git.mutantstargoat.com Git - antikythera/blob - src/main.cc

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <assert.h>
   4 #include <GL/glew.h>
   5 #ifdef __APPLE__
   6 #include <GLUT/glut.h>
   7 #else
   8 #include <GL/glut.h>
   9 #endif
  10 #include "app.h"
  11 #include "sdr.h"
  12 #include "shadow.h"
  13 #include "texture.h"
  14 #include "machine.h"
  15 #include "meshgen.h"
  16
  17 static bool init();
  18 static void cleanup();
  19 static void display();
  20 static void idle();
  21 static void draw_scene();
  22 static void draw_gears();
  23 static void reshape(int x, int y);
  24 static void keyb(unsigned char key, int x, int y);
  25 static void mouse(int bn, int st, int x, int y);
  26 static void motion(int x, int y);
  27 static void passive_motion(int x, int y);
  28 static Gear *pick_gear(int x, int y);
  29
  30 static int win_width, win_height;
  31
  32 static float cam_dist = 0.25;
  33 static float cam_theta, cam_phi = 20;
  34 static int prev_mx, prev_my;
  35 static bool bnstate[8];
  36
  37 static Mat4 view_matrix;
  38
  39 static unsigned int start_time, prev_msec;
  40 static Machine *machine;
  41 static Gear *hover_gear, *sel_gear;
  42 static HitPoint pick_hit;
  43 static Vec3 sel_hit_pos;
  44
  45 static unsigned int sdr_shadow_notex;
  46 static int dbg_show_shadowmap;
  47
  48 static TextureSet texman;
  49 static Texture *envmap;
  50 static Mesh *skydome;
  51 static unsigned int sdr_skydome;
  52
  53
  54 int main(int argc, char **argv)
  55 {
  56         glutInitWindowSize(1024, 768);
  57         glutInit(&argc, argv);
  58         glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | GLUT_MULTISAMPLE);
  59         glutCreateWindow("Antikythera");
  60
  61         glutDisplayFunc(display);
  62         glutIdleFunc(idle);
  63         glutReshapeFunc(reshape);
  64         glutKeyboardFunc(keyb);
  65         glutMouseFunc(mouse);
  66         glutMotionFunc(motion);
  67         glutPassiveMotionFunc(passive_motion);
  68
  69         if(!init()) {
  70                 return 1;
  71         }
  72         atexit(cleanup);
  73
  74         glutMainLoop();
  75         return 0;
  76 }
  77
  78 static bool init()
  79 {
  80         glewInit();
  81
  82         glEnable(GL_MULTISAMPLE);
  83         glEnable(GL_DEPTH_TEST);
  84         glEnable(GL_CULL_FACE);
  85         glEnable(GL_LIGHTING);
  86         glEnable(GL_NORMALIZE);
  87
  88         Mesh::use_custom_sdr_attr = false;
  89
  90         machine = new Machine;
  91
  92         const float pitch = 10.0f;
  93
  94         Gear *gear1 = new Gear;
  95         gear1->pos = Vec3(-50, 0, 0);
  96         gear1->set_teeth(16, pitch);
  97         gear1->gen_mesh();
  98         gear1->color = Vec3(0.35, 0.6, 0.8);
  99         machine->add_gear(gear1);
 100
 101         Gear *gear2 = new Gear;
 102         gear2->set_teeth(32, pitch);
 103         gear2->pos = gear1->pos + Vec3(gear1->radius + gear2->radius - gear1->teeth_length * 0.75, 0, 0);
 104         gear2->thickness = 5;
 105         gear2->gen_mesh();
 106         machine->add_gear(gear2);
 107
 108         Gear *gear3 = new Gear;
 109         gear3->set_teeth(8, pitch);
 110         gear3->pos = gear2->pos + Vec3(0, gear2->radius + gear3->radius - gear2->teeth_length * 0.75, 0);
 111         gear3->gen_mesh();
 112         machine->add_gear(gear3);
 113         gear3->color = Vec3(0.5, 0.8, 0.6);
 114
 115         Gear *subgear = new Gear;
 116         subgear->set_teeth(10, pitch);
 117         subgear->pos = Vec3(0, 0, (gear2->thickness + subgear->thickness) / 2 + 1);
 118         subgear->gen_mesh();
