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         exman->load(mscn, "data/exhibits");
 214 }
 215
 216 void app_cleanup()
 217 {
 218         if(mscn->music) {
 219                 mscn->music->stop();
 220         }
 221         destroy_audio();
 222
 223         app_grab_mouse(false);
 224         if(opt.vr) {
 225                 goatvr_shutdown();
 226         }
 227         destroy_vrhands();
 228
 229         delete rend;
 230
 231         exui_shutdown();
 232
 233         /* this must be destroyed before the scene graph to detach exhibit nodes
 234          * before the scene tries to delete them recursively
 235          */
 236         delete exman;
 237
 238         texman.clear();
 239         sceneman.clear();
 240
 241         cleanup_debug_gui();
 242 }
 243
 244 static bool constrain_walk_mesh(const Vec3 &v, Vec3 *newv)
 245 {
 246         Mesh *wm = mscn->walk_mesh;
 247         if(!wm) {
 248                 *newv = v;
 249                 return true;
 250         }
 251
 252         Ray downray = Ray(v, Vec3(0, -1, 0));
 253         HitPoint hit;
 254         if(mscn->walk_mesh->intersect(downray, &hit)) {
 255                 *newv = hit.pos;
 256                 newv->y += user_eye_height;
 257                 return true;
 258         }
 259         return false;
 260 }
 261
 262 static void update(float dt)
 263 {
 264         texman.update();
 265         sceneman.update();
 266
 267         if(post_scene_init_pending && !sceneman.pending()) {
 268                 post_scene_init_pending = false;
 269                 post_scene_init();
 270         }
 271
 272         mscn->update(dt);
 273         exman->update(dt);
 274         exui_update(dt);
 275
 276         float speed = walk_speed * dt;
 277         Vec3 dir;
 278
 279         // joystick
 280         float jdeadsq = joy_deadzone * joy_deadzone;
 281         float jmove_lensq = length_sq(joy_move);
 282         float jlook_lensq = length_sq(joy_look);
 283
 284         if(jmove_lensq > jdeadsq) {
 285                 float len = sqrt(jmove_lensq);
 286                 jmove_lensq -= jdeadsq;
 287
 288                 float mag = len * len;
 289                 dir.x += mag * joy_move.x / len * 2.0 * speed;
 290                 dir.z += mag * joy_move.y / len * 2.0 * speed;
 291         }
 292         if(jlook_lensq > jdeadsq) {
 293                 float len = sqrt(jlook_lensq);
 294                 jlook_lensq -= jdeadsq;
 295
 296                 float mag = len * len;
 297                 avatar.body_rot += mag * joy_look.x / len * 200.0 * dt;
 298                 avatar.head_alt += mag * joy_look.y / len * 100.0 * dt;
 299                 if(avatar.head_alt < -90.0f) avatar.head_alt = -90.0f;
 300                 if(avatar.head_alt > 90.0f) avatar.head_alt = 90.0f;
 301         }
 302
 303         // keyboard move
 304         if(keystate[(int)'w']) {
 305                 dir.z -= speed;
 306         }
 307         if(keystate[(int)'s']) {
 308                 dir.z += speed;
 309         }
 310         if(keystate[(int)'d']) {
 311                 dir.x += speed;
 312         }
 313         if(keystate[(int)'a']) {
 314                 dir.x -= speed;
 315         }
 316         if(keystate[(int)'q'] || gpad_bnstate[GPAD_UP]) {
 317                 avatar.pos.y += speed;
 318         }
 319         if(keystate[(int)'z'] || gpad_bnstate[GPAD_DOWN]) {
 320                 avatar.pos.y -= speed;
 321         }
 322
 323         float theta = M_PI * avatar.body_rot / 180.0f;
 324         Vec3 newpos;
 325         newpos.x = avatar.pos.x + cos(theta) * dir.x - sin(theta) * dir.z;
 326         newpos.y = avatar.pos.y;
 327         newpos.z = avatar.pos.z + sin(theta) * dir.x + cos(theta) * dir.z;
 328
 329         if(noclip) {
 330                 avatar.pos = newpos;
 331         } else {
 332                 if(!constrain_walk_mesh(newpos, &avatar.pos)) {
 333                         float dtheta = M_PI / 32.0;
 334                         float theta = dtheta;
 335                         Vec2 dir2d = newpos.xz() - avatar.pos.xz();
 336
 337                         for(int i=0; i<16; i++) {
 338                                 Vec2 dvec = rotate(dir2d, theta);
