src/camera.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 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 "map.h"
  24 #include "clientmap.h"     // MapDrawControl
  25 #include "player.h"
  26 #include <cmath>
  27 #include "settings.h"
  28 #include "wieldmesh.h"
  29 #include "noise.h"         // easeCurve
  30 #include "gamedef.h"
  31 #include "sound.h"
  32 #include "event.h"
  33 #include "profiler.h"
  34 #include "util/numeric.h"
  35 #include "util/mathconstants.h"
  36 #include "constants.h"
  37
  38 #define CAMERA_OFFSET_STEP 200
  39
  40 #include "nodedef.h"
  41
  42 Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
  43                 IGameDef *gamedef):
  44         m_playernode(NULL),
  45         m_headnode(NULL),
  46         m_cameranode(NULL),
  47
  48         m_wieldmgr(NULL),
  49         m_wieldnode(NULL),
  50
  51         m_draw_control(draw_control),
  52         m_gamedef(gamedef),
  53
  54         m_camera_position(0,0,0),
  55         m_camera_direction(0,0,0),
  56         m_camera_offset(0,0,0),
  57
  58         m_aspect(1.0),
  59         m_fov_x(1.0),
  60         m_fov_y(1.0),
  61
  62         m_added_busytime(0),
  63         m_added_frames(0),
  64         m_range_old(0),
  65         m_busytime_old(0),
  66         m_frametime_counter(0),
  67         m_time_per_range(30. / 50), // a sane default of 30ms per 50 nodes of range
  68
  69         m_view_bobbing_anim(0),
  70         m_view_bobbing_state(0),
  71         m_view_bobbing_speed(0),
  72         m_view_bobbing_fall(0),
  73
  74         m_digging_anim(0),
  75         m_digging_button(-1),
  76
  77         m_wield_change_timer(0.125),
  78         m_wield_item_next(),
  79
  80         m_camera_mode(CAMERA_MODE_FIRST)
  81 {
  82         //dstream<<__FUNCTION_NAME<<std::endl;
  83
  84         // note: making the camera node a child of the player node
  85         // would lead to unexpected behaviour, so we don't do that.
  86         m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
  87         m_headnode = smgr->addEmptySceneNode(m_playernode);
  88         m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
  89         m_cameranode->bindTargetAndRotation(true);
  90
  91         // This needs to be in its own scene manager. It is drawn after
  92         // all other 3D scene nodes and before the GUI.
  93         m_wieldmgr = smgr->createNewSceneManager();
  94         m_wieldmgr->addCameraSceneNode();
  95         m_wieldnode = new WieldMeshSceneNode(m_wieldmgr->getRootSceneNode(), m_wieldmgr, -1, true);
  96         m_wieldnode->setItem(ItemStack(), m_gamedef);
  97         m_wieldnode->drop(); // m_wieldmgr grabbed it
  98         m_wieldlightnode = m_wieldmgr->addLightSceneNode(NULL, v3f(0.0, 50.0, 0.0));
  99
 100         /* TODO: Add a callback function so these can be updated when a setting
 101          *       changes.  At this point in time it doesn't matter (e.g. /set
 102          *       is documented to change server settings only)
 103          *
 104          * TODO: Local caching of settings is not optimal and should at some stage
 105          *       be updated to use a global settings object for getting thse values
 106          *       (as opposed to the this local caching). This can be addressed in
 107          *       a later release.
