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 static bool post_scene_init_pending = true;
  88
  89
  90 bool app_init(int argc, char **argv)
  91 {
  92         set_log_file("demo.log");
  93
  94         char *env = getenv("FPEXCEPT");
  95         if(env && atoi(env)) {
  96                 info_log("enabling floating point exceptions\n");
  97                 fpexcept_enabled = 1;
  98                 enable_fpexcept();
  99         }
 100
 101         if(init_opengl() == -1) {
 102                 return false;
 103         }
 104
 105         if(!init_options(argc, argv, "demo.conf")) {
 106                 return false;
 107         }
 108         app_resize(opt.width, opt.height);
 109         app_fullscreen(opt.fullscreen);
 110
 111         if(opt.vr) {
 112                 if(goatvr_init() == -1) {
 113                         return false;
 114                 }
 115                 goatvr_set_origin_mode(GOATVR_HEAD);
 116                 goatvr_set_units_scale(100.0f);
 117
 118                 goatvr_startvr();
 119                 should_swap = goatvr_should_swap() != 0;
 120                 user_eye_height = goatvr_get_eye_height();
 121                 have_headtracking = goatvr_have_headtracking();
 122                 have_handtracking = goatvr_have_handtracking();
 123
 124                 goatvr_recenter();
 125         }
 126
 127         if(fb_srgb) {
 128                 int srgb_capable;
 129                 glGetIntegerv(GL_FRAMEBUFFER_SRGB_CAPABLE_EXT, &srgb_capable);
 130                 printf("Framebuffer %s sRGB-capable\n", srgb_capable ? "is" : "is not");
 131                 if(srgb_capable) {
 132                         glEnable(GL_FRAMEBUFFER_SRGB);
 133                 } else {
 134                         fb_srgb = 0;
 135                 }
 136         }
 137
 138         glEnable(GL_MULTISAMPLE);
 139         glEnable(GL_DEPTH_TEST);
 140         glEnable(GL_CULL_FACE);
 141         glEnable(GL_NORMALIZE);
 142
 143         if(!init_debug_gui()) {
 144                 return false;
 145         }
 146
 147         Mesh::use_custom_sdr_attr = false;
 148
 149         float ambient[] = {0.0, 0.0, 0.0, 0.0};
 150         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
 151
 152         init_audio();
 153
 154         if(!init_vrhands()) {
 155                 return false;
 156         }
 157
 158         mscn = new MetaScene;
 159         if(!mscn->load(opt.scenefile ? opt.scenefile : "data/museum.scene")) {
 160                 return false;
 161         }
 162
 163         avatar.pos = mscn->start_pos;
 164         Vec3 dir = rotate(Vec3(0, 0, 1), mscn->start_rot);
 165         dir.y = 0;
 166         avatar.body_rot = rad_to_deg(acos(dot(dir, Vec3(0, 0, 1))));
 167
 168         exman = new ExhibitManager;
 169         /*
 170         if(!exman->load(mscn, "data/exhibits")) {
 171                 //return false;
 172         }
 173         */
 174         if(!exui_init()) {
 175                 error_log("failed to initialize exhibit ui system\n");
 176                 return false;
 177         }
 178         exui_setnode(&exslot_left.node);
 179
 180         if(!(sdr_ltmap_notex = create_program_load("sdr/lightmap.v.glsl", "sdr/lightmap-notex.p.glsl"))) {
 181                 return false;
 182         }
 183         set_uniform_int(sdr_ltmap_notex, "texmap", MTL_TEX_DIFFUSE);
 184         set_uniform_int(sdr_ltmap_notex, "lightmap", MTL_TEX_LIGHTMAP);
 185
 186         if(!(sdr_ltmap = create_program_load("sdr/lightmap.v.glsl", "sdr/lightmap-tex.p.glsl"))) {
 187                 return false;
 188         }
 189         set_uniform_int(sdr_ltmap, "texmap", MTL_TEX_DIFFUSE);
 190         set_uniform_int(sdr_ltmap, "lightmap", MTL_TEX_LIGHTMAP);
 191
 192         if(!fb_srgb) {
 193                 sdr_post_gamma = create_program_load("sdr/post_gamma.v.glsl", "sdr/post_gamma.p.glsl");
 194         }
 195
 196         rend = new Renderer;
 197         rend->set_scene(mscn);
 198
 199         glUseProgram(0);
 200
 201         if(opt.vr || opt.fullscreen) {
 202                 app_grab_mouse(true);
 203         }
 204
 205         if(mscn->music && opt.music) {
 206                 mscn->music->play(AUDIO_PLAYMODE_LOOP);
