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 "rtarg.h"
  19 #include "avatar.h"
  20 #include "vrinput.h"
  21 #include "exman.h"
  22 #include "blob_exhibit.h"
  23 #include "dbg_gui.h"
  24 #include "geomdraw.h"
  25 #include "ui_exhibit.h"
  26
  27 #define NEAR_CLIP       5.0
  28 #define FAR_CLIP        10000.0
  29
  30 static void draw_scene();
  31 static void toggle_flight();
  32 static void calc_framerate();
  33 static Ray calc_pick_ray(int x, int y);
  34
  35 long time_msec;
  36 int win_width, win_height;
  37 int vp_width, vp_height;
  38 float win_aspect;
  39 bool fb_srgb;
  40 bool opt_gear_wireframe;
  41
  42 TextureSet texman;
  43 SceneSet sceneman;
  44
  45 int fpexcept_enabled;
  46
  47 unsigned int dbg_key_pending;
  48
  49 static Avatar avatar;
  50
  51 static float cam_dist = 0.0;
  52 static float floor_y;   // last floor height
  53 static float user_eye_height = 165;
  54
  55 static float walk_speed = 300.0f;
  56 static float mouse_speed = 0.5f;
  57 static bool show_walk_mesh, noclip = false;
  58
  59 static bool have_headtracking, have_handtracking, should_swap;
  60
  61 static int prev_mx, prev_my;
  62 static bool bnstate[8];
  63 static bool keystate[256];
  64 static bool gpad_bnstate[64];
  65 static Vec2 joy_move, joy_look;
  66 static float joy_deadzone = 0.01;
  67
  68 static float framerate;
  69
  70 static Mat4 view_matrix, mouse_view_matrix, proj_matrix;
  71 static MetaScene *mscn;
  72 static unsigned int sdr_post_gamma;
  73
  74 static long prev_msec;
  75
  76 static ExhibitManager *exman;
  77 static bool show_blobs;
  78
  79 ExSelection exsel_active, exsel_hover;
  80 ExSelection exsel_grab_left, exsel_grab_right;
  81 #define exsel_grab_mouse exsel_grab_right
  82 static ExhibitSlot exslot_left, exslot_right;
  83 #define exslot_mouse exslot_right
  84
  85 static Renderer *rend;
  86 static RenderTarget *goatvr_rtarg;
  87
  88 static Ray last_pick_ray;
  89
  90 static bool post_scene_init_pending = true;
  91
  92
  93 bool app_init(int argc, char **argv)
  94 {
  95         set_log_file("demo.log");
  96
  97         char *env = getenv("FPEXCEPT");
  98         if(env && atoi(env)) {
  99                 info_log("enabling floating point exceptions\n");
 100                 fpexcept_enabled = 1;
 101                 enable_fpexcept();
 102         }
 103
 104         if(init_opengl() == -1) {
 105                 return false;
 106         }
 107
 108         if(!init_options(argc, argv, "demo.conf")) {
 109                 return false;
 110         }
 111         app_resize(opt.width, opt.height);
 112         app_fullscreen(opt.fullscreen);
 113
 114         if(opt.vr) {
 115                 if(goatvr_init() == -1) {
 116                         return false;
 117                 }
 118                 goatvr_set_origin_mode(GOATVR_HEAD);
 119                 goatvr_set_units_scale(100.0f);
 120
 121                 goatvr_startvr();
 122                 should_swap = goatvr_should_swap() != 0;
 123                 user_eye_height = goatvr_get_eye_height();
 124                 have_headtracking = goatvr_have_headtracking();
 125                 have_handtracking = goatvr_have_handtracking();
 126
 127                 goatvr_recenter();
 128
 129                 goatvr_rtarg = new RenderTarget;
 130         }
 131
 132         if(fb_srgb) {
 133                 int srgb_capable;
 134                 glGetIntegerv(GL_FRAMEBUFFER_SRGB_CAPABLE_EXT, &srgb_capable);
 135                 printf("Framebuffer %s sRGB-capable\n", srgb_capable ? "is" : "is not");
 136                 if(srgb_capable) {
 137                         glEnable(GL_FRAMEBUFFER_SRGB);
 138                 } else {
 139                         fb_srgb = 0;
 140                 }
 141         }
 142
 143         glEnable(GL_MULTISAMPLE);
 144         glEnable(GL_DEPTH_TEST);
 145         glEnable(GL_CULL_FACE);
 146         glEnable(GL_NORMALIZE);
 147
 148         if(!init_debug_gui()) {
 149                 return false;
 150         }
 151
