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         // use goatvr sticks for joystick input
 282         int num_vr_sticks = goatvr_num_sticks();
 283         if(num_vr_sticks > 0) {
 284                 float p[2];
 285                 goatvr_stick_pos(0, p);
 286                 joy_move.x = p[0];
 287                 joy_move.y = -p[1];
 288         }
 289         if(num_vr_sticks > 1) {
 290                 float p[2];
 291                 goatvr_stick_pos(1, p);
 292                 joy_look.x = p[0];
 293         }
 294
 295
 296         float speed = walk_speed * dt;
 297         Vec3 dir;
 298
 299         // joystick
 300         float jdeadsq = joy_deadzone * joy_deadzone;
 301         float jmove_lensq = length_sq(joy_move);
 302         float jlook_lensq = length_sq(joy_look);
 303
 304         if(jmove_lensq > jdeadsq) {
 305                 float len = sqrt(jmove_lensq);
 306                 jmove_lensq -= jdeadsq;
 307
 308                 float mag = len * len;
 309                 dir.x += mag * joy_move.x / len * 2.0 * speed;
 310                 dir.z += mag * joy_move.y / len * 2.0 * speed;
 311         }
 312         if(jlook_lensq > jdeadsq) {
 313                 float len = sqrt(jlook_lensq);
 314                 jlook_lensq -= jdeadsq;
 315
 316                 float mag = len * len;
 317                 avatar.body_rot += mag * joy_look.x / len * 200.0 * dt;
 318                 avatar.head_alt += mag * joy_look.y / len * 100.0 * dt;
 319                 if(avatar.head_alt < -90.0f) avatar.head_alt = -90.0f;
 320                 if(avatar.head_alt > 90.0f) avatar.head_alt = 90.0f;
 321         }
 322
 323         // keyboard move
 324         if(keystate[(int)'w']) {
 325                 dir.z -= speed;
 326         }
 327         if(keystate[(int)'s']) {
 328                 dir.z += speed;
 329         }
 330         if(keystate[(int)'d']) {
 331                 dir.x += speed;
 332         }
 333         if(keystate[(int)'a']) {
 334                 dir.x -= speed;
 335         }
 336         if(keystate[(int)'q'] || gpad_bnstate[GPAD_UP]) {
 337                 avatar.pos.y += speed;
 338         }
 339         if(keystate[(int)'z'] || gpad_bnstate[GPAD_DOWN]) {
 340                 avatar.pos.y -= speed;
 341         }
 342
 343         float theta = M_PI * avatar.body_rot / 180.0f;
 344         Vec3 newpos;
 345         newpos.x = avatar.pos.x + cos(theta) * dir.x - sin(theta) * dir.z;
 346         newpos.y = avatar.pos.y;
 347         newpos.z = avatar.pos.z + sin(theta) * dir.x + cos(theta) * dir.z;
 348
 349         if(noclip) {
 350                 avatar.pos = newpos;
 351         } else {
 352                 if(!constrain_walk_mesh(newpos, &avatar.pos)) {
 353                         float dtheta = M_PI / 32.0;
 354                         float theta = dtheta;
 355                         Vec2 dir2d = newpos.xz() - avatar.pos.xz();
 356
 357                         for(int i=0; i<16; i++) {
 358                                 Vec2 dvec = rotate(dir2d, theta);
 359                                 Vec3 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 360                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 361                                         break;
 362                                 }
 363                                 dvec = rotate(dir2d, -theta);
 364                                 pos = avatar.pos + Vec3(dvec.x, 0, dvec.y);
 365                                 if(constrain_walk_mesh(pos, &avatar.pos)) {
 366                                         break;
 367                                 }
 368                                 theta += dtheta;
 369                         }
 370                 }
 371                 floor_y = avatar.pos.y - user_eye_height;
 372         }
 373
 374         // TODO move to the avatar system
 375         // calculate mouselook view matrix
 376         mouse_view_matrix = Mat4::identity;
 377         mouse_view_matrix.pre_translate(0, 0, -cam_dist);
 378         if(!have_headtracking) {
 379                 mouse_view_matrix.pre_rotate_x(deg_to_rad(avatar.head_alt));
 380         }
 381         mouse_view_matrix.pre_rotate_y(deg_to_rad(avatar.body_rot));
