git.mutantstargoat.com Git - laserbrain_demo/blob - src/app.cc

   1 #include <stdio.h>
   2 #include <assert.h>
   3 #include <goatvr.h>
   4 #include "app.h"
   5 #include "opengl.h"
   6 #include "sdr.h"
   7 #include "texture.h"
   8 #include "mesh.h"
   9 #include "meshgen.h"
  10 #include "scene.h"
  11 #include "metascene.h"
  12 #include "datamap.h"
  13 #include "ui.h"
  14 #include "opt.h"
  15 #include "post.h"
  16 #include "renderer.h"
  17 #include "avatar.h"
  18 #include "vrinput.h"
  19 #include "exman.h"
  20 #include "blob_exhibit.h"
  21 #include "dbg_gui.h"
  22
  23 #define NEAR_CLIP       5.0
  24 #define FAR_CLIP        10000.0
  25
  26 static void draw_scene();
  27 static void toggle_flight();
  28 static void calc_framerate();
  29 static Ray calc_pick_ray(int x, int y);
  30
  31 long time_msec;
  32 int win_width, win_height;
  33 float win_aspect;
  34 bool fb_srgb;
  35 bool opt_gear_wireframe;
  36
  37 TextureSet texman;
  38 SceneSet sceneman;
  39
  40 unsigned int sdr_ltmap, sdr_ltmap_notex;
  41
  42 int fpexcept_enabled;
  43
  44 static Avatar avatar;
  45
  46 static float cam_dist = 0.0;
  47 static float floor_y;   // last floor height
  48 static float user_eye_height = 165;
  49
  50 static float walk_speed = 300.0f;
  51 static float mouse_speed = 0.5f;
  52 static bool show_walk_mesh, noclip = false;
  53
  54 static bool have_headtracking, have_handtracking, should_swap;
  55
  56 static int prev_mx, prev_my;
  57 static bool bnstate[8];
  58 static bool keystate[256];
  59 static bool gpad_bnstate[64];
  60 static Vec2 joy_move, joy_look;
  61 static float joy_deadzone = 0.01;
  62
  63 static float framerate;
  64
  65 static Mat4 view_matrix, mouse_view_matrix, proj_matrix;
  66 static MetaScene *mscn;
  67 static unsigned int sdr_post_gamma;
  68
  69 static long prev_msec;
  70
  71 static ExhibitManager *exman;
  72 static BlobExhibit *blobs;
  73 static bool show_blobs;
  74
  75 static ExSelection ex_sel;
  76
  77 static Renderer *rend;
  78
  79 static Ray last_pick_ray;
  80
  81
  82 bool app_init(int argc, char **argv)
  83 {
  84         set_log_file("demo.log");
  85
  86         char *env = getenv("FPEXCEPT");
  87         if(env && atoi(env)) {
  88                 info_log("enabling floating point exceptions\n");
  89                 fpexcept_enabled = 1;
  90                 enable_fpexcept();
  91         }
  92
  93         if(init_opengl() == -1) {
  94                 return false;
  95         }
  96
  97         if(!init_options(argc, argv, "demo.conf")) {
  98                 return false;
  99         }
 100         app_resize(opt.width, opt.height);
 101         app_fullscreen(opt.fullscreen);
 102
 103         if(opt.vr) {
 104                 if(goatvr_init() == -1) {
 105                         return false;
 106                 }
 107                 goatvr_set_origin_mode(GOATVR_HEAD);
 108                 goatvr_set_units_scale(100.0f);
 109
 110                 goatvr_startvr();
 111                 should_swap = goatvr_should_swap() != 0;
 112                 user_eye_height = goatvr_get_eye_height();
 113                 have_headtracking = goatvr_have_headtracking();
 114                 have_handtracking = goatvr_have_handtracking();
 115
 116                 goatvr_recenter();
 117         }
 118
 119         if(fb_srgb) {
 120                 int srgb_capable;
 121                 glGetIntegerv(GL_FRAMEBUFFER_SRGB_CAPABLE_EXT, &srgb_capable);
 122                 printf("Framebuffer %s sRGB-capable\n", srgb_capable ? "is" : "is not");
 123                 if(srgb_capable) {
 124                         glEnable(GL_FRAMEBUFFER_SRGB);
 125                 } else {
 126                         fb_srgb = 0;
 127                 }
 128         }
 129
 130         glEnable(GL_MULTISAMPLE);
 131         glEnable(GL_DEPTH_TEST);
 132         glEnable(GL_CULL_FACE);
 133         glEnable(GL_NORMALIZE);
 134
 135         if(!init_debug_gui()) {
 136                 return false;
 137         }
 138
 139         Mesh::use_custom_sdr_attr = false;
 140
 141         float ambient[] = {0.0, 0.0, 0.0, 0.0};
 142         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
 143
 144         glClearColor(1, 1, 1, 1);
 145