 119         gear2->attach(subgear);
 120         machine->add_gear(subgear);
 121         subgear->color = Vec3(0.8, 0.7, 0.5);
 122
 123         machine->add_motor(0, 1.0);
 124
 125         // shadows
 126         init_shadow(2048);
 127
 128         if(!(sdr_shadow_notex = create_program_load("sdr/shadow.v.glsl", "sdr/shadow-notex.p.glsl"))) {
 129                 return false;
 130         }
 131         set_uniform_int(sdr_shadow_notex, "shadowmap", 1);
 132         set_uniform_int(sdr_shadow_notex, "envmap", 2);
 133
 134         float ambient[] = {0.1, 0.1, 0.1, 0.0};
 135         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
 136
 137         // env
 138         envmap = texman.get_texture("data/stpeters_cross.jpg", TEX_CUBE);
 139
 140         skydome = new Mesh;
 141         gen_sphere(skydome, 1.0, 16, 8);
 142         skydome->flip_faces();
 143
 144         if(!(sdr_skydome = create_program_load("sdr/skydome.v.glsl", "sdr/skydome.p.glsl"))) {
 145                 return false;
 146         }
 147         glUseProgram(0);
 148
 149         start_time = glutGet(GLUT_ELAPSED_TIME);
 150         return true;
 151 }
 152
 153 static void cleanup()
 154 {
 155         texman.clear();
 156         delete machine;
 157 }
 158
 159 static void update(float dt)
 160 {
 161         texman.update();
 162
 163         machine->update(dt);
 164
 165         if(sel_gear) {
 166         }
 167
 168         hover_gear = pick_gear(prev_mx, prev_my);
 169 }
 170
 171 static void set_light(int idx, const Vec3 &pos, const Vec3 &color)
 172 {
 173         unsigned int lt = GL_LIGHT0 + idx;
 174         float posv[] = { pos.x, pos.y, pos.z, 1 };
 175         float colv[] = { color.x, color.y, color.z, 1 };
 176
 177         glEnable(lt);
 178         glLightfv(lt, GL_POSITION, posv);
 179         glLightfv(lt, GL_DIFFUSE, colv);
 180         glLightfv(lt, GL_SPECULAR, colv);
 181 }
 182
 183 static void display()
 184 {
 185         unsigned int msec = glutGet(GLUT_ELAPSED_TIME) - start_time;
 186         float dt = (float)(msec - prev_msec) / 1000.0f;
 187         prev_msec = msec;
 188
 189         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 190
 191         view_matrix = Mat4::identity;
 192         view_matrix.pre_translate(0, 0, -cam_dist);
 193         view_matrix.pre_rotate(deg_to_rad(cam_phi), 1, 0, 0);
 194         view_matrix.pre_rotate(deg_to_rad(cam_theta), 0, 1, 0);
 195
 196         glMatrixMode(GL_MODELVIEW);
 197         glLoadMatrixf(view_matrix[0]);
 198
 199         static const Vec3 lpos[] = { Vec3(-50, 75, 100), Vec3(100, 0, 30), Vec3(-10, -10, 60) };
 200         set_light(0, lpos[0], Vec3(1.0, 0.8, 0.7) * 0.8);
 201         set_light(1, lpos[1], Vec3(0.6, 0.7, 1.0) * 0.6);
 202         set_light(2, lpos[2], Vec3(0.8, 1.0, 0.8) * 0.3);
 203
 204         update(dt);
 205
 206         // shadowmap pass
 207         begin_shadow_pass(lpos[0], Vec3(0, 0, 0), 0.2, 100, 150);
 208         draw_scene();
 209         end_shadow_pass();
 210
 211         // regular pass
 212         const Mat4 &shadow_matrix = get_shadow_matrix();
 213         Mat4 env_matrix = transpose(view_matrix.upper3x3());
 214         set_uniform_matrix4(sdr_shadow_notex, "envmap_matrix", env_matrix[0]);
 215
 216         glActiveTexture(GL_TEXTURE1);
 217         glBindTexture(GL_TEXTURE_2D, get_shadow_tex());
 218         glMatrixMode(GL_TEXTURE);
 219         glLoadMatrixf(shadow_matrix[0]);
 220
 221         glActiveTexture(GL_TEXTURE2);
 222         glBindTexture(GL_TEXTURE_CUBE_MAP, envmap->get_id());
 223
 224         glActiveTexture(GL_TEXTURE0);
 225         glMatrixMode(GL_MODELVIEW);