 339                                 Vec3 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 340                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 341                                         break;
 342                                 }
 343                                 dvec = rotate(dir2d, -theta);
 344                                 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 345                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 346                                         break;
 347                                 }
 348                                 theta += dtheta;
 349                         }
 350                 }
 351                 floor_y = avatar.pos.y - user_eye_height;
 352         }
 353
 354         // TODO move to the avatar system
 355         // calculate mouselook view matrix
 356         mouse_view_matrix = Mat4::identity;
 357         mouse_view_matrix.pre_translate(0, 0, -cam_dist);
 358         if(!have_headtracking) {
 359                 mouse_view_matrix.pre_rotate_x(deg_to_rad(avatar.head_alt));
 360         }
 361         mouse_view_matrix.pre_rotate_y(deg_to_rad(avatar.body_rot));
 362         mouse_view_matrix.pre_translate(-avatar.pos.x, -avatar.pos.y, -avatar.pos.z);
 363
 364
 365         // update hand-tracking
 366         if(have_handtracking) {
 367                 update_vrhands(&avatar);
 368
 369                 if(vrhand[0].valid) {
 370                         exslot_left.node.set_position(vrhand[0].pos);
 371                         exslot_left.node.set_rotation(vrhand[0].rot);
 372
 373                         // right hand takes precedence for hover
 374                         if(!exsel_grab_left && !exsel_hover) {
 375                                 exsel_hover = exman->select(Sphere(vrhand[0].pos, 5));
 376                         }
 377                 }
 378                 if(vrhand[1].valid) {
 379                         exslot_right.node.set_position(vrhand[1].pos);
 380                         exslot_right.node.set_rotation(vrhand[1].rot);
 381
 382                         if(!exsel_grab_right) {
 383                                 exsel_hover = exman->select(Sphere(vrhand[1].pos, 5));
 384                         }
 385                 }
 386
 387         } else {
 388                 // check if an exhibit is hovered-over by mouse (only if we don't have one grabbed)
 389                 if(!exsel_grab_mouse) {
 390                         Ray ray = calc_pick_ray(prev_mx, prev_my);
 391                         exsel_hover = exman->select(ray);
 392                 }
 393
 394                 // TODO do this properly
 395                 // set the position of the left hand at a suitable position for the exhibit UI
 396                 dir = rotate(Vec3(-0.46, -0.1, -1), Vec3(0, 1, 0), deg_to_rad(-avatar.body_rot));
 397                 exslot_left.node.set_position(avatar.pos + dir * 30); // magic: distance in front
 398         }
 399
 400         if(!exslot_right.empty()) exslot_right.node.update(dt);
 401         // always update the left slot, because it's the anchor point of the exhibit ui
 402         exslot_left.node.update(dt);
 403 }
 404
 405 void app_display()
 406 {
 407         float dt = (float)(time_msec - prev_msec) / 1000.0f;
 408         prev_msec = time_msec;
 409
 410         if(debug_gui) {
 411                 ImGui::GetIOPtr()->DeltaTime = dt;
 412                 ImGui::NewFrame();
 413
 414                 ImGui::ShowTestWindow();
 415         }
 416
 417         glClearColor(1, 1, 1, 1);
 418
 419         if(opt.vr) {
 420                 // VR mode
 421                 goatvr_draw_start();
 422                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 423
 424                 update(dt);
 425
 426                 for(int i=0; i<2; i++) {
 427                         // for each eye
 428                         goatvr_draw_eye(i);
 429
 430                         proj_matrix = goatvr_projection_matrix(i, NEAR_CLIP, FAR_CLIP);
 431                         glMatrixMode(GL_PROJECTION);
 432                         glLoadMatrixf(proj_matrix[0]);
 433
 434                         view_matrix = mouse_view_matrix * Mat4(goatvr_view_matrix(i));
