PIXEL_CENTER(-boxW/4), PIXEL_CENTER(-boxH/4));
 174         SetColor(COLOR_GREEN);
 175         glVertex2f(PIXEL_CENTER(-boxW/4), PIXEL_CENTER(boxH/4));
 176         SetColor(COLOR_BLUE);
 177         glVertex2f(PIXEL_CENTER(boxW/4), PIXEL_CENTER(boxH/4));
 178         SetColor(COLOR_WHITE);
 179         glVertex2f(PIXEL_CENTER(boxW/4), PIXEL_CENTER(-boxH/4));
 180     glEnd();
 181
 182     glBegin(GL_LINE_STRIP);
 183         glVertex2i(0, 0);
 184     glEnd();
 185 }
 186
 187 static void LineLoop(void)
 188 {
 189
 190     glBegin(GL_LINE_LOOP);
 191         SetColor(COLOR_RED);
 192         glVertex2f(PIXEL_CENTER(-boxW/4), PIXEL_CENTER(-boxH/4));
 193         SetColor(COLOR_GREEN);
 194         glVertex2f(PIXEL_CENTER(-boxW/4), PIXEL_CENTER(boxH/4));
 195         SetColor(COLOR_BLUE);
 196         glVertex2f(PIXEL_CENTER(boxW/4), PIXEL_CENTER(boxH/4));
 197         SetColor(COLOR_WHITE);
 198         glVertex2f(PIXEL_CENTER(boxW/4), PIXEL_CENTER(-boxH/4));
 199     glEnd();
 200
 201     glEnable(GL_LOGIC_OP);
 202     glLogicOp(GL_XOR);
 203
 204     glEnable(GL_BLEND);
 205     glBlendFunc(GL_ONE, GL_ONE);
 206
 207     SetColor(COLOR_MAGENTA);
 208     glBegin(GL_LINE_LOOP);
 209         glVertex2f(PIXEL_CENTER(-boxW/8), PIXEL_CENTER(-boxH/8));
 210         glVertex2f(PIXEL_CENTER(-boxW/8), PIXEL_CENTER(boxH/8));
 211     glEnd();
 212     glBegin(GL_LINE_LOOP);
 213         glVertex2f(PIXEL_CENTER(-boxW/8), PIXEL_CENTER(boxH/8+5));
 214         glVertex2f(PIXEL_CENTER(boxW/8), PIXEL_CENTER(boxH/8+5));
 215     glEnd();
 216     glDisable(GL_LOGIC_OP);
 217     glDisable(GL_BLEND);
 218
 219     SetColor(COLOR_GREEN);
 220     glBegin(GL_POINTS);
 221         glVertex2i(0, 0);
 222     glEnd();
 223
 224     glBegin(GL_LINE_LOOP);
 225         glVertex2i(0, 0);
 226     glEnd();
 227 }
 228
 229 static void Bitmap(void)
 230 {
 231
 232     glBegin(GL_LINES);
 233         SetColor(COLOR_GREEN);
 234         glVertex2i(-boxW/2, 0);
 235         glVertex2i(boxW/2, 0);
 236         glVertex2i(0, -boxH/2);
 237         glVertex2i(0, boxH/2);
 238         SetColor(COLOR_RED);
 239         glVertex2i(0, -3);
 240         glVertex2i(0, -3+OPENGL_HEIGHT);
 241         SetColor(COLOR_BLUE);
 242         glVertex2i(0, -3);
 243         glVertex2i(OPENGL_WIDTH, -3);
 244     glEnd();
 245
 246     SetColor(COLOR_GREEN);
 247
 248     glPixelStorei(GL_UNPACK_LSB_FIRST, GL_TRUE);
 249     glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 250
 251     glRasterPos2i(0, 0);
 252     glBitmap(OPENGL_WIDTH, OPENGL_HEIGHT, 0, 3, 0.0, 0.0, OpenGL_bits);
 253 }
 254
 255 static void Triangles(void)
 256 {
 257
 258     glBegin(GL_TRIANGLES);
 259         SetColor(COLOR_GREEN);
 260         glVertex2i(-boxW/4, -boxH/4);
 261         SetColor(COLOR_RED);
 262         glVertex2i(-boxW/8, -boxH/16);
 263         SetColor(COLOR_BLUE);
 264         glVertex2i(boxW/8, -boxH/16);
 265
 266         SetColor(COLOR_GREEN);
 267         glVertex2i(-boxW/4, boxH/4);
 268         SetColor(COLOR_RED);
 269         glVertex2i(-boxW/8, boxH/16);
 270         SetColor(COLOR_BLUE);
 271         glVertex2i(boxW/8, boxH/16);
 272     glEnd();
 273
 274     glBegin(GL_TRIANGLES);
 275         glVertex2i(0, 0);
 276         glVertex2i(-100, 100);
 277     glEnd();
 278 }
 279
 280 static void TriangleStrip(void)
 281 {
 282
 283     glBegin(GL_TRIANGLE_STRIP);
 284         SetColor(COLOR_GREEN);
 285         glVertex2i(-boxW/4, -boxH/4);
 286         SetColor(COLOR_RED);