 382         mouse_view_matrix.pre_translate(-avatar.pos.x, -avatar.pos.y, -avatar.pos.z);
 383
 384
 385         // update hand-tracking
 386         if(have_handtracking) {
 387                 update_vrhands(&avatar);
 388
 389                 if(vrhand[0].valid) {
 390                         exslot_left.node.set_position(vrhand[0].pos);
 391                         exslot_left.node.set_rotation(vrhand[0].rot);
 392
 393                         // right hand takes precedence for hover
 394                         if(!exsel_grab_left && !exsel_hover) {
 395                                 exsel_hover = exman->select(Sphere(vrhand[0].pos, 5));
 396                         }
 397                 }
 398                 if(vrhand[1].valid) {
 399                         exslot_right.node.set_position(vrhand[1].pos);
 400                         exslot_right.node.set_rotation(vrhand[1].rot);
 401
 402                         if(!exsel_grab_right) {
 403                                 exsel_hover = exman->select(Sphere(vrhand[1].pos, 5));
 404                         }
 405                 }
 406
 407         } else {
 408                 // check if an exhibit is hovered-over by mouse (only if we don't have one grabbed)
 409                 if(!exsel_grab_mouse) {
 410                         Ray ray = calc_pick_ray(prev_mx, prev_my);
 411                         exsel_hover = exman->select(ray);
 412                 }
 413
 414                 // TODO do this properly
 415                 // set the position of the left hand at a suitable position for the exhibit UI
 416                 dir = rotate(Vec3(-0.46, -0.1, -1), Vec3(0, 1, 0), deg_to_rad(-avatar.body_rot));
 417                 exslot_left.node.set_position(avatar.pos + dir * 30); // magic: distance in front
 418         }
 419
 420         if(!exslot_right.empty()) exslot_right.node.update(dt);
 421         // always update the left slot, because it's the anchor point of the exhibit ui
 422         exslot_left.node.update(dt);
 423 }
 424
 425 void app_display()
 426 {
 427         float dt = (float)(time_msec - prev_msec) / 1000.0f;
 428         prev_msec = time_msec;
 429
 430         if(debug_gui) {
 431                 ImGui::GetIOPtr()->DeltaTime = dt;
 432                 ImGui::NewFrame();
 433
 434                 //ImGui::ShowTestWindow();
 435         }
 436
 437         glClearColor(1, 1, 1, 1);
 438
 439         if(opt.vr) {
 440                 // VR mode
 441                 goatvr_draw_start();
 442                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 443
 444                 unsigned int gfbo = goatvr_get_fbo();
 445
 446                 update(dt);
 447
 448                 for(int i=0; i<2; i++) {
 449                         // for each eye
 450                         goatvr_draw_eye(i);
 451                         if(gfbo) {
 452                                 vp_width = goatvr_get_fb_eye_width(i);
 453                                 vp_height = goatvr_get_fb_eye_height(i);
 454
 455                                 // this is a lightweight operation
 456                                 goatvr_rtarg->create_wrap_fbo(gfbo, vp_width, vp_height);
 457                                 push_render_target(goatvr_rtarg, RT_FAKE);
 458                         } else {
 459                                 vp_width = win_width / 2;
 460                         }
 461
 462                         proj_matrix = goatvr_projection_matrix(i, NEAR_CLIP, FAR_CLIP);
 463                         glMatrixMode(GL_PROJECTION);
 464                         glLoadMatrixf(proj_matrix[0]);
 465
 466                         view_matrix = mouse_view_matrix * Mat4(goatvr_view_matrix(i));
 467                         glMatrixMode(GL_MODELVIEW);
 468                         glLoadMatrixf(view_matrix[0]);
 469
 470                         draw_scene();
 471                         if(have_handtracking) {
 472                                 draw_vrhands();
 473                         }
 474
 475                         if(debug_gui) {
 476                                 ImGui::Render();
 477                         }
 478
