Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Use glCopyTexSubImage2D to draw animated gears on the sides of a box. |
| 3 | * |
| 4 | * Brian Paul |
| 5 | * 27 January 2006 |
| 6 | */ |
| 7 | |
| 8 | #include <math.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <stdio.h> |
| 11 | #include <string.h> |
| 12 | #include <GL/glut.h> |
| 13 | |
| 14 | #ifndef M_PI |
| 15 | #define M_PI 3.14159265 |
| 16 | #endif |
| 17 | |
| 18 | static GLint WinWidth = 800, WinHeight = 500; |
| 19 | static GLint TexWidth, TexHeight; |
| 20 | static GLuint TexObj = 1; |
| 21 | static GLenum IntFormat = GL_RGB; |
| 22 | |
| 23 | static GLboolean WireFrame = GL_FALSE; |
| 24 | |
| 25 | static GLint T0 = 0; |
| 26 | static GLint Frames = 0; |
| 27 | static GLint Win = 0; |
| 28 | |
| 29 | static GLfloat ViewRotX = 20.0, ViewRotY = 30.0, ViewRotZ = 0.0; |
| 30 | static GLint Gear1, Gear2, Gear3; |
| 31 | static GLfloat GearRot = 0.0; |
| 32 | static GLfloat CubeRot = 0.0; |
| 33 | |
| 34 | |
| 35 | /** |
| 36 | Draw a gear wheel. You'll probably want to call this function when |
| 37 | building a display list since we do a lot of trig here. |
| 38 | |
| 39 | Input: inner_radius - radius of hole at center |
| 40 | outer_radius - radius at center of teeth |
| 41 | width - width of gear |
| 42 | teeth - number of teeth |
| 43 | tooth_depth - depth of tooth |
| 44 | **/ |
| 45 | static void |
| 46 | gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width, |
| 47 | GLint teeth, GLfloat tooth_depth) |
| 48 | { |
| 49 | GLint i; |
| 50 | GLfloat r0, r1, r2; |
| 51 | GLfloat angle, da; |
| 52 | GLfloat u, v, len; |
| 53 | |
| 54 | r0 = inner_radius; |
| 55 | r1 = outer_radius - tooth_depth / 2.0; |
| 56 | r2 = outer_radius + tooth_depth / 2.0; |
| 57 | |
| 58 | da = 2.0 * M_PI / teeth / 4.0; |
| 59 | |
| 60 | glShadeModel(GL_FLAT); |
| 61 | |
| 62 | glNormal3f(0.0, 0.0, 1.0); |
| 63 | |
| 64 | /* draw front face */ |
| 65 | glBegin(GL_QUAD_STRIP); |
| 66 | for (i = 0; i <= teeth; i++) { |
| 67 | angle = i * 2.0 * M_PI / teeth; |
| 68 | glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); |
| 69 | glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); |
| 70 | if (i < teeth) { |
| 71 | glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); |
| 72 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); |
| 73 | } |
| 74 | } |
| 75 | glEnd(); |
| 76 | |
| 77 | /* draw front sides of teeth */ |
| 78 | glBegin(GL_QUADS); |
| 79 | da = 2.0 * M_PI / teeth / 4.0; |
| 80 | for (i = 0; i < teeth; i++) { |
| 81 | angle = i * 2.0 * M_PI / teeth; |
| 82 | |
| 83 | glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); |
| 84 | glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5); |
| 85 | glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5); |
| 86 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); |
| 87 | } |
| 88 | glEnd(); |
| 89 | |
| 90 | glNormal3f(0.0, 0.0, -1.0); |
| 91 | |
| 92 | /* draw back face */ |
| 93 | glBegin(GL_QUAD_STRIP); |
| 94 | for (i = 0; i <= teeth; i++) { |
| 95 | angle = i * 2.0 * M_PI / teeth; |
| 96 | glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); |
| 97 | glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); |
| 98 | if (i < teeth) { |
| 99 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); |
| 100 | glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); |
| 101 | } |
| 102 | } |
