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
  30 long time_msec;
  31 int win_width, win_height;
  32 float win_aspect;
  33 bool fb_srgb;
  34 bool opt_gear_wireframe;
  35
  36 TextureSet texman;
  37 SceneSet sceneman;
  38
  39 unsigned int sdr_ltmap, sdr_ltmap_notex;
  40
  41 static Avatar avatar;
  42
  43 static float cam_dist = 0.0;
  44 static float floor_y;   // last floor height
  45 static float user_eye_height = 165;
  46
  47 static float walk_speed = 300.0f;
  48 static float mouse_speed = 0.5f;
  49 static bool show_walk_mesh, noclip = false;
  50
  51 static bool have_headtracking, have_handtracking, should_swap;
  52
  53 static int prev_mx, prev_my;
  54 static bool bnstate[8];
  55 static bool keystate[256];
  56 static bool gpad_bnstate[64];
  57 static Vec2 joy_move, joy_look;
  58 static float joy_deadzone = 0.01;
  59
  60 static float framerate;
  61
  62 static Mat4 view_matrix, mouse_view_matrix, proj_matrix;
  63 static MetaScene *mscn;
  64 static unsigned int sdr_post_gamma;
  65
  66 static long prev_msec;
  67
  68 static ExhibitManager *exman;
  69 static BlobExhibit *blobs;
  70 static bool show_blobs;
  71
  72 static Renderer *rend;
  73
  74
  75 bool app_init(int argc, char **argv)
  76 {
  77         if(!init_options(argc, argv, "demo.conf")) {
  78                 return false;
  79         }
  80         app_resize(opt.width, opt.height);
  81         app_fullscreen(opt.fullscreen);
  82
  83         if(opt.vr) {
  84                 if(goatvr_init() == -1) {
  85                         return false;
  86                 }
  87                 goatvr_set_origin_mode(GOATVR_HEAD);
  88                 goatvr_set_units_scale(100.0f);
  89
  90                 goatvr_startvr();
  91                 should_swap = goatvr_should_swap() != 0;
  92                 user_eye_height = goatvr_get_eye_height();
  93                 have_headtracking = goatvr_have_headtracking();
  94                 have_handtracking = goatvr_have_handtracking();
  95
  96                 goatvr_recenter();
  97         }
  98
  99         if(fb_srgb) {
 100                 int srgb_capable;
 101                 glGetIntegerv(GL_FRAMEBUFFER_SRGB_CAPABLE_EXT, &srgb_capable);
 102                 printf("Framebuffer %s sRGB-capable\n", srgb_capable ? "is" : "is not");
 103                 if(srgb_capable) {
 104                         glEnable(GL_FRAMEBUFFER_SRGB);
 105                 } else {
 106                         fb_srgb = 0;
 107                 }
 108         }
 109
 110         glEnable(GL_MULTISAMPLE);
 111         glEnable(GL_DEPTH_TEST);
 112         glEnable(GL_CULL_FACE);
 113         glEnable(GL_LIGHTING);
 114         glEnable(GL_NORMALIZE);
 115
 116         if(!init_debug_gui()) {
 117                 return false;
 118         }
 119
 120         Mesh::use_custom_sdr_attr = false;
 121
 122         float ambient[] = {0.0, 0.0, 0.0, 0.0};
 123         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
 124
 125         glClearColor(1, 1, 1, 1);
 126
 127         init_audio();
 128
 129         if(!init_vrhands()) {
 130                 return false;
 131         }
 132
 133         mscn = new MetaScene;
 134         if(!mscn->load(opt.scenefile ? opt.scenefile : "data/museum.scene")) {
 135                 return false;
 136         }
 137
 138         avatar.pos = mscn->start_pos;
 139         Vec3 dir = rotate(Vec3(0, 0, 1), mscn->start_rot);
 140         dir.y = 0;
 141         avatar.body_rot = rad_to_deg(acos(dot(dir, Vec3(0, 0, 1))));
 142
 143         exman = new ExhibitManager;
 144         if(!exman->load(mscn, "data/exhibits")) {
 145                 //return false;
 146         }
 147
 148         blobs = new BlobExhibit;
 149         blobs->node = new SceneNode;
 150         blobs->init();
 151         blobs->node->set_position(Vec3(-680, 160, -100));
 152         blobs->node->set_scaling(Vec3(28, 28, 28));
 153         blobs->node->update(0);
 154
 155         exman->add(blobs);
 156