 479                         if(gfbo) {
 480                                 pop_render_target(RT_FAKE);
 481                         }
 482                 }
 483
 484                 goatvr_draw_done();
 485
 486                 vp_width = win_width;
 487                 vp_height = win_height;
 488
 489                 if(should_swap) {
 490                         app_swap_buffers();
 491                 }
 492
 493         } else {
 494                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 495
 496                 update(dt);
 497
 498                 proj_matrix.perspective(deg_to_rad(50.0), win_aspect, NEAR_CLIP, FAR_CLIP);
 499                 glMatrixMode(GL_PROJECTION);
 500                 glLoadMatrixf(proj_matrix[0]);
 501
 502                 view_matrix = mouse_view_matrix;
 503                 glMatrixMode(GL_MODELVIEW);
 504                 glLoadMatrixf(view_matrix[0]);
 505
 506                 draw_scene();
 507
 508                 if(!fb_srgb && sdr_post_gamma) {
 509                         slow_post(sdr_post_gamma);
 510                         glUseProgram(0);
 511                 }
 512
 513                 if(debug_gui) {
 514                         ImGui::Render();
 515                 }
 516                 app_swap_buffers();
 517         }
 518         assert(glGetError() == GL_NO_ERROR);
 519
 520         calc_framerate();
 521 }
 522
 523
 524 static void draw_scene()
 525 {
 526         rend->draw();
 527         exman->draw();
 528
 529         if(have_handtracking) {
 530                 Mat4 head_xform = inverse(mouse_view_matrix);//goatvr_head_matrix();
 531                 Mat4 head_dir_xform = head_xform.upper3x3();
 532
 533                 glUseProgram(0);
 534                 glPushAttrib(GL_ENABLE_BIT);
 535                 glDisable(GL_LIGHTING);
 536                 glBegin(GL_LINES);
 537                 for(int i=0; i<2; i++) {
 538                         if(vrhand[i].valid) {
 539                                 glColor3f(i, 1 - i, i);
 540                         } else {
 541                                 glColor3f(0.5, 0.5, 0.5);
 542                         }
 543                         Vec3 v = head_xform * vrhand[i].pos;
 544                         Vec3 dir = head_dir_xform * rotate(Vec3(0, 0, -1), vrhand[i].rot) * 20.0f;
 545                         Vec3 up = head_dir_xform * rotate(Vec3(0, 1, 0), vrhand[i].rot) * 10.0f;
 546                         Vec3 right = head_dir_xform * rotate(Vec3(1, 0, 0), vrhand[i].rot) * 10.0f;
 547
 548                         glVertex3f(v.x, v.y, v.z);
 549                         glVertex3f(v.x + dir.x, v.y + dir.y, v.z + dir.z);
 550                         glVertex3f(v.x - right.x, v.y - right.y, v.z - right.z);
 551                         glVertex3f(v.x + right.x, v.y + right.y, v.z + right.z);
 552                         glVertex3f(v.x - up.x, v.y - up.y, v.z - up.z);
 553                         glVertex3f(v.x + up.x, v.y + up.y, v.z + up.z);
 554                 }
 555                 glEnd();
 556                 glPopAttrib();
 557         }
 558
 559         if(debug_gui && dbg_sel_node) {
 560                 AABox bvol = dbg_sel_node->get_bounds();
 561                 draw_geom_object(&bvol);
 562         }
 563
 564         if(show_walk_mesh && mscn->walk_mesh) {
 565                 glPushAttrib(GL_ENABLE_BIT);
 566                 glEnable(GL_BLEND);
 567                 glBlendFunc(GL_ONE, GL_ONE);
 568                 glEnable(GL_POLYGON_OFFSET_FILL);
 569
 570                 glUseProgram(0);
 571
 572                 glPolygonOffset(-1, 1);
 573                 glDepthMask(0);
 574
 575                 glColor3f(0.3, 0.08, 0.01);
 576                 mscn->walk_mesh->draw();
 577
 578                 glDepthMask(1);
 579
 580                 glPopAttrib();
 581         }
 582
 583         exui_draw();
 584
 585         print_text(Vec2(9 * win_width / 10, 20), Vec3(1, 1, 0), "fps: %.1f", framerate);
 586         draw_ui();
 587 }
 588
 589
 590 void app_reshape(int x, int y)
 591 {
 592         glViewport(0, 0, x, y);
 593         goatvr_set_fb_size(x, y, 1.0f);
 594         debug_gui_reshape(x, y);
 595
 596         vp_width = x;