 146         init_audio();
 147
 148         if(!init_vrhands()) {
 149                 return false;
 150         }
 151
 152         mscn = new MetaScene;
 153         if(!mscn->load(opt.scenefile ? opt.scenefile : "data/museum.scene")) {
 154                 return false;
 155         }
 156
 157         avatar.pos = mscn->start_pos;
 158         Vec3 dir = rotate(Vec3(0, 0, 1), mscn->start_rot);
 159         dir.y = 0;
 160         avatar.body_rot = rad_to_deg(acos(dot(dir, Vec3(0, 0, 1))));
 161
 162         exman = new ExhibitManager;
 163         /*
 164         if(!exman->load(mscn, "data/exhibits")) {
 165                 //return false;
 166         }
 167         */
 168
 169         blobs = new BlobExhibit;
 170         blobs->node = new SceneNode;
 171         blobs->init();
 172         blobs->node->set_position(Vec3(-680, 160, -100));
 173         blobs->node->set_scaling(Vec3(28, 28, 28));
 174         blobs->node->update(0);
 175
 176         exman->add(blobs);
 177
 178         if(!(sdr_ltmap_notex = create_program_load("sdr/lightmap.v.glsl", "sdr/lightmap-notex.p.glsl"))) {
 179                 return false;
 180         }
 181         set_uniform_int(sdr_ltmap_notex, "texmap", MTL_TEX_DIFFUSE);
 182         set_uniform_int(sdr_ltmap_notex, "lightmap", MTL_TEX_LIGHTMAP);
 183
 184         if(!(sdr_ltmap = create_program_load("sdr/lightmap.v.glsl", "sdr/lightmap-tex.p.glsl"))) {
 185                 return false;
 186         }
 187         set_uniform_int(sdr_ltmap, "texmap", MTL_TEX_DIFFUSE);
 188         set_uniform_int(sdr_ltmap, "lightmap", MTL_TEX_LIGHTMAP);
 189
 190         if(!fb_srgb) {
 191                 sdr_post_gamma = create_program_load("sdr/post_gamma.v.glsl", "sdr/post_gamma.p.glsl");
 192         }
 193
 194         rend = new Renderer;
 195         rend->set_scene(mscn);
 196
 197         glUseProgram(0);
 198
 199         if(opt.vr || opt.fullscreen) {
 200                 app_grab_mouse(true);
 201         }
 202
 203         if(mscn->music && opt.music) {
 204                 mscn->music->play(AUDIO_PLAYMODE_LOOP);
 205         }
 206         return true;
 207 }
 208
 209 void app_cleanup()
 210 {
 211         if(mscn->music) {
 212                 mscn->music->stop();
 213         }
 214         destroy_audio();
 215
 216         app_grab_mouse(false);
 217         if(opt.vr) {
 218                 goatvr_shutdown();
 219         }
 220         destroy_vrhands();
 221
 222         delete rend;
 223
 224         delete exman;
 225
 226         texman.clear();
 227         sceneman.clear();
 228
 229         cleanup_debug_gui();
 230 }
 231
 232 static bool constrain_walk_mesh(const Vec3 &v, Vec3 *newv)
 233 {
 234         Mesh *wm = mscn->walk_mesh;
 235         if(!wm) {
 236                 *newv = v;
 237                 return true;
 238         }
 239
 240         Ray downray = Ray(v, Vec3(0, -1, 0));
 241         HitPoint hit;
 242         if(mscn->walk_mesh->intersect(downray, &hit)) {
 243                 *newv = hit.pos;
 244                 newv->y += user_eye_height;
 245                 return true;
 246         }
 247         return false;
 248 }
 249
 250 static void update(float dt)
 251 {
 252         texman.update();
 253         sceneman.update();
 254
 255         mscn->update(dt);
 256         exman->update(dt);
 257
 258         float speed = walk_speed * dt;
 259         Vec3 dir;
 260
 261         // joystick
 262         float jdeadsq = joy_deadzone * joy_deadzone;
 263         float jmove_lensq = length_sq(joy_move);
 264         float jlook_lensq = length_sq(joy_look);
 265
 266         if(jmove_lensq > jdeadsq) {
 267                 float len = sqrt(jmove_lensq);
 268                 jmove_lensq -= jdeadsq;
 269
 270                 float mag = len * len;
 271                 dir.x += mag * joy_move.x / len * 2.0 * speed;
 272                 dir.z += mag * joy_move.y / len * 2.0 * speed;
 273         }
 274         if(jlook_lensq > jdeadsq) {
 275                 float len = sqrt(jlook_lensq);
 276                 jlook_lensq -= jdeadsq;
 277
 278                 float mag = len * len;
 279                 avatar.body_rot += mag * joy_look.x / len * 200.0 * dt;
 280                 avatar.head_alt += mag * joy_look.y / len * 100.0 * dt;