 108          */
 109         m_cache_fall_bobbing_amount = g_settings->getFloat("fall_bobbing_amount");
 110         m_cache_view_bobbing_amount = g_settings->getFloat("view_bobbing_amount");
 111         m_cache_wanted_fps          = g_settings->getFloat("wanted_fps");
 112         m_cache_fov                 = g_settings->getFloat("fov");
 113         m_cache_view_bobbing        = g_settings->getBool("view_bobbing");
 114 }
 115
 116 Camera::~Camera()
 117 {
 118         m_wieldmgr->drop();
 119 }
 120
 121 bool Camera::successfullyCreated(std::string &error_message)
 122 {
 123         if (!m_playernode) {
 124                 error_message = "Failed to create the player scene node";
 125         } else if (!m_headnode) {
 126                 error_message = "Failed to create the head scene node";
 127         } else if (!m_cameranode) {
 128                 error_message = "Failed to create the camera scene node";
 129         } else if (!m_wieldmgr) {
 130                 error_message = "Failed to create the wielded item scene manager";
 131         } else if (!m_wieldnode) {
 132                 error_message = "Failed to create the wielded item scene node";
 133         } else {
 134                 error_message.clear();
 135         }
 136         return error_message.empty();
 137 }
 138
 139 // Returns the fractional part of x
 140 inline f32 my_modf(f32 x)
 141 {
 142         double dummy;
 143         return modf(x, &dummy);
 144 }
 145
 146 void Camera::step(f32 dtime)
 147 {
 148         if(m_view_bobbing_fall > 0)
 149         {
 150                 m_view_bobbing_fall -= 3 * dtime;
 151                 if(m_view_bobbing_fall <= 0)
 152                         m_view_bobbing_fall = -1; // Mark the effect as finished
 153         }
 154
 155         bool was_under_zero = m_wield_change_timer < 0;
 156         m_wield_change_timer = MYMIN(m_wield_change_timer + dtime, 0.125);
 157
 158         if (m_wield_change_timer >= 0 && was_under_zero)
 159                 m_wieldnode->setItem(m_wield_item_next, m_gamedef);
 160
 161         if (m_view_bobbing_state != 0)
 162         {
 163                 //f32 offset = dtime * m_view_bobbing_speed * 0.035;
 164                 f32 offset = dtime * m_view_bobbing_speed * 0.030;
 165                 if (m_view_bobbing_state == 2)
 166                 {
 167 #if 0
 168                         // Animation is getting turned off
 169                         if (m_view_bobbing_anim < 0.5)
 170                                 m_view_bobbing_anim -= offset;
 171                         else
 172                                 m_view_bobbing_anim += offset;
 173                         if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1)
 174                         {
 175                                 m_view_bobbing_anim = 0;
 176                                 m_view_bobbing_state = 0;
 177                         }
 178 #endif
 179 #if 1
 180                         // Animation is getting turned off
 181                         if(m_view_bobbing_anim < 0.25)
 182                         {
 183                                 m_view_bobbing_anim -= offset;
 184                         } else if(m_view_bobbing_anim > 0.75) {
 185                                 m_view_bobbing_anim += offset;
 186                         }
 187                         if(m_view_bobbing_anim < 0.5)
 188                         {
 189                                 m_view_bobbing_anim += offset;
 190                                 if(m_view_bobbing_anim > 0.5)
 191                                         m_view_bobbing_anim = 0.5;
 192                         } else {
 193                                 m_view_bobbing_anim -= offset;
 194                                 if(m_view_bobbing_anim < 0.5)
 195                                         m_view_bobbing_anim = 0.5;
 196                         }
 197                         if(m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
 198                                         fabs(m_view_bobbing_anim - 0.5) < 0.01)
 199                         {
 200                                 m_view_bobbing_anim = 0;
 201                                 m_view_bobbing_state = 0;
 202                         }
 203 #endif
 204                 }
 205                 else
 206                 {
 207                         float was = m_view_bobbing_anim;
 208                         m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
 209                         bool step = (was == 0 ||
 210                                         (was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
 211                                         (was > 0.5f && m_view_bobbing_anim <= 0.5f));