 207         }
 208         return true;
 209 }
 210
 211 static void post_scene_init()
 212 {
 213         int num_mir = mscn->calc_mirror_planes();
 214         info_log("found %d mirror planes\n", num_mir);
 215
 216         exman->load(mscn, "data/exhibits");
 217 }
 218
 219 void app_cleanup()
 220 {
 221         if(mscn->music) {
 222                 mscn->music->stop();
 223         }
 224         destroy_audio();
 225
 226         app_grab_mouse(false);
 227         if(opt.vr) {
 228                 goatvr_shutdown();
 229         }
 230         destroy_vrhands();
 231
 232         delete rend;
 233
 234         exui_shutdown();
 235
 236         /* this must be destroyed before the scene graph to detach exhibit nodes
 237          * before the scene tries to delete them recursively
 238          */
 239         delete exman;
 240
 241         texman.clear();
 242         sceneman.clear();
 243
 244         cleanup_debug_gui();
 245 }
 246
 247 static bool constrain_walk_mesh(const Vec3 &v, Vec3 *newv)
 248 {
 249         Mesh *wm = mscn->walk_mesh;
 250         if(!wm) {
 251                 *newv = v;
 252                 return true;
 253         }
 254
 255         Ray downray = Ray(v, Vec3(0, -1, 0));
 256         HitPoint hit;
 257         if(mscn->walk_mesh->intersect(downray, &hit)) {
 258                 *newv = hit.pos;
 259                 newv->y += user_eye_height;
 260                 return true;
 261         }
 262         return false;
 263 }
 264
 265 static void update(float dt)
 266 {
 267         texman.update();
 268         sceneman.update();
 269
 270         if(post_scene_init_pending && !sceneman.pending()) {
 271                 post_scene_init_pending = false;
 272                 post_scene_init();
 273         }
 274
 275         mscn->update(dt);
 276         exman->update(dt);
 277         exui_update(dt);
 278
 279         float speed = walk_speed * dt;
 280         Vec3 dir;
 281
 282         // joystick
 283         float jdeadsq = joy_deadzone * joy_deadzone;
 284         float jmove_lensq = length_sq(joy_move);
 285         float jlook_lensq = length_sq(joy_look);
 286
 287         if(jmove_lensq > jdeadsq) {
 288                 float len = sqrt(jmove_lensq);
 289                 jmove_lensq -= jdeadsq;
 290
 291                 float mag = len * len;
 292                 dir.x += mag * joy_move.x / len * 2.0 * speed;
 293                 dir.z += mag * joy_move.y / len * 2.0 * speed;
 294         }
 295         if(jlook_lensq > jdeadsq) {
 296                 float len = sqrt(jlook_lensq);
 297                 jlook_lensq -= jdeadsq;
 298
 299                 float mag = len * len;
 300                 avatar.body_rot += mag * joy_look.x / len * 200.0 * dt;
 301                 avatar.head_alt += mag * joy_look.y / len * 100.0 * dt;
 302                 if(avatar.head_alt < -90.0f) avatar.head_alt = -90.0f;
 303                 if(avatar.head_alt > 90.0f) avatar.head_alt = 90.0f;
 304         }
 305
 306         // keyboard move
 307         if(keystate[(int)'w']) {
 308                 dir.z -= speed;
 309         }
 310         if(keystate[(int)'s']) {
 311                 dir.z += speed;
 312         }
 313         if(keystate[(int)'d']) {
 314                 dir.x += speed;
 315         }
 316         if(keystate[(int)'a']) {
 317                 dir.x -= speed;
 318         }
 319         if(keystate[(int)'q'] || gpad_bnstate[GPAD_UP]) {
 320                 avatar.pos.y += speed;
 321         }
 322         if(keystate[(int)'z'] || gpad_bnstate[GPAD_DOWN]) {
 323                 avatar.pos.y -= speed;
 324         }
 325
 326         float theta = M_PI * avatar.body_rot / 180.0f;
 327         Vec3 newpos;
 328         newpos.x = avatar.pos.x + cos(theta) * dir.x - sin(theta) * dir.z;
 329         newpos.y = avatar.pos.y;
 330         newpos.z = avatar.pos.z + sin(theta) * dir.x + cos(theta) * dir.z;
 331
 332         if(noclip) {
 333                 avatar.pos = newpos;
 334         } else {
 335                 if(!constrain_walk_mesh(newpos, &avatar.pos)) {
 336                         float dtheta = M_PI / 32.0;
 337                         float theta = dtheta;