| 103 | glEnd(); |
| 104 | |
| 105 | /* draw back sides of teeth */ |
| 106 | glBegin(GL_QUADS); |
| 107 | da = 2.0 * M_PI / teeth / 4.0; |
| 108 | for (i = 0; i < teeth; i++) { |
| 109 | angle = i * 2.0 * M_PI / teeth; |
| 110 | |
| 111 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); |
| 112 | glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5); |
| 113 | glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5); |
| 114 | glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); |
| 115 | } |
| 116 | glEnd(); |
| 117 | |
| 118 | /* draw outward faces of teeth */ |
| 119 | glBegin(GL_QUAD_STRIP); |
| 120 | for (i = 0; i < teeth; i++) { |
| 121 | angle = i * 2.0 * M_PI / teeth; |
| 122 | |
| 123 | glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); |
| 124 | glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); |
| 125 | u = r2 * cos(angle + da) - r1 * cos(angle); |
| 126 | v = r2 * sin(angle + da) - r1 * sin(angle); |
| 127 | len = sqrt(u * u + v * v); |
| 128 | u /= len; |
| 129 | v /= len; |
| 130 | glNormal3f(v, -u, 0.0); |
| 131 | glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5); |
| 132 | glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5); |
| 133 | glNormal3f(cos(angle), sin(angle), 0.0); |
| 134 | glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5); |
| 135 | glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5); |
| 136 | u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da); |
| 137 | v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da); |
| 138 | glNormal3f(v, -u, 0.0); |
| 139 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); |
| 140 | glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); |
| 141 | glNormal3f(cos(angle), sin(angle), 0.0); |
| 142 | } |
| 143 | |
| 144 | glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5); |
| 145 | glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5); |
| 146 | |
| 147 | glEnd(); |
| 148 | |
| 149 | glShadeModel(GL_SMOOTH); |
| 150 | |
| 151 | /* draw inside radius cylinder */ |
| 152 | glBegin(GL_QUAD_STRIP); |
| 153 | for (i = 0; i <= teeth; i++) { |
| 154 | angle = i * 2.0 * M_PI / teeth; |
| 155 | glNormal3f(-cos(angle), -sin(angle), 0.0); |
| 156 | glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); |
| 157 | glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); |
| 158 | } |
| 159 | glEnd(); |
| 160 | |
| 161 | } |
| 162 | |
| 163 | static void |
| 164 | cleanup(void) |
| 165 | { |
| 166 | glDeleteTextures(1, &TexObj); |
| 167 | glDeleteLists(Gear1, 1); |
| 168 | glDeleteLists(Gear2, 1); |
| 169 | glDeleteLists(Gear3, 1); |
| 170 | glutDestroyWindow(Win); |
| 171 | } |
| 172 | |
| 173 | |
| 174 | static void |
| 175 | DrawGears(void) |
| 176 | { |
| 177 | if (WireFrame) { |
| 178 | glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); |
| 179 | } |
| 180 | |
| 181 | glPushMatrix(); |
| 182 | glRotatef(20/*ViewRotX*/, 1.0, 0.0, 0.0); |
| 183 | glRotatef(ViewRotY, 0.0, 1.0, 0.0); |
| 184 | glRotatef(ViewRotZ, 0.0, 0.0, 1.0); |
| 185 | |
| 186 | glPushMatrix(); |
| 187 | glTranslatef(-3.0, -2.0, 0.0); |
| 188 | glRotatef(GearRot, 0.0, 0.0, 1.0); |
| 189 | glCallList(Gear1); |
| 190 | glPopMatrix(); |
| 191 | |
| 192 | glPushMatrix(); |
| 193 | glTranslatef(3.1, -2.0, 0.0); |
| 194 | glRotatef(-2.0 * GearRot - 9.0, 0.0, 0.0, 1.0); |
| 195 | glCallList(Gear2); |
| 196 | glPopMatrix(); |
| 197 | |