 597         vp_height = y;
 598 }
 599
 600 void app_keyboard(int key, bool pressed)
 601 {
 602         unsigned int mod = app_get_modifiers();
 603
 604         if(debug_gui && !(pressed && (key == '`' || key == 27))) {
 605                 debug_gui_key(key, pressed, mod);
 606                 return; // ignore all keystrokes when GUI is visible
 607         }
 608
 609         if(pressed) {
 610                 switch(key) {
 611                 case 27:
 612                         app_quit();
 613                         break;
 614
 615                 case '\n':
 616                 case '\r':
 617                         if(mod & MOD_ALT) {
 618                                 app_toggle_fullscreen();
 619                         }
 620                         break;
 621
 622                 case '`':
 623                         debug_gui = !debug_gui;
 624                         show_message("debug gui %s", debug_gui ? "enabled" : "disabled");
 625                         break;
 626
 627                 case 'm':
 628                         app_toggle_grab_mouse();
 629                         show_message("mouse %s", app_is_mouse_grabbed() ? "grabbed" : "released");
 630                         break;
 631
 632                 case 'w':
 633                         if(mod & MOD_CTRL) {
 634                                 show_walk_mesh = !show_walk_mesh;
 635                                 show_message("walk mesh: %s", show_walk_mesh ? "on" : "off");
 636                         }
 637                         break;
 638
 639                 case 'c':
 640                         if(mod & MOD_CTRL) {
 641                                 noclip = !noclip;
 642                                 show_message(noclip ? "no clip" : "clip");
 643                         }
 644                         break;
 645
 646                 case 'f':
 647                         toggle_flight();
 648                         break;
 649
 650                 case 'p':
 651                         if(mod & MOD_CTRL) {
 652                                 fb_srgb = !fb_srgb;
 653                                 show_message("gamma correction for non-sRGB framebuffers: %s\n", fb_srgb ? "off" : "on");
 654                         }
 655                         break;
 656
 657                 case '=':
 658                         walk_speed *= 1.25;
 659                         show_message("walk speed: %g", walk_speed);
 660                         break;
 661
 662                 case '-':
 663                         walk_speed *= 0.75;
 664                         show_message("walk speed: %g", walk_speed);
 665                         break;
 666
 667                 case ']':
 668                         mouse_speed *= 1.2;
 669                         show_message("mouse speed: %g", mouse_speed);
 670                         break;
 671
 672                 case '[':
 673                         mouse_speed *= 0.8;
 674                         show_message("mouse speed: %g", mouse_speed);
 675                         break;
 676
 677                 case 'b':
 678                         show_blobs = !show_blobs;
 679                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 680                         break;
 681
 682                 case ' ':
 683                         goatvr_recenter();
 684                         show_message("VR recenter\n");
 685                         break;
 686
 687                 case KEY_UP:
 688                         exui_scroll(-1);
 689                         break;
 690
 691                 case KEY_DOWN:
 692                         exui_scroll(1);
 693                         break;
 694
 695                 case KEY_LEFT:
 696                         exui_change_tab(-1);
 697                         break;
 698
 699                 case KEY_RIGHT:
 700                         exui_change_tab(1);
 701                         break;
 702
 703                 case KEY_F5:
 704                 case KEY_F6:
 705                 case KEY_F7:
 706                 case KEY_F8:
 707                         dbg_key_pending |= 1 << (key - KEY_F5);
 708                         break;