 435                         glMatrixMode(GL_MODELVIEW);
 436                         glLoadMatrixf(view_matrix[0]);
 437
 438                         draw_scene();
 439                         if(have_handtracking) {
 440                                 draw_vrhands();
 441                         }
 442
 443                         if(debug_gui) {
 444                                 ImGui::Render();
 445                         }
 446                 }
 447                 goatvr_draw_done();
 448
 449                 if(should_swap) {
 450                         app_swap_buffers();
 451                 }
 452
 453         } else {
 454                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 455
 456                 update(dt);
 457
 458                 proj_matrix.perspective(deg_to_rad(50.0), win_aspect, NEAR_CLIP, FAR_CLIP);
 459                 glMatrixMode(GL_PROJECTION);
 460                 glLoadMatrixf(proj_matrix[0]);
 461
 462                 view_matrix = mouse_view_matrix;
 463                 glMatrixMode(GL_MODELVIEW);
 464                 glLoadMatrixf(view_matrix[0]);
 465
 466                 draw_scene();
 467
 468                 if(!fb_srgb && sdr_post_gamma) {
 469                         slow_post(sdr_post_gamma);
 470                         glUseProgram(0);
 471                 }
 472
 473                 if(debug_gui) {
 474                         ImGui::Render();
 475                 }
 476                 app_swap_buffers();
 477         }
 478         assert(glGetError() == GL_NO_ERROR);
 479
 480         calc_framerate();
 481 }
 482
 483
 484 static void draw_scene()
 485 {
 486         rend->draw();
 487         exman->draw();
 488
 489         if(have_handtracking) {
 490                 Mat4 head_xform = inverse(mouse_view_matrix);//goatvr_head_matrix();
 491                 Mat4 head_dir_xform = head_xform.upper3x3();
 492
 493                 glUseProgram(0);
 494                 glPushAttrib(GL_ENABLE_BIT);
 495                 glDisable(GL_LIGHTING);
 496                 glBegin(GL_LINES);
 497                 for(int i=0; i<2; i++) {
 498                         if(vrhand[i].valid) {
 499                                 glColor3f(i, 1 - i, i);
 500                         } else {
 501                                 glColor3f(0.5, 0.5, 0.5);
 502                         }
 503                         Vec3 v = head_xform * vrhand[i].pos;
 504                         Vec3 dir = head_dir_xform * rotate(Vec3(0, 0, -1), vrhand[i].rot) * 20.0f;
 505                         Vec3 up = head_dir_xform * rotate(Vec3(0, 1, 0), vrhand[i].rot) * 10.0f;
 506                         Vec3 right = head_dir_xform * rotate(Vec3(1, 0, 0), vrhand[i].rot) * 10.0f;
 507
 508                         glVertex3f(v.x, v.y, v.z);
 509                         glVertex3f(v.x + dir.x, v.y + dir.y, v.z + dir.z);
 510                         glVertex3f(v.x - right.x, v.y - right.y, v.z - right.z);
 511                         glVertex3f(v.x + right.x, v.y + right.y, v.z + right.z);
 512                         glVertex3f(v.x - up.x, v.y - up.y, v.z - up.z);
 513                         glVertex3f(v.x + up.x, v.y + up.y, v.z + up.z);
 514                 }
 515                 glEnd();
 516                 glPopAttrib();
 517         }
 518
 519         if(debug_gui && dbg_sel_node) {
 520                 AABox bvol = dbg_sel_node->get_bounds();
 521                 draw_geom_object(&bvol);
 522         }
 523
 524         if(show_walk_mesh && mscn->walk_mesh) {
 525                 glPushAttrib(GL_ENABLE_BIT);
 526                 glEnable(GL_BLEND);
 527                 glBlendFunc(GL_ONE, GL_ONE);
 528                 glEnable(GL_POLYGON_OFFSET_FILL);
 529
 530                 glUseProgram(0);
 531
 532                 glPolygonOffset(-1, 1);
 533                 glDepthMask(0);
 534
 535                 glColor3f(0.3, 0.08, 0.01);
 536                 mscn->walk_mesh->draw();
 537
 538                 glDepthMask(1);
 539
 540                 glPopAttrib();
 541         }
 542
 543         exui_draw();
 544
 545         print_text(Vec2(9 * win_width / 10, 20), Vec3(1, 1, 0), "fps: %.1f", framerate);