| 198 | glPushMatrix(); |
| 199 | glTranslatef(-3.1, 4.2, 0.0); |
| 200 | glRotatef(-2.0 * GearRot - 25.0, 0.0, 0.0, 1.0); |
| 201 | glCallList(Gear3); |
| 202 | glPopMatrix(); |
| 203 | |
| 204 | glPopMatrix(); |
| 205 | |
| 206 | glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); |
| 207 | } |
| 208 | |
| 209 | |
| 210 | static void |
| 211 | DrawCube(void) |
| 212 | { |
| 213 | static const GLfloat texcoords[4][2] = { |
| 214 | { 0, 0 }, { 1, 0 }, { 1, 1 }, { 0, 1 } |
| 215 | }; |
| 216 | static const GLfloat vertices[4][2] = { |
| 217 | { -1, -1 }, { 1, -1 }, { 1, 1 }, { -1, 1 } |
| 218 | }; |
| 219 | static const GLfloat xforms[6][4] = { |
| 220 | { 0, 0, 1, 0 }, |
| 221 | { 90, 0, 1, 0 }, |
| 222 | { 180, 0, 1, 0 }, |
| 223 | { 270, 0, 1, 0 }, |
| 224 | { 90, 1, 0, 0 }, |
| 225 | { -90, 1, 0, 0 } |
| 226 | }; |
| 227 | static const GLfloat mat[4] = { 1.0, 1.0, 0.5, 1.0 }; |
| 228 | GLint i, j; |
| 229 | |
| 230 | glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat); |
| 231 | glEnable(GL_TEXTURE_2D); |
| 232 | |
| 233 | glPushMatrix(); |
| 234 | glRotatef(ViewRotX, 1.0, 0.0, 0.0); |
| 235 | glRotatef(15, 1, 0, 0); |
| 236 | glRotatef(CubeRot, 0, 1, 0); |
| 237 | glScalef(4, 4, 4); |
| 238 | |
| 239 | for (i = 0; i < 6; i++) { |
| 240 | glPushMatrix(); |
| 241 | glRotatef(xforms[i][0], xforms[i][1], xforms[i][2], xforms[i][3]); |
| 242 | glTranslatef(0, 0, 1.1); |
| 243 | glBegin(GL_POLYGON); |
| 244 | glNormal3f(0, 0, 1); |
| 245 | for (j = 0; j < 4; j++) { |
| 246 | glTexCoord2fv(texcoords[j]); |
| 247 | glVertex2fv(vertices[j]); |
| 248 | } |
| 249 | glEnd(); |
| 250 | glPopMatrix(); |
| 251 | } |
| 252 | glPopMatrix(); |
| 253 | |
| 254 | glDisable(GL_TEXTURE_2D); |
| 255 | } |
| 256 | |
| 257 | |
| 258 | static void |
| 259 | draw(void) |
| 260 | { |
| 261 | float ar; |
| 262 | |
| 263 | glMatrixMode(GL_MODELVIEW); |
| 264 | glLoadIdentity(); |
| 265 | glTranslatef(0.0, 0.0, -40.0); |
| 266 | |
Brian Paul | 60b9212 | 2008-08-13 08:46:35 -0600 | [diff] [blame] | 267 | /* clear whole depth buffer */ |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 268 | glDisable(GL_SCISSOR_TEST); |
| 269 | glClear(GL_DEPTH_BUFFER_BIT); |
| 270 | glEnable(GL_SCISSOR_TEST); |
| 271 | |
Brian Paul | 60b9212 | 2008-08-13 08:46:35 -0600 | [diff] [blame] | 272 | /* clear upper-left corner of color buffer (unused space) */ |
| 273 | glScissor(0, TexHeight, TexWidth, WinHeight - TexHeight); |
| 274 | glClearColor(0.0, 0.0, 0.0, 0.0); |
| 275 | glClear(GL_COLOR_BUFFER_BIT); |
| 276 | |
| 277 | /* clear lower-left corner of color buffer */ |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 278 | glViewport(0, 0, TexWidth, TexHeight); |
| 279 | glScissor(0, 0, TexWidth, TexHeight); |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 280 | glClearColor(1, 1, 1, 0); |
| 281 | glClear(GL_COLOR_BUFFER_BIT); |
| 282 | |
Brian Paul | 60b9212 | 2008-08-13 08:46:35 -0600 | [diff] [blame] | 283 | /* draw gears in lower-left corner */ |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 284 | glMatrixMode(GL_PROJECTION); |
| 285 | glLoadIdentity(); |
| 286 | glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 60.0); |
| 287 | glMatrixMode(GL_MODELVIEW); |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 288 | DrawGears(); |
| 289 | |