 709                 }
 710         }
 711
 712         if(key < 256 && !(mod & (MOD_CTRL | MOD_ALT))) {
 713                 keystate[key] = pressed;
 714         }
 715 }
 716
 717 void app_mouse_button(int bn, bool pressed, int x, int y)
 718 {
 719         static int press_x, press_y;
 720
 721         if(debug_gui) {
 722                 debug_gui_mbutton(bn, pressed, x, y);
 723                 return; // ignore mouse events while GUI is visible
 724         }
 725
 726         prev_mx = x;
 727         prev_my = y;
 728         bnstate[bn] = pressed;
 729
 730         if(bn == 0) {
 731                 ExSelection sel;
 732                 Ray ray = calc_pick_ray(x, y);
 733                 sel = exman->select(ray);
 734
 735                 if(pressed) {
 736                         if(sel && (app_get_modifiers() & MOD_CTRL)) {
 737                                 exsel_grab_mouse = sel;
 738                                 Vec3 pos = sel.ex->node->get_position();
 739                                 debug_log("grabbing... (%g %g %g)\n", pos.x, pos.y, pos.z);
 740                                 exslot_mouse.node.set_position(pos);
 741                                 exslot_mouse.node.set_rotation(sel.ex->node->get_rotation());
 742                                 exslot_mouse.attach_exhibit(sel.ex, EXSLOT_ATTACH_TRANSIENT);
 743                                 if(exsel_active) {
 744                                         exsel_active = ExSelection::null;       // cancel active on grab
 745                                 }
 746                         }
 747                         press_x = x;
 748                         press_y = y;
 749
 750                 } else {
 751                         if(exsel_grab_mouse) {
 752                                 // cancel grab on mouse release
 753                                 Exhibit *ex = exsel_grab_mouse.ex;
 754                                 Vec3 pos = exslot_mouse.node.get_position();
 755
 756                                 debug_log("releasing at %g %g %g ...\n", pos.x, pos.y, pos.z);
 757
 758                                 exslot_mouse.detach_exhibit();
 759
 760                                 ExhibitSlot *slot = exman->nearest_empty_slot(pos, 100);
 761                                 if(!slot) {
 762                                         debug_log("no empty slot nearby\n");
 763                                         if(ex->prev_slot && ex->prev_slot->empty()) {
 764                                                 slot = ex->prev_slot;
 765                                                 debug_log("using previous slot");
 766                                         }
 767                                 }
 768
 769                                 if(slot) {
 770                                         slot->attach_exhibit(ex);
 771                                 } else {
 772                                         // nowhere to put it, so stash it for later
 773                                         exslot_mouse.detach_exhibit();
 774                                         exman->stash_exhibit(ex);
 775                                         debug_log("no slots available, stashing\n");
 776                                 }
 777
 778                                 exsel_grab_mouse = ExSelection::null;
 779                         }
 780
 781                         if(abs(press_x - x) < 5 && abs(press_y - y) < 5) {
 782                                 exsel_active = sel;     // select or deselect active exhibit
 783                                 if(sel) {
 784                                         debug_log("selecting...\n");
 785                                 } else {
 786                                         debug_log("deselecting...\n");
 787                                 }
 788                         }
 789
 790                         press_x = press_y = INT_MIN;
 791                 }
 792         }
 793 }
 794
 795 static inline void mouse_look(float dx, float dy)
 796 {
 797         float scrsz = (float)win_height;
 798         avatar.body_rot += dx * 512.0 / scrsz;
 799         avatar.head_alt += dy * 512.0 / scrsz;
 800