 281                 if(avatar.head_alt < -90.0f) avatar.head_alt = -90.0f;
 282                 if(avatar.head_alt > 90.0f) avatar.head_alt = 90.0f;
 283         }
 284
 285         // keyboard move
 286         if(keystate[(int)'w']) {
 287                 dir.z -= speed;
 288         }
 289         if(keystate[(int)'s']) {
 290                 dir.z += speed;
 291         }
 292         if(keystate[(int)'d']) {
 293                 dir.x += speed;
 294         }
 295         if(keystate[(int)'a']) {
 296                 dir.x -= speed;
 297         }
 298         if(keystate[(int)'q'] || gpad_bnstate[GPAD_UP]) {
 299                 avatar.pos.y += speed;
 300         }
 301         if(keystate[(int)'z'] || gpad_bnstate[GPAD_DOWN]) {
 302                 avatar.pos.y -= speed;
 303         }
 304
 305         float theta = M_PI * avatar.body_rot / 180.0f;
 306         Vec3 newpos;
 307         newpos.x = avatar.pos.x + cos(theta) * dir.x - sin(theta) * dir.z;
 308         newpos.y = avatar.pos.y;
 309         newpos.z = avatar.pos.z + sin(theta) * dir.x + cos(theta) * dir.z;
 310
 311         if(noclip) {
 312                 avatar.pos = newpos;
 313         } else {
 314                 if(!constrain_walk_mesh(newpos, &avatar.pos)) {
 315                         float dtheta = M_PI / 32.0;
 316                         float theta = dtheta;
 317                         Vec2 dir2d = newpos.xz() - avatar.pos.xz();
 318
 319                         for(int i=0; i<16; i++) {
 320                                 Vec2 dvec = rotate(dir2d, theta);
 321                                 Vec3 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 322                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 323                                         break;
 324                                 }
 325                                 dvec = rotate(dir2d, -theta);
 326                                 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 327                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 328                                         break;
 329                                 }
 330                                 theta += dtheta;
 331                         }
 332                 }
 333                 floor_y = avatar.pos.y - user_eye_height;
 334         }
 335
 336         // TODO move to avatar
 337         // calculate mouselook view matrix
 338         mouse_view_matrix = Mat4::identity;
 339         mouse_view_matrix.pre_translate(0, 0, -cam_dist);
 340         if(!have_headtracking) {
 341                 mouse_view_matrix.pre_rotate_x(deg_to_rad(avatar.head_alt));
 342         }
 343         mouse_view_matrix.pre_rotate_y(deg_to_rad(avatar.body_rot));
 344         mouse_view_matrix.pre_translate(-avatar.pos.x, -avatar.pos.y, -avatar.pos.z);
 345
 346         // update hand-tracking
 347         if(have_handtracking) {
 348                 update_vrhands(&avatar);
 349         }
 350 }
 351
 352 void app_display()
 353 {
 354         float dt = (float)(time_msec - prev_msec) / 1000.0f;
 355         prev_msec = time_msec;
 356
 357         if(debug_gui) {
 358                 ImGui::GetIOPtr()->DeltaTime = dt;
 359                 ImGui::NewFrame();
 360
 361                 ImGui::ShowTestWindow();
 362         }
 363
 364         if(opt.vr) {
 365                 // VR mode
 366                 goatvr_draw_start();
 367                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 368
 369                 update(dt);
 370
 371                 for(int i=0; i<2; i++) {
 372                         // for each eye
 373                         goatvr_draw_eye(i);
 374
 375                         proj_matrix = goatvr_projection_matrix(i, NEAR_CLIP, FAR_CLIP);
 376                         glMatrixMode(GL_PROJECTION);
 377                         glLoadMatrixf(proj_matrix[0]);
 378
 379                         view_matrix = mouse_view_matrix * Mat4(goatvr_view_matrix(i));
 380                         glMatrixMode(GL_MODELVIEW);
 381                         glLoadMatrixf(view_matrix[0]);
 382
 383                         draw_scene();
 384                         if(have_handtracking) {
 385                                 draw_vrhands();
 386                         }