 546         draw_ui();
 547 }
 548
 549
 550 void app_reshape(int x, int y)
 551 {
 552         glViewport(0, 0, x, y);
 553         goatvr_set_fb_size(x, y, 1.0f);
 554         debug_gui_reshape(x, y);
 555 }
 556
 557 void app_keyboard(int key, bool pressed)
 558 {
 559         unsigned int mod = app_get_modifiers();
 560
 561         if(debug_gui && !(pressed && (key == '`' || key == 27))) {
 562                 debug_gui_key(key, pressed, mod);
 563                 return; // ignore all keystrokes when GUI is visible
 564         }
 565
 566         if(pressed) {
 567                 switch(key) {
 568                 case 27:
 569                         app_quit();
 570                         break;
 571
 572                 case '\n':
 573                 case '\r':
 574                         if(mod & MOD_ALT) {
 575                                 app_toggle_fullscreen();
 576                         }
 577                         break;
 578
 579                 case '`':
 580                         debug_gui = !debug_gui;
 581                         show_message("debug gui %s", debug_gui ? "enabled" : "disabled");
 582                         break;
 583
 584                 case 'm':
 585                         app_toggle_grab_mouse();
 586                         show_message("mouse %s", app_is_mouse_grabbed() ? "grabbed" : "released");
 587                         break;
 588
 589                 case 'w':
 590                         if(mod & MOD_CTRL) {
 591                                 show_walk_mesh = !show_walk_mesh;
 592                                 show_message("walk mesh: %s", show_walk_mesh ? "on" : "off");
 593                         }
 594                         break;
 595
 596                 case 'c':
 597                         if(mod & MOD_CTRL) {
 598                                 noclip = !noclip;
 599                                 show_message(noclip ? "no clip" : "clip");
 600                         }
 601                         break;
 602
 603                 case 'f':
 604                         toggle_flight();
 605                         break;
 606
 607                 case 'p':
 608                         if(mod & MOD_CTRL) {
 609                                 fb_srgb = !fb_srgb;
 610                                 show_message("gamma correction for non-sRGB framebuffers: %s\n", fb_srgb ? "off" : "on");
 611                         }
 612                         break;
 613
 614                 case '=':
 615                         walk_speed *= 1.25;
 616                         show_message("walk speed: %g", walk_speed);
 617                         break;
 618
 619                 case '-':
 620                         walk_speed *= 0.75;
 621                         show_message("walk speed: %g", walk_speed);
 622                         break;
 623
 624                 case ']':
 625                         mouse_speed *= 1.2;
 626                         show_message("mouse speed: %g", mouse_speed);
 627                         break;
 628
 629                 case '[':
 630                         mouse_speed *= 0.8;
 631                         show_message("mouse speed: %g", mouse_speed);
 632                         break;
 633
 634                 case 'b':
 635                         show_blobs = !show_blobs;
 636                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 637                         break;
 638
 639                 case ' ':
 640                         goatvr_recenter();
 641                         show_message("VR recenter\n");
 642                         break;
 643
 644                 case 'x':
 645                         exman->load(mscn, "data/exhibits");
 646                         break;
 647
 648                 case KEY_UP:
 649                         exui_scroll(-1);
 650                         break;
 651
 652                 case KEY_DOWN:
 653                         exui_scroll(1);
 654                         break;
 655
 656                 case KEY_LEFT:
 657                         exui_change_tab(-1);
 658                         break;
 659
 660                 case KEY_RIGHT:
 661                         exui_change_tab(1);
