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 Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser 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 #include "util/numeric.h"
  37
  38 Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
  39                 IGameDef *gamedef):
  40         m_smgr(smgr),
  41         m_playernode(NULL),
  42         m_headnode(NULL),
  43         m_cameranode(NULL),
  44
  45         m_wieldmgr(NULL),
  46         m_wieldnode(NULL),
  47         m_wieldlight(0),
  48
  49         m_draw_control(draw_control),
  50         m_gamedef(gamedef),
  51
  52         m_camera_position(0,0,0),
  53         m_camera_direction(0,0,0),
  54
  55         m_aspect(1.0),
  56         m_fov_x(1.0),
  57         m_fov_y(1.0),
  58
  59         m_added_frametime(0),
  60         m_added_frames(0),
  61         m_range_old(0),
  62         m_frametime_old(0),
  63         m_frametime_counter(0),
  64         m_time_per_range(30. / 50), // a sane default of 30ms per 50 nodes of range
  65
  66         m_view_bobbing_anim(0),
  67         m_view_bobbing_state(0),
  68         m_view_bobbing_speed(0),
  69
  70         m_digging_anim(0),
  71         m_digging_button(-1)
  72 {
  73         //dstream<<__FUNCTION_NAME<<std::endl;
  74
  75         // note: making the camera node a child of the player node
  76         // would lead to unexpected behaviour, so we don't do that.
  77         m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
  78         m_headnode = smgr->addEmptySceneNode(m_playernode);
  79         m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
  80         m_cameranode->bindTargetAndRotation(true);
  81
  82         // This needs to be in its own scene manager. It is drawn after
  83         // all other 3D scene nodes and before the GUI.
  84         m_wieldmgr = smgr->createNewSceneManager();
  85         m_wieldmgr->addCameraSceneNode();
  86         m_wieldnode = m_wieldmgr->addMeshSceneNode(createCubeMesh(v3f(1,1,1)), NULL);  // need a dummy mesh
  87 }
  88
  89 Camera::~Camera()
  90 {
  91         m_wieldnode->setMesh(NULL);
  92         m_wieldmgr->drop();
  93 }
  94
  95 bool Camera::successfullyCreated(std::wstring& error_message)
  96 {
  97         if (m_playernode == NULL)
  98         {
  99                 error_message = L"Failed to create the player scene node";
 100                 return false;
 101         }
 102         if (m_headnode == NULL)
 103         {
 104                 error_message = L"Failed to create the head scene node";
 105                 return false;
 106         }
 107         if (m_cameranode == NULL)
 108         {
 109                 error_message = L"Failed to create the camera scene node";
 110                 return false;
 111         }
 112         if (m_wieldmgr == NULL)
 113         {
 114                 error_message = L"Failed to create the wielded item scene manager";
 115                 return false;
 116         }
 117         if (m_wieldnode == NULL)
 118         {
 119                 error_message = L"Failed to create the wielded item scene node";
 120                 return false;
 121         }
 122         return true;
 123 }
 124
 125 // Returns the fractional part of x
 126 inline f32 my_modf(f32 x)
 127 {
 128         double dummy;
 129         return modf(x, &dummy);
 130 }
 131
 132 void Camera::step(f32 dtime)
 133 {
 134         if (m_view_bobbing_state != 0)
 135         {
 136                 //f32 offset = dtime * m_view_bobbing_speed * 0.035;
 137                 f32 offset = dtime * m_view_bobbing_speed * 0.030;
 138                 if (m_view_bobbing_state == 2)
 139                 {
 140 #if 0
 141                         // Animation is getting turned off
 142                         if (m_view_bobbing_anim < 0.5)
 143                                 m_view_bobbing_anim -= offset;
 144                         else
 145                                 m_view_bobbing_anim += offset;
 146                         if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1)
 147                         {
 148                                 m_view_bobbing_anim = 0;
 149                                 m_view_bobbing_state = 0;
 150                         }
 151 #endif
 152 #if 1
 153                         // Animation is getting turned off
 154                         if(m_view_bobbing_anim < 0.25){
 155                                 m_view_bobbing_anim -= offset;
 156                         } else if(m_view_bobbing_anim > 0.75){
 157                                 m_view_bobbing_anim += offset;
 158                         } if(m_view_bobbing_anim < 0.5){
