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 int vp_width, vp_height;
  37 float win_aspect;
  38 bool fb_srgb;
  39 bool opt_gear_wireframe;
  40
  41 TextureSet texman;
  42 SceneSet sceneman;
  43
  44 unsigned int sdr_ltmap, sdr_ltmap_notex;
  45
  46 int fpexcept_enabled;
  47
  48 static Avatar avatar;
  49
  50 static float cam_dist = 0.0;
  51 static float floor_y;   // last floor height
  52 static float user_eye_height = 165;
  53
  54 static float walk_speed = 300.0f;
  55 static float mouse_speed = 0.5f;
  56 static bool show_walk_mesh, noclip = false;
  57
  58 static bool have_headtracking, have_handtracking, should_swap;
  59
  60 static int prev_mx, prev_my;
  61 static bool bnstate[8];
  62 static bool keystate[256];
  63 static bool gpad_bnstate[64];
  64 static Vec2 joy_move, joy_look;
  65 static float joy_deadzone = 0.01;
  66
  67 static float framerate;
  68
  69 static Mat4 view_matrix, mouse_view_matrix, proj_matrix;
  70 static MetaScene *mscn;
  71 static unsigned int sdr_post_gamma;
  72
  73 static long prev_msec;
  74
  75 static ExhibitManager *exman;
  76 static bool show_blobs;
  77
  78 ExSelection exsel_active, exsel_hover;
  79 ExSelection exsel_grab_left, exsel_grab_right;
  80 #define exsel_grab_mouse exsel_grab_right
  81 static ExhibitSlot exslot_left, exslot_right;
  82 #define exslot_mouse exslot_right
  83
  84 static Renderer *rend;
  85
  86 static Ray last_pick_ray;
  87
  88 static bool post_scene_init_pending = true;
  89
  90
  91 bool app_init(int argc, char **argv)
  92 {
  93         set_log_file("demo.log");
  94
  95         char *env = getenv("FPEXCEPT");
  96         if(env && atoi(env)) {
  97                 info_log("enabling floating point exceptions\n");
  98                 fpexcept_enabled = 1;
  99                 enable_fpexcept();
 100         }
 101
 102         if(init_opengl() == -1) {
 103                 return false;
 104         }
 105
 106         if(!init_options(argc, argv, "demo.conf")) {
 107                 return false;
 108         }
 109         app_resize(opt.width, opt.height);
 110         app_fullscreen(opt.fullscreen);
 111
 112         if(opt.vr) {
 113                 if(goatvr_init() == -1) {
 114                         return false;
 115                 }
 116                 goatvr_set_origin_mode(GOATVR_HEAD);
 117                 goatvr_set_units_scale(100.0f);
 118
 119                 goatvr_startvr();
 120                 should_swap = goatvr_should_swap() != 0;
 121                 user_eye_height = goatvr_get_eye_height();
 122                 have_headtracking = goatvr_have_headtracking();
 123                 have_handtracking = goatvr_have_handtracking();
 124
 125                 goatvr_recenter();
 126         }
 127
 128         if(fb_srgb) {
 129                 int srgb_capable;
 130                 glGetIntegerv(GL_FRAMEBUFFER_SRGB_CAPABLE_EXT, &srgb_capable);
 131                 printf("Framebuffer %s sRGB-capable\n", srgb_capable ? "is" : "is not");
 132                 if(srgb_capable) {
 133                         glEnable(GL_FRAMEBUFFER_SRGB);
 134                 } else {
 135                         fb_srgb = 0;
 136                 }
 137         }
 138
 139         glEnable(GL_MULTISAMPLE);
 140         glEnable(GL_DEPTH_TEST);
 141         glEnable(GL_CULL_FACE);
 142         glEnable(GL_NORMALIZE);
 143
 144         if(!init_debug_gui()) {
 145                 return false;
 146         }
 147
 148         Mesh::use_custom_sdr_attr = false;
 149
 150         float ambient[] = {0.0, 0.0, 0.0, 0.0};
 151         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
 152
 153         init_audio();
 154
 155         if(!init_vrhands()) {
 156                 return false;
 157         }
 158
 159         mscn = new MetaScene;
 160         if(!mscn->load(opt.scenefile ? opt.scenefile : "data/museum.scene")) {
 161                 return false;
 162         }
 163
 164         avatar.pos = mscn->start_pos;
 165         Vec3 dir = rotate(Vec3(0, 0, 1), mscn->start_rot);
 166         dir.y = 0;
 167         avatar.body_rot = rad_to_deg(acos(dot(dir, Vec3(0, 0, 1))));
 168
 169         exman = new ExhibitManager;
 170         // exhibits are loaded in post_scene_init, because they need access to the scene graph
 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         if(!rend->init()) {