 152         Mesh::use_custom_sdr_attr = false;
 153
 154         float ambient[] = {0.0, 0.0, 0.0, 0.0};
 155         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
 156
 157         init_audio();
 158
 159         if(!init_vrhands()) {
 160                 return false;
 161         }
 162
 163         mscn = new MetaScene;
 164         if(!mscn->load(opt.scenefile ? opt.scenefile : "data/museum.scene")) {
 165                 return false;
 166         }
 167
 168         avatar.pos = mscn->start_pos;
 169         Vec3 dir = rotate(Vec3(0, 0, 1), mscn->start_rot);
 170         dir.y = 0;
 171         avatar.body_rot = rad_to_deg(acos(dot(dir, Vec3(0, 0, 1))));
 172
 173         exman = new ExhibitManager;
 174         // exhibits are loaded in post_scene_init, because they need access to the scene graph
 175
 176         if(!exui_init()) {
 177                 error_log("failed to initialize exhibit ui system\n");
 178                 return false;
 179         }
 180         exui_setnode(&exslot_left.node);
 181
 182         if(!fb_srgb) {
 183                 sdr_post_gamma = create_program_load("sdr/post_gamma.v.glsl", "sdr/post_gamma.p.glsl");
 184         }
 185
 186         rend = new Renderer;
 187         if(!rend->init()) {
 188                 return false;
 189         }
 190         if(opt.reflect) {
 191                 rend->ropt |= RENDER_MIRRORS;
 192         } else {
 193                 rend->ropt &= ~RENDER_MIRRORS;
 194         }
 195         rend->set_scene(mscn);
 196
 197         glUseProgram(0);
 198
 199         if(opt.vr || opt.fullscreen) {
 200                 app_grab_mouse(true);
 201         }
 202
 203         if(mscn->music && opt.music) {
 204                 mscn->music->play(AUDIO_PLAYMODE_LOOP);
 205         }
 206         return true;
 207 }
 208
 209 // post_scene_init is called after the scene has completed loading
 210 static void post_scene_init()
 211 {
 212         mscn->update(0);        // update once to calculate node matrices
 213
 214         int num_mir = mscn->calc_mirror_planes();
 215         info_log("found %d mirror planes\n", num_mir);
 216
 217         exman->load(mscn, "data/exhibits");
 218 }
 219
 220 void app_cleanup()
 221 {
 222         if(mscn->music) {
 223                 mscn->music->stop();
 224         }
 225         destroy_audio();
 226
 227         app_grab_mouse(false);
 228         if(opt.vr) {
 229                 delete goatvr_rtarg;
 230                 goatvr_shutdown();
 231         }
 232         destroy_vrhands();
 233
 234         delete rend;
 235
 236         exui_shutdown();
 237
 238         /* this must be destroyed before the scene graph to detach exhibit nodes
 239          * before the scene tries to delete them recursively
 240          */
 241         delete exman;
 242
 243         texman.clear();
 244         sceneman.clear();
 245
 246         cleanup_debug_gui();
 247 }
 248
 249 static bool constrain_walk_mesh(const Vec3 &v, Vec3 *newv)
 250 {
 251         Mesh *wm = mscn->walk_mesh;
 252         if(!wm) {
 253                 *newv = v;
 254                 return true;
 255         }
 256
 257         Ray downray = Ray(v, Vec3(0, -1, 0));
 258         HitPoint hit;
 259         if(mscn->walk_mesh->intersect(downray, &hit)) {
 260                 *newv = hit.pos;
 261                 newv->y += user_eye_height;
 262                 return true;
 263         }
 264         return false;
 265 }
 266
 267 static void update(float dt)
 268 {
 269         texman.update();
 270         sceneman.update();
 271
 272         if(post_scene_init_pending && !sceneman.pending()) {
 273                 post_scene_init_pending = false;
 274                 post_scene_init();
 275         }
 276
 277         mscn->update(dt);
 278         exman->update(dt);
 279         exui_update(dt);
 280
 281         float speed = walk_speed * dt;
 282         Vec3 dir;
 283
 284         // joystick
 285         float jdeadsq = joy_deadzone * joy_deadzone;
 286         float jmove_lensq = length_sq(joy_move);
 287         float jlook_lensq = length_sq(joy_look);