 387
 388                         if(debug_gui) {
 389                                 ImGui::Render();
 390                         }
 391                 }
 392                 goatvr_draw_done();
 393
 394                 if(should_swap) {
 395                         app_swap_buffers();
 396                 }
 397
 398         } else {
 399                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 400
 401                 update(dt);
 402
 403                 proj_matrix.perspective(deg_to_rad(50.0), win_aspect, NEAR_CLIP, FAR_CLIP);
 404                 glMatrixMode(GL_PROJECTION);
 405                 glLoadMatrixf(proj_matrix[0]);
 406
 407                 view_matrix = mouse_view_matrix;
 408                 glMatrixMode(GL_MODELVIEW);
 409                 glLoadMatrixf(view_matrix[0]);
 410
 411                 draw_scene();
 412
 413                 if(!fb_srgb && sdr_post_gamma) {
 414                         slow_post(sdr_post_gamma);
 415                         glUseProgram(0);
 416                 }
 417
 418                 if(debug_gui) {
 419                         ImGui::Render();
 420                 }
 421                 app_swap_buffers();
 422         }
 423         assert(glGetError() == GL_NO_ERROR);
 424
 425         calc_framerate();
 426 }
 427
 428
 429 static void draw_scene()
 430 {
 431         rend->draw();
 432         exman->draw();
 433
 434         /*
 435         if(have_handtracking) {
 436                 Mat4 head_xform = inverse(mouse_view_matrix);//goatvr_head_matrix();
 437                 Mat4 head_dir_xform = head_xform.upper3x3();
 438
 439                 glUseProgram(0);
 440                 glPushAttrib(GL_ENABLE_BIT);
 441                 glDisable(GL_LIGHTING);
 442                 glBegin(GL_LINES);
 443                 for(int i=0; i<2; i++) {
 444                         if(hand[i].valid) {
 445                                 glColor3f(i, 1 - i, i);
 446                         } else {
 447                                 glColor3f(0.5, 0.5, 0.5);
 448                         }
 449                         Vec3 v = head_xform * hand[i].pos;
 450                         Vec3 dir = head_dir_xform * rotate(Vec3(0, 0, -1), hand[i].rot) * 20.0f;
 451                         Vec3 up = head_dir_xform * rotate(Vec3(0, 1, 0), hand[i].rot) * 10.0f;
 452                         Vec3 right = head_dir_xform * rotate(Vec3(1, 0, 0), hand[i].rot) * 10.0f;
 453
 454                         glVertex3f(v.x, v.y, v.z);
 455                         glVertex3f(v.x + dir.x, v.y + dir.y, v.z + dir.z);
 456                         glVertex3f(v.x - right.x, v.y - right.y, v.z - right.z);
 457                         glVertex3f(v.x + right.x, v.y + right.y, v.z + right.z);
 458                         glVertex3f(v.x - up.x, v.y - up.y, v.z - up.z);
 459                         glVertex3f(v.x + up.x, v.y + up.y, v.z + up.z);
 460                 }
 461                 glEnd();
 462                 glPopAttrib();
 463         }
 464         */
 465
 466         if(show_walk_mesh && mscn->walk_mesh) {
 467                 glPushAttrib(GL_ENABLE_BIT);
 468                 glEnable(GL_BLEND);
 469                 glBlendFunc(GL_ONE, GL_ONE);
 470                 glEnable(GL_POLYGON_OFFSET_FILL);
 471
 472                 glUseProgram(0);
 473
 474                 glPolygonOffset(-1, 1);
 475                 glDepthMask(0);
 476
 477                 glColor3f(0.3, 0.08, 0.01);
 478                 mscn->walk_mesh->draw();
 479
 480                 glDepthMask(1);
 481
 482                 glPopAttrib();
 483         }
 484
 485         print_text(Vec2(9 * win_width / 10, 20), Vec3(1, 1, 0), "fps: %.1f", framerate);
 486         draw_ui();
 487 }
 488
 489
 490 void app_reshape(int x, int y)
 491 {
 492         glViewport(0, 0, x, y);
 493         goatvr_set_fb_size(x, y, 1.0f);
 494         debug_gui_reshape(x, y);
 495 }
 496
 497 void app_keyboard(int key, bool pressed)
 498 {
 499         unsigned int mod = app_get_modifiers();
 500
 501         if(debug_gui && !(pressed && (key == '`' || key == 27))) {
 502                 debug_gui_key(key, pressed, mod);
 503                 return; // ignore all keystrokes when GUI is visible
 504         }
 505