 287         glVertex2i(-boxW/4, boxH/4);
 288         SetColor(COLOR_BLUE);
 289         glVertex2i(0, -boxH/4);
 290         SetColor(COLOR_WHITE);
 291         glVertex2i(0, boxH/4);
 292         SetColor(COLOR_CYAN);
 293         glVertex2i(boxW/4, -boxH/4);
 294         SetColor(COLOR_YELLOW);
 295         glVertex2i(boxW/4, boxH/4);
 296     glEnd();
 297
 298     glBegin(GL_TRIANGLE_STRIP);
 299         glVertex2i(0, 0);
 300         glVertex2i(-100, 100);
 301     glEnd();
 302 }
 303
 304 static void TriangleFan(void)
 305 {
 306     GLint vx[8][2];
 307     GLint x0, y0, x1, y1, x2, y2, x3, y3;
 308     GLint i;
 309
 310     y0 = -boxH/4;
 311     y1 = y0 + boxH/2/3;
 312     y2 = y1 + boxH/2/3;
 313     y3 = boxH/4;
 314     x0 = -boxW/4;
 315     x1 = x0 + boxW/2/3;
 316     x2 = x1 + boxW/2/3;
 317     x3 = boxW/4;
 318
 319     vx[0][0] = x0; vx[0][1] = y1;
 320     vx[1][0] = x0; vx[1][1] = y2;
 321     vx[2][0] = x1; vx[2][1] = y3;
 322     vx[3][0] = x2; vx[3][1] = y3;
 323     vx[4][0] = x3; vx[4][1] = y2;
 324     vx[5][0] = x3; vx[5][1] = y1;
 325     vx[6][0] = x2; vx[6][1] = y0;
 326     vx[7][0] = x1; vx[7][1] = y0;
 327
 328     glBegin(GL_TRIANGLE_FAN);
 329         SetColor(COLOR_WHITE);
 330         glVertex2i(0, 0);
 331         for (i = 0; i < 8; i++) {
 332             SetColor(COLOR_WHITE-i);
 333             glVertex2iv(vx[i]);
 334         }
 335     glEnd();
 336
 337     glBegin(GL_TRIANGLE_FAN);
 338         glVertex2i(0, 0);
 339         glVertex2i(-100, 100);
 340     glEnd();
 341 }
 342
 343 static void Rect(void)
 344 {
 345
 346     SetColor(COLOR_GREEN);
 347     glRecti(-boxW/4, -boxH/4, boxW/4, boxH/4);
 348 }
 349
 350 static void PolygonFunc(void)
 351 {
 352     GLint vx[8][2];
 353     GLint x0, y0, x1, y1, x2, y2, x3, y3;
 354     GLint i;
 355
 356     y0 = -boxH/4;
 357     y1 = y0 + boxH/2/3;
 358     y2 = y1 + boxH/2/3;
 359     y3 = boxH/4;
 360     x0 = -boxW/4;
 361     x1 = x0 + boxW/2/3;
 362     x2 = x1 + boxW/2/3;
 363     x3 = boxW/4;
 364
 365     vx[0][0] = x0; vx[0][1] = y1;
 366     vx[1][0] = x0; vx[1][1] = y2;
 367     vx[2][0] = x1; vx[2][1] = y3;
 368     vx[3][0] = x2; vx[3][1] = y3;
 369     vx[4][0] = x3; vx[4][1] = y2;
 370     vx[5][0] = x3; vx[5][1] = y1;
 371     vx[6][0] = x2; vx[6][1] = y0;
 372     vx[7][0] = x1; vx[7][1] = y0;
 373
 374     glBegin(GL_POLYGON);
 375         for (i = 0; i < 8; i++) {
 376             SetColor(COLOR_WHITE-i);
 377             glVertex2iv(vx[i]);
 378         }
 379     glEnd();
 380
 381     glBegin(GL_POLYGON);
 382         glVertex2i(0, 0);
 383         glVertex2i(100, 100);
 384     glEnd();
 385 }
 386
 387 static void Quads(void)
 388 {
 389
 390     glBegin(GL_QUADS);
 391         SetColor(COLOR_GREEN);
 392         glVertex2i(-boxW/4, -boxH/4);
 393         SetColor(COLOR_RED);
 394         glVertex2i(-boxW/8, -boxH/16);
 395         SetColor(COLOR_BLUE);
 396         glVertex2i(boxW/8, -boxH/16);
 397         SetColor(COLOR_WHITE);
 398         glVertex2i(boxW/4, -boxH/4);
 399
 400         SetColor(COLOR_GREEN);
 401         glVertex2i(-boxW/4, boxH/4);
 402         SetColor(COLOR_RED);
 403         glVertex2i(-boxW/8, boxH/16);
 404         SetColor(COLOR_BLUE);
 405         glVertex2i(boxW/8, boxH/16);
 406         SetColor(COLOR_WHITE);
 407         glVertex2i(boxW/4, boxH/4);
 408     glEnd();
 409
 410     glBegin(GL_QUADS);
 411         glVertex2i(0, 0);
 412         glVertex2i(100, 100);