 196                 return false;
 197         }
 198         rend->set_scene(mscn);
 199
 200         glUseProgram(0);
 201
 202         if(opt.vr || opt.fullscreen) {
 203                 app_grab_mouse(true);
 204         }
 205
 206         if(mscn->music && opt.music) {
 207                 mscn->music->play(AUDIO_PLAYMODE_LOOP);
 208         }
 209         return true;
 210 }
 211
 212 // post_scene_init is called after the scene has completed loading
 213 static void post_scene_init()
 214 {
 215         mscn->update(0);        // update once to calculate node matrices
 216
 217         int num_mir = mscn->calc_mirror_planes();
 218         info_log("found %d mirror planes\n", num_mir);
 219
 220         exman->load(mscn, "data/exhibits");
 221 }
 222
 223 void app_cleanup()
 224 {
 225         if(mscn->music) {
 226                 mscn->music->stop();
 227         }
 228         destroy_audio();
 229
 230         app_grab_mouse(false);
 231         if(opt.vr) {
 232                 goatvr_shutdown();
 233         }
 234         destroy_vrhands();
 235
 236         delete rend;
 237
 238         exui_shutdown();
 239
 240         /* this must be destroyed before the scene graph to detach exhibit nodes
 241          * before the scene tries to delete them recursively
 242          */
 243         delete exman;
 244
 245         texman.clear();
 246         sceneman.clear();
 247
 248         cleanup_debug_gui();
 249 }
 250
 251 static bool constrain_walk_mesh(const Vec3 &v, Vec3 *newv)
 252 {
 253         Mesh *wm = mscn->walk_mesh;
 254         if(!wm) {
 255                 *newv = v;
 256                 return true;
 257         }
 258
 259         Ray downray = Ray(v, Vec3(0, -1, 0));
 260         HitPoint hit;
 261         if(mscn->walk_mesh->intersect(downray, &hit)) {
 262                 *newv = hit.pos;
 263                 newv->y += user_eye_height;
 264                 return true;
 265         }
 266         return false;
 267 }
 268
 269 static void update(float dt)
 270 {
 271         texman.update();
 272         sceneman.update();
 273
 274         if(post_scene_init_pending && !sceneman.pending()) {
 275                 post_scene_init_pending = false;
 276                 post_scene_init();
 277         }
 278
 279         mscn->update(dt);
 280         exman->update(dt);
 281         exui_update(dt);
 282
 283         float speed = walk_speed * dt;
 284         Vec3 dir;
 285
 286         // joystick
 287         float jdeadsq = joy_deadzone * joy_deadzone;
 288         float jmove_lensq = length_sq(joy_move);
 289         float jlook_lensq = length_sq(joy_look);
 290
 291         if(jmove_lensq > jdeadsq) {
 292                 float len = sqrt(jmove_lensq);
 293                 jmove_lensq -= jdeadsq;
 294
 295                 float mag = len * len;
 296                 dir.x += mag * joy_move.x / len * 2.0 * speed;
 297                 dir.z += mag * joy_move.y / len * 2.0 * speed;
 298         }
 299         if(jlook_lensq > jdeadsq) {
 300                 float len = sqrt(jlook_lensq);
 301                 jlook_lensq -= jdeadsq;
 302
 303                 float mag = len * len;
 304                 avatar.body_rot += mag * joy_look.x / len * 200.0 * dt;
 305                 avatar.head_alt += mag * joy_look.y / len * 100.0 * dt;
 306                 if(avatar.head_alt < -90.0f) avatar.head_alt = -90.0f;
 307                 if(avatar.head_alt > 90.0f) avatar.head_alt = 90.0f;
 308         }
 309
 310         // keyboard move
 311         if(keystate[(int)'w']) {
 312                 dir.z -= speed;
 313         }
 314         if(keystate[(int)'s']) {
 315                 dir.z += speed;
 316         }
 317         if(keystate[(int)'d']) {
 318                 dir.x += speed;
 319         }
 320         if(keystate[(int)'a']) {
 321                 dir.x -= speed;
 322         }
 323         if(keystate[(int)'q'] || gpad_bnstate[GPAD_UP]) {
 324                 avatar.pos.y += speed;
 325         }
 326         if(keystate[(int)'z'] || gpad_bnstate[GPAD_DOWN]) {
 327                 avatar.pos.y -= speed;
 328         }
 329
 330         float theta = M_PI * avatar.body_rot / 180.0f;
 331         Vec3 newpos;
 332         newpos.x = avatar.pos.x + cos(theta) * dir.x - sin(theta) * dir.z;
 333         newpos.y = avatar.pos.y;
