src/camera.cpp

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "camera.h"
  21 #include "debug.h"
  22 #include "client.h"
  23 #include "main.h" // for g_settings
  24 #include "map.h"
  25 #include "clientmap.h" // MapDrawControl
  26 #include "mesh.h"
  27 #include "player.h"
  28 #include "tile.h"
  29 #include <cmath>
  30 #include "settings.h"
  31 #include "itemdef.h" // For wield visualization
  32 #include "noise.h" // easeCurve
  33 #include "gamedef.h"
  34 #include "sound.h"
  35 #include "event.h"
  36
  37 Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
  38                 IGameDef *gamedef):
  39         m_smgr(smgr),
  40         m_playernode(NULL),
  41         m_headnode(NULL),
  42         m_cameranode(NULL),
  43
  44         m_wieldmgr(NULL),
  45         m_wieldnode(NULL),
  46         m_wieldlight(0),
  47
  48         m_draw_control(draw_control),
  49         m_gamedef(gamedef),
  50
  51         m_camera_position(0,0,0),
  52         m_camera_direction(0,0,0),
  53
  54         m_aspect(1.0),
  55         m_fov_x(1.0),
  56         m_fov_y(1.0),
  57
  58         m_added_frametime(0),
  59         m_added_frames(0),
  60         m_range_old(0),
  61         m_frametime_old(0),
  62         m_frametime_counter(0),
  63         m_time_per_range(30. / 50), // a sane default of 30ms per 50 nodes of range
  64
  65         m_view_bobbing_anim(0),
  66         m_view_bobbing_state(0),
  67         m_view_bobbing_speed(0),
  68
  69         m_digging_anim(0),
  70         m_digging_button(-1)
  71 {
  72         //dstream<<__FUNCTION_NAME<<std::endl;
  73
  74         // note: making the camera node a child of the player node
  75         // would lead to unexpected behaviour, so we don't do that.
  76         m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
  77         m_headnode = smgr->addEmptySceneNode(m_playernode);
  78         m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
  79         m_cameranode->bindTargetAndRotation(true);
  80
  81         // This needs to be in its own scene manager. It is drawn after
  82         // all other 3D scene nodes and before the GUI.
  83         m_wieldmgr = smgr->createNewSceneManager();
  84         m_wieldmgr->addCameraSceneNode();
  85         m_wieldnode = m_wieldmgr->addMeshSceneNode(createCubeMesh(v3f(1,1,1)), NULL);  // need a dummy mesh
  86 }
  87
  88 Camera::~Camera()
  89 {
  90         m_wieldnode->setMesh(NULL);
  91         m_wieldmgr->drop();
  92 }
  93
  94 bool Camera::successfullyCreated(std::wstring& error_message)
  95 {
  96         if (m_playernode == NULL)
  97         {
  98                 error_message = L"Failed to create the player scene node";
  99                 return false;
 100         }
 101         if (m_headnode == NULL)
 102         {
 103                 error_message = L"Failed to create the head scene node";
 104                 return false;
 105         }
 106         if (m_cameranode == NULL)
 107         {
 108                 error_message = L"Failed to create the camera scene node";
 109                 return false;
 110         }
 111         if (m_wieldmgr == NULL)
 112         {
 113                 error_message = L"Failed to create the wielded item scene manager";
 114                 return false;
 115         }
 116         if (m_wieldnode == NULL)
 117         {
 118                 error_message = L"Failed to create the wielded item scene node";
 119                 return false;
 120         }
 121         return true;
 122 }
 123
 124 // Returns the fractional part of x
 125 inline f32 my_modf(f32 x)
 126 {
 127         double dummy;
 128         return modf(x, &dummy);
 129 }
 130
 131 void Camera::step(f32 dtime)
 132 {
 133         if (m_view_bobbing_state != 0)
 134         {
 135                 //f32 offset = dtime * m_view_bobbing_speed * 0.035;
 136                 f32 offset = dtime * m_view_bobbing_speed * 0.030;
 137                 if (m_view_bobbing_state == 2)
 138                 {
 139 #if 0
 140                         // Animation is getting turned off
 141                         if (m_view_bobbing_anim < 0.5)
 142                                 m_view_bobbing_anim -= offset;
 143                         else
 144                                 m_view_bobbing_anim += offset;
 145                         if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1)
 146                         {
 147                                 m_view_bobbing_anim = 0;
 148                                 m_view_bobbing_state = 0;
 149                         }
 150 #endif
 151 #if 1
 152                         // Animation is getting turned off
 153                         if(m_view_bobbing_anim < 0.25){
 154                                 m_view_bobbing_anim -= offset;