 413         glVertex2i(-100, 100);
 414     glEnd();
 415 }
 416
 417 static void QuadStrip(void)
 418 {
 419
 420     glBegin(GL_QUAD_STRIP);
 421         SetColor(COLOR_GREEN);
 422         glVertex2i(-boxW/4, -boxH/4);
 423         SetColor(COLOR_RED);
 424         glVertex2i(-boxW/4, boxH/4);
 425         SetColor(COLOR_BLUE);
 426         glVertex2i(0, -boxH/4);
 427         SetColor(COLOR_WHITE);
 428         glVertex2i(0, boxH/4);
 429         SetColor(COLOR_CYAN);
 430         glVertex2i(boxW/4, -boxH/4);
 431         SetColor(COLOR_YELLOW);
 432         glVertex2i(boxW/4, boxH/4);
 433     glEnd();
 434
 435     glBegin(GL_QUAD_STRIP);
 436         glVertex2i(0, 0);
 437         glVertex2i(100, 100);
 438         glVertex2i(-100, 100);
 439     glEnd();
 440 }
 441
 442 static void Draw(void)
 443 {
 444
 445     glViewport(0, 0, windW, windH);
 446     glDisable(GL_SCISSOR_TEST);
 447
 448     glPushAttrib(GL_COLOR_BUFFER_BIT);
 449
 450     glColorMask(1, 1, 1, 1);
 451     glIndexMask(~0);
 452
 453     glClearColor(0.0, 0.0, 0.0, 0.0);
 454     glClear(GL_COLOR_BUFFER_BIT);
 455
 456     glPopAttrib();
 457
 458     if (mode1) {
 459         glShadeModel(GL_SMOOTH);
 460     } else {
 461         glShadeModel(GL_FLAT);
 462     }
 463
 464     if (mode2) {
 465         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 466     } else {
 467         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 468     }
 469
 470     Viewport(0, 0); Point();
 471     Viewport(0, 1); Lines();
 472     Viewport(0, 2); LineStrip();
 473     Viewport(0, 3); LineLoop();
 474
 475     Viewport(1, 0); Bitmap();
 476     Viewport(1, 1); TriangleFan();
 477     Viewport(1, 2); Triangles();
 478     Viewport(1, 3); TriangleStrip();
 479
 480     Viewport(2, 0); Rect();
 481     Viewport(2, 1); PolygonFunc();
 482     Viewport(2, 2); Quads();
 483     Viewport(2, 3); QuadStrip();
 484
 485     glFlush();
 486
 487     if (doubleBuffer) {
 488         glutSwapBuffers();
 489     }
 490 }
 491
 492 static GLenum Args(int argc, char **argv)
 493 {
 494     GLint i;
 495
 496     rgb = GL_TRUE;
 497     doubleBuffer = GL_FALSE;
 498
 499     for (i = 1; i < argc; i++) {
 500         if (strcmp(argv[i], "-ci") == 0) {
 501             rgb = GL_FALSE;
 502         } else if (strcmp(argv[i], "-rgb") == 0) {
 503             rgb = GL_TRUE;
 504         } else if (strcmp(argv[i], "-sb") == 0) {
 505             doubleBuffer = GL_FALSE;
 506         } else if (strcmp(argv[i], "-db") == 0) {
 507             doubleBuffer = GL_TRUE;
 508         } else {
 509             printf("%s (Bad option).\n", argv[i]);
 510             return GL_FALSE;
 511         }
 512     }
 513     return GL_TRUE;
 514 }
 515
 516 int main(int argc, char **argv)
 517 {
 518     glutInit(&argc, argv);
 519
 520     if (Args(argc, argv) == GL_FALSE) {
 521         exit(1);
 522     }
 523
 524     windW = 600;
 525     windH = 300;
 526     glutInitWindowPosition(0, 0); glutInitWindowSize( windW, windH);
 527
 528     windType = (rgb) ? GLUT_RGB : GLUT_INDEX;
 529     windType |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 530     glutInitDisplayMode(windType);
 531
 532     if (glutCreateWindow("Primitive Test") == GL_FALSE) {
 533         exit(1);
 534     }
 535
 536     InitMap();
 537
 538     Init();
 539
 540     glutReshapeFunc(Reshape);
 541     glutKeyboardFunc(Key);
 542     glutDisplayFunc(Draw);
 543     glutMainLoop();
 544         return 0;
 545 }