 157         if(!(sdr_ltmap_notex = create_program_load("sdr/lightmap.v.glsl", "sdr/lightmap-notex.p.glsl"))) {
 158                 return false;
 159         }
 160         set_uniform_int(sdr_ltmap_notex, "texmap", MTL_TEX_DIFFUSE);
 161         set_uniform_int(sdr_ltmap_notex, "lightmap", MTL_TEX_LIGHTMAP);
 162
 163         if(!(sdr_ltmap = create_program_load("sdr/lightmap.v.glsl", "sdr/lightmap-tex.p.glsl"))) {
 164                 return false;
 165         }
 166         set_uniform_int(sdr_ltmap, "texmap", MTL_TEX_DIFFUSE);
 167         set_uniform_int(sdr_ltmap, "lightmap", MTL_TEX_LIGHTMAP);
 168
 169         if(!fb_srgb) {
 170                 sdr_post_gamma = create_program_load("sdr/post_gamma.v.glsl", "sdr/post_gamma.p.glsl");
 171         }
 172
 173         rend = new Renderer;
 174         rend->set_scene(mscn);
 175
 176         glUseProgram(0);
 177
 178         if(opt.vr || opt.fullscreen) {
 179                 app_grab_mouse(true);
 180         }
 181
 182         if(mscn->music && opt.music) {
 183                 mscn->music->play(AUDIO_PLAYMODE_LOOP);
 184         }
 185         return true;
 186 }
 187
 188 void app_cleanup()
 189 {
 190         if(mscn->music) {
 191                 mscn->music->stop();
 192         }
 193         destroy_audio();
 194
 195         app_grab_mouse(false);
 196         if(opt.vr) {
 197                 goatvr_shutdown();
 198         }
 199         destroy_vrhands();
 200
 201         delete rend;
 202
 203         delete exman;
 204
 205         texman.clear();
 206         sceneman.clear();
 207
 208         cleanup_debug_gui();
 209 }
 210
 211 static bool constrain_walk_mesh(const Vec3 &v, Vec3 *newv)
 212 {
 213         Mesh *wm = mscn->walk_mesh;
 214         if(!wm) {
 215                 *newv = v;
 216                 return true;
 217         }
 218
 219         Ray downray = Ray(v, Vec3(0, -1, 0));
 220         HitPoint hit;
 221         if(mscn->walk_mesh->intersect(downray, &hit)) {
 222                 *newv = hit.pos;
 223                 newv->y += user_eye_height;
 224                 return true;
 225         }
 226         return false;
 227 }
 228
 229 static void update(float dt)
 230 {
 231         texman.update();
 232         sceneman.update();
 233
 234         mscn->update(dt);
 235         exman->update(dt);
 236
 237         float speed = walk_speed * dt;
 238         Vec3 dir;
 239
 240         // joystick
 241         float jdeadsq = joy_deadzone * joy_deadzone;
 242         float jmove_lensq = length_sq(joy_move);
 243         float jlook_lensq = length_sq(joy_look);
 244
 245         if(jmove_lensq > jdeadsq) {
 246                 float len = sqrt(jmove_lensq);
 247                 jmove_lensq -= jdeadsq;
 248
 249                 float mag = len * len;
 250                 dir.x += mag * joy_move.x / len * 2.0 * speed;
 251                 dir.z += mag * joy_move.y / len * 2.0 * speed;
 252         }
 253         if(jlook_lensq > jdeadsq) {
 254                 float len = sqrt(jlook_lensq);
 255                 jlook_lensq -= jdeadsq;
 256
 257                 float mag = len * len;
 258                 avatar.body_rot += mag * joy_look.x / len * 200.0 * dt;
 259                 avatar.head_alt += mag * joy_look.y / len * 100.0 * dt;
 260                 if(avatar.head_alt < -90.0f) avatar.head_alt = -90.0f;
 261                 if(avatar.head_alt > 90.0f) avatar.head_alt = 90.0f;
 262         }
 263
 264         // keyboard move
 265         if(keystate[(int)'w']) {
 266                 dir.z -= speed;
 267         }
 268         if(keystate[(int)'s']) {
 269                 dir.z += speed;
 270         }
 271         if(keystate[(int)'d']) {
 272                 dir.x += speed;
 273         }
 274         if(keystate[(int)'a']) {
 275                 dir.x -= speed;
 276         }
 277         if(keystate[(int)'q'] || gpad_bnstate[GPAD_UP]) {
 278                 avatar.pos.y += speed;
 279         }
 280         if(keystate[(int)'z'] || gpad_bnstate[GPAD_DOWN]) {
