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

   1 #include <stdio.h>
   2 #include <limits.h>
   3 #include <assert.h>
   4 #include <goatvr.h>
   5 #include "app.h"
   6 #include "opengl.h"
   7 #include "sdr.h"
   8 #include "texture.h"
   9 #include "mesh.h"
  10 #include "meshgen.h"
  11 #include "scene.h"
  12 #include "metascene.h"
  13 #include "datamap.h"
  14 #include "ui.h"
  15 #include "opt.h"
  16 #include "post.h"
  17 #include "renderer.h"
  18 #include "avatar.h"
  19 #include "vrinput.h"
  20 #include "exman.h"
  21 #include "blob_exhibit.h"
  22 #include "dbg_gui.h"
  23 #include "geomdraw.h"
  24 #include "ui_exhibit.h"
  25
  26 #define NEAR_CLIP       5.0
  27 #define FAR_CLIP        10000.0
  28
  29 static void draw_scene();
  30 static void toggle_flight();
  31 static void calc_framerate();
  32 static Ray calc_pick_ray(int x, int y);
  33
  34 long time_msec;
  35 int win_width, win_height;
  36 float win_aspect;
  37 bool fb_srgb;
  38 bool opt_gear_wireframe;
  39
  40 TextureSet texman;
  41 SceneSet sceneman;
  42
  43 unsigned int sdr_ltmap, sdr_ltmap_notex;
  44
  45 int fpexcept_enabled;
  46
  47 static Avatar avatar;
  48
  49 static float cam_dist = 0.0;
  50 static float floor_y;   // last floor height
  51 static float user_eye_height = 165;
  52
  53 static float walk_speed = 300.0f;
  54 static float mouse_speed = 0.5f;
  55 static bool show_walk_mesh, noclip = false;
  56
  57 static bool have_headtracking, have_handtracking, should_swap;
  58
  59 static int prev_mx, prev_my;
  60 static bool bnstate[8];
  61 static bool keystate[256];
  62 static bool gpad_bnstate[64];
  63 static Vec2 joy_move, joy_look;
  64 static float joy_deadzone = 0.01;
  65
  66 static float framerate;
  67
  68 static Mat4 view_matrix, mouse_view_matrix, proj_matrix;
  69 static MetaScene *mscn;
  70 static unsigned int sdr_post_gamma;
  71
  72 static long prev_msec;
  73
  74 static ExhibitManager *exman;
  75 static bool show_blobs;
  76
  77 ExSelection exsel_active, exsel_hover;
  78 ExSelection exsel_grab_left, exsel_grab_right;
  79 #define exsel_grab_mouse exsel_grab_right
  80 static ExhibitSlot exslot_left, exslot_right;
  81 #define exslot_mouse exslot_right
  82
  83 static Renderer *rend;
  84
  85 static Ray last_pick_ray;
  86
  87
  88 bool app_init(int argc, char **argv)
  89 {
  90         set_log_file("demo.log");
  91
  92         char *env = getenv("FPEXCEPT");
  93         if(env && atoi(env)) {
  94                 info_log("enabling floating point exceptions\n");
  95                 fpexcept_enabled = 1;
  96                 enable_fpexcept();
  97         }
  98
  99         if(init_opengl() == -1) {
 100                 return false;
 101         }
 102
 103         if(!init_options(argc, argv, "demo.conf")) {
 104                 return false;
 105         }
 106         app_resize(opt.width, opt.height);
 107         app_fullscreen(opt.fullscreen);
 108
 109         if(opt.vr) {
 110                 if(goatvr_init() == -1) {
 111                         return false;
 112                 }
 113                 goatvr_set_origin_mode(GOATVR_HEAD);
 114                 goatvr_set_units_scale(100.0f);
 115
 116                 goatvr_startvr();
 117                 should_swap = goatvr_should_swap() != 0;
 118                 user_eye_height = goatvr_get_eye_height();
 119                 have_headtracking = goatvr_have_headtracking();
 120                 have_handtracking = goatvr_have_handtracking();
 121
 122                 goatvr_recenter();
 123         }
 124
 125         if(fb_srgb) {
 126                 int srgb_capable;
 127                 glGetIntegerv(GL_FRAMEBUFFER_SRGB_CAPABLE_EXT, &srgb_capable);
 128                 printf("Framebuffer %s sRGB-capable\n", srgb_capable ? "is" : "is not");
 129                 if(srgb_capable) {
 130                         glEnable(GL_FRAMEBUFFER_SRGB);
 131                 } else {
 132                         fb_srgb = 0;
 133                 }
 134         }
 135
 136         glEnable(GL_MULTISAMPLE);
 137         glEnable(GL_DEPTH_TEST);
 138         glEnable(GL_CULL_FACE);
 139         glEnable(GL_NORMALIZE);
 140
 141         if(!init_debug_gui()) {