 334         newpos.z = avatar.pos.z + sin(theta) * dir.x + cos(theta) * dir.z;
 335
 336         if(noclip) {
 337                 avatar.pos = newpos;
 338         } else {
 339                 if(!constrain_walk_mesh(newpos, &avatar.pos)) {
 340                         float dtheta = M_PI / 32.0;
 341                         float theta = dtheta;
 342                         Vec2 dir2d = newpos.xz() - avatar.pos.xz();
 343
 344                         for(int i=0; i<16; i++) {
 345                                 Vec2 dvec = rotate(dir2d, theta);
 346                                 Vec3 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 347                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 348                                         break;
 349                                 }
 350                                 dvec = rotate(dir2d, -theta);
 351                                 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 352                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 353                                         break;
 354                                 }
 355                                 theta += dtheta;
 356                         }
 357                 }
 358                 floor_y = avatar.pos.y - user_eye_height;
 359         }
 360
 361         // TODO move to the avatar system
 362         // calculate mouselook view matrix
 363         mouse_view_matrix = Mat4::identity;
 364         mouse_view_matrix.pre_translate(0, 0, -cam_dist);
 365         if(!have_headtracking) {
 366                 mouse_view_matrix.pre_rotate_x(deg_to_rad(avatar.head_alt));
 367         }
 368         mouse_view_matrix.pre_rotate_y(deg_to_rad(avatar.body_rot));
 369         mouse_view_matrix.pre_translate(-avatar.pos.x, -avatar.pos.y, -avatar.pos.z);
 370
 371
 372         // update hand-tracking
 373         if(have_handtracking) {
 374                 update_vrhands(&avatar);
 375
 376                 if(vrhand[0].valid) {
 377                         exslot_left.node.set_position(vrhand[0].pos);
 378                         exslot_left.node.set_rotation(vrhand[0].rot);
 379
 380                         // right hand takes precedence for hover
 381                         if(!exsel_grab_left && !exsel_hover) {
 382                                 exsel_hover = exman->select(Sphere(vrhand[0].pos, 5));
 383                         }
 384                 }
 385                 if(vrhand[1].valid) {
 386                         exslot_right.node.set_position(vrhand[1].pos);
 387                         exslot_right.node.set_rotation(vrhand[1].rot);
 388
 389                         if(!exsel_grab_right) {
 390                                 exsel_hover = exman->select(Sphere(vrhand[1].pos, 5));
 391                         }
 392                 }
 393
 394         } else {
 395                 // check if an exhibit is hovered-over by mouse (only if we don't have one grabbed)
 396                 if(!exsel_grab_mouse) {
 397                         Ray ray = calc_pick_ray(prev_mx, prev_my);
 398                         exsel_hover = exman->select(ray);
 399                 }
 400
 401                 // TODO do this properly
 402                 // set the position of the left hand at a suitable position for the exhibit UI
 403                 dir = rotate(Vec3(-0.46, -0.1, -1), Vec3(0, 1, 0), deg_to_rad(-avatar.body_rot));
 404                 exslot_left.node.set_position(avatar.pos + dir * 30); // magic: distance in front
 405         }
 406
 407         if(!exslot_right.empty()) exslot_right.node.update(dt);
 408         // always update the left slot, because it's the anchor point of the exhibit ui
 409         exslot_left.node.update(dt);
 410 }
 411
 412 void app_display()
 413 {
 414         float dt = (float)(time_msec - prev_msec) / 1000.0f;
 415         prev_msec = time_msec;
 416
 417         if(debug_gui) {
 418                 ImGui::GetIOPtr()->DeltaTime = dt;
 419                 ImGui::NewFrame();
 420
 421                 ImGui::ShowTestWindow();
 422         }
 423
 424         glClearColor(1, 1, 1, 1);
 425
 426         if(opt.vr) {
 427                 // VR mode
 428                 goatvr_draw_start();
 429                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 430
 431                 update(dt);
 432