 281                 avatar.pos.y -= speed;
 282         }
 283
 284         float theta = M_PI * avatar.body_rot / 180.0f;
 285         Vec3 newpos;
 286         newpos.x = avatar.pos.x + cos(theta) * dir.x - sin(theta) * dir.z;
 287         newpos.y = avatar.pos.y;
 288         newpos.z = avatar.pos.z + sin(theta) * dir.x + cos(theta) * dir.z;
 289
 290         if(noclip) {
 291                 avatar.pos = newpos;
 292         } else {
 293                 if(!constrain_walk_mesh(newpos, &avatar.pos)) {
 294                         float dtheta = M_PI / 32.0;
 295                         float theta = dtheta;
 296                         Vec2 dir2d = newpos.xz() - avatar.pos.xz();
 297
 298                         for(int i=0; i<16; i++) {
 299                                 Vec2 dvec = rotate(dir2d, theta);
 300                                 Vec3 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 301                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 302                                         break;
 303                                 }
 304                                 dvec = rotate(dir2d, -theta);
 305                                 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 306                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 307                                         break;
 308                                 }
 309                                 theta += dtheta;
 310                         }
 311                 }
 312                 floor_y = avatar.pos.y - user_eye_height;
 313         }
 314
 315         // TODO move to avatar
 316         // calculate mouselook view matrix
 317         mouse_view_matrix = Mat4::identity;
 318         mouse_view_matrix.pre_translate(0, 0, -cam_dist);
 319         if(!have_headtracking) {
 320                 mouse_view_matrix.pre_rotate_x(deg_to_rad(avatar.head_alt));
 321         }
 322         mouse_view_matrix.pre_rotate_y(deg_to_rad(avatar.body_rot));
 323         mouse_view_matrix.pre_translate(-avatar.pos.x, -avatar.pos.y, -avatar.pos.z);
 324
 325         // update hand-tracking
 326         if(have_handtracking) {
 327                 update_vrhands(&avatar);
 328         }
 329 }
 330
 331 static void set_light(int idx, const Vec3 &pos, const Vec3 &color)
 332 {
 333         unsigned int lt = GL_LIGHT0 + idx;
 334         float posv[] = { pos.x, pos.y, pos.z, 1 };
 335         float colv[] = { color.x, color.y, color.z, 1 };
 336
 337         glEnable(lt);
 338         glLightfv(lt, GL_POSITION, posv);
 339         glLightfv(lt, GL_DIFFUSE, colv);
 340         glLightfv(lt, GL_SPECULAR, colv);
 341 }
 342
 343 void app_display()
 344 {
 345         float dt = (float)(time_msec - prev_msec) / 1000.0f;
 346         prev_msec = time_msec;
 347
 348         if(debug_gui) {
 349                 ImGui::GetIOPtr()->DeltaTime = dt;
 350                 ImGui::NewFrame();
 351
 352                 ImGui::ShowTestWindow();
 353         }
 354
 355         if(opt.vr) {
 356                 // VR mode
 357                 goatvr_draw_start();
 358                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 359
 360                 update(dt);
 361
 362                 for(int i=0; i<2; i++) {
 363                         // for each eye
 364                         goatvr_draw_eye(i);
 365
 366                         proj_matrix = goatvr_projection_matrix(i, NEAR_CLIP, FAR_CLIP);
 367                         glMatrixMode(GL_PROJECTION);
 368                         glLoadMatrixf(proj_matrix[0]);
 369
 370                         view_matrix = mouse_view_matrix * Mat4(goatvr_view_matrix(i));
 371                         glMatrixMode(GL_MODELVIEW);
 372                         glLoadMatrixf(view_matrix[0]);
 373
 374                         draw_scene();
 375                         if(have_handtracking) {
 376                                 draw_vrhands();
 377                         }
 378
 379                         if(debug_gui) {