 288
 289         if(jmove_lensq > jdeadsq) {
 290                 float len = sqrt(jmove_lensq);
 291                 jmove_lensq -= jdeadsq;
 292
 293                 float mag = len * len;
 294                 dir.x += mag * joy_move.x / len * 2.0 * speed;
 295                 dir.z += mag * joy_move.y / len * 2.0 * speed;
 296         }
 297         if(jlook_lensq > jdeadsq) {
 298                 float len = sqrt(jlook_lensq);
 299                 jlook_lensq -= jdeadsq;
 300
 301                 float mag = len * len;
 302                 avatar.body_rot += mag * joy_look.x / len * 200.0 * dt;
 303                 avatar.head_alt += mag * joy_look.y / len * 100.0 * dt;
 304                 if(avatar.head_alt < -90.0f) avatar.head_alt = -90.0f;
 305                 if(avatar.head_alt > 90.0f) avatar.head_alt = 90.0f;
 306         }
 307
 308         // keyboard move
 309         if(keystate[(int)'w']) {
 310                 dir.z -= speed;
 311         }
 312         if(keystate[(int)'s']) {
 313                 dir.z += speed;
 314         }
 315         if(keystate[(int)'d']) {
 316                 dir.x += speed;
 317         }
 318         if(keystate[(int)'a']) {
 319                 dir.x -= speed;
 320         }
 321         if(keystate[(int)'q'] || gpad_bnstate[GPAD_UP]) {
 322                 avatar.pos.y += speed;
 323         }
 324         if(keystate[(int)'z'] || gpad_bnstate[GPAD_DOWN]) {
 325                 avatar.pos.y -= speed;
 326         }
 327
 328         float theta = M_PI * avatar.body_rot / 180.0f;
 329         Vec3 newpos;
 330         newpos.x = avatar.pos.x + cos(theta) * dir.x - sin(theta) * dir.z;
 331         newpos.y = avatar.pos.y;
 332         newpos.z = avatar.pos.z + sin(theta) * dir.x + cos(theta) * dir.z;
 333
 334         if(noclip) {
 335                 avatar.pos = newpos;
 336         } else {
 337                 if(!constrain_walk_mesh(newpos, &avatar.pos)) {
 338                         float dtheta = M_PI / 32.0;
 339                         float theta = dtheta;
 340                         Vec2 dir2d = newpos.xz() - avatar.pos.xz();
 341
 342                         for(int i=0; i<16; i++) {
 343                                 Vec2 dvec = rotate(dir2d, theta);
 344                                 Vec3 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 345                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 346                                         break;
 347                                 }
 348                                 dvec = rotate(dir2d, -theta);
 349                                 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 350                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 351                                         break;
 352                                 }
 353                                 theta += dtheta;
 354                         }
 355                 }
 356                 floor_y = avatar.pos.y - user_eye_height;
 357         }
 358
 359         // TODO move to the avatar system
 360         // calculate mouselook view matrix
 361         mouse_view_matrix = Mat4::identity;
 362         mouse_view_matrix.pre_translate(0, 0, -cam_dist);
 363         if(!have_headtracking) {
 364                 mouse_view_matrix.pre_rotate_x(deg_to_rad(avatar.head_alt));
 365         }
 366         mouse_view_matrix.pre_rotate_y(deg_to_rad(avatar.body_rot));
 367         mouse_view_matrix.pre_translate(-avatar.pos.x, -avatar.pos.y, -avatar.pos.z);
 368
 369
 370         // update hand-tracking
 371         if(have_handtracking) {
 372                 update_vrhands(&avatar);
 373
 374                 if(vrhand[0].valid) {
 375                         exslot_left.node.set_position(vrhand[0].pos);
 376                         exslot_left.node.set_rotation(vrhand[0].rot);
 377
 378                         // right hand takes precedence for hover
 379                         if(!exsel_grab_left && !exsel_hover) {
 380                                 exsel_hover = exman->select(Sphere(vrhand[0].pos, 5));
