git.mutantstargoat.com Git - laserbrain_demo/blob - src/app.cc

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