 159                                 m_view_bobbing_anim += offset;
 160                                 if(m_view_bobbing_anim > 0.5)
 161                                         m_view_bobbing_anim = 0.5;
 162                         } else {
 163                                 m_view_bobbing_anim -= offset;
 164                                 if(m_view_bobbing_anim < 0.5)
 165                                         m_view_bobbing_anim = 0.5;
 166                         }
 167                         if(m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
 168                                         fabs(m_view_bobbing_anim - 0.5) < 0.01)
 169                         {
 170                                 m_view_bobbing_anim = 0;
 171                                 m_view_bobbing_state = 0;
 172                         }
 173 #endif
 174                 }
 175                 else
 176                 {
 177                         float was = m_view_bobbing_anim;
 178                         m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
 179                         bool step = (was == 0 ||
 180                                         (was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
 181                                         (was > 0.5f && m_view_bobbing_anim <= 0.5f));
 182                         if(step){
 183                                 MtEvent *e = new SimpleTriggerEvent("ViewBobbingStep");
 184                                 m_gamedef->event()->put(e);
 185                         }
 186                 }
 187         }
 188
 189         if (m_digging_button != -1)
 190         {
 191                 f32 offset = dtime * 3.5;
 192                 float m_digging_anim_was = m_digging_anim;
 193                 m_digging_anim += offset;
 194                 if (m_digging_anim >= 1)
 195                 {
 196                         m_digging_anim = 0;
 197                         m_digging_button = -1;
 198                 }
 199                 float lim = 0.15;
 200                 if(m_digging_anim_was < lim && m_digging_anim >= lim)
 201                 {
 202                         if(m_digging_button == 0){
 203                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchLeft");
 204                                 m_gamedef->event()->put(e);
 205                         } else if(m_digging_button == 1){
 206                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchRight");
 207                                 m_gamedef->event()->put(e);
 208                         }
 209                 }
 210         }
 211 }
 212
 213 void Camera::update(LocalPlayer* player, f32 frametime, v2u32 screensize,
 214                 f32 tool_reload_ratio)
 215 {
 216         // Set player node transformation
 217         m_playernode->setPosition(player->getPosition());
 218         m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
 219         m_playernode->updateAbsolutePosition();
 220
 221         // Set head node transformation
 222         m_headnode->setPosition(player->getEyeOffset());
 223         m_headnode->setRotation(v3f(player->getPitch(), 0, 0));
 224         m_headnode->updateAbsolutePosition();
 225
 226         // Compute relative camera position and target
 227         v3f rel_cam_pos = v3f(0,0,0);
 228         v3f rel_cam_target = v3f(0,0,1);
 229         v3f rel_cam_up = v3f(0,1,0);
 230
 231         if (m_view_bobbing_anim != 0)
 232         {
 233                 f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
 234                 f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;
 235
 236                 #if 1
 237                 f32 bobknob = 1.2;
 238                 f32 bobtmp = sin(pow(bobfrac, bobknob) * M_PI);
 239                 //f32 bobtmp2 = cos(pow(bobfrac, bobknob) * M_PI);
 240
 241                 v3f bobvec = v3f(
 242                         0.3 * bobdir * sin(bobfrac * M_PI),
 243                         -0.28 * bobtmp * bobtmp,
 244                         0.);
 245
 246                 //rel_cam_pos += 0.2 * bobvec;
 247                 //rel_cam_target += 0.03 * bobvec;
 248                 //rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * M_PI);
 249                 float f = 1.0;
 250                 f *= g_settings->getFloat("view_bobbing_amount");
 251                 rel_cam_pos += bobvec * f;
 252                 //rel_cam_target += 0.995 * bobvec * f;
 253                 rel_cam_target += bobvec * f;
 254                 rel_cam_target.Z -= 0.005 * bobvec.Z * f;
 255                 //rel_cam_target.X -= 0.005 * bobvec.X * f;
 256                 //rel_cam_target.Y -= 0.005 * bobvec.Y * f;