 381                         }
 382                 }
 383                 if(vrhand[1].valid) {
 384                         exslot_right.node.set_position(vrhand[1].pos);
 385                         exslot_right.node.set_rotation(vrhand[1].rot);
 386
 387                         if(!exsel_grab_right) {
 388                                 exsel_hover = exman->select(Sphere(vrhand[1].pos, 5));
 389                         }
 390                 }
 391
 392         } else {
 393                 // check if an exhibit is hovered-over by mouse (only if we don't have one grabbed)
 394                 if(!exsel_grab_mouse) {
 395                         Ray ray = calc_pick_ray(prev_mx, prev_my);
 396                         exsel_hover = exman->select(ray);
 397                 }
 398
 399                 // TODO do this properly
 400                 // set the position of the left hand at a suitable position for the exhibit UI
 401                 dir = rotate(Vec3(-0.46, -0.1, -1), Vec3(0, 1, 0), deg_to_rad(-avatar.body_rot));
 402                 exslot_left.node.set_position(avatar.pos + dir * 30); // magic: distance in front
 403         }
 404
 405         if(!exslot_right.empty()) exslot_right.node.update(dt);
 406         // always update the left slot, because it's the anchor point of the exhibit ui
 407         exslot_left.node.update(dt);
 408 }
 409
 410 void app_display()
 411 {
 412         float dt = (float)(time_msec - prev_msec) / 1000.0f;
 413         prev_msec = time_msec;
 414
 415         if(debug_gui) {
 416                 ImGui::GetIOPtr()->DeltaTime = dt;
 417                 ImGui::NewFrame();
 418
 419                 //ImGui::ShowTestWindow();
 420         }
 421
 422         glClearColor(1, 1, 1, 1);
 423
 424         if(opt.vr) {
 425                 // VR mode
 426                 goatvr_draw_start();
 427                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 428
 429                 unsigned int gfbo = goatvr_get_fbo();
 430
 431                 update(dt);
 432
 433                 for(int i=0; i<2; i++) {
 434                         // for each eye
 435                         goatvr_draw_eye(i);
 436                         if(gfbo) {
 437                                 vp_width = goatvr_get_fb_eye_width(i);
 438                                 vp_height = goatvr_get_fb_eye_height(i);
 439
 440                                 // this is a lightweight operation
 441                                 goatvr_rtarg->create_wrap_fbo(gfbo, vp_width, vp_height);
 442                                 push_render_target(goatvr_rtarg, RT_FAKE);
 443                         } else {
 444                                 vp_width = win_width / 2;
 445                         }
 446
 447                         proj_matrix = goatvr_projection_matrix(i, NEAR_CLIP, FAR_CLIP);
 448                         glMatrixMode(GL_PROJECTION);
 449                         glLoadMatrixf(proj_matrix[0]);
 450
 451                         view_matrix = mouse_view_matrix * Mat4(goatvr_view_matrix(i));
 452                         glMatrixMode(GL_MODELVIEW);
 453                         glLoadMatrixf(view_matrix[0]);
 454
 455                         draw_scene();
 456                         if(have_handtracking) {
 457                                 draw_vrhands();
 458                         }
 459
 460                         if(debug_gui) {
 461                                 ImGui::Render();
 462                         }
 463
 464                         if(gfbo) {
 465                                 pop_render_target(RT_FAKE);
 466                         }
 467                 }
 468
 469                 goatvr_draw_done();
 470
 471                 vp_width = win_width;
 472                 vp_height = win_height;
 473
 474                 if(should_swap) {
 475                         app_swap_buffers();
 476                 }
 477
 478         } else {
 479                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 480
 481                 update(dt);