Brian Paul | 60b9212 | 2008-08-13 08:46:35 -0600 | [diff] [blame] | 290 | /* copy color buffer to texture */ |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 291 | glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, TexWidth, TexHeight); |
| 292 | |
Brian Paul | 60b9212 | 2008-08-13 08:46:35 -0600 | [diff] [blame] | 293 | /* clear right half of color buffer */ |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 294 | glViewport(TexWidth, 0, WinWidth - TexWidth, WinHeight); |
| 295 | glScissor(TexWidth, 0, WinWidth - TexWidth, WinHeight); |
| 296 | glClearColor(0.5, 0.5, 0.8, 0.0); |
| 297 | glClear(GL_COLOR_BUFFER_BIT); |
| 298 | |
Brian Paul | 60b9212 | 2008-08-13 08:46:35 -0600 | [diff] [blame] | 299 | /* draw textured cube in right half of window */ |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 300 | ar = (float) (WinWidth - TexWidth) / WinHeight; |
| 301 | glMatrixMode(GL_PROJECTION); |
| 302 | glLoadIdentity(); |
| 303 | glFrustum(-ar, ar, -1.0, 1.0, 5.0, 60.0); |
| 304 | glMatrixMode(GL_MODELVIEW); |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 305 | DrawCube(); |
| 306 | |
| 307 | /* finish up */ |
| 308 | glutSwapBuffers(); |
| 309 | |
| 310 | Frames++; |
| 311 | { |
| 312 | GLint t = glutGet(GLUT_ELAPSED_TIME); |
| 313 | if (t - T0 >= 5000) { |
| 314 | GLfloat seconds = (t - T0) / 1000.0; |
| 315 | GLfloat fps = Frames / seconds; |
| 316 | printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps); |
Keith Whitwell | e6479c6 | 2009-02-24 12:02:24 +0000 | [diff] [blame] | 317 | fflush(stdout); |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 318 | T0 = t; |
| 319 | Frames = 0; |
| 320 | } |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | |
| 325 | static void |
| 326 | idle(void) |
| 327 | { |
| 328 | static double t0 = -1.; |
| 329 | double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0; |
| 330 | if (t0 < 0.0) |
| 331 | t0 = t; |
| 332 | dt = t - t0; |
| 333 | t0 = t; |
| 334 | |
Brian Paul | 7905b19 | 2006-01-30 15:35:35 +0000 | [diff] [blame] | 335 | /* fmod to prevent overflow */ |
| 336 | GearRot = fmod(GearRot + 70.0 * dt, 360.0); /* 70 deg/sec */ |
| 337 | CubeRot = fmod(CubeRot + 15.0 * dt, 360.0); /* 15 deg/sec */ |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 338 | |
| 339 | glutPostRedisplay(); |
| 340 | } |
| 341 | |
| 342 | |
| 343 | /* change view angle, exit upon ESC */ |
| 344 | static void |
| 345 | key(unsigned char k, int x, int y) |
| 346 | { |
| 347 | (void) x; |
| 348 | (void) y; |
| 349 | switch (k) { |
| 350 | case 'w': |
| 351 | WireFrame = !WireFrame; |
| 352 | break; |
| 353 | case 'z': |
| 354 | ViewRotZ += 5.0; |
| 355 | break; |
| 356 | case 'Z': |
| 357 | ViewRotZ -= 5.0; |
| 358 | break; |
| 359 | case 27: /* Escape */ |
| 360 | cleanup(); |
| 361 | exit(0); |
| 362 | break; |
| 363 | default: |
| 364 | return; |
| 365 | } |
| 366 | glutPostRedisplay(); |
| 367 | } |
| 368 | |
| 369 | /* change view angle */ |
| 370 | static void |
| 371 | special(int k, int x, int y) |
| 372 | { |
| 373 | (void) x; |
| 374 | (void) y; |
| 375 | switch (k) { |
| 376 | case GLUT_KEY_UP: |
| 377 | ViewRotX += 5.0; |
| 378 | break; |
| 379 | case GLUT_KEY_DOWN: |
| 380 | ViewRotX -= 5.0; |
| 381 | break; |
| 382 | case GLUT_KEY_LEFT: |
| 383 | ViewRotY += 5.0; |
| 384 | break; |
| 385 | case GLUT_KEY_RIGHT: |
| 386 | ViewRotY -= 5.0; |
| 387 | break; |
| 388 | default: |
| 389 | return; |
| 390 | } |
| 391 | glutPostRedisplay(); |
| 392 | } |
| 393 | |