 142                 return false;
 143         }
 144
 145         Mesh::use_custom_sdr_attr = false;
 146
 147         float ambient[] = {0.0, 0.0, 0.0, 0.0};
 148         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
 149
 150         init_audio();
 151
 152         if(!init_vrhands()) {
 153                 return false;
 154         }
 155
 156         mscn = new MetaScene;
 157         if(!mscn->load(opt.scenefile ? opt.scenefile : "data/museum.scene")) {
 158                 return false;
 159         }
 160
 161         avatar.pos = mscn->start_pos;
 162         Vec3 dir = rotate(Vec3(0, 0, 1), mscn->start_rot);
 163         dir.y = 0;
 164         avatar.body_rot = rad_to_deg(acos(dot(dir, Vec3(0, 0, 1))));
 165
 166         exman = new ExhibitManager;
 167         /*
 168         if(!exman->load(mscn, "data/exhibits")) {
 169                 //return false;
 170         }
 171         */
 172         if(!exui_init()) {
 173                 error_log("failed to initialize exhibit ui system\n");
 174                 return false;
 175         }
 176         exui_setnode(&exslot_left.node);
 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         exui_shutdown();
 225
 226         /* this must be destroyed before the scene graph to detach exhibit nodes
 227          * before the scene tries to delete them recursively
 228          */
 229         delete exman;
 230
 231         texman.clear();
 232         sceneman.clear();
 233
 234         cleanup_debug_gui();
 235 }
 236
 237 static bool constrain_walk_mesh(const Vec3 &v, Vec3 *newv)
 238 {
 239         Mesh *wm = mscn->walk_mesh;
 240         if(!wm) {
 241                 *newv = v;
 242                 return true;
 243         }
 244
 245         Ray downray = Ray(v, Vec3(0, -1, 0));
 246         HitPoint hit;
 247         if(mscn->walk_mesh->intersect(downray, &hit)) {
 248                 *newv = hit.pos;
 249                 newv->y += user_eye_height;
 250                 return true;
 251         }
 252         return false;
 253 }
 254
 255 static void update(float dt)
 256 {
 257         texman.update();
 258         sceneman.update();
 259
 260         mscn->update(dt);
 261         exman->update(dt);
 262         exui_update(dt);
 263
 264         float speed = walk_speed * dt;
 265         Vec3 dir;
 266
 267         // joystick
 268         float jdeadsq = joy_deadzone * joy_deadzone;
 269         float jmove_lensq = length_sq(joy_move);
 270         float jlook_lensq = length_sq(joy_look);
 271
 272         if(jmove_lensq > jdeadsq) {
 273                 float len = sqrt(jmove_lensq);
 274                 jmove_lensq -= jdeadsq;
 275
 276                 float mag = len * len;
 277                 dir.x += mag * joy_move.x / len * 2.0 * speed;
 278                 dir.z += mag * joy_move.y / len * 2.0 * speed;
 279         }
 280         if(jlook_lensq > jdeadsq) {
 281                 float len = sqrt(jlook_lensq);
 282                 jlook_lensq -= jdeadsq;
 283
 284                 float mag = len * len;
 285                 avatar.body_rot += mag * joy_look.x / len * 200.0 * dt;
 286                 avatar.head_alt += mag * joy_look.y / len * 100.0 * dt;
 287                 if(avatar.head_alt < -90.0f) avatar.head_alt = -90.0f;
 288                 if(avatar.head_alt > 90.0f) avatar.head_alt = 90.0f;
 289         }
 290
 291         // keyboard move
 292         if(keystate[(int)'w']) {
 293                 dir.z -= speed;
 294         }
 295         if(keystate[(int)'s']) {
 296                 dir.z += speed;
 297         }
 298         if(keystate[(int)'d']) {
 299                 dir.x += speed;
 300         }
 301         if(keystate[(int)'a']) {
 302                 dir.x -= speed;
 303         }
 304         if(keystate[(int)'q'] || gpad_bnstate[GPAD_UP]) {
 305                 avatar.pos.y += speed;
 306         }
 307         if(keystate[(int)'z'] || gpad_bnstate[GPAD_DOWN]) {
 308                 avatar.pos.y -= speed;
 309         }
 310
 311         float theta = M_PI * avatar.body_rot / 180.0f;
 312         Vec3 newpos;
 313         newpos.x = avatar.pos.x + cos(theta) * dir.x - sin(theta) * dir.z;