 482
 483                 proj_matrix.perspective(deg_to_rad(50.0), win_aspect, NEAR_CLIP, FAR_CLIP);
 484                 glMatrixMode(GL_PROJECTION);
 485                 glLoadMatrixf(proj_matrix[0]);
 486
 487                 view_matrix = mouse_view_matrix;
 488                 glMatrixMode(GL_MODELVIEW);
 489                 glLoadMatrixf(view_matrix[0]);
 490
 491                 draw_scene();
 492
 493                 if(!fb_srgb && sdr_post_gamma) {
 494                         slow_post(sdr_post_gamma);
 495                         glUseProgram(0);
 496                 }
 497
 498                 if(debug_gui) {
 499                         ImGui::Render();
 500                 }
 501                 app_swap_buffers();
 502         }
 503         assert(glGetError() == GL_NO_ERROR);
 504
 505         calc_framerate();
 506 }
 507
 508
 509 static void draw_scene()
 510 {
 511         rend->draw();
 512         exman->draw();
 513
 514         if(have_handtracking) {
 515                 Mat4 head_xform = inverse(mouse_view_matrix);//goatvr_head_matrix();
 516                 Mat4 head_dir_xform = head_xform.upper3x3();
 517
 518                 glUseProgram(0);
 519                 glPushAttrib(GL_ENABLE_BIT);
 520                 glDisable(GL_LIGHTING);
 521                 glBegin(GL_LINES);
 522                 for(int i=0; i<2; i++) {
 523                         if(vrhand[i].valid) {
 524                                 glColor3f(i, 1 - i, i);
 525                         } else {
 526                                 glColor3f(0.5, 0.5, 0.5);
 527                         }
 528                         Vec3 v = head_xform * vrhand[i].pos;
 529                         Vec3 dir = head_dir_xform * rotate(Vec3(0, 0, -1), vrhand[i].rot) * 20.0f;
 530                         Vec3 up = head_dir_xform * rotate(Vec3(0, 1, 0), vrhand[i].rot) * 10.0f;
 531                         Vec3 right = head_dir_xform * rotate(Vec3(1, 0, 0), vrhand[i].rot) * 10.0f;
 532
 533                         glVertex3f(v.x, v.y, v.z);
 534                         glVertex3f(v.x + dir.x, v.y + dir.y, v.z + dir.z);
 535                         glVertex3f(v.x - right.x, v.y - right.y, v.z - right.z);
 536                         glVertex3f(v.x + right.x, v.y + right.y, v.z + right.z);
 537                         glVertex3f(v.x - up.x, v.y - up.y, v.z - up.z);
 538                         glVertex3f(v.x + up.x, v.y + up.y, v.z + up.z);
 539                 }
 540                 glEnd();
 541                 glPopAttrib();
 542         }
 543
 544         if(debug_gui && dbg_sel_node) {
 545                 AABox bvol = dbg_sel_node->get_bounds();
 546                 draw_geom_object(&bvol);
 547         }
 548
 549         if(show_walk_mesh && mscn->walk_mesh) {
 550                 glPushAttrib(GL_ENABLE_BIT);
 551                 glEnable(GL_BLEND);
 552                 glBlendFunc(GL_ONE, GL_ONE);
 553                 glEnable(GL_POLYGON_OFFSET_FILL);
 554
 555                 glUseProgram(0);
 556
 557                 glPolygonOffset(-1, 1);
 558                 glDepthMask(0);
 559
 560                 glColor3f(0.3, 0.08, 0.01);
 561                 mscn->walk_mesh->draw();
 562
 563                 glDepthMask(1);
 564
 565                 glPopAttrib();
 566         }
 567
 568         exui_draw();
 569
 570         print_text(Vec2(9 * win_width / 10, 20), Vec3(1, 1, 0), "fps: %.1f", framerate);
 571         draw_ui();
 572 }
 573
 574
 575 void app_reshape(int x, int y)
 576 {
 577         glViewport(0, 0, x, y);
 578         goatvr_set_fb_size(x, y, 1.0f);
 579         debug_gui_reshape(x, y);
 580
 581         vp_width = x;
 582         vp_height = y;
 583 }
 584
 585 void app_keyboard(int key, bool pressed)
 586 {
 587         unsigned int mod = app_get_modifiers();
 588
 589         if(debug_gui && !(pressed && (key == '`' || key == 27))) {
 590                 debug_gui_key(key, pressed, mod);
 591                 return; // ignore all keystrokes when GUI is visible
 592         }
 593