 433                 for(int i=0; i<2; i++) {
 434                         // for each eye
 435                         goatvr_draw_eye(i);
 436                         vp_width = goatvr_get_fb_eye_width(i);
 437                         vp_height = goatvr_get_fb_eye_height(i);
 438
 439                         proj_matrix = goatvr_projection_matrix(i, NEAR_CLIP, FAR_CLIP);
 440                         glMatrixMode(GL_PROJECTION);
 441                         glLoadMatrixf(proj_matrix[0]);
 442
 443                         view_matrix = mouse_view_matrix * Mat4(goatvr_view_matrix(i));
 444                         glMatrixMode(GL_MODELVIEW);
 445                         glLoadMatrixf(view_matrix[0]);
 446
 447                         draw_scene();
 448                         if(have_handtracking) {
 449                                 draw_vrhands();
 450                         }
 451
 452                         if(debug_gui) {
 453                                 ImGui::Render();
 454                         }
 455                 }
 456                 goatvr_draw_done();
 457
 458                 vp_width = win_width;
 459                 vp_height = win_height;
 460
 461                 if(should_swap) {
 462                         app_swap_buffers();
 463                 }
 464
 465         } else {
 466                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 467
 468                 update(dt);
 469
 470                 proj_matrix.perspective(deg_to_rad(50.0), win_aspect, NEAR_CLIP, FAR_CLIP);
 471                 glMatrixMode(GL_PROJECTION);
 472                 glLoadMatrixf(proj_matrix[0]);
 473
 474                 view_matrix = mouse_view_matrix;
 475                 glMatrixMode(GL_MODELVIEW);
 476                 glLoadMatrixf(view_matrix[0]);
 477
 478                 draw_scene();
 479
 480                 if(!fb_srgb && sdr_post_gamma) {
 481                         slow_post(sdr_post_gamma);
 482                         glUseProgram(0);
 483                 }
 484
 485                 if(debug_gui) {
 486                         ImGui::Render();
 487                 }
 488                 app_swap_buffers();
 489         }
 490         assert(glGetError() == GL_NO_ERROR);
 491
 492         calc_framerate();
 493 }
 494
 495
 496 static void draw_scene()
 497 {
 498         rend->draw();
 499         exman->draw();
 500
 501         if(have_handtracking) {
 502                 Mat4 head_xform = inverse(mouse_view_matrix);//goatvr_head_matrix();
 503                 Mat4 head_dir_xform = head_xform.upper3x3();
 504
 505                 glUseProgram(0);
 506                 glPushAttrib(GL_ENABLE_BIT);
 507                 glDisable(GL_LIGHTING);
 508                 glBegin(GL_LINES);
 509                 for(int i=0; i<2; i++) {
 510                         if(vrhand[i].valid) {
 511                                 glColor3f(i, 1 - i, i);
 512                         } else {
 513                                 glColor3f(0.5, 0.5, 0.5);
 514                         }
 515                         Vec3 v = head_xform * vrhand[i].pos;
 516                         Vec3 dir = head_dir_xform * rotate(Vec3(0, 0, -1), vrhand[i].rot) * 20.0f;
 517                         Vec3 up = head_dir_xform * rotate(Vec3(0, 1, 0), vrhand[i].rot) * 10.0f;
 518                         Vec3 right = head_dir_xform * rotate(Vec3(1, 0, 0), vrhand[i].rot) * 10.0f;
 519
 520                         glVertex3f(v.x, v.y, v.z);
 521                         glVertex3f(v.x + dir.x, v.y + dir.y, v.z + dir.z);
 522                         glVertex3f(v.x - right.x, v.y - right.y, v.z - right.z);
 523                         glVertex3f(v.x + right.x, v.y + right.y, v.z + right.z);
 524                         glVertex3f(v.x - up.x, v.y - up.y, v.z - up.z);
 525                         glVertex3f(v.x + up.x, v.y + up.y, v.z + up.z);
 526                 }
 527                 glEnd();
 528                 glPopAttrib();
 529         }
 530
 531         if(debug_gui && dbg_sel_node) {
 532                 AABox bvol = dbg_sel_node->get_bounds();
 533                 draw_geom_object(&bvol);
 534         }
 535
 536         if(show_walk_mesh && mscn->walk_mesh) {
 537                 glPushAttrib(GL_ENABLE_BIT);
 538                 glEnable(GL_BLEND);
 539                 glBlendFunc(GL_ONE, GL_ONE);