 212                         if(step)
 213                         {
 214                                 MtEvent *e = new SimpleTriggerEvent("ViewBobbingStep");
 215                                 m_gamedef->event()->put(e);
 216                         }
 217                 }
 218         }
 219
 220         if (m_digging_button != -1)
 221         {
 222                 f32 offset = dtime * 3.5;
 223                 float m_digging_anim_was = m_digging_anim;
 224                 m_digging_anim += offset;
 225                 if (m_digging_anim >= 1)
 226                 {
 227                         m_digging_anim = 0;
 228                         m_digging_button = -1;
 229                 }
 230                 float lim = 0.15;
 231                 if(m_digging_anim_was < lim && m_digging_anim >= lim)
 232                 {
 233                         if(m_digging_button == 0)
 234                         {
 235                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchLeft");
 236                                 m_gamedef->event()->put(e);
 237                         } else if(m_digging_button == 1) {
 238                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchRight");
 239                                 m_gamedef->event()->put(e);
 240                         }
 241                 }
 242         }
 243 }
 244
 245 void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
 246                 f32 tool_reload_ratio, ClientEnvironment &c_env)
 247 {
 248         // Get player position
 249         // Smooth the movement when walking up stairs
 250         v3f old_player_position = m_playernode->getPosition();
 251         v3f player_position = player->getPosition();
 252         if (player->isAttached && player->parent)
 253                 player_position = player->parent->getPosition();
 254         //if(player->touching_ground && player_position.Y > old_player_position.Y)
 255         if(player->touching_ground &&
 256                         player_position.Y > old_player_position.Y)
 257         {
 258                 f32 oldy = old_player_position.Y;
 259                 f32 newy = player_position.Y;
 260                 f32 t = exp(-23*frametime);
 261                 player_position.Y = oldy * t + newy * (1-t);
 262         }
 263
 264         // Set player node transformation
 265         m_playernode->setPosition(player_position);
 266         m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
 267         m_playernode->updateAbsolutePosition();
 268
 269         // Get camera tilt timer (hurt animation)
 270         float cameratilt = fabs(fabs(player->hurt_tilt_timer-0.75)-0.75);
 271
 272         // Fall bobbing animation
 273         float fall_bobbing = 0;
 274         if(player->camera_impact >= 1 && m_camera_mode < CAMERA_MODE_THIRD)
 275         {
 276                 if(m_view_bobbing_fall == -1) // Effect took place and has finished
 277                         player->camera_impact = m_view_bobbing_fall = 0;
 278                 else if(m_view_bobbing_fall == 0) // Initialize effect
 279                         m_view_bobbing_fall = 1;
 280
 281                 // Convert 0 -> 1 to 0 -> 1 -> 0
 282                 fall_bobbing = m_view_bobbing_fall < 0.5 ? m_view_bobbing_fall * 2 : -(m_view_bobbing_fall - 0.5) * 2 + 1;
 283                 // Smoothen and invert the above
 284                 fall_bobbing = sin(fall_bobbing * 0.5 * M_PI) * -1;
 285                 // Amplify according to the intensity of the impact
 286                 fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;
 287
 288                 fall_bobbing *= m_cache_fall_bobbing_amount;
 289         }
 290
 291         // Calculate players eye offset for different camera modes
 292         v3f PlayerEyeOffset = player->getEyeOffset();
 293         if (m_camera_mode == CAMERA_MODE_FIRST)
 294                 PlayerEyeOffset += player->eye_offset_first;
 295         else
 296                 PlayerEyeOffset += player->eye_offset_third;
 297
 298         // Set head node transformation
 299         m_headnode->setPosition(PlayerEyeOffset+v3f(0,cameratilt*-player->hurt_tilt_strength+fall_bobbing,0));
 300         m_headnode->setRotation(v3f(player->getPitch(), 0, cameratilt*player->hurt_tilt_strength));
 301         m_headnode->updateAbsolutePosition();
 302
 303         // Compute relative camera position and target
 304         v3f rel_cam_pos = v3f(0,0,0);
 305         v3f rel_cam_target = v3f(0,0,1);
 306         v3f rel_cam_up = v3f(0,1,0);
 307
 308         if (m_view_bobbing_anim != 0 && m_camera_mode < CAMERA_MODE_THIRD)
 309         {
 310                 f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