 594         if(pressed) {
 595                 switch(key) {
 596                 case 27:
 597                         app_quit();
 598                         break;
 599
 600                 case '\n':
 601                 case '\r':
 602                         if(mod & MOD_ALT) {
 603                                 app_toggle_fullscreen();
 604                         }
 605                         break;
 606
 607                 case '`':
 608                         debug_gui = !debug_gui;
 609                         show_message("debug gui %s", debug_gui ? "enabled" : "disabled");
 610                         break;
 611
 612                 case 'm':
 613                         app_toggle_grab_mouse();
 614                         show_message("mouse %s", app_is_mouse_grabbed() ? "grabbed" : "released");
 615                         break;
 616
 617                 case 'w':
 618                         if(mod & MOD_CTRL) {
 619                                 show_walk_mesh = !show_walk_mesh;
 620                                 show_message("walk mesh: %s", show_walk_mesh ? "on" : "off");
 621                         }
 622                         break;
 623
 624                 case 'c':
 625                         if(mod & MOD_CTRL) {
 626                                 noclip = !noclip;
 627                                 show_message(noclip ? "no clip" : "clip");
 628                         }
 629                         break;
 630
 631                 case 'f':
 632                         toggle_flight();
 633                         break;
 634
 635                 case 'p':
 636                         if(mod & MOD_CTRL) {
 637                                 fb_srgb = !fb_srgb;
 638                                 show_message("gamma correction for non-sRGB framebuffers: %s\n", fb_srgb ? "off" : "on");
 639                         }
 640                         break;
 641
 642                 case '=':
 643                         walk_speed *= 1.25;
 644                         show_message("walk speed: %g", walk_speed);
 645                         break;
 646
 647                 case '-':
 648                         walk_speed *= 0.75;
 649                         show_message("walk speed: %g", walk_speed);
 650                         break;
 651
 652                 case ']':
 653                         mouse_speed *= 1.2;
 654                         show_message("mouse speed: %g", mouse_speed);
 655                         break;
 656
 657                 case '[':
 658                         mouse_speed *= 0.8;
 659                         show_message("mouse speed: %g", mouse_speed);
 660                         break;
 661
 662                 case 'b':
 663                         show_blobs = !show_blobs;
 664                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 665                         break;
 666
 667                 case ' ':
 668                         goatvr_recenter();
 669                         show_message("VR recenter\n");
 670                         break;
 671
 672                 case KEY_UP:
 673                         exui_scroll(-1);
 674                         break;
 675
 676                 case KEY_DOWN:
 677                         exui_scroll(1);
 678                         break;
 679
 680                 case KEY_LEFT:
 681                         exui_change_tab(-1);
 682                         break;
 683
 684                 case KEY_RIGHT:
 685                         exui_change_tab(1);
 686                         break;
 687
 688                 case KEY_F5:
 689                 case KEY_F6:
 690                 case KEY_F7:
 691                 case KEY_F8:
 692                         dbg_key_pending |= 1 << (key - KEY_F5);
 693                         break;
 694                 }
 695         }
 696
 697         if(key < 256 && !(mod & (MOD_CTRL | MOD_ALT))) {
 698                 keystate[key] = pressed;
 699         }
 700 }
 701
 702 void app_mouse_button(int bn, bool pressed, int x, int y)
 703 {