 226
 227         draw_scene();
 228
 229         glMatrixMode(GL_TEXTURE);
 230         glLoadIdentity();
 231         glMatrixMode(GL_MODELVIEW);
 232
 233
 234         if(dbg_show_shadowmap) {
 235                 glMatrixMode(GL_PROJECTION);
 236                 glPushMatrix();
 237                 glLoadIdentity();
 238                 glMatrixMode(GL_MODELVIEW);
 239                 glPushMatrix();
 240                 glLoadIdentity();
 241                 glMatrixMode(GL_TEXTURE);
 242                 glLoadIdentity();
 243
 244                 glPushAttrib(GL_ENABLE_BIT);
 245                 glUseProgram(0);
 246                 glBindTexture(GL_TEXTURE_2D, get_shadow_tex());
 247                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_NONE);
 248                 glEnable(GL_TEXTURE_2D);
 249                 glDisable(GL_DEPTH_TEST);
 250                 glDisable(GL_LIGHTING);
 251                 glDisable(GL_BLEND);
 252
 253                 glBegin(GL_QUADS);
 254                 glColor4f(1, 1, 1, 1);
 255                 glTexCoord2f(0, 0); glVertex2f(-0.95, -0.95);
 256                 glTexCoord2f(1, 0); glVertex2f(-0.5, -0.95);
 257                 glTexCoord2f(1, 1); glVertex2f(-0.5, -0.5);
 258                 glTexCoord2f(0, 1); glVertex2f(-0.95, -0.5);
 259                 glEnd();
 260
 261                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_R_TO_TEXTURE);
 262                 glBindTexture(GL_TEXTURE_2D, 0);
 263
 264                 glPopAttrib();
 265
 266                 glMatrixMode(GL_PROJECTION);
 267                 glPopMatrix();
 268                 glMatrixMode(GL_MODELVIEW);
 269                 glPopMatrix();
 270         }
 271
 272
 273         glutSwapBuffers();
 274         assert(glGetError() == GL_NO_ERROR);
 275 }
 276
 277 static void idle()
 278 {
 279         glutPostRedisplay();
 280 }
 281
 282 static void draw_scene()
 283 {
 284         // draw skydome
 285         glDepthMask(0);
 286
 287         Mat4 rot_view = view_matrix.upper3x3();
 288         glMatrixMode(GL_MODELVIEW);
 289         glPushMatrix();
 290         glLoadMatrixf(rot_view[0]);
 291
 292         bind_texture(envmap, 0);
 293
 294         glUseProgram(sdr_skydome);
 295         skydome->draw();
 296         glUseProgram(0);
 297
 298         bind_texture(0, 0);
 299
 300         glPopMatrix();
 301         glDepthMask(1);
 302
 303         // draw mechanism
 304         draw_gears();
 305 }
 306
 307 static void draw_gears()
 308 {
 309         /* world scale is in meters, gears are in millimeters, scale by 1/1000 */
 310         glPushMatrix();
 311         glScalef(0.001, 0.001, 0.001);
 312
 313         if(!shadow_pass && (sel_gear || hover_gear)) {
 314                 glPushAttrib(GL_ENABLE_BIT | GL_LINE_BIT | GL_POLYGON_BIT);
 315
 316                 glDisable(GL_LIGHTING);
 317                 glFrontFace(GL_CW);
 318                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 319                 glLineWidth(3.0);
 320
 321                 if(sel_gear) {
 322                         glColor3f(0.2, 1.0, 0.3);
 323                         sel_gear->draw();
 324                 } else {
 325                         glColor3f(1.0, 0.75, 0.2);
 326                         hover_gear->draw();
 327                 }
 328
 329                 glPopAttrib();
 330         }
 331
 332         glUseProgram(shadow_pass ? 0 : sdr_shadow_notex);
 333         machine->draw();
 334         glUseProgram(0);
 335
 336         glPopMatrix();
 337 }
 338
 339 static void reshape(int x, int y)
 340 {
 341         win_width = x;