 506         if(pressed) {
 507                 switch(key) {
 508                 case 27:
 509                         app_quit();
 510                         break;
 511
 512                 case '\n':
 513                 case '\r':
 514                         if(mod & MOD_ALT) {
 515                                 app_toggle_fullscreen();
 516                         }
 517                         break;
 518
 519                 case '`':
 520                         debug_gui = !debug_gui;
 521                         show_message("debug gui %s", debug_gui ? "enabled" : "disabled");
 522                         break;
 523
 524                 case 'm':
 525                         app_toggle_grab_mouse();
 526                         show_message("mouse %s", app_is_mouse_grabbed() ? "grabbed" : "released");
 527                         break;
 528
 529                 case 'w':
 530                         if(mod & MOD_CTRL) {
 531                                 show_walk_mesh = !show_walk_mesh;
 532                                 show_message("walk mesh: %s", show_walk_mesh ? "on" : "off");
 533                         }
 534                         break;
 535
 536                 case 'c':
 537                         if(mod & MOD_CTRL) {
 538                                 noclip = !noclip;
 539                                 show_message(noclip ? "no clip" : "clip");
 540                         }
 541                         break;
 542
 543                 case 'f':
 544                         toggle_flight();
 545                         break;
 546
 547                 case 'p':
 548                         if(mod & MOD_CTRL) {
 549                                 fb_srgb = !fb_srgb;
 550                                 show_message("gamma correction for non-sRGB framebuffers: %s\n", fb_srgb ? "off" : "on");
 551                         }
 552                         break;
 553
 554                 case '=':
 555                         walk_speed *= 1.25;
 556                         show_message("walk speed: %g", walk_speed);
 557                         break;
 558
 559                 case '-':
 560                         walk_speed *= 0.75;
 561                         show_message("walk speed: %g", walk_speed);
 562                         break;
 563
 564                 case ']':
 565                         mouse_speed *= 1.2;
 566                         show_message("mouse speed: %g", mouse_speed);
 567                         break;
 568
 569                 case '[':
 570                         mouse_speed *= 0.8;
 571                         show_message("mouse speed: %g", mouse_speed);
 572                         break;
 573
 574                 case 'b':
 575                         show_blobs = !show_blobs;
 576                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 577                         break;
 578
 579                 case ' ':
 580                         goatvr_recenter();
 581                         show_message("VR recenter\n");
 582                         break;
 583
 584                 case 'x':
 585                         exman->load(mscn, "data/exhibits");
 586                         break;
 587                 }
 588         }
 589
 590         if(key < 256 && !(mod & (MOD_CTRL | MOD_ALT))) {
 591                 keystate[key] = pressed;
 592         }
 593 }
 594
 595 void app_mouse_button(int bn, bool pressed, int x, int y)
 596 {
 597         if(debug_gui) {
 598                 debug_gui_mbutton(bn, pressed, x, y);
 599                 return; // ignore mouse events while GUI is visible
 600         }
 601
 602         prev_mx = x;
 603         prev_my = y;
 604         bnstate[bn] = pressed;
 605
 606         if(bn == 0) {
 607                 if(!pressed) {
 608                         if(ex_sel.ex) {
 609                                 ex_sel.ex = 0;
 610                         } else {
 611                                 Ray ray = calc_pick_ray(x, y);
 612                                 ex_sel = exman->select(ray);
 613                         }
 614                 }
 615         }
 616 }
 617
 618 static inline void mouse_look(float dx, float dy)
 619 {
 620         float scrsz = (float)win_height;