 662                         break;
 663                 }
 664         }
 665
 666         if(key < 256 && !(mod & (MOD_CTRL | MOD_ALT))) {
 667                 keystate[key] = pressed;
 668         }
 669 }
 670
 671 void app_mouse_button(int bn, bool pressed, int x, int y)
 672 {
 673         static int press_x, press_y;
 674
 675         if(debug_gui) {
 676                 debug_gui_mbutton(bn, pressed, x, y);
 677                 return; // ignore mouse events while GUI is visible
 678         }
 679
 680         prev_mx = x;
 681         prev_my = y;
 682         bnstate[bn] = pressed;
 683
 684         if(bn == 0) {
 685                 ExSelection sel;
 686                 Ray ray = calc_pick_ray(x, y);
 687                 sel = exman->select(ray);
 688
 689                 if(pressed) {
 690                         if(sel && (app_get_modifiers() & MOD_CTRL)) {
 691                                 exsel_grab_mouse = sel;
 692                                 Vec3 pos = sel.ex->node->get_position();
 693                                 debug_log("grabbing... (%g %g %g)\n", pos.x, pos.y, pos.z);
 694                                 exslot_mouse.node.set_position(pos);
 695                                 exslot_mouse.node.set_rotation(sel.ex->node->get_rotation());
 696                                 exslot_mouse.attach_exhibit(sel.ex, EXSLOT_ATTACH_TRANSIENT);
 697                                 if(exsel_active) {
 698                                         exsel_active = ExSelection::null;       // cancel active on grab
 699                                 }
 700                         }
 701                         press_x = x;
 702                         press_y = y;
 703
 704                 } else {
 705                         if(exsel_grab_mouse) {
 706                                 // cancel grab on mouse release
 707                                 Exhibit *ex = exsel_grab_mouse.ex;
 708                                 Vec3 pos = exslot_mouse.node.get_position();
 709
 710                                 debug_log("releasing at %g %g %g ...\n", pos.x, pos.y, pos.z);
 711
 712                                 exslot_mouse.detach_exhibit();
 713
 714                                 ExhibitSlot *slot = exman->nearest_empty_slot(pos, 100);
 715                                 if(!slot) {
 716                                         debug_log("no empty slot nearby\n");
 717                                         if(ex->prev_slot && ex->prev_slot->empty()) {
 718                                                 slot = ex->prev_slot;
 719                                                 debug_log("using previous slot");
 720                                         }
 721                                 }
 722
 723                                 if(slot) {
 724                                         slot->attach_exhibit(ex);
 725                                 } else {
 726                                         // nowhere to put it, so stash it for later
 727                                         exslot_mouse.detach_exhibit();
 728                                         exman->stash_exhibit(ex);
 729                                         debug_log("no slots available, stashing\n");
 730                                 }
 731
 732                                 exsel_grab_mouse = ExSelection::null;
 733                         }
 734
 735                         if(abs(press_x - x) < 5 && abs(press_y - y) < 5) {
 736                                 exsel_active = sel;     // select or deselect active exhibit
 737                                 if(sel) {
 738                                         debug_log("selecting...\n");
 739                                 } else {
 740                                         debug_log("deselecting...\n");
 741                                 }
 742                         }
 743
 744                         press_x = press_y = INT_MIN;
 745                 }
 746         }
 747 }
 748
 749 static inline void mouse_look(float dx, float dy)
 750 {
 751         float scrsz = (float)win_height;
 752         avatar.body_rot += dx * 512.0 / scrsz;
 753         avatar.head_alt += dy * 512.0 / scrsz;