 311                 f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;
 312
 313                 #if 1
 314                 f32 bobknob = 1.2;
 315                 f32 bobtmp = sin(pow(bobfrac, bobknob) * M_PI);
 316                 //f32 bobtmp2 = cos(pow(bobfrac, bobknob) * M_PI);
 317
 318                 v3f bobvec = v3f(
 319                         0.3 * bobdir * sin(bobfrac * M_PI),
 320                         -0.28 * bobtmp * bobtmp,
 321                         0.);
 322
 323                 //rel_cam_pos += 0.2 * bobvec;
 324                 //rel_cam_target += 0.03 * bobvec;
 325                 //rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * M_PI);
 326                 float f = 1.0;
 327                 f *= m_cache_view_bobbing_amount;
 328                 rel_cam_pos += bobvec * f;
 329                 //rel_cam_target += 0.995 * bobvec * f;
 330                 rel_cam_target += bobvec * f;
 331                 rel_cam_target.Z -= 0.005 * bobvec.Z * f;
 332                 //rel_cam_target.X -= 0.005 * bobvec.X * f;
 333                 //rel_cam_target.Y -= 0.005 * bobvec.Y * f;
 334                 rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * M_PI * f);
 335                 #else
 336                 f32 angle_deg = 1 * bobdir * sin(bobfrac * M_PI);
 337                 f32 angle_rad = angle_deg * M_PI / 180;
 338                 f32 r = 0.05;
 339                 v3f off = v3f(
 340                         r * sin(angle_rad),
 341                         r * (cos(angle_rad) - 1),
 342                         0);
 343                 rel_cam_pos += off;
 344                 //rel_cam_target += off;
 345                 rel_cam_up.rotateXYBy(angle_deg);
 346                 #endif
 347
 348         }
 349
 350         // Compute absolute camera position and target
 351         m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
 352         m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);
 353
 354         v3f abs_cam_up;
 355         m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 356
 357         // Seperate camera position for calculation
 358         v3f my_cp = m_camera_position;
 359
 360         // Reposition the camera for third person view
 361         if (m_camera_mode > CAMERA_MODE_FIRST)
 362         {
 363                 if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 364                         m_camera_direction *= -1;
 365
 366                 my_cp.Y += 2;
 367
 368                 // Calculate new position
 369                 bool abort = false;
 370                 for (int i = BS; i <= BS*2.75; i++)
 371                 {
 372                         my_cp.X = m_camera_position.X + m_camera_direction.X*-i;
 373                         my_cp.Z = m_camera_position.Z + m_camera_direction.Z*-i;
 374                         if (i > 12)
 375                                 my_cp.Y = m_camera_position.Y + (m_camera_direction.Y*-i);
 376
 377                         // Prevent camera positioned inside nodes
 378                         INodeDefManager *nodemgr = m_gamedef->ndef();
 379                         MapNode n = c_env.getClientMap().getNodeNoEx(floatToInt(my_cp, BS));
 380                         const ContentFeatures& features = nodemgr->get(n);
 381                         if(features.walkable)
 382                         {
 383                                 my_cp.X += m_camera_direction.X*-1*-BS/2;
 384                                 my_cp.Z += m_camera_direction.Z*-1*-BS/2;
 385                                 my_cp.Y += m_camera_direction.Y*-1*-BS/2;
 386                                 abort = true;
 387                                 break;
 388                         }
 389                 }
 390
 391                 // If node blocks camera position don't move y to heigh
 392                 if (abort && my_cp.Y > player_position.Y+BS*2)
 393                         my_cp.Y = player_position.Y+BS*2;
 394         }
 395
 396         // Update offset if too far away from the center of the map
 397         m_camera_offset.X += CAMERA_OFFSET_STEP*
 398                         (((s16)(my_cp.X/BS) - m_camera_offset.X)/CAMERA_OFFSET_STEP);
 399         m_camera_offset.Y += CAMERA_OFFSET_STEP*
 400                         (((s16)(my_cp.Y/BS) - m_camera_offset.Y)/CAMERA_OFFSET_STEP);
 401         m_camera_offset.Z += CAMERA_OFFSET_STEP*
 402                         (((s16)(my_cp.Z/BS) - m_camera_offset.Z)/CAMERA_OFFSET_STEP);
 403
 404         // Set camera node transformation
 405         m_cameranode->setPosition(my_cp-intToFloat(m_camera_offset, BS));
 406         m_cameranode->setUpVector(abs_cam_up);
 407         // *100.0 helps in large map coordinates