 155                         } else if(m_view_bobbing_anim > 0.75){
 156                                 m_view_bobbing_anim += offset;
 157                         } if(m_view_bobbing_anim < 0.5){
 158                                 m_view_bobbing_anim += offset;
 159                                 if(m_view_bobbing_anim > 0.5)
 160                                         m_view_bobbing_anim = 0.5;
 161                         } else {
 162                                 m_view_bobbing_anim -= offset;
 163                                 if(m_view_bobbing_anim < 0.5)
 164                                         m_view_bobbing_anim = 0.5;
 165                         }
 166                         if(m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
 167                                         fabs(m_view_bobbing_anim - 0.5) < 0.01)
 168                         {
 169                                 m_view_bobbing_anim = 0;
 170                                 m_view_bobbing_state = 0;
 171                         }
 172 #endif
 173                 }
 174                 else
 175                 {
 176                         float was = m_view_bobbing_anim;
 177                         m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
 178                         bool step = (was == 0 ||
 179                                         (was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
 180                                         (was > 0.5f && m_view_bobbing_anim <= 0.5f));
 181                         if(step){
 182                                 MtEvent *e = new SimpleTriggerEvent("ViewBobbingStep");
 183                                 m_gamedef->event()->put(e);
 184                         }
 185                 }
 186         }
 187
 188         if (m_digging_button != -1)
 189         {
 190                 f32 offset = dtime * 3.5;
 191                 float m_digging_anim_was = m_digging_anim;
 192                 m_digging_anim += offset;
 193                 if (m_digging_anim >= 1)
 194                 {
 195                         m_digging_anim = 0;
 196                         m_digging_button = -1;
 197                 }
 198                 float lim = 0.15;
 199                 if(m_digging_anim_was < lim && m_digging_anim >= lim)
 200                 {
 201                         if(m_digging_button == 0){
 202                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchLeft");
 203                                 m_gamedef->event()->put(e);
 204                         } else if(m_digging_button == 1){
 205                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchRight");
 206                                 m_gamedef->event()->put(e);
 207                         }
 208                 }
 209         }
 210 }
 211
 212 void Camera::update(LocalPlayer* player, f32 frametime, v2u32 screensize,
 213                 f32 tool_reload_ratio)
 214 {
 215         // Set player node transformation
 216         m_playernode->setPosition(player->getPosition());
 217         m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
 218         m_playernode->updateAbsolutePosition();
 219
 220         // Set head node transformation
 221         m_headnode->setPosition(player->getEyeOffset());
 222         m_headnode->setRotation(v3f(player->getPitch(), 0, 0));
 223         m_headnode->updateAbsolutePosition();
 224
 225         // Compute relative camera position and target
 226         v3f rel_cam_pos = v3f(0,0,0);
 227         v3f rel_cam_target = v3f(0,0,1);
 228         v3f rel_cam_up = v3f(0,1,0);
 229
 230         if (m_view_bobbing_anim != 0)
 231         {
 232                 f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
 233                 f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;
 234
 235                 #if 1
 236                 f32 bobknob = 1.2;
 237                 f32 bobtmp = sin(pow(bobfrac, bobknob) * PI);
 238                 //f32 bobtmp2 = cos(pow(bobfrac, bobknob) * PI);
 239
 240                 v3f bobvec = v3f(
 241                         0.3 * bobdir * sin(bobfrac * PI),
 242                         -0.28 * bobtmp * bobtmp,
 243                         0.);
 244
 245                 //rel_cam_pos += 0.2 * bobvec;
 246                 //rel_cam_target += 0.03 * bobvec;
 247                 //rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * PI);
 248                 float f = 1.0;
 249                 f *= g_settings->getFloat("view_bobbing_amount");
 250                 rel_cam_pos += bobvec * f;
 251                 //rel_cam_target += 0.995 * bobvec * f;
 252                 rel_cam_target += bobvec * f;
 253                 rel_cam_target.Z -= 0.005 * bobvec.Z * f;