 540                 glEnable(GL_POLYGON_OFFSET_FILL);
 541
 542                 glUseProgram(0);
 543
 544                 glPolygonOffset(-1, 1);
 545                 glDepthMask(0);
 546
 547                 glColor3f(0.3, 0.08, 0.01);
 548                 mscn->walk_mesh->draw();
 549
 550                 glDepthMask(1);
 551
 552                 glPopAttrib();
 553         }
 554
 555         exui_draw();
 556
 557         print_text(Vec2(9 * win_width / 10, 20), Vec3(1, 1, 0), "fps: %.1f", framerate);
 558         draw_ui();
 559 }
 560
 561
 562 void app_reshape(int x, int y)
 563 {
 564         glViewport(0, 0, x, y);
 565         goatvr_set_fb_size(x, y, 1.0f);
 566         debug_gui_reshape(x, y);
 567
 568         vp_width = x;
 569         vp_height = y;
 570 }
 571
 572 void app_keyboard(int key, bool pressed)
 573 {
 574         unsigned int mod = app_get_modifiers();
 575
 576         if(debug_gui && !(pressed && (key == '`' || key == 27))) {
 577                 debug_gui_key(key, pressed, mod);
 578                 return; // ignore all keystrokes when GUI is visible
 579         }
 580
 581         if(pressed) {
 582                 switch(key) {
 583                 case 27:
 584                         app_quit();
 585                         break;
 586
 587                 case '\n':
 588                 case '\r':
 589                         if(mod & MOD_ALT) {
 590                                 app_toggle_fullscreen();
 591                         }
 592                         break;
 593
 594                 case '`':
 595                         debug_gui = !debug_gui;
 596                         show_message("debug gui %s", debug_gui ? "enabled" : "disabled");
 597                         break;
 598
 599                 case 'm':
 600                         app_toggle_grab_mouse();
 601                         show_message("mouse %s", app_is_mouse_grabbed() ? "grabbed" : "released");
 602                         break;
 603
 604                 case 'w':
 605                         if(mod & MOD_CTRL) {
 606                                 show_walk_mesh = !show_walk_mesh;
 607                                 show_message("walk mesh: %s", show_walk_mesh ? "on" : "off");
 608                         }
 609                         break;
 610
 611                 case 'c':
 612                         if(mod & MOD_CTRL) {
 613                                 noclip = !noclip;
 614                                 show_message(noclip ? "no clip" : "clip");
 615                         }
 616                         break;
 617
 618                 case 'f':
 619                         toggle_flight();
 620                         break;
 621
 622                 case 'p':
 623                         if(mod & MOD_CTRL) {
 624                                 fb_srgb = !fb_srgb;
 625                                 show_message("gamma correction for non-sRGB framebuffers: %s\n", fb_srgb ? "off" : "on");
 626                         }
 627                         break;
 628
 629                 case '=':
 630                         walk_speed *= 1.25;
 631                         show_message("walk speed: %g", walk_speed);
 632                         break;
 633
 634                 case '-':
 635                         walk_speed *= 0.75;
 636                         show_message("walk speed: %g", walk_speed);
 637                         break;
 638
 639                 case ']':
 640                         mouse_speed *= 1.2;
 641                         show_message("mouse speed: %g", mouse_speed);
 642                         break;
 643
 644                 case '[':
 645                         mouse_speed *= 0.8;
 646                         show_message("mouse speed: %g", mouse_speed);
 647                         break;
 648
 649                 case 'b':
 650                         show_blobs = !show_blobs;
 651                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 652                         break;
 653
 654                 case ' ':
 655                         goatvr_recenter();
 656                         show_message("VR recenter\n");
 657                         break;
 658
 659                 case KEY_UP:
 660                         exui_scroll(-1);
 661                         break;
 662
 663                 case KEY_DOWN:
 664                         exui_scroll(1);
 665                         break;
 666
 667                 case KEY_LEFT:
 668                         exui_change_tab(-1);
 669                         break;
 670
 671                 case KEY_RIGHT:
 672                         exui_change_tab(1);
 673                         break;
 674                 }
 675         }
 676
 677         if(key < 256 && !(mod & (MOD_CTRL | MOD_ALT))) {
 678                 keystate[key] = pressed;
 679         }
 680 }
 681
 682 void app_mouse_button(int bn, bool pressed, int x, int y)
 683 {
 684         static int press_x, press_y;
 685
 686         if(debug_gui) {
 687                 debug_gui_mbutton(bn, pressed, x, y);
 688                 return; // ignore mouse events while GUI is visible
 689         }
 690
 691         prev_mx = x;
 692         prev_my = y;
 693         bnstate[bn] = pressed;
 694
 695         if(bn == 0) {
 696                 ExSelection sel;
 697                 Ray ray = calc_pick_ray(x, y);
 698                 sel = exman->select(ray);
 699
 700                 if(pressed) {
 701                         if(sel && (app_get_modifiers() & MOD_CTRL)) {
 702                                 exsel_grab_mouse = sel;
 703                                 Vec3 pos = sel.ex->node->get_position();
 704                                 debug_log("grabbing... (%g %g %g)\n", pos.x, pos.y, pos.z);
 705                                 exslot_mouse.node.set_position(pos);
 706                                 exslot_mouse.node.set_rotation(sel.ex->node->get_rotation());
 707                                 exslot_mouse.attach_exhibit(sel.ex, EXSLOT_ATTACH_TRANSIENT);
 708                                 if(exsel_active) {
 709                                         exsel_active = ExSelection::null;       // cancel active on grab
 710                                 }
 711                         }
 712                         press_x = x;
 713                         press_y = y;
 714
 715                 } else {
 716                         if(exsel_grab_mouse) {
 717                                 // cancel grab on mouse release
 718                                 Exhibit *ex = exsel_grab_mouse.ex;
 719                                 Vec3 pos = exslot_mouse.node.get_position();
 720
 721                                 debug_log("releasing at %g %g %g ...\n", pos.x, pos.y, pos.z);
 722
 723                                 exslot_mouse.detach_exhibit();
 724
 725                                 ExhibitSlot *slot = exman->nearest_empty_slot(pos, 100);
 726                                 if(!slot) {
 727                                         debug_log("no empty slot nearby\n");
 728                                         if(ex->prev_slot && ex->prev_slot->empty()) {
 729                                                 slot = ex->prev_slot;
 730                                                 debug_log("using previous slot");
 731                                         }
 732                                 }
 733
 734                                 if(slot) {
 735                                         slot->attach_exhibit(ex);
 736                                 } else {
 737                                         // nowhere to put it, so stash it for later
 738                                         exslot_mouse.detach_exhibit();
 739                                         exman->stash_exhibit(ex);
 740                                         debug_log("no slots available, stashing\n");
 741                                 }
 742
 743                                 exsel_grab_mouse = ExSelection::null;
 744                         }
 745
 746                         if(abs(press_x - x) < 5 && abs(press_y - y) < 5) {
 747                                 exsel_active = sel;     // select or deselect active exhibit
 748                                 if(sel) {
 749                                         debug_log("selecting...\n");
 750                                 } else {
 751                                         debug_log("deselecting...\n");
 752                                 }
 753                         }
 754
 755                         press_x = press_y = INT_MIN;
 756                 }
 757         }
 758 }
 759
 760 static inline void mouse_look(float dx, float dy)