 314         newpos.y = avatar.pos.y;
 315         newpos.z = avatar.pos.z + sin(theta) * dir.x + cos(theta) * dir.z;
 316
 317         if(noclip) {
 318                 avatar.pos = newpos;
 319         } else {
 320                 if(!constrain_walk_mesh(newpos, &avatar.pos)) {
 321                         float dtheta = M_PI / 32.0;
 322                         float theta = dtheta;
 323                         Vec2 dir2d = newpos.xz() - avatar.pos.xz();
 324
 325                         for(int i=0; i<16; i++) {
 326                                 Vec2 dvec = rotate(dir2d, theta);
 327                                 Vec3 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 328                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 329                                         break;
 330                                 }
 331                                 dvec = rotate(dir2d, -theta);
 332                                 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 333                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 334                                         break;
 335                                 }
 336                                 theta += dtheta;
 337                         }
 338                 }
 339                 floor_y = avatar.pos.y - user_eye_height;
 340         }
 341
 342         // TODO move to the avatar system
 343         // calculate mouselook view matrix
 344         mouse_view_matrix = Mat4::identity;
 345         mouse_view_matrix.pre_translate(0, 0, -cam_dist);
 346         if(!have_headtracking) {
 347                 mouse_view_matrix.pre_rotate_x(deg_to_rad(avatar.head_alt));
 348         }
 349         mouse_view_matrix.pre_rotate_y(deg_to_rad(avatar.body_rot));
 350         mouse_view_matrix.pre_translate(-avatar.pos.x, -avatar.pos.y, -avatar.pos.z);
 351
 352         // check if an exhibit is hovered-over by mouse or 6dof (only if we don't have one grabbed)
 353         if(!exsel_grab_mouse) {
 354                 // XXX note: using previous view/proj matrix lattency shouldn't be an issue but
 355                 //           make sure state-creep doesn't get us
 356                 // XXX also this mouse-picking probably should only be active in non-VR mode
 357                 Ray ray = calc_pick_ray(prev_mx, prev_my);
 358                 exsel_hover = exman->select(ray);
 359         }
 360
 361         // update hand-tracking
 362         if(have_handtracking) {
 363                 update_vrhands(&avatar);
 364         } else {
 365                 // TODO do this properly
 366                 // set the position of the left hand at a suitable position for the exhibit UI
 367                 dir = rotate(Vec3(-0.46, -0.1, -1), Vec3(0, 1, 0), deg_to_rad(-avatar.body_rot));
 368                 exslot_left.node.set_position(avatar.pos + dir * 30); // magic: distance in front
 369         }
 370
 371         if(!exslot_right.empty()) exslot_right.node.update(dt);
 372         // always update the left slot, because it's the anchor point of the exhibit ui
 373         exslot_left.node.update(dt);
 374 }
 375
 376 void app_display()
 377 {
 378         float dt = (float)(time_msec - prev_msec) / 1000.0f;
 379         prev_msec = time_msec;
 380
 381         if(debug_gui) {
 382                 ImGui::GetIOPtr()->DeltaTime = dt;
 383                 ImGui::NewFrame();
 384
 385                 ImGui::ShowTestWindow();
 386         }
 387
 388         glClearColor(1, 1, 1, 1);
 389
 390         if(opt.vr) {
 391                 // VR mode
 392                 goatvr_draw_start();
 393                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 394
 395                 update(dt);
 396
 397                 for(int i=0; i<2; i++) {
 398                         // for each eye
 399                         goatvr_draw_eye(i);
 400
 401                         proj_matrix = goatvr_projection_matrix(i, NEAR_CLIP, FAR_CLIP);
 402                         glMatrixMode(GL_PROJECTION);
 403                         glLoadMatrixf(proj_matrix[0]);
 404
 405                         view_matrix = mouse_view_matrix * Mat4(goatvr_view_matrix(i));
 406                         glMatrixMode(GL_MODELVIEW);