 338                         Vec2 dir2d = newpos.xz() - avatar.pos.xz();
 339
 340                         for(int i=0; i<16; i++) {
 341                                 Vec2 dvec = rotate(dir2d, theta);
 342                                 Vec3 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 343                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 344                                         break;
 345                                 }
 346                                 dvec = rotate(dir2d, -theta);
 347                                 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 348                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 349                                         break;
 350                                 }
 351                                 theta += dtheta;
 352                         }
 353                 }
 354                 floor_y = avatar.pos.y - user_eye_height;
 355         }
 356
 357         // TODO move to the avatar system
 358         // calculate mouselook view matrix
 359         mouse_view_matrix = Mat4::identity;
 360         mouse_view_matrix.pre_translate(0, 0, -cam_dist);
 361         if(!have_headtracking) {
 362                 mouse_view_matrix.pre_rotate_x(deg_to_rad(avatar.head_alt));
 363         }
 364         mouse_view_matrix.pre_rotate_y(deg_to_rad(avatar.body_rot));
 365         mouse_view_matrix.pre_translate(-avatar.pos.x, -avatar.pos.y, -avatar.pos.z);
 366
 367
 368         // update hand-tracking
 369         if(have_handtracking) {
 370                 update_vrhands(&avatar);
 371
 372                 if(vrhand[0].valid) {
 373                         exslot_left.node.set_position(vrhand[0].pos);
 374                         exslot_left.node.set_rotation(vrhand[0].rot);
 375
 376                         // right hand takes precedence for hover
 377                         if(!exsel_grab_left && !exsel_hover) {
 378                                 exsel_hover = exman->select(Sphere(vrhand[0].pos, 5));
 379                         }
 380                 }
 381                 if(vrhand[1].valid) {
 382                         exslot_right.node.set_position(vrhand[1].pos);
 383                         exslot_right.node.set_rotation(vrhand[1].rot);
 384
 385                         if(!exsel_grab_right) {
 386                                 exsel_hover = exman->select(Sphere(vrhand[1].pos, 5));
 387                         }
 388                 }
 389
 390         } else {
 391                 // check if an exhibit is hovered-over by mouse (only if we don't have one grabbed)
 392                 if(!exsel_grab_mouse) {
 393                         Ray ray = calc_pick_ray(prev_mx, prev_my);
 394                         exsel_hover = exman->select(ray);
 395                 }
 396
 397                 // TODO do this properly
 398                 // set the position of the left hand at a suitable position for the exhibit UI
 399                 dir = rotate(Vec3(-0.46, -0.1, -1), Vec3(0, 1, 0), deg_to_rad(-avatar.body_rot));
 400                 exslot_left.node.set_position(avatar.pos + dir * 30); // magic: distance in front
 401         }
 402
 403         if(!exslot_right.empty()) exslot_right.node.update(dt);
 404         // always update the left slot, because it's the anchor point of the exhibit ui
 405         exslot_left.node.update(dt);
 406 }
 407
 408 void app_display()
 409 {
 410         float dt = (float)(time_msec - prev_msec) / 1000.0f;
 411         prev_msec = time_msec;
 412
 413         if(debug_gui) {
 414                 ImGui::GetIOPtr()->DeltaTime = dt;
 415                 ImGui::NewFrame();
 416
 417                 ImGui::ShowTestWindow();
 418         }
 419
 420         glClearColor(1, 1, 1, 1);
 421
 422         if(opt.vr) {
 423                 // VR mode
 424                 goatvr_draw_start();
 425                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 426
 427                 update(dt);
 428
 429                 for(int i=0; i<2; i++) {
 430                         // for each eye
 431                         goatvr_draw_eye(i);
 432
 433                         proj_matrix = goatvr_projection_matrix(i, NEAR_CLIP, FAR_CLIP);