 254                 //rel_cam_target.X -= 0.005 * bobvec.X * f;
 255                 //rel_cam_target.Y -= 0.005 * bobvec.Y * f;
 256                 rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * PI * f);
 257                 #else
 258                 f32 angle_deg = 1 * bobdir * sin(bobfrac * PI);
 259                 f32 angle_rad = angle_deg * PI / 180;
 260                 f32 r = 0.05;
 261                 v3f off = v3f(
 262                         r * sin(angle_rad),
 263                         r * (cos(angle_rad) - 1),
 264                         0);
 265                 rel_cam_pos += off;
 266                 //rel_cam_target += off;
 267                 rel_cam_up.rotateXYBy(angle_deg);
 268                 #endif
 269
 270         }
 271
 272         // Compute absolute camera position and target
 273         m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
 274         m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);
 275
 276         v3f abs_cam_up;
 277         m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 278
 279         // Set camera node transformation
 280         m_cameranode->setPosition(m_camera_position);
 281         m_cameranode->setUpVector(abs_cam_up);
 282         // *100.0 helps in large map coordinates
 283         m_cameranode->setTarget(m_camera_position + 100 * m_camera_direction);
 284
 285         // Get FOV setting
 286         f32 fov_degrees = g_settings->getFloat("fov");
 287         fov_degrees = MYMAX(fov_degrees, 10.0);
 288         fov_degrees = MYMIN(fov_degrees, 170.0);
 289
 290         // FOV and aspect ratio
 291         m_aspect = (f32)screensize.X / (f32) screensize.Y;
 292         m_fov_y = fov_degrees * PI / 180.0;
 293         // Increase vertical FOV on lower aspect ratios (<16:10)
 294         m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
 295         // WTF is this? It can't be right
 296         m_fov_x = 2 * atan(0.5 * m_aspect * tan(m_fov_y));
 297         m_cameranode->setAspectRatio(m_aspect);
 298         m_cameranode->setFOV(m_fov_y);
 299
 300         // Position the wielded item
 301         //v3f wield_position = v3f(45, -35, 65);
 302         v3f wield_position = v3f(55, -35, 65);
 303         //v3f wield_rotation = v3f(-100, 120, -100);
 304         v3f wield_rotation = v3f(-100, 120, -100);
 305         if(m_digging_anim < 0.05 || m_digging_anim > 0.5){
 306                 f32 frac = 1.0;
 307                 if(m_digging_anim > 0.5)
 308                         frac = 2.0 * (m_digging_anim - 0.5);
 309                 // This value starts from 1 and settles to 0
 310                 f32 ratiothing = pow((1.0f - tool_reload_ratio), 0.5f);
 311                 //f32 ratiothing2 = pow(ratiothing, 0.5f);
 312                 f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
 313                 wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
 314                 //wield_position.Z += frac * 5.0 * ratiothing2;
 315                 wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
 316                 wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
 317                 //wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
 318                 //wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
 319         }
 320         if (m_digging_button != -1)
 321         {
 322                 f32 digfrac = m_digging_anim;
 323                 wield_position.X -= 30 * sin(pow(digfrac, 0.8f) * PI);
 324                 wield_position.Y += 15 * sin(digfrac * 2 * PI);
 325                 wield_position.Z += 5 * digfrac;
 326
 327                 // Euler angles are PURE EVIL, so why not use quaternions?
 328                 core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
 329                 core::quaternion quat_end(v3f(90, -10, -130) * core::DEGTORAD);
 330                 core::quaternion quat_slerp;
 331                 quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * PI));
 332                 quat_slerp.toEuler(wield_rotation);
 333                 wield_rotation *= core::RADTODEG;
 334         }
 335         else {
 336                 f32 bobfrac = my_modf(m_view_bobbing_anim);
 337                 wield_position.X -= sin(bobfrac*PI*2.0) * 3.0;
 338                 wield_position.Y += sin(my_modf(bobfrac*2.0)*PI) * 3.0;
 339         }
 340         m_wieldnode->setPosition(wield_position);
 341         m_wieldnode->setRotation(wield_rotation);
 342         m_wieldlight = player->light;
 343
 344         // Render distance feedback loop
 345         updateViewingRange(frametime);
 346
 347         // If the player seems to be walking on solid ground,
 348         // view bobbing is enabled and free_move is off,
 349         // start (or continue) the view bobbing animation.