 407                         glLoadMatrixf(view_matrix[0]);
 408
 409                         draw_scene();
 410                         if(have_handtracking) {
 411                                 draw_vrhands();
 412                         }
 413
 414                         if(debug_gui) {
 415                                 ImGui::Render();
 416                         }
 417                 }
 418                 goatvr_draw_done();
 419
 420                 if(should_swap) {
 421                         app_swap_buffers();
 422                 }
 423
 424         } else {
 425                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 426
 427                 update(dt);
 428
 429                 proj_matrix.perspective(deg_to_rad(50.0), win_aspect, NEAR_CLIP, FAR_CLIP);
 430                 glMatrixMode(GL_PROJECTION);
 431                 glLoadMatrixf(proj_matrix[0]);
 432
 433                 view_matrix = mouse_view_matrix;
 434                 glMatrixMode(GL_MODELVIEW);
 435                 glLoadMatrixf(view_matrix[0]);
 436
 437                 draw_scene();
 438
 439                 if(!fb_srgb && sdr_post_gamma) {
 440                         slow_post(sdr_post_gamma);
 441                         glUseProgram(0);
 442                 }
 443
 444                 if(debug_gui) {
 445                         ImGui::Render();
 446                 }
 447                 app_swap_buffers();
 448         }
 449         assert(glGetError() == GL_NO_ERROR);
 450
 451         calc_framerate();
 452 }
 453
 454
 455 static void draw_scene()
 456 {
 457         rend->draw();
 458         exman->draw();
 459
 460         /*
 461         if(have_handtracking) {
 462                 Mat4 head_xform = inverse(mouse_view_matrix);//goatvr_head_matrix();
 463                 Mat4 head_dir_xform = head_xform.upper3x3();
 464
 465                 glUseProgram(0);
 466                 glPushAttrib(GL_ENABLE_BIT);
 467                 glDisable(GL_LIGHTING);
 468                 glBegin(GL_LINES);
 469                 for(int i=0; i<2; i++) {
 470                         if(hand[i].valid) {
 471                                 glColor3f(i, 1 - i, i);
 472                         } else {
 473                                 glColor3f(0.5, 0.5, 0.5);
 474                         }
 475                         Vec3 v = head_xform * hand[i].pos;
 476                         Vec3 dir = head_dir_xform * rotate(Vec3(0, 0, -1), hand[i].rot) * 20.0f;
 477                         Vec3 up = head_dir_xform * rotate(Vec3(0, 1, 0), hand[i].rot) * 10.0f;
 478                         Vec3 right = head_dir_xform * rotate(Vec3(1, 0, 0), hand[i].rot) * 10.0f;
 479
 480                         glVertex3f(v.x, v.y, v.z);
 481                         glVertex3f(v.x + dir.x, v.y + dir.y, v.z + dir.z);
 482                         glVertex3f(v.x - right.x, v.y - right.y, v.z - right.z);
 483                         glVertex3f(v.x + right.x, v.y + right.y, v.z + right.z);
 484                         glVertex3f(v.x - up.x, v.y - up.y, v.z - up.z);
 485                         glVertex3f(v.x + up.x, v.y + up.y, v.z + up.z);
 486                 }
 487                 glEnd();
 488                 glPopAttrib();
 489         }
 490         */
 491
 492         if(debug_gui && dbg_sel_node) {
 493                 AABox bvol = dbg_sel_node->get_bounds();
 494                 draw_geom_object(&bvol);
 495         }
 496
 497         if(show_walk_mesh && mscn->walk_mesh) {
 498                 glPushAttrib(GL_ENABLE_BIT);
 499                 glEnable(GL_BLEND);
 500                 glBlendFunc(GL_ONE, GL_ONE);
 501                 glEnable(GL_POLYGON_OFFSET_FILL);
 502
 503                 glUseProgram(0);
 504
 505                 glPolygonOffset(-1, 1);
 506                 glDepthMask(0);
 507
 508                 glColor3f(0.3, 0.08, 0.01);
 509                 mscn->walk_mesh->draw();
 510
 511                 glDepthMask(1);
 512
 513                 glPopAttrib();
 514         }
 515
 516         exui_draw();
 517
 518         print_text(Vec2(9 * win_width / 10, 20), Vec3(1, 1, 0), "fps: %.1f", framerate);
 519         draw_ui();