 761 {
 762         float scrsz = (float)win_height;
 763         avatar.body_rot += dx * 512.0 / scrsz;
 764         avatar.head_alt += dy * 512.0 / scrsz;
 765
 766         if(avatar.head_alt < -90) avatar.head_alt = -90;
 767         if(avatar.head_alt > 90) avatar.head_alt = 90;
 768 }
 769
 770 static void mouse_zoom(float dx, float dy)
 771 {
 772         cam_dist += dy * 0.1;
 773         if(cam_dist < 0.0) cam_dist = 0.0;
 774 }
 775
 776 void app_mouse_motion(int x, int y)
 777 {
 778         if(debug_gui) {
 779                 debug_gui_mmotion(x, y);
 780                 return; // ignore mouse events while GUI is visible
 781         }
 782
 783         int dx = x - prev_mx;
 784         int dy = y - prev_my;
 785         prev_mx = x;
 786         prev_my = y;
 787
 788         if(!dx && !dy) return;
 789
 790         if(exsel_grab_mouse) {
 791                 Vec3 pos = exslot_mouse.node.get_node_position();
 792                 Vec3 dir = transpose(view_matrix.upper3x3()) * Vec3(dx * 1.0, dy * -1.0, 0);
 793
 794                 exslot_mouse.node.set_position(pos + dir);
 795         }
 796
 797         if(bnstate[2]) {
 798                 mouse_look(dx, dy);
 799         }
 800 }
 801
 802 void app_mouse_delta(int dx, int dy)
 803 {
 804         if(bnstate[2]) {
 805                 mouse_zoom(dx * mouse_speed, dy * mouse_speed);
 806         } else {
 807                 mouse_look(dx * mouse_speed, dy * mouse_speed);
 808         }
 809 }
 810
 811 void app_mouse_wheel(int dir)
 812 {
 813         if(debug_gui) {
 814                 debug_gui_wheel(dir);
 815         }
 816 }
 817
 818 void app_gamepad_axis(int axis, float val)
 819 {
 820         switch(axis) {
 821         case 0:
 822                 joy_move.x = val;
 823                 break;
 824         case 1:
 825                 joy_move.y = val;
 826                 break;
 827
 828         case 2:
 829                 joy_look.x = val;
 830                 break;
 831         case 3:
 832                 joy_look.y = val;
 833                 break;
 834         }
 835 }
 836
 837 void app_gamepad_button(int bn, bool pressed)
 838 {
 839         gpad_bnstate[bn] = pressed;
 840
 841         if(pressed) {
 842                 switch(bn) {
 843                 case GPAD_LSTICK:
 844                         toggle_flight();
 845                         break;
 846
 847                 case GPAD_X:
 848                         show_blobs = !show_blobs;
 849                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 850                         break;
 851
 852                 case GPAD_START:
 853                         goatvr_recenter();
 854                         show_message("VR recenter\n");
 855                         break;
 856
 857                 default:
 858                         break;
 859                 }
 860         }
 861 }
 862
 863 static void toggle_flight()
 864 {
 865         static float prev_walk_speed = -1.0;
 866         if(prev_walk_speed < 0.0) {
 867                 noclip = true;
 868                 prev_walk_speed = walk_speed;
 869                 walk_speed = 1000.0;
 870                 show_message("fly mode\n");
 871         } else {
 872                 noclip = false;
 873                 walk_speed = prev_walk_speed;
 874                 prev_walk_speed = -1.0;
 875                 show_message("walk mode\n");
 876         }
 877 }
 878
 879 static void calc_framerate()
 880 {
 881         //static int ncalc;
 882         static int nframes;
 883         static long prev_upd;
 884
 885         long elapsed = time_msec - prev_upd;
 886         if(elapsed >= 1000) {
 887                 framerate = (float)nframes / (float)(elapsed * 0.001);
 888                 nframes = 1;
 889                 prev_upd = time_msec;
 890
 891                 /*if(++ncalc >= 5) {
 892                         printf("fps: %f\n", framerate);
 893                         ncalc = 0;
 894                 }*/
 895         } else {
 896                 ++nframes;
 897         }
 898 }
 899
 900 static Ray calc_pick_ray(int x, int y)
 901 {
 902         float nx = (float)x / (float)win_width;
 903         float ny = (float)(win_height - y) / (float)win_height;
 904
 905         last_pick_ray = mouse_pick_ray(nx, ny, view_matrix, proj_matrix);
 906         return last_pick_ray;
 907 }