 434                         glMatrixMode(GL_PROJECTION);
 435                         glLoadMatrixf(proj_matrix[0]);
 436
 437                         view_matrix = mouse_view_matrix * Mat4(goatvr_view_matrix(i));
 438                         glMatrixMode(GL_MODELVIEW);
 439                         glLoadMatrixf(view_matrix[0]);
 440
 441                         draw_scene();
 442                         if(have_handtracking) {
 443                                 draw_vrhands();
 444                         }
 445
 446                         if(debug_gui) {
 447                                 ImGui::Render();
 448                         }
 449                 }
 450                 goatvr_draw_done();
 451
 452                 if(should_swap) {
 453                         app_swap_buffers();
 454                 }
 455
 456         } else {
 457                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 458
 459                 update(dt);
 460
 461                 proj_matrix.perspective(deg_to_rad(50.0), win_aspect, NEAR_CLIP, FAR_CLIP);
 462                 glMatrixMode(GL_PROJECTION);
 463                 glLoadMatrixf(proj_matrix[0]);
 464
 465                 view_matrix = mouse_view_matrix;
 466                 glMatrixMode(GL_MODELVIEW);
 467                 glLoadMatrixf(view_matrix[0]);
 468
 469                 draw_scene();
 470
 471                 if(!fb_srgb && sdr_post_gamma) {
 472                         slow_post(sdr_post_gamma);
 473                         glUseProgram(0);
 474                 }
 475
 476                 if(debug_gui) {
 477                         ImGui::Render();
 478                 }
 479                 app_swap_buffers();
 480         }
 481         assert(glGetError() == GL_NO_ERROR);
 482
 483         calc_framerate();
 484 }
 485
 486
 487 static void draw_scene()
 488 {
 489         rend->draw();
 490         exman->draw();
 491
 492         if(have_handtracking) {
 493                 Mat4 head_xform = inverse(mouse_view_matrix);//goatvr_head_matrix();
 494                 Mat4 head_dir_xform = head_xform.upper3x3();
 495
 496                 glUseProgram(0);
 497                 glPushAttrib(GL_ENABLE_BIT);
 498                 glDisable(GL_LIGHTING);
 499                 glBegin(GL_LINES);
 500                 for(int i=0; i<2; i++) {
 501                         if(vrhand[i].valid) {
 502                                 glColor3f(i, 1 - i, i);
 503                         } else {
 504                                 glColor3f(0.5, 0.5, 0.5);
 505                         }
 506                         Vec3 v = head_xform * vrhand[i].pos;
 507                         Vec3 dir = head_dir_xform * rotate(Vec3(0, 0, -1), vrhand[i].rot) * 20.0f;
 508                         Vec3 up = head_dir_xform * rotate(Vec3(0, 1, 0), vrhand[i].rot) * 10.0f;
 509                         Vec3 right = head_dir_xform * rotate(Vec3(1, 0, 0), vrhand[i].rot) * 10.0f;
 510
 511                         glVertex3f(v.x, v.y, v.z);
 512                         glVertex3f(v.x + dir.x, v.y + dir.y, v.z + dir.z);
 513                         glVertex3f(v.x - right.x, v.y - right.y, v.z - right.z);
 514                         glVertex3f(v.x + right.x, v.y + right.y, v.z + right.z);
 515                         glVertex3f(v.x - up.x, v.y - up.y, v.z - up.z);
 516                         glVertex3f(v.x + up.x, v.y + up.y, v.z + up.z);
 517                 }
 518                 glEnd();
 519                 glPopAttrib();
 520         }
 521
 522         if(debug_gui && dbg_sel_node) {
 523                 AABox bvol = dbg_sel_node->get_bounds();
 524                 draw_geom_object(&bvol);
 525         }
 526
 527         if(show_walk_mesh && mscn->walk_mesh) {
 528                 glPushAttrib(GL_ENABLE_BIT);
 529                 glEnable(GL_BLEND);
 530                 glBlendFunc(GL_ONE, GL_ONE);
 531                 glEnable(GL_POLYGON_OFFSET_FILL);
 532
 533                 glUseProgram(0);
 534
 535                 glPolygonOffset(-1, 1);
 536                 glDepthMask(0);
 537
 538                 glColor3f(0.3, 0.08, 0.01);
 539                 mscn->walk_mesh->draw();
 540
 541                 glDepthMask(1);
 542