 704         static int press_x, press_y;
 705
 706         if(debug_gui) {
 707                 debug_gui_mbutton(bn, pressed, x, y);
 708                 return; // ignore mouse events while GUI is visible
 709         }
 710
 711         prev_mx = x;
 712         prev_my = y;
 713         bnstate[bn] = pressed;
 714
 715         if(bn == 0) {
 716                 ExSelection sel;
 717                 Ray ray = calc_pick_ray(x, y);
 718                 sel = exman->select(ray);
 719
 720                 if(pressed) {
 721                         if(sel && (app_get_modifiers() & MOD_CTRL)) {
 722                                 exsel_grab_mouse = sel;
 723                                 Vec3 pos = sel.ex->node->get_position();
 724                                 debug_log("grabbing... (%g %g %g)\n", pos.x, pos.y, pos.z);
 725                                 exslot_mouse.node.set_position(pos);
 726                                 exslot_mouse.node.set_rotation(sel.ex->node->get_rotation());
 727                                 exslot_mouse.attach_exhibit(sel.ex, EXSLOT_ATTACH_TRANSIENT);
 728                                 if(exsel_active) {
 729                                         exsel_active = ExSelection::null;       // cancel active on grab
 730                                 }
 731                         }
 732                         press_x = x;
 733                         press_y = y;
 734
 735                 } else {
 736                         if(exsel_grab_mouse) {
 737                                 // cancel grab on mouse release
 738                                 Exhibit *ex = exsel_grab_mouse.ex;
 739                                 Vec3 pos = exslot_mouse.node.get_position();
 740
 741                                 debug_log("releasing at %g %g %g ...\n", pos.x, pos.y, pos.z);
 742
 743                                 exslot_mouse.detach_exhibit();
 744
 745                                 ExhibitSlot *slot = exman->nearest_empty_slot(pos, 100);
 746                                 if(!slot) {
 747                                         debug_log("no empty slot nearby\n");
 748                                         if(ex->prev_slot && ex->prev_slot->empty()) {
 749                                                 slot = ex->prev_slot;
 750                                                 debug_log("using previous slot");
 751                                         }
 752                                 }
 753
 754                                 if(slot) {
 755                                         slot->attach_exhibit(ex);
 756                                 } else {
 757                                         // nowhere to put it, so stash it for later
 758                                         exslot_mouse.detach_exhibit();
 759                                         exman->stash_exhibit(ex);
 760                                         debug_log("no slots available, stashing\n");
 761                                 }
 762
 763                                 exsel_grab_mouse = ExSelection::null;
 764                         }
 765
 766                         if(abs(press_x - x) < 5 && abs(press_y - y) < 5) {
 767                                 exsel_active = sel;     // select or deselect active exhibit
 768                                 if(sel) {
 769                                         debug_log("selecting...\n");
 770                                 } else {
 771                                         debug_log("deselecting...\n");
 772                                 }
 773                         }
 774
 775                         press_x = press_y = INT_MIN;
 776                 }
 777         }
 778 }
 779
 780 static inline void mouse_look(float dx, float dy)
 781 {
 782         float scrsz = (float)win_height;
 783         avatar.body_rot += dx * 512.0 / scrsz;
 784         avatar.head_alt += dy * 512.0 / scrsz;
 785
 786         if(avatar.head_alt < -90) avatar.head_alt = -90;
 787         if(avatar.head_alt > 90) avatar.head_alt = 90;
 788 }