 380                                 ImGui::Render();
 381                         }
 382                 }
 383                 goatvr_draw_done();
 384
 385                 if(should_swap) {
 386                         app_swap_buffers();
 387                 }
 388
 389         } else {
 390                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 391
 392                 update(dt);
 393
 394                 proj_matrix.perspective(deg_to_rad(50.0), win_aspect, NEAR_CLIP, FAR_CLIP);
 395                 glMatrixMode(GL_PROJECTION);
 396                 glLoadMatrixf(proj_matrix[0]);
 397
 398                 view_matrix = mouse_view_matrix;
 399                 glMatrixMode(GL_MODELVIEW);
 400                 glLoadMatrixf(view_matrix[0]);
 401
 402                 draw_scene();
 403
 404                 if(!fb_srgb && sdr_post_gamma) {
 405                         slow_post(sdr_post_gamma);
 406                         glUseProgram(0);
 407                 }
 408
 409                 if(debug_gui) {
 410                         ImGui::Render();
 411                 }
 412                 app_swap_buffers();
 413         }
 414         assert(glGetError() == GL_NO_ERROR);
 415
 416         calc_framerate();
 417 }
 418
 419
 420 static void draw_scene()
 421 {
 422         static const Vec3 lpos[] = { Vec3(-50, 75, 100), Vec3(100, 0, 30), Vec3(-10, -10, 60) };
 423         set_light(0, lpos[0], Vec3(1.0, 0.8, 0.7) * 0.8);
 424         set_light(1, lpos[1], Vec3(0.6, 0.7, 1.0) * 0.6);
 425         set_light(2, lpos[2], Vec3(0.8, 1.0, 0.8) * 0.3);
 426
 427         rend->draw();
 428
 429         if(show_blobs) {
 430                 blobs->draw();
 431         }
 432
 433         /*
 434         if(have_handtracking) {
 435                 Mat4 head_xform = inverse(mouse_view_matrix);//goatvr_head_matrix();
 436                 Mat4 head_dir_xform = head_xform.upper3x3();
 437
 438                 glUseProgram(0);
 439                 glPushAttrib(GL_ENABLE_BIT);
 440                 glDisable(GL_LIGHTING);
 441                 glBegin(GL_LINES);
 442                 for(int i=0; i<2; i++) {
 443                         if(hand[i].valid) {
 444                                 glColor3f(i, 1 - i, i);
 445                         } else {
 446                                 glColor3f(0.5, 0.5, 0.5);
 447                         }
 448                         Vec3 v = head_xform * hand[i].pos;
 449                         Vec3 dir = head_dir_xform * rotate(Vec3(0, 0, -1), hand[i].rot) * 20.0f;
 450                         Vec3 up = head_dir_xform * rotate(Vec3(0, 1, 0), hand[i].rot) * 10.0f;
 451                         Vec3 right = head_dir_xform * rotate(Vec3(1, 0, 0), hand[i].rot) * 10.0f;
 452
 453                         glVertex3f(v.x, v.y, v.z);
 454                         glVertex3f(v.x + dir.x, v.y + dir.y, v.z + dir.z);
 455                         glVertex3f(v.x - right.x, v.y - right.y, v.z - right.z);
 456                         glVertex3f(v.x + right.x, v.y + right.y, v.z + right.z);
 457                         glVertex3f(v.x - up.x, v.y - up.y, v.z - up.z);
 458                         glVertex3f(v.x + up.x, v.y + up.y, v.z + up.z);
 459                 }
 460                 glEnd();
 461                 glPopAttrib();
 462         }
 463         */
 464
 465         if(show_walk_mesh && mscn->walk_mesh) {
 466                 glPushAttrib(GL_ENABLE_BIT);
 467                 glEnable(GL_BLEND);
 468                 glBlendFunc(GL_ONE, GL_ONE);
 469                 glDisable(GL_LIGHTING);
 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         }
 585
 586         if(key < 256 && !(mod & (MOD_CTRL | MOD_ALT))) {
 587                 keystate[key] = pressed;
 588         }
 589 }
 590
 591 void app_mouse_button(int bn, bool pressed, int x, int y)
 592 {
 593         if(debug_gui) {
 594                 debug_gui_mbutton(bn, pressed, x, y);
 595                 return; // ignore mouse events while GUI is visible