 350         v3f speed = player->getSpeed();
 351         if ((hypot(speed.X, speed.Z) > BS) &&
 352                 (player->touching_ground) &&
 353                 (g_settings->getBool("view_bobbing") == true) &&
 354                 (g_settings->getBool("free_move") == false))
 355         {
 356                 // Start animation
 357                 m_view_bobbing_state = 1;
 358                 m_view_bobbing_speed = MYMIN(speed.getLength(), 40);
 359         }
 360         else if (m_view_bobbing_state == 1)
 361         {
 362                 // Stop animation
 363                 m_view_bobbing_state = 2;
 364                 m_view_bobbing_speed = 60;
 365         }
 366 }
 367
 368 void Camera::updateViewingRange(f32 frametime_in)
 369 {
 370         if (m_draw_control.range_all)
 371                 return;
 372
 373         m_added_frametime += frametime_in;
 374         m_added_frames += 1;
 375
 376         // Actually this counter kind of sucks because frametime is busytime
 377         m_frametime_counter -= frametime_in;
 378         if (m_frametime_counter > 0)
 379                 return;
 380         m_frametime_counter = 0.2;
 381
 382         /*dstream<<__FUNCTION_NAME
 383                         <<": Collected "<<m_added_frames<<" frames, total of "
 384                         <<m_added_frametime<<"s."<<std::endl;
 385
 386         dstream<<"m_draw_control.blocks_drawn="
 387                         <<m_draw_control.blocks_drawn
 388                         <<", m_draw_control.blocks_would_have_drawn="
 389                         <<m_draw_control.blocks_would_have_drawn
 390                         <<std::endl;*/
 391
 392         // Get current viewing range and FPS settings
 393         f32 viewing_range_min = g_settings->getS16("viewing_range_nodes_min");
 394         viewing_range_min = MYMAX(5.0, viewing_range_min);
 395
 396         f32 viewing_range_max = g_settings->getS16("viewing_range_nodes_max");
 397         viewing_range_max = MYMAX(viewing_range_min, viewing_range_max);
 398
 399         // Immediately apply hard limits
 400         if(m_draw_control.wanted_range < viewing_range_min)
 401                 m_draw_control.wanted_range = viewing_range_min;
 402         if(m_draw_control.wanted_range > viewing_range_max)
 403                 m_draw_control.wanted_range = viewing_range_max;
 404
 405         // Just so big a value that everything rendered is visible
 406         // Some more allowance than viewing_range_max * BS because of clouds,
 407         // active objects, etc.
 408         if(viewing_range_max < 200*BS)
 409                 m_cameranode->setFarValue(200 * BS * 10);
 410         else
 411                 m_cameranode->setFarValue(viewing_range_max * BS * 10);
 412
 413         f32 wanted_fps = g_settings->getFloat("wanted_fps");
 414         wanted_fps = MYMAX(wanted_fps, 1.0);
 415         f32 wanted_frametime = 1.0 / wanted_fps;
 416
 417         m_draw_control.wanted_min_range = viewing_range_min;
 418         m_draw_control.wanted_max_blocks = (2.0*m_draw_control.blocks_would_have_drawn)+1;
 419         if (m_draw_control.wanted_max_blocks < 10)
 420                 m_draw_control.wanted_max_blocks = 10;
 421
 422         f32 block_draw_ratio = 1.0;
 423         if (m_draw_control.blocks_would_have_drawn != 0)
 424         {
 425                 block_draw_ratio = (f32)m_draw_control.blocks_drawn
 426                         / (f32)m_draw_control.blocks_would_have_drawn;
 427         }
 428
 429         // Calculate the average frametime in the case that all wanted
 430         // blocks had been drawn
 431         f32 frametime = m_added_frametime / m_added_frames / block_draw_ratio;
 432
 433         m_added_frametime = 0.0;
 434         m_added_frames = 0;
 435
 436         f32 wanted_frametime_change = wanted_frametime - frametime;
 437         //dstream<<"wanted_frametime_change="<<wanted_frametime_change<<std::endl;
 438
 439         // If needed frametime change is small, just return
 440         // This value was 0.4 for many months until 2011-10-18 by c55;
 441         // Let's see how this works out.