 789
 790 static void mouse_zoom(float dx, float dy)
 791 {
 792         cam_dist += dy * 0.1;
 793         if(cam_dist < 0.0) cam_dist = 0.0;
 794 }
 795
 796 void app_mouse_motion(int x, int y)
 797 {
 798         if(debug_gui) {
 799                 debug_gui_mmotion(x, y);
 800                 return; // ignore mouse events while GUI is visible
 801         }
 802
 803         int dx = x - prev_mx;
 804         int dy = y - prev_my;
 805         prev_mx = x;
 806         prev_my = y;
 807
 808         if(!dx && !dy) return;
 809
 810         if(exsel_grab_mouse) {
 811                 Vec3 pos = exslot_mouse.node.get_node_position();
 812                 Vec3 dir = transpose(view_matrix.upper3x3()) * Vec3(dx * 1.0, dy * -1.0, 0);
 813
 814                 exslot_mouse.node.set_position(pos + dir);
 815         }
 816
 817         if(bnstate[2]) {
 818                 mouse_look(dx, dy);
 819         }
 820 }
 821
 822 void app_mouse_delta(int dx, int dy)
 823 {
 824         if(bnstate[2]) {
 825                 mouse_zoom(dx * mouse_speed, dy * mouse_speed);
 826         } else {
 827                 mouse_look(dx * mouse_speed, dy * mouse_speed);
 828         }
 829 }
 830
 831 void app_mouse_wheel(int dir)
 832 {
 833         if(debug_gui) {
 834                 debug_gui_wheel(dir);
 835         }
 836 }
 837
 838 void app_gamepad_axis(int axis, float val)
 839 {
 840         switch(axis) {
 841         case 0:
 842                 joy_move.x = val;
 843                 break;
 844         case 1:
 845                 joy_move.y = val;
 846                 break;
 847
 848         case 2:
 849                 joy_look.x = val;
 850                 break;
 851         case 3:
 852                 joy_look.y = val;
 853                 break;
 854         }
 855 }
 856
 857 void app_gamepad_button(int bn, bool pressed)
 858 {
 859         gpad_bnstate[bn] = pressed;
 860
 861         if(pressed) {
 862                 switch(bn) {
 863                 case GPAD_LSTICK:
 864                         toggle_flight();
 865                         break;
 866
 867                 case GPAD_X:
 868                         show_blobs = !show_blobs;
 869                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 870                         break;
 871
 872                 case GPAD_START:
 873                         goatvr_recenter();
 874                         show_message("VR recenter\n");
 875                         break;
 876
 877                 default:
 878                         break;
 879                 }
 880         }
 881 }
 882
 883 static void toggle_flight()
 884 {
 885         static float prev_walk_speed = -1.0;
 886         if(prev_walk_speed < 0.0) {
 887                 noclip = true;
 888                 prev_walk_speed = walk_speed;
 889                 walk_speed = 1000.0;
 890                 show_message("fly mode\n");
 891         } else {
 892                 noclip = false;
 893                 walk_speed = prev_walk_speed;
 894                 prev_walk_speed = -1.0;
 895                 show_message("walk mode\n");
 896         }
 897 }
 898
 899 static void calc_framerate()
 900 {
 901         //static int ncalc;
 902         static int nframes;
 903         static long prev_upd;
 904
 905         long elapsed = time_msec - prev_upd;
 906         if(elapsed >= 1000) {
 907                 framerate = (float)nframes / (float)(elapsed * 0.001);
 908                 nframes = 1;
 909                 prev_upd = time_msec;
 910
 911                 /*if(++ncalc >= 5) {
 912                         printf("fps: %f\n", framerate);
 913                         ncalc = 0;
 914                 }*/
 915         } else {
 916                 ++nframes;
 917         }
 918 }
 919
 920 static Ray calc_pick_ray(int x, int y)
 921 {
 922         float nx = (float)x / (float)win_width;
 923         float ny = (float)(win_height - y) / (float)win_height;
 924
 925         last_pick_ray = mouse_pick_ray(nx, ny, view_matrix, proj_matrix);
 926         return last_pick_ray;
 927 }