 342         win_height = y;
 343
 344         glViewport(0, 0, x, y);
 345
 346         glMatrixMode(GL_PROJECTION);
 347         glLoadIdentity();
 348         gluPerspective(50.0, (float)x / (float)y, 0.01, 50.0);
 349 }
 350
 351 static void keyb(unsigned char key, int x, int y)
 352 {
 353         switch(key) {
 354         case 27:
 355                 exit(0);
 356
 357         case 'w':
 358                 opt_gear_wireframe = !opt_gear_wireframe;
 359                 glutPostRedisplay();
 360                 break;
 361
 362         case 's':
 363                 dbg_show_shadowmap = !dbg_show_shadowmap;
 364                 glutPostRedisplay();
 365                 break;
 366         }
 367 }
 368
 369 static void mouse(int bn, int st, int x, int y)
 370 {
 371         int bidx = bn - GLUT_LEFT_BUTTON;
 372         bool down = st == GLUT_DOWN;
 373
 374         prev_mx = x;
 375         prev_my = y;
 376         bnstate[bidx] = down;
 377
 378         if(bidx == 0) {
 379                 if(down) {
 380                         sel_gear = pick_gear(x, y);
 381                         sel_hit_pos = pick_hit.pos;
 382                 } else {
 383                         sel_gear = 0;
 384                 }
 385         }
 386
 387         if(bidx == 3 || bidx == 4) {    /* wheel */
 388                 if(hover_gear) {
 389                         float dz = bidx == 4 ? 1 : -1;
 390                         hover_gear->set_position(hover_gear->get_position() + hover_gear->get_axis() * dz);
 391                         machine->invalidate_meshing();
 392                 }
 393         }
 394 }
 395
 396 static void motion(int x, int y)
 397 {
 398         int dx = x - prev_mx;
 399         int dy = y - prev_my;
 400         prev_mx = x;
 401         prev_my = y;
 402
 403         if(!dx && !dy) return;
 404
 405         if(sel_gear) {
 406                 float speed = 0.5;
 407                 Vec3 offs = Vec3(dx * speed, -dy * speed, 0.0);
 408                 offs = sel_gear->get_dir_matrix() * offs;
 409
 410                 sel_gear->set_position(sel_gear->get_position() + offs);
 411                 machine->invalidate_meshing();
 412
 413         } else {
 414                 if(bnstate[0]) {
 415                         cam_theta += dx * 0.5;
 416                         cam_phi += dy * 0.5;
 417
 418                         if(cam_phi < -90) cam_phi = -90;
 419                         if(cam_phi > 90) cam_phi = 90;
 420                         glutPostRedisplay();
 421                 }
 422                 if(bnstate[2]) {
 423                         cam_dist += dy * 0.01;
 424                         if(cam_dist < 0.0) cam_dist = 0.0;
 425                         glutPostRedisplay();
 426                 }
 427         }
 428 }
 429
 430 static void passive_motion(int x, int y)
 431 {
 432         prev_mx = x;
 433         prev_my = y;
 434 }
 435
 436 static Gear *pick_gear(int x, int y)
 437 {
 438         double pt[3];
 439         double viewmat[16], projmat[16];
 440         int vp[4];
 441         Ray ray;
 442
 443         y = win_height - y;
 444
 445         glGetDoublev(GL_MODELVIEW_MATRIX, viewmat);
 446         glGetDoublev(GL_PROJECTION_MATRIX, projmat);
 447         glGetIntegerv(GL_VIEWPORT, vp);
 448
 449         gluUnProject(x, y, 0, viewmat, projmat, vp, pt, pt + 1, pt + 2);
 450         ray.origin = Vec3(pt[0], pt[1], pt[2]) * 1000.0f;
 451
 452         gluUnProject(x, y, 1, viewmat, projmat, vp, pt, pt + 1, pt + 2);
 453         ray.dir = Vec3(pt[0], pt[1], pt[2]) * 1000.0f - ray.origin;
 454
 455         return machine->intersect_gear(ray, &pick_hit);
 456 }