 520 }
 521
 522
 523 void app_reshape(int x, int y)
 524 {
 525         glViewport(0, 0, x, y);
 526         goatvr_set_fb_size(x, y, 1.0f);
 527         debug_gui_reshape(x, y);
 528 }
 529
 530 void app_keyboard(int key, bool pressed)
 531 {
 532         unsigned int mod = app_get_modifiers();
 533
 534         if(debug_gui && !(pressed && (key == '`' || key == 27))) {
 535                 debug_gui_key(key, pressed, mod);
 536                 return; // ignore all keystrokes when GUI is visible
 537         }
 538
 539         if(pressed) {
 540                 switch(key) {
 541                 case 27:
 542                         app_quit();
 543                         break;
 544
 545                 case '\n':
 546                 case '\r':
 547                         if(mod & MOD_ALT) {
 548                                 app_toggle_fullscreen();
 549                         }
 550                         break;
 551
 552                 case '`':
 553                         debug_gui = !debug_gui;
 554                         show_message("debug gui %s", debug_gui ? "enabled" : "disabled");
 555                         break;
 556
 557                 case 'm':
 558                         app_toggle_grab_mouse();
 559                         show_message("mouse %s", app_is_mouse_grabbed() ? "grabbed" : "released");
 560                         break;
 561
 562                 case 'w':
 563                         if(mod & MOD_CTRL) {
 564                                 show_walk_mesh = !show_walk_mesh;
 565                                 show_message("walk mesh: %s", show_walk_mesh ? "on" : "off");
 566                         }
 567                         break;
 568
 569                 case 'c':
 570                         if(mod & MOD_CTRL) {
 571                                 noclip = !noclip;
 572                                 show_message(noclip ? "no clip" : "clip");
 573                         }
 574                         break;
 575
 576                 case 'f':
 577                         toggle_flight();
 578                         break;
 579
 580                 case 'p':
 581                         if(mod & MOD_CTRL) {
 582                                 fb_srgb = !fb_srgb;
 583                                 show_message("gamma correction for non-sRGB framebuffers: %s\n", fb_srgb ? "off" : "on");
 584                         }
 585                         break;
 586
 587                 case '=':
 588                         walk_speed *= 1.25;
 589                         show_message("walk speed: %g", walk_speed);
 590                         break;
 591
 592                 case '-':
 593                         walk_speed *= 0.75;
 594                         show_message("walk speed: %g", walk_speed);
 595                         break;
 596
 597                 case ']':
 598                         mouse_speed *= 1.2;
 599                         show_message("mouse speed: %g", mouse_speed);
 600                         break;
 601
 602                 case '[':
 603                         mouse_speed *= 0.8;
 604                         show_message("mouse speed: %g", mouse_speed);
 605                         break;
 606
 607                 case 'b':
 608                         show_blobs = !show_blobs;
 609                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 610                         break;
 611
 612                 case ' ':
 613                         goatvr_recenter();
 614                         show_message("VR recenter\n");
 615                         break;
 616
 617                 case 'x':
 618                         exman->load(mscn, "data/exhibits");
 619                         break;
 620
 621                 case KEY_UP:
 622                         exui_scroll(-1);
 623                         break;
 624
 625                 case KEY_DOWN:
 626                         exui_scroll(1);
 627                         break;
 628
 629                 case KEY_LEFT:
 630                         exui_change_tab(-1);
 631                         break;
 632
 633                 case KEY_RIGHT:
 634                         exui_change_tab(1);