 257                 rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * M_PI * f);
 258                 #else
 259                 f32 angle_deg = 1 * bobdir * sin(bobfrac * M_PI);
 260                 f32 angle_rad = angle_deg * M_PI / 180;
 261                 f32 r = 0.05;
 262                 v3f off = v3f(
 263                         r * sin(angle_rad),
 264                         r * (cos(angle_rad) - 1),
 265                         0);
 266                 rel_cam_pos += off;
 267                 //rel_cam_target += off;
 268                 rel_cam_up.rotateXYBy(angle_deg);
 269                 #endif
 270
 271         }
 272
 273         // Compute absolute camera position and target
 274         m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
 275         m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);
 276
 277         v3f abs_cam_up;
 278         m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 279
 280         // Set camera node transformation
 281         m_cameranode->setPosition(m_camera_position);
 282         m_cameranode->setUpVector(abs_cam_up);
 283         // *100.0 helps in large map coordinates
 284         m_cameranode->setTarget(m_camera_position + 100 * m_camera_direction);
 285
 286         // Get FOV setting
 287         f32 fov_degrees = g_settings->getFloat("fov");
 288         fov_degrees = MYMAX(fov_degrees, 10.0);
 289         fov_degrees = MYMIN(fov_degrees, 170.0);
 290
 291         // FOV and aspect ratio
 292         m_aspect = (f32)screensize.X / (f32) screensize.Y;
 293         m_fov_y = fov_degrees * M_PI / 180.0;
 294         // Increase vertical FOV on lower aspect ratios (<16:10)
 295         m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
 296         // WTF is this? It can't be right
 297         m_fov_x = 2 * atan(0.5 * m_aspect * tan(m_fov_y));
 298         m_cameranode->setAspectRatio(m_aspect);
 299         m_cameranode->setFOV(m_fov_y);
 300
 301         // Position the wielded item
 302         //v3f wield_position = v3f(45, -35, 65);
 303         v3f wield_position = v3f(55, -35, 65);
 304         //v3f wield_rotation = v3f(-100, 120, -100);
 305         v3f wield_rotation = v3f(-100, 120, -100);
 306         if(m_digging_anim < 0.05 || m_digging_anim > 0.5){
 307                 f32 frac = 1.0;
 308                 if(m_digging_anim > 0.5)
 309                         frac = 2.0 * (m_digging_anim - 0.5);
 310                 // This value starts from 1 and settles to 0
 311                 f32 ratiothing = pow((1.0f - tool_reload_ratio), 0.5f);
 312                 //f32 ratiothing2 = pow(ratiothing, 0.5f);
 313                 f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
 314                 wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
 315                 //wield_position.Z += frac * 5.0 * ratiothing2;
 316                 wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
 317                 wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
 318                 //wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
 319                 //wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
 320         }
 321         if (m_digging_button != -1)
 322         {
 323                 f32 digfrac = m_digging_anim;
 324                 wield_position.X -= 30 * sin(pow(digfrac, 0.8f) * M_PI);
 325                 wield_position.Y += 15 * sin(digfrac * 2 * M_PI);
 326                 wield_position.Z += 5 * digfrac;
 327
 328                 // Euler angles are PURE EVIL, so why not use quaternions?
 329                 core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
 330                 core::quaternion quat_end(v3f(90, -10, -130) * core::DEGTORAD);
 331                 core::quaternion quat_slerp;
 332                 quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * M_PI));
 333                 quat_slerp.toEuler(wield_rotation);
 334                 wield_rotation *= core::RADTODEG;
 335         }
 336         else {
 337                 f32 bobfrac = my_modf(m_view_bobbing_anim);
 338                 wield_position.X -= sin(bobfrac*M_PI*2.0) * 3.0;
 339                 wield_position.Y += sin(my_modf(bobfrac*2.0)*M_PI) * 3.0;
 340         }
 341         m_wieldnode->setPosition(wield_position);
 342         m_wieldnode->setRotation(wield_rotation);
 343         m_wieldlight = player->light;
 344
 345         // Render distance feedback loop
 346         updateViewingRange(frametime);
 347
 348         // If the player seems to be walking on solid ground,
 349         // view bobbing is enabled and free_move is off,
 350         // start (or continue) the view bobbing animation.