 442         if (fabs(wanted_frametime_change) < wanted_frametime*0.33)
 443         {
 444                 //dstream<<"ignoring small wanted_frametime_change"<<std::endl;
 445                 return;
 446         }
 447
 448         f32 range = m_draw_control.wanted_range;
 449         f32 new_range = range;
 450
 451         f32 d_range = range - m_range_old;
 452         f32 d_frametime = frametime - m_frametime_old;
 453         if (d_range != 0)
 454         {
 455                 m_time_per_range = d_frametime / d_range;
 456         }
 457
 458         // The minimum allowed calculated frametime-range derivative:
 459         // Practically this sets the maximum speed of changing the range.
 460         // The lower this value, the higher the maximum changing speed.
 461         // A low value here results in wobbly range (0.001)
 462         // A high value here results in slow changing range (0.0025)
 463         // SUGG: This could be dynamically adjusted so that when
 464         //       the camera is turning, this is lower
 465         //f32 min_time_per_range = 0.0015;
 466         f32 min_time_per_range = 0.0010;
 467         //f32 min_time_per_range = 0.05 / range;
 468         if(m_time_per_range < min_time_per_range)
 469         {
 470                 m_time_per_range = min_time_per_range;
 471                 //dstream<<"m_time_per_range="<<m_time_per_range<<" (min)"<<std::endl;
 472         }
 473         else
 474         {
 475                 //dstream<<"m_time_per_range="<<m_time_per_range<<std::endl;
 476         }
 477
 478         f32 wanted_range_change = wanted_frametime_change / m_time_per_range;
 479         // Dampen the change a bit to kill oscillations
 480         //wanted_range_change *= 0.9;
 481         //wanted_range_change *= 0.75;
 482         wanted_range_change *= 0.5;
 483         //dstream<<"wanted_range_change="<<wanted_range_change<<std::endl;
 484
 485         // If needed range change is very small, just return
 486         if(fabs(wanted_range_change) < 0.001)
 487         {
 488                 //dstream<<"ignoring small wanted_range_change"<<std::endl;
 489                 return;
 490         }
 491
 492         new_range += wanted_range_change;
 493
 494         //f32 new_range_unclamped = new_range;
 495         new_range = MYMAX(new_range, viewing_range_min);
 496         new_range = MYMIN(new_range, viewing_range_max);
 497         /*dstream<<"new_range="<<new_range_unclamped
 498                         <<", clamped to "<<new_range<<std::endl;*/
 499
 500         m_draw_control.wanted_range = new_range;
 501
 502         m_range_old = new_range;
 503         m_frametime_old = frametime;
 504 }
 505
 506 void Camera::setDigging(s32 button)
 507 {
 508         if (m_digging_button == -1)
 509                 m_digging_button = button;
 510 }
 511
 512 void Camera::wield(const ItemStack &item)
 513 {
 514         IItemDefManager *idef = m_gamedef->idef();
 515         scene::IMesh *wield_mesh = item.getDefinition(idef).wield_mesh;
 516         if(wield_mesh)
 517         {
 518                 m_wieldnode->setMesh(wield_mesh);
 519                 m_wieldnode->setVisible(true);
 520         }
 521         else
 522         {
 523                 m_wieldnode->setVisible(false);
 524         }
 525 }
 526
 527 void Camera::drawWieldedTool()
 528 {
 529         // Set vertex colors of wield mesh according to light level
 530         u8 li = decode_light(m_wieldlight);
 531         video::SColor color(255,li,li,li);
 532         setMeshColor(m_wieldnode->getMesh(), color);
 533
 534         // Clear Z buffer
 535         m_wieldmgr->getVideoDriver()->clearZBuffer();
 536
 537         // Draw the wielded node (in a separate scene manager)
 538         scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
 539         cam->setAspectRatio(m_cameranode->getAspectRatio());
 540         cam->setFOV(72.0*PI/180.0);
 541         cam->setNearValue(0.1);
 542         cam->setFarValue(100);
 543         m_wieldmgr->drawAll();
 544 }