 596         }
 597
 598         prev_mx = x;
 599         prev_my = y;
 600         bnstate[bn] = pressed;
 601 }
 602
 603 static inline void mouse_look(float dx, float dy)
 604 {
 605         float scrsz = (float)win_height;
 606         avatar.body_rot += dx * 512.0 / scrsz;
 607         avatar.head_alt += dy * 512.0 / scrsz;
 608
 609         if(avatar.head_alt < -90) avatar.head_alt = -90;
 610         if(avatar.head_alt > 90) avatar.head_alt = 90;
 611 }
 612
 613 static void mouse_zoom(float dx, float dy)
 614 {
 615         cam_dist += dy * 0.1;
 616         if(cam_dist < 0.0) cam_dist = 0.0;
 617 }
 618
 619 void app_mouse_motion(int x, int y)
 620 {
 621         if(debug_gui) {
 622                 debug_gui_mmotion(x, y);
 623                 return; // ignore mouse events while GUI is visible
 624         }
 625
 626         int dx = x - prev_mx;
 627         int dy = y - prev_my;
 628         prev_mx = x;
 629         prev_my = y;
 630
 631         if(!dx && !dy) return;
 632
 633         if(bnstate[0]) {
 634                 mouse_look(dx, dy);
 635         }
 636         if(bnstate[2]) {
 637                 mouse_zoom(dx, dy);
 638         }
 639 }
 640
 641 void app_mouse_delta(int dx, int dy)
 642 {
 643         if(bnstate[2]) {
 644                 mouse_zoom(dx * mouse_speed, dy * mouse_speed);
 645         } else {
 646                 mouse_look(dx * mouse_speed, dy * mouse_speed);
 647         }
 648 }
 649
 650 void app_mouse_wheel(int dir)
 651 {
 652         if(debug_gui) {
 653                 debug_gui_wheel(dir);
 654         }
 655 }
 656
 657 void app_gamepad_axis(int axis, float val)
 658 {
 659         switch(axis) {
 660         case 0:
 661                 joy_move.x = val;
 662                 break;
 663         case 1:
 664                 joy_move.y = val;
 665                 break;
 666
 667         case 2:
 668                 joy_look.x = val;
 669                 break;
 670         case 3:
 671                 joy_look.y = val;
 672                 break;
 673         }
 674 }
 675
 676 void app_gamepad_button(int bn, bool pressed)
 677 {
 678         gpad_bnstate[bn] = pressed;
 679
 680         if(pressed) {
 681                 switch(bn) {
 682                 case GPAD_LSTICK:
 683                         toggle_flight();
 684                         break;
 685
 686                 case GPAD_X:
 687                         show_blobs = !show_blobs;
 688                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 689                         break;
 690
 691                 case GPAD_START:
 692                         goatvr_recenter();
 693                         show_message("VR recenter\n");
 694                         break;
 695
 696                 default:
 697                         break;
 698                 }
 699         }
 700 }
 701
 702 static void toggle_flight()
 703 {
 704         static float prev_walk_speed = -1.0;
 705         if(prev_walk_speed < 0.0) {
 706                 noclip = true;
 707                 prev_walk_speed = walk_speed;
 708                 walk_speed = 1000.0;
 709                 show_message("fly mode\n");
 710         } else {
 711                 noclip = false;
 712                 walk_speed = prev_walk_speed;
 713                 prev_walk_speed = -1.0;
 714                 show_message("walk mode\n");
 715         }
 716 }
 717
 718 static void calc_framerate()
 719 {
 720         static int ncalc;
 721         static int nframes;
 722         static long prev_upd;
 723
 724         long elapsed = time_msec - prev_upd;
 725         if(elapsed >= 1000) {
 726                 framerate = (float)nframes / (float)(elapsed * 0.001);
 727                 nframes = 1;
 728                 prev_upd = time_msec;
 729
 730                 /*if(++ncalc >= 5) {
 731                         printf("fps: %f\n", framerate);
 732                         ncalc = 0;
 733                 }*/
 734         } else {
 735                 ++nframes;
 736         }
 737 }