 351         v3f speed = player->getSpeed();
 352         if ((hypot(speed.X, speed.Z) > BS) &&
 353                 (player->touching_ground) &&
 354                 (g_settings->getBool("view_bobbing") == true) &&
 355                 (g_settings->getBool("free_move") == false ||
 356                                 !m_gamedef->checkLocalPrivilege("fly")))
 357         {
 358                 // Start animation
 359                 m_view_bobbing_state = 1;
 360                 m_view_bobbing_speed = MYMIN(speed.getLength(), 40);
 361         }
 362         else if (m_view_bobbing_state == 1)
 363         {
 364                 // Stop animation
 365                 m_view_bobbing_state = 2;
 366                 m_view_bobbing_speed = 60;
 367         }
 368 }
 369
 370 void Camera::updateViewingRange(f32 frametime_in)
 371 {
 372         if (m_draw_control.range_all)
 373                 return;
 374
 375         m_added_frametime += frametime_in;
 376         m_added_frames += 1;
 377
 378         // Actually this counter kind of sucks because frametime is busytime
 379         m_frametime_counter -= frametime_in;
 380         if (m_frametime_counter > 0)
 381                 return;
 382         m_frametime_counter = 0.2;
 383
 384         /*dstream<<__FUNCTION_NAME
 385                         <<": Collected "<<m_added_frames<<" frames, total of "
 386                         <<m_added_frametime<<"s."<<std::endl;
 387
 388         dstream<<"m_draw_control.blocks_drawn="
 389                         <<m_draw_control.blocks_drawn
 390                         <<", m_draw_control.blocks_would_have_drawn="
 391                         <<m_draw_control.blocks_would_have_drawn
 392                         <<std::endl;*/
 393
 394         // Get current viewing range and FPS settings
 395         f32 viewing_range_min = g_settings->getS16("viewing_range_nodes_min");
 396         viewing_range_min = MYMAX(5.0, viewing_range_min);
 397
 398         f32 viewing_range_max = g_settings->getS16("viewing_range_nodes_max");
 399         viewing_range_max = MYMAX(viewing_range_min, viewing_range_max);
 400
 401         // Immediately apply hard limits
 402         if(m_draw_control.wanted_range < viewing_range_min)
 403                 m_draw_control.wanted_range = viewing_range_min;
 404         if(m_draw_control.wanted_range > viewing_range_max)
 405                 m_draw_control.wanted_range = viewing_range_max;
 406
 407         // Just so big a value that everything rendered is visible
 408         // Some more allowance than viewing_range_max * BS because of clouds,
 409         // active objects, etc.
 410         if(viewing_range_max < 200*BS)
 411                 m_cameranode->setFarValue(200 * BS * 10);
 412         else
 413                 m_cameranode->setFarValue(viewing_range_max * BS * 10);
 414
 415         f32 wanted_fps = g_settings->getFloat("wanted_fps");
 416         wanted_fps = MYMAX(wanted_fps, 1.0);
 417         f32 wanted_frametime = 1.0 / wanted_fps;
 418
 419         m_draw_control.wanted_min_range = viewing_range_min;
 420         m_draw_control.wanted_max_blocks = (2.0*m_draw_control.blocks_would_have_drawn)+1;
 421         if (m_draw_control.wanted_max_blocks < 10)
 422                 m_draw_control.wanted_max_blocks = 10;
 423
 424         f32 block_draw_ratio = 1.0;
 425         if (m_draw_control.blocks_would_have_drawn != 0)
 426         {
 427                 block_draw_ratio = (f32)m_draw_control.blocks_drawn
 428                         / (f32)m_draw_control.blocks_would_have_drawn;
 429         }
 430
 431         // Calculate the average frametime in the case that all wanted
 432         // blocks had been drawn
 433         f32 frametime = m_added_frametime / m_added_frames / block_draw_ratio;
 434
 435         m_added_frametime = 0.0;
 436         m_added_frames = 0;
 437
 438         f32 wanted_frametime_change = wanted_frametime - frametime;
 439         //dstream<<"wanted_frametime_change="<<wanted_frametime_change<<std::endl;
 440
 441         // If needed frametime change is small, just return
 442         // This value was 0.4 for many months until 2011-10-18 by c55;
 443         // Let's see how this works out.