 621         avatar.body_rot += dx * 512.0 / scrsz;
 622         avatar.head_alt += dy * 512.0 / scrsz;
 623
 624         if(avatar.head_alt < -90) avatar.head_alt = -90;
 625         if(avatar.head_alt > 90) avatar.head_alt = 90;
 626 }
 627
 628 static void mouse_zoom(float dx, float dy)
 629 {
 630         cam_dist += dy * 0.1;
 631         if(cam_dist < 0.0) cam_dist = 0.0;
 632 }
 633
 634 void app_mouse_motion(int x, int y)
 635 {
 636         if(debug_gui) {
 637                 debug_gui_mmotion(x, y);
 638                 return; // ignore mouse events while GUI is visible
 639         }
 640
 641         int dx = x - prev_mx;
 642         int dy = y - prev_my;
 643         prev_mx = x;
 644         prev_my = y;
 645
 646         if(!dx && !dy) return;
 647
 648         if(ex_sel.ex) {
 649                 Vec3 pos = ex_sel.ex->node->get_node_position();
 650                 Vec3 dir = transpose(view_matrix.upper3x3()) * Vec3(dx * 1.0, dy * -1.0, 0);
 651
 652                 ex_sel.ex->node->set_position(pos + dir);
 653         }
 654
 655         if(bnstate[2]) {
 656                 mouse_look(dx, dy);
 657         }
 658 }
 659
 660 void app_mouse_delta(int dx, int dy)
 661 {
 662         if(bnstate[2]) {
 663                 mouse_zoom(dx * mouse_speed, dy * mouse_speed);
 664         } else {
 665                 mouse_look(dx * mouse_speed, dy * mouse_speed);
 666         }
 667 }
 668
 669 void app_mouse_wheel(int dir)
 670 {
 671         if(debug_gui) {
 672                 debug_gui_wheel(dir);
 673         }
 674 }
 675
 676 void app_gamepad_axis(int axis, float val)
 677 {
 678         switch(axis) {
 679         case 0:
 680                 joy_move.x = val;
 681                 break;
 682         case 1:
 683                 joy_move.y = val;
 684                 break;
 685
 686         case 2:
 687                 joy_look.x = val;
 688                 break;
 689         case 3:
 690                 joy_look.y = val;
 691                 break;
 692         }
 693 }
 694
 695 void app_gamepad_button(int bn, bool pressed)
 696 {
 697         gpad_bnstate[bn] = pressed;
 698
 699         if(pressed) {
 700                 switch(bn) {
 701                 case GPAD_LSTICK:
 702                         toggle_flight();
 703                         break;
 704
 705                 case GPAD_X:
 706                         show_blobs = !show_blobs;
 707                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 708                         break;
 709
 710                 case GPAD_START:
 711                         goatvr_recenter();
 712                         show_message("VR recenter\n");
 713                         break;
 714
 715                 default:
 716                         break;
 717                 }
 718         }
 719 }
 720
 721 static void toggle_flight()
 722 {
 723         static float prev_walk_speed = -1.0;
 724         if(prev_walk_speed < 0.0) {
 725                 noclip = true;
 726                 prev_walk_speed = walk_speed;
 727                 walk_speed = 1000.0;
 728                 show_message("fly mode\n");
 729         } else {
 730                 noclip = false;
 731                 walk_speed = prev_walk_speed;
 732                 prev_walk_speed = -1.0;
 733                 show_message("walk mode\n");
 734         }
 735 }
 736
 737 static void calc_framerate()
 738 {
 739         //static int ncalc;
 740         static int nframes;
 741         static long prev_upd;
 742
 743         long elapsed = time_msec - prev_upd;
 744         if(elapsed >= 1000) {
 745                 framerate = (float)nframes / (float)(elapsed * 0.001);
 746                 nframes = 1;
 747                 prev_upd = time_msec;
 748
 749                 /*if(++ncalc >= 5) {
 750                         printf("fps: %f\n", framerate);
 751                         ncalc = 0;
 752                 }*/
 753         } else {
 754                 ++nframes;
 755         }
 756 }
 757
 758 static Ray calc_pick_ray(int x, int y)
 759 {
 760         float nx = (float)x / (float)win_width;
 761         float ny = (float)(win_height - y) / (float)win_height;
 762
 763         last_pick_ray = mouse_pick_ray(nx, ny, view_matrix, proj_matrix);
 764         return last_pick_ray;
 765 }