 801         if(avatar.head_alt < -90) avatar.head_alt = -90;
 802         if(avatar.head_alt > 90) avatar.head_alt = 90;
 803 }
 804
 805 static void mouse_zoom(float dx, float dy)
 806 {
 807         cam_dist += dy * 0.1;
 808         if(cam_dist < 0.0) cam_dist = 0.0;
 809 }
 810
 811 void app_mouse_motion(int x, int y)
 812 {
 813         if(debug_gui) {
 814                 debug_gui_mmotion(x, y);
 815                 return; // ignore mouse events while GUI is visible
 816         }
 817
 818         int dx = x - prev_mx;
 819         int dy = y - prev_my;
 820         prev_mx = x;
 821         prev_my = y;
 822
 823         if(!dx && !dy) return;
 824
 825         if(exsel_grab_mouse) {
 826                 Vec3 pos = exslot_mouse.node.get_node_position();
 827                 Vec3 dir = transpose(view_matrix.upper3x3()) * Vec3(dx * 1.0, dy * -1.0, 0);
 828
 829                 exslot_mouse.node.set_position(pos + dir);
 830         }
 831
 832         if(bnstate[2]) {
 833                 mouse_look(dx, dy);
 834         }
 835 }
 836
 837 void app_mouse_delta(int dx, int dy)
 838 {
 839         if(bnstate[2]) {
 840                 mouse_zoom(dx * mouse_speed, dy * mouse_speed);
 841         } else {
 842                 mouse_look(dx * mouse_speed, dy * mouse_speed);
 843         }
 844 }
 845
 846 void app_mouse_wheel(int dir)
 847 {
 848         if(debug_gui) {
 849                 debug_gui_wheel(dir);
 850         }
 851 }
 852
 853 void app_gamepad_axis(int axis, float val)
 854 {
 855         switch(axis) {
 856         case 0:
 857                 joy_move.x = val;
 858                 break;
 859         case 1:
 860                 joy_move.y = val;
 861                 break;
 862
 863         case 2:
 864                 joy_look.x = val;
 865                 break;
 866         case 3:
 867                 joy_look.y = val;
 868                 break;
 869         }
 870 }
 871
 872 void app_gamepad_button(int bn, bool pressed)
 873 {
 874         gpad_bnstate[bn] = pressed;
 875
 876         if(pressed) {
 877                 switch(bn) {
 878                 case GPAD_LSTICK:
 879                         toggle_flight();
 880                         break;
 881
 882                 case GPAD_X:
 883                         show_blobs = !show_blobs;
 884                         show_message("blobs: %s\n", show_blobs ? "on" : "off");
 885                         break;
 886
 887                 case GPAD_START:
 888                         goatvr_recenter();
 889                         show_message("VR recenter\n");
 890                         break;
 891
 892                 default:
 893                         break;
 894                 }
 895         }
 896 }
 897
 898 static void toggle_flight()
 899 {
 900         static float prev_walk_speed = -1.0;
 901         if(prev_walk_speed < 0.0) {
 902                 noclip = true;
 903                 prev_walk_speed = walk_speed;
 904                 walk_speed = 1000.0;
 905                 show_message("fly mode\n");
 906         } else {
 907                 noclip = false;
 908                 walk_speed = prev_walk_speed;
 909                 prev_walk_speed = -1.0;
 910                 show_message("walk mode\n");
 911         }
 912 }
 913
 914 static void calc_framerate()
 915 {
 916         //static int ncalc;
 917         static int nframes;
 918         static long prev_upd;
 919
 920         long elapsed = time_msec - prev_upd;
 921         if(elapsed >= 1000) {
 922                 framerate = (float)nframes / (float)(elapsed * 0.001);
 923                 nframes = 1;
 924                 prev_upd = time_msec;
 925
 926                 /*if(++ncalc >= 5) {
 927                         printf("fps: %f\n", framerate);
 928                         ncalc = 0;
 929                 }*/
 930         } else {
 931                 ++nframes;
 932         }
 933 }
 934
 935 static Ray calc_pick_ray(int x, int y)
 936 {
 937         float nx = (float)x / (float)win_width;
 938         float ny = (float)(win_height - y) / (float)win_height;
 939
 940         last_pick_ray = mouse_pick_ray(nx, ny, view_matrix, proj_matrix);
 941         return last_pick_ray;
 942 }