 444         if (fabs(wanted_frametime_change) < wanted_frametime*0.33)
 445         {
 446                 //dstream<<"ignoring small wanted_frametime_change"<<std::endl;
 447                 return;
 448         }
 449
 450         f32 range = m_draw_control.wanted_range;
 451         f32 new_range = range;
 452
 453         f32 d_range = range - m_range_old;
 454         f32 d_frametime = frametime - m_frametime_old;
 455         if (d_range != 0)
 456         {
 457                 m_time_per_range = d_frametime / d_range;
 458         }
 459
 460         // The minimum allowed calculated frametime-range derivative:
 461         // Practically this sets the maximum speed of changing the range.
 462         // The lower this value, the higher the maximum changing speed.
 463         // A low value here results in wobbly range (0.001)
 464         // A high value here results in slow changing range (0.0025)
 465         // SUGG: This could be dynamically adjusted so that when
 466         //       the camera is turning, this is lower
 467         //f32 min_time_per_range = 0.0015;
 468         f32 min_time_per_range = 0.0010;
 469         //f32 min_time_per_range = 0.05 / range;
 470         if(m_time_per_range < min_time_per_range)
 471         {
 472                 m_time_per_range = min_time_per_range;
 473                 //dstream<<"m_time_per_range="<<m_time_per_range<<" (min)"<<std::endl;
 474         }
 475         else
 476         {
 477                 //dstream<<"m_time_per_range="<<m_time_per_range<<std::endl;
 478         }
 479
 480         f32 wanted_range_change = wanted_frametime_change / m_time_per_range;
 481         // Dampen the change a bit to kill oscillations
 482         //wanted_range_change *= 0.9;
 483         //wanted_range_change *= 0.75;
 484         wanted_range_change *= 0.5;
 485         //dstream<<"wanted_range_change="<<wanted_range_change<<std::endl;
 486
 487         // If needed range change is very small, just return
 488         if(fabs(wanted_range_change) < 0.001)
 489         {
 490                 //dstream<<"ignoring small wanted_range_change"<<std::endl;
 491                 return;
 492         }
 493
 494         new_range += wanted_range_change;
 495
 496         //f32 new_range_unclamped = new_range;
 497         new_range = MYMAX(new_range, viewing_range_min);
 498         new_range = MYMIN(new_range, viewing_range_max);
 499         /*dstream<<"new_range="<<new_range_unclamped
 500                         <<", clamped to "<<new_range<<std::endl;*/
 501
 502         m_draw_control.wanted_range = new_range;
 503
 504         m_range_old = new_range;
 505         m_frametime_old = frametime;
 506 }
 507
 508 void Camera::setDigging(s32 button)
 509 {
 510         if (m_digging_button == -1)
 511                 m_digging_button = button;
 512 }
 513
 514 void Camera::wield(const ItemStack &item)
 515 {
 516         IItemDefManager *idef = m_gamedef->idef();
 517         scene::IMesh *wield_mesh = item.getDefinition(idef).wield_mesh;
 518         if(wield_mesh)
 519         {
 520                 m_wieldnode->setMesh(wield_mesh);
 521                 m_wieldnode->setVisible(true);
 522         }
 523         else
 524         {
 525                 m_wieldnode->setVisible(false);
 526         }
 527 }
 528
 529 void Camera::drawWieldedTool()
 530 {
 531         // Set vertex colors of wield mesh according to light level
 532         u8 li = decode_light(m_wieldlight);
 533         video::SColor color(255,li,li,li);
 534         setMeshColor(m_wieldnode->getMesh(), color);
 535
 536         // Clear Z buffer
 537         m_wieldmgr->getVideoDriver()->clearZBuffer();
 538
 539         // Draw the wielded node (in a separate scene manager)
 540         scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
 541         cam->setAspectRatio(m_cameranode->getAspectRatio());
 542         cam->setFOV(72.0*M_PI/180.0);
 543         cam->setNearValue(0.1);
 544         cam->setFarValue(100);
 545         m_wieldmgr->drawAll();
 546 }