| 394 | |
| 395 | /* new window size or exposure */ |
| 396 | static void |
| 397 | reshape(int width, int height) |
| 398 | { |
| 399 | WinWidth = width; |
| 400 | WinHeight = height; |
| 401 | } |
| 402 | |
| 403 | |
| 404 | static void |
| 405 | init(int argc, char *argv[]) |
| 406 | { |
| 407 | static GLfloat pos[4] = {5.0, 5.0, 10.0, 0.0}; |
| 408 | static GLfloat red[4] = {0.8, 0.1, 0.0, 1.0}; |
| 409 | static GLfloat green[4] = {0.0, 0.8, 0.2, 1.0}; |
| 410 | static GLfloat blue[4] = {0.2, 0.2, 1.0, 1.0}; |
| 411 | GLint i; |
| 412 | |
| 413 | glLightfv(GL_LIGHT0, GL_POSITION, pos); |
| 414 | #if 0 |
| 415 | glEnable(GL_CULL_FACE); |
| 416 | #endif |
| 417 | glEnable(GL_LIGHTING); |
| 418 | glEnable(GL_LIGHT0); |
| 419 | glEnable(GL_DEPTH_TEST); |
| 420 | |
| 421 | /* make the gears */ |
| 422 | Gear1 = glGenLists(1); |
| 423 | glNewList(Gear1, GL_COMPILE); |
| 424 | glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red); |
| 425 | gear(1.0, 4.0, 1.0, 20, 0.7); |
| 426 | glEndList(); |
| 427 | |
| 428 | Gear2 = glGenLists(1); |
| 429 | glNewList(Gear2, GL_COMPILE); |
| 430 | glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green); |
| 431 | gear(0.5, 2.0, 2.0, 10, 0.7); |
| 432 | glEndList(); |
| 433 | |
| 434 | Gear3 = glGenLists(1); |
| 435 | glNewList(Gear3, GL_COMPILE); |
| 436 | glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue); |
| 437 | gear(1.3, 2.0, 0.5, 10, 0.7); |
| 438 | glEndList(); |
| 439 | |
| 440 | glEnable(GL_NORMALIZE); |
| 441 | |
| 442 | /* xxx make size dynamic */ |
| 443 | TexWidth = 256; |
| 444 | TexHeight = 256; |
| 445 | |
| 446 | glBindTexture(GL_TEXTURE_2D, TexObj); |
| 447 | glTexImage2D(GL_TEXTURE_2D, 0, IntFormat, TexWidth, TexHeight, 0, |
| 448 | GL_RGBA, GL_UNSIGNED_BYTE, NULL); |
| 449 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| 450 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| 451 | glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); |
| 452 | |
| 453 | for ( i=1; i<argc; i++ ) { |
| 454 | if (strcmp(argv[i], "-info")==0) { |
| 455 | printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); |
| 456 | printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION)); |
| 457 | printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR)); |
| 458 | printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS)); |
| 459 | } |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | |
| 464 | static void |
| 465 | visible(int vis) |
| 466 | { |
| 467 | if (vis == GLUT_VISIBLE) |
| 468 | glutIdleFunc(idle); |
| 469 | else |
| 470 | glutIdleFunc(NULL); |
| 471 | } |
| 472 | |
| 473 | |
| 474 | int |
| 475 | main(int argc, char *argv[]) |
| 476 | { |
Brian Paul | 263f432 | 2009-12-18 08:12:55 -0700 | [diff] [blame] | 477 | glutInitWindowSize(WinWidth, WinHeight); |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 478 | glutInit(&argc, argv); |
| 479 | glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE); |
| 480 | |
Brian Paul | daf3093 | 2006-01-28 00:30:07 +0000 | [diff] [blame] | 481 | Win = glutCreateWindow("gearbox"); |
| 482 | init(argc, argv); |
| 483 | |
| 484 | glutDisplayFunc(draw); |
| 485 | glutReshapeFunc(reshape); |
| 486 | glutKeyboardFunc(key); |
| 487 | glutSpecialFunc(special); |
| 488 | glutVisibilityFunc(visible); |
| 489 | |
| 490 | glutMainLoop(); |
| 491 | return 0; /* ANSI C requires main to return int. */ |
| 492 | } |