 754
 755         if(avatar.head_alt < -90) avatar.head_alt = -90;
 756         if(avatar.head_alt > 90) avatar.head_alt = 90;
 757 }
 758
 759 static void mouse_zoom(float dx, float dy)
 760 {
 761         cam_dist += dy * 0.1;
 762         if(cam_dist < 0.0) cam_dist = 0.0;
 763 }
 764
 765 void app_mouse_motion(int x, int y)
 766 {
 767         if(debug_gui) {
 768                 debug_gui_mmotion(x, y);
 769                 return; // ignore mouse events while GUI is visible
 770         }
 771
 772         int dx = x - prev_mx;
 773         int dy = y - prev_my;
 774         prev_mx = x;
 775         prev_my = y;
 776
 777         if(!dx && !dy) return;
 778
 779         if(exsel_grab_mouse) {
 780                 Vec3 pos = exslot_mouse.node.get_node_position();
 781                 Vec3 dir = transpose(view_matrix.upper3x3()) * Vec3(dx * 1.0, dy * -1.0, 0);
 782
 783                 exslot_mouse.node.set_position(pos + dir);
 784         }
 785
 786         if(bnstate[2]) {
 787                 mouse_look(dx, dy);
 788         }
 789 }
 790
 791 void app_mouse_delta(int dx, int dy)
 792 {
 793         if(bnstate[2]) {
 794                 mouse_zoom(dx * mouse_speed, dy * mouse_speed);
 795         } else {
 796                 mouse_look(dx * mouse_speed, dy * mouse_speed);
 797         }
 798 }
 799
 800 void app_mouse_wheel(int dir)
 801 {
 802         if(debug_gui) {
 803                 debug_gui_wheel(dir);
 804         }
 805 }
 806
 807 void app_gamepad_axis(int axis, float val)
 808 {
 809         switch(axis) {
 810         case 0:
 811                 joy_move.x = val;
 812                 break;
 813         case 1:
 814                 joy_move.y = val;
 815                 break;
 816
 817         case 2:
 818                 joy_look.x = val;
 819                 break;
 820         case 3:
 821                 joy_look.y = val;
 822                 break;
 823         }
 824 }
 825
 826 void app_gamepad_button(int bn, bool pressed)
 827 {
 828         gpad_bnstate[bn] = pressed;
 829
 830         if(pressed) {
 831                 switch(bn) {
 832                 case GPAD_LSTICK:
 833                         toggle_flight();
 834                         break;
 835
 836                 case GPAD_X:
 837                         show_blobs = !show_blobs;
 838                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 839                         break;
 840
 841                 case GPAD_START:
 842                         goatvr_recenter();
 843                         show_message("VR recenter\n");
 844                         break;
 845
 846                 default:
 847                         break;
 848                 }
 849         }
 850 }
 851
 852 static void toggle_flight()
 853 {
 854         static float prev_walk_speed = -1.0;
 855         if(prev_walk_speed < 0.0) {
 856                 noclip = true;
 857                 prev_walk_speed = walk_speed;
 858                 walk_speed = 1000.0;
 859                 show_message("fly mode\n");
 860         } else {
 861                 noclip = false;
 862                 walk_speed = prev_walk_speed;
 863                 prev_walk_speed = -1.0;
 864                 show_message("walk mode\n");
 865         }
 866 }
 867
 868 static void calc_framerate()
 869 {
 870         //static int ncalc;
 871         static int nframes;
 872         static long prev_upd;
 873
 874         long elapsed = time_msec - prev_upd;
 875         if(elapsed >= 1000) {
 876                 framerate = (float)nframes / (float)(elapsed * 0.001);
 877                 nframes = 1;
 878                 prev_upd = time_msec;
 879
 880                 /*if(++ncalc >= 5) {
 881                         printf("fps: %f\n", framerate);
 882                         ncalc = 0;
 883                 }*/
 884         } else {
 885                 ++nframes;
 886         }
 887 }
 888
 889 static Ray calc_pick_ray(int x, int y)
 890 {
 891         float nx = (float)x / (float)win_width;
 892         float ny = (float)(win_height - y) / (float)win_height;
 893
 894         last_pick_ray = mouse_pick_ray(nx, ny, view_matrix, proj_matrix);
 895         return last_pick_ray;
 896 }