 635                         break;
 636                 }
 637         }
 638
 639         if(key < 256 && !(mod & (MOD_CTRL | MOD_ALT))) {
 640                 keystate[key] = pressed;
 641         }
 642 }
 643
 644 void app_mouse_button(int bn, bool pressed, int x, int y)
 645 {
 646         static int press_x, press_y;
 647
 648         if(debug_gui) {
 649                 debug_gui_mbutton(bn, pressed, x, y);
 650                 return; // ignore mouse events while GUI is visible
 651         }
 652
 653         prev_mx = x;
 654         prev_my = y;
 655         bnstate[bn] = pressed;
 656
 657         if(bn == 0) {
 658                 ExSelection sel;
 659                 Ray ray = calc_pick_ray(x, y);
 660                 sel = exman->select(ray);
 661
 662                 if(pressed) {
 663                         if(sel && (app_get_modifiers() & MOD_CTRL)) {
 664                                 exsel_grab_mouse = sel;
 665                                 Vec3 pos = sel.ex->node->get_position();
 666                                 debug_log("grabbing... (%g %g %g)\n", pos.x, pos.y, pos.z);
 667                                 exslot_mouse.node.set_position(pos);
 668                                 exslot_mouse.node.set_rotation(sel.ex->node->get_rotation());
 669                                 exslot_mouse.attach_exhibit(sel.ex, EXSLOT_ATTACH_TRANSIENT);
 670                                 if(exsel_active) {
 671                                         exsel_active = ExSelection::null;       // cancel active on grab
 672                                 }
 673                         }
 674                         press_x = x;
 675                         press_y = y;
 676
 677                 } else {
 678                         if(exsel_grab_mouse) {
 679                                 // cancel grab on mouse release
 680                                 Exhibit *ex = exsel_grab_mouse.ex;
 681                                 Vec3 pos = exslot_mouse.node.get_position();
 682
 683                                 debug_log("releasing at %g %g %g ...\n", pos.x, pos.y, pos.z);
 684
 685                                 exslot_mouse.detach_exhibit();
 686
 687                                 ExhibitSlot *slot = exman->nearest_empty_slot(pos, 100);
 688                                 if(!slot) {
 689                                         debug_log("no empty slot nearby\n");
 690                                         if(ex->prev_slot && ex->prev_slot->empty()) {
 691                                                 slot = ex->prev_slot;
 692                                                 debug_log("using previous slot");
 693                                         }
 694                                 }
 695
 696                                 if(slot) {
 697                                         slot->attach_exhibit(ex);
 698                                 } else {
 699                                         // nowhere to put it, so stash it for later
 700                                         exslot_mouse.detach_exhibit();
 701                                         exman->stash_exhibit(ex);
 702                                         debug_log("no slots available, stashing\n");
 703                                 }
 704
 705                                 exsel_grab_mouse = ExSelection::null;
 706                         }
 707
 708                         if(abs(press_x - x) < 5 && abs(press_y - y) < 5) {
 709                                 exsel_active = sel;     // select or deselect active exhibit
 710                                 if(sel) {
 711                                         debug_log("selecting...\n");
 712                                 } else {
 713                                         debug_log("deselecting...\n");
 714                                 }
 715                         }
 716
 717                         press_x = press_y = INT_MIN;
 718                 }
 719         }
 720 }
 721
 722 static inline void mouse_look(float dx, float dy)
 723 {
 724         float scrsz = (float)win_height;
 725         avatar.body_rot += dx * 512.0 / scrsz;
 726         avatar.head_alt += dy * 512.0 / scrsz;