 543                 glPopAttrib();
 544         }
 545
 546         exui_draw();
 547
 548         print_text(Vec2(9 * win_width / 10, 20), Vec3(1, 1, 0), "fps: %.1f", framerate);
 549         draw_ui();
 550 }
 551
 552
 553 void app_reshape(int x, int y)
 554 {
 555         glViewport(0, 0, x, y);
 556         goatvr_set_fb_size(x, y, 1.0f);
 557         debug_gui_reshape(x, y);
 558 }
 559
 560 void app_keyboard(int key, bool pressed)
 561 {
 562         unsigned int mod = app_get_modifiers();
 563
 564         if(debug_gui && !(pressed && (key == '`' || key == 27))) {
 565                 debug_gui_key(key, pressed, mod);
 566                 return; // ignore all keystrokes when GUI is visible
 567         }
 568
 569         if(pressed) {
 570                 switch(key) {
 571                 case 27:
 572                         app_quit();
 573                         break;
 574
 575                 case '\n':
 576                 case '\r':
 577                         if(mod & MOD_ALT) {
 578                                 app_toggle_fullscreen();
 579                         }
 580                         break;
 581
 582                 case '`':
 583                         debug_gui = !debug_gui;
 584                         show_message("debug gui %s", debug_gui ? "enabled" : "disabled");
 585                         break;
 586
 587                 case 'm':
 588                         app_toggle_grab_mouse();
 589                         show_message("mouse %s", app_is_mouse_grabbed() ? "grabbed" : "released");
 590                         break;
 591
 592                 case 'w':
 593                         if(mod & MOD_CTRL) {
 594                                 show_walk_mesh = !show_walk_mesh;
 595                                 show_message("walk mesh: %s", show_walk_mesh ? "on" : "off");
 596                         }
 597                         break;
 598
 599                 case 'c':
 600                         if(mod & MOD_CTRL) {
 601                                 noclip = !noclip;
 602                                 show_message(noclip ? "no clip" : "clip");
 603                         }
 604                         break;
 605
 606                 case 'f':
 607                         toggle_flight();
 608                         break;
 609
 610                 case 'p':
 611                         if(mod & MOD_CTRL) {
 612                                 fb_srgb = !fb_srgb;
 613                                 show_message("gamma correction for non-sRGB framebuffers: %s\n", fb_srgb ? "off" : "on");
 614                         }
 615                         break;
 616
 617                 case '=':
 618                         walk_speed *= 1.25;
 619                         show_message("walk speed: %g", walk_speed);
 620                         break;
 621
 622                 case '-':
 623                         walk_speed *= 0.75;
 624                         show_message("walk speed: %g", walk_speed);
 625                         break;
 626
 627                 case ']':
 628                         mouse_speed *= 1.2;
 629                         show_message("mouse speed: %g", mouse_speed);
 630                         break;
 631
 632                 case '[':
 633                         mouse_speed *= 0.8;
 634                         show_message("mouse speed: %g", mouse_speed);
 635                         break;
 636
 637                 case 'b':
 638                         show_blobs = !show_blobs;
 639                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 640                         break;
 641
 642                 case ' ':
 643                         goatvr_recenter();
 644                         show_message("VR recenter\n");
 645                         break;
 646
 647                 case KEY_UP:
 648                         exui_scroll(-1);
 649                         break;
 650
 651                 case KEY_DOWN:
 652                         exui_scroll(1);
 653                         break;
 654
 655                 case KEY_LEFT:
 656                         exui_change_tab(-1);
 657                         break;
 658
 659                 case KEY_RIGHT:
 660                         exui_change_tab(1);
 661                         break;
 662                 }
 663         }
 664
 665         if(key < 256 && !(mod & (MOD_CTRL | MOD_ALT))) {
 666                 keystate[key] = pressed;
 667         }
 668 }
 669
 670 void app_mouse_button(int bn, bool pressed, int x, int y)
 671 {
 672         static int press_x, press_y;
 673
 674         if(debug_gui) {
 675                 debug_gui_mbutton(bn, pressed, x, y);
 676                 return; // ignore mouse events while GUI is visible
 677         }
 678
 679         prev_mx = x;
 680         prev_my = y;
 681         bnstate[bn] = pressed;
 682
 683         if(bn == 0) {
 684                 ExSelection sel;
 685                 Ray ray = calc_pick_ray(x, y);
 686                 sel = exman->select(ray);
 687
 688                 if(pressed) {
 689                         if(sel && (app_get_modifiers() & MOD_CTRL)) {
 690                                 exsel_grab_mouse = sel;
 691                                 Vec3 pos = sel.ex->node->get_position();
 692                                 debug_log("grabbing... (%g %g %g)\n", pos.x, pos.y, pos.z);
 693                                 exslot_mouse.node.set_position(pos);
 694                                 exslot_mouse.node.set_rotation(sel.ex->node->get_rotation());
 695                                 exslot_mouse.attach_exhibit(sel.ex, EXSLOT_ATTACH_TRANSIENT);
 696                                 if(exsel_active) {
 697                                         exsel_active = ExSelection::null;       // cancel active on grab
 698                                 }
 699                         }
 700                         press_x = x;
 701                         press_y = y;
 702
 703                 } else {
 704                         if(exsel_grab_mouse) {
 705                                 // cancel grab on mouse release
 706                                 Exhibit *ex = exsel_grab_mouse.ex;
 707                                 Vec3 pos = exslot_mouse.node.get_position();
 708
 709                                 debug_log("releasing at %g %g %g ...\n", pos.x, pos.y, pos.z);
 710
 711                                 exslot_mouse.detach_exhibit();
 712
 713                                 ExhibitSlot *slot = exman->nearest_empty_slot(pos, 100);
 714                                 if(!slot) {
 715                                         debug_log("no empty slot nearby\n");
 716                                         if(ex->prev_slot && ex->prev_slot->empty()) {
 717                                                 slot = ex->prev_slot;
 718                                                 debug_log("using previous slot");
 719                                         }
 720                                 }
 721
 722                                 if(slot) {
 723                                         slot->attach_exhibit(ex);
 724                                 } else {
 725                                         // nowhere to put it, so stash it for later
 726                                         exslot_mouse.detach_exhibit();
 727                                         exman->stash_exhibit(ex);
 728                                         debug_log("no slots available, stashing\n");
 729                                 }
 730
 731                                 exsel_grab_mouse = ExSelection::null;
 732                         }
 733
 734                         if(abs(press_x - x) < 5 && abs(press_y - y) < 5) {
 735                                 exsel_active = sel;     // select or deselect active exhibit
 736                                 if(sel) {
 737                                         debug_log("selecting...\n");
 738                                 } else {
 739                                         debug_log("deselecting...\n");
 740                                 }
 741                         }
 742
 743                         press_x = press_y = INT_MIN;
 744                 }
 745         }
 746 }
 747
 748 static inline void mouse_look(float dx, float dy)
 749 {
 750         float scrsz = (float)win_height;
 751         avatar.body_rot += dx * 512.0 / scrsz;
 752         avatar.head_alt += dy * 512.0 / scrsz;