 727
 728         if(avatar.head_alt < -90) avatar.head_alt = -90;
 729         if(avatar.head_alt > 90) avatar.head_alt = 90;
 730 }
 731
 732 static void mouse_zoom(float dx, float dy)
 733 {
 734         cam_dist += dy * 0.1;
 735         if(cam_dist < 0.0) cam_dist = 0.0;
 736 }
 737
 738 void app_mouse_motion(int x, int y)
 739 {
 740         if(debug_gui) {
 741                 debug_gui_mmotion(x, y);
 742                 return; // ignore mouse events while GUI is visible
 743         }
 744
 745         int dx = x - prev_mx;
 746         int dy = y - prev_my;
 747         prev_mx = x;
 748         prev_my = y;
 749
 750         if(!dx && !dy) return;
 751
 752         if(exsel_grab_mouse) {
 753                 Vec3 pos = exslot_mouse.node.get_node_position();
 754                 Vec3 dir = transpose(view_matrix.upper3x3()) * Vec3(dx * 1.0, dy * -1.0, 0);
 755
 756                 exslot_mouse.node.set_position(pos + dir);
 757         }
 758
 759         if(bnstate[2]) {
 760                 mouse_look(dx, dy);
 761         }
 762 }
 763
 764 void app_mouse_delta(int dx, int dy)
 765 {
 766         if(bnstate[2]) {
 767                 mouse_zoom(dx * mouse_speed, dy * mouse_speed);
 768         } else {
 769                 mouse_look(dx * mouse_speed, dy * mouse_speed);
 770         }
 771 }
 772
 773 void app_mouse_wheel(int dir)
 774 {
 775         if(debug_gui) {
 776                 debug_gui_wheel(dir);
 777         }
 778 }
 779
 780 void app_gamepad_axis(int axis, float val)
 781 {
 782         switch(axis) {
 783         case 0:
 784                 joy_move.x = val;
 785                 break;
 786         case 1:
 787                 joy_move.y = val;
 788                 break;
 789
 790         case 2:
 791                 joy_look.x = val;
 792                 break;
 793         case 3:
 794                 joy_look.y = val;
 795                 break;
 796         }
 797 }
 798
 799 void app_gamepad_button(int bn, bool pressed)
 800 {
 801         gpad_bnstate[bn] = pressed;
 802
 803         if(pressed) {
 804                 switch(bn) {
 805                 case GPAD_LSTICK:
 806                         toggle_flight();
 807                         break;
 808
 809                 case GPAD_X:
 810                         show_blobs = !show_blobs;
 811                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 812                         break;
 813
 814                 case GPAD_START:
 815                         goatvr_recenter();
 816                         show_message("VR recenter\n");
 817                         break;
 818
 819                 default:
 820                         break;
 821                 }
 822         }
 823 }
 824
 825 static void toggle_flight()
 826 {
 827         static float prev_walk_speed = -1.0;
 828         if(prev_walk_speed < 0.0) {
 829                 noclip = true;
 830                 prev_walk_speed = walk_speed;
 831                 walk_speed = 1000.0;
 832                 show_message("fly mode\n");
 833         } else {
 834                 noclip = false;
 835                 walk_speed = prev_walk_speed;
 836                 prev_walk_speed = -1.0;
 837                 show_message("walk mode\n");
 838         }
 839 }
 840
 841 static void calc_framerate()
 842 {
 843         //static int ncalc;
 844         static int nframes;
 845         static long prev_upd;
 846
 847         long elapsed = time_msec - prev_upd;
 848         if(elapsed >= 1000) {
 849                 framerate = (float)nframes / (float)(elapsed * 0.001);
 850                 nframes = 1;
 851                 prev_upd = time_msec;
 852
 853                 /*if(++ncalc >= 5) {
 854                         printf("fps: %f\n", framerate);
 855                         ncalc = 0;
 856                 }*/
 857         } else {
 858                 ++nframes;
 859         }
 860 }
 861
 862 static Ray calc_pick_ray(int x, int y)
 863 {
 864         float nx = (float)x / (float)win_width;
 865         float ny = (float)(win_height - y) / (float)win_height;
 866
 867         last_pick_ray = mouse_pick_ray(nx, ny, view_matrix, proj_matrix);
 868         return last_pick_ray;
 869 }