 753
 754         if(avatar.head_alt < -90) avatar.head_alt = -90;
 755         if(avatar.head_alt > 90) avatar.head_alt = 90;
 756 }
 757
 758 static void mouse_zoom(float dx, float dy)
 759 {
 760         cam_dist += dy * 0.1;
 761         if(cam_dist < 0.0) cam_dist = 0.0;
 762 }
 763
 764 void app_mouse_motion(int x, int y)
 765 {
 766         if(debug_gui) {
 767                 debug_gui_mmotion(x, y);
 768                 return; // ignore mouse events while GUI is visible
 769         }
 770
 771         int dx = x - prev_mx;
 772         int dy = y - prev_my;
 773         prev_mx = x;
 774         prev_my = y;
 775
 776         if(!dx && !dy) return;
 777
 778         if(exsel_grab_mouse) {
 779                 Vec3 pos = exslot_mouse.node.get_node_position();
 780                 Vec3 dir = transpose(view_matrix.upper3x3()) * Vec3(dx * 1.0, dy * -1.0, 0);
 781
 782                 exslot_mouse.node.set_position(pos + dir);
 783         }
 784
 785         if(bnstate[2]) {
 786                 mouse_look(dx, dy);
 787         }
 788 }
 789
 790 void app_mouse_delta(int dx, int dy)
 791 {
 792         if(bnstate[2]) {
 793                 mouse_zoom(dx * mouse_speed, dy * mouse_speed);
 794         } else {
 795                 mouse_look(dx * mouse_speed, dy * mouse_speed);
 796         }
 797 }
 798
 799 void app_mouse_wheel(int dir)
 800 {
 801         if(debug_gui) {
 802                 debug_gui_wheel(dir);
 803         }
 804 }
 805
 806 void app_gamepad_axis(int axis, float val)
 807 {
 808         switch(axis) {
 809         case 0:
 810                 joy_move.x = val;
 811                 break;
 812         case 1:
 813                 joy_move.y = val;
 814                 break;
 815
 816         case 2:
 817                 joy_look.x = val;
 818                 break;
 819         case 3:
 820                 joy_look.y = val;
 821                 break;
 822         }
 823 }
 824
 825 void app_gamepad_button(int bn, bool pressed)
 826 {
 827         gpad_bnstate[bn] = pressed;
 828
 829         if(pressed) {
 830                 switch(bn) {
 831                 case GPAD_LSTICK:
 832                         toggle_flight();
 833                         break;
 834
 835                 case GPAD_X:
 836                         show_blobs = !show_blobs;
 837                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 838                         break;
 839
 840                 case GPAD_START:
 841                         goatvr_recenter();
 842                         show_message("VR recenter\n");
 843                         break;
 844
 845                 default:
 846                         break;
 847                 }
 848         }
 849 }
 850
 851 static void toggle_flight()
 852 {
 853         static float prev_walk_speed = -1.0;
 854         if(prev_walk_speed < 0.0) {
 855                 noclip = true;
 856                 prev_walk_speed = walk_speed;
 857                 walk_speed = 1000.0;
 858                 show_message("fly mode\n");
 859         } else {
 860                 noclip = false;
 861                 walk_speed = prev_walk_speed;
 862                 prev_walk_speed = -1.0;
 863                 show_message("walk mode\n");
 864         }
 865 }
 866
 867 static void calc_framerate()
 868 {
 869         //static int ncalc;
 870         static int nframes;
 871         static long prev_upd;
 872
 873         long elapsed = time_msec - prev_upd;
 874         if(elapsed >= 1000) {
 875                 framerate = (float)nframes / (float)(elapsed * 0.001);
 876                 nframes = 1;
 877                 prev_upd = time_msec;
 878
 879                 /*if(++ncalc >= 5) {
 880                         printf("fps: %f\n", framerate);
 881                         ncalc = 0;
 882                 }*/
 883         } else {
 884                 ++nframes;
 885         }
 886 }
 887
 888 static Ray calc_pick_ray(int x, int y)
 889 {
 890         float nx = (float)x / (float)win_width;
 891         float ny = (float)(win_height - y) / (float)win_height;
 892
 893         last_pick_ray = mouse_pick_ray(nx, ny, view_matrix, proj_matrix);
 894         return last_pick_ray;
 895 }