 408         m_cameranode->setTarget(my_cp-intToFloat(m_camera_offset, BS) + 100 * m_camera_direction);
 409
 410         // update the camera position in front-view mode to render blocks behind player
 411         if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 412                 m_camera_position = my_cp;
 413
 414         // Get FOV setting
 415         f32 fov_degrees = m_cache_fov;
 416         fov_degrees = MYMAX(fov_degrees, 10.0);
 417         fov_degrees = MYMIN(fov_degrees, 170.0);
 418
 419         // FOV and aspect ratio
 420         m_aspect = (f32) porting::getWindowSize().X / (f32) porting::getWindowSize().Y;
 421         m_fov_y = fov_degrees * M_PI / 180.0;
 422         // Increase vertical FOV on lower aspect ratios (<16:10)
 423         m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
 424         m_fov_x = 2 * atan(m_aspect * tan(0.5 * m_fov_y));
 425         m_cameranode->setAspectRatio(m_aspect);
 426         m_cameranode->setFOV(m_fov_y);
 427
 428         // Position the wielded item
 429         //v3f wield_position = v3f(45, -35, 65);
 430         v3f wield_position = v3f(55, -35, 65);
 431         //v3f wield_rotation = v3f(-100, 120, -100);
 432         v3f wield_rotation = v3f(-100, 120, -100);
 433         wield_position.Y += fabs(m_wield_change_timer)*320 - 40;
 434         if(m_digging_anim < 0.05 || m_digging_anim > 0.5)
 435         {
 436                 f32 frac = 1.0;
 437                 if(m_digging_anim > 0.5)
 438                         frac = 2.0 * (m_digging_anim - 0.5);
 439                 // This value starts from 1 and settles to 0
 440                 f32 ratiothing = pow((1.0f - tool_reload_ratio), 0.5f);
 441                 //f32 ratiothing2 = pow(ratiothing, 0.5f);
 442                 f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
 443                 wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
 444                 //wield_position.Z += frac * 5.0 * ratiothing2;
 445                 wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
 446                 wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
 447                 //wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
 448                 //wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
 449         }
 450         if (m_digging_button != -1)
 451         {
 452                 f32 digfrac = m_digging_anim;
 453                 wield_position.X -= 50 * sin(pow(digfrac, 0.8f) * M_PI);
 454                 wield_position.Y += 24 * sin(digfrac * 1.8 * M_PI);
 455                 wield_position.Z += 25 * 0.5;
 456
 457                 // Euler angles are PURE EVIL, so why not use quaternions?
 458                 core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
 459                 core::quaternion quat_end(v3f(80, 30, 100) * core::DEGTORAD);
 460                 core::quaternion quat_slerp;
 461                 quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * M_PI));
 462                 quat_slerp.toEuler(wield_rotation);
 463                 wield_rotation *= core::RADTODEG;
 464         } else {
 465                 f32 bobfrac = my_modf(m_view_bobbing_anim);
 466                 wield_position.X -= sin(bobfrac*M_PI*2.0) * 3.0;
 467                 wield_position.Y += sin(my_modf(bobfrac*2.0)*M_PI) * 3.0;
 468         }
 469         m_wieldnode->setPosition(wield_position);
 470         m_wieldnode->setRotation(wield_rotation);
 471
 472         // Shine light upon the wield mesh
 473         video::SColor black(255,0,0,0);
 474         m_wieldmgr->setAmbientLight(player->light_color.getInterpolated(black, 0.7));
 475         m_wieldlightnode->getLightData().DiffuseColor = player->light_color.getInterpolated(black, 0.3);
 476         m_wieldlightnode->setPosition(v3f(30+5*sin(2*player->getYaw()*M_PI/180), -50, 0));
 477
 478         // Render distance feedback loop
 479         updateViewingRange(frametime, busytime);
 480
 481         // If the player is walking, swimming, or climbing,
 482         // view bobbing is enabled and free_move is off,
 483         // start (or continue) the view bobbing animation.
 484         v3f speed = player->getSpeed();
 485         const bool movement_XZ = hypot(speed.X, speed.Z) > BS;
 486         const bool movement_Y = abs(speed.Y) > BS;
 487
 488         const bool walking = movement_XZ && player->touching_ground;
 489         const bool swimming = (movement_XZ || player->swimming_vertical) && player->in_liquid;
 490         const bool climbing = movement_Y && player->is_climbing;
 491         if ((walking || swimming || climbing) &&
 492                         m_cache_view_bobbing &&
 493                         (!g_settings->getBool("free_move") || !m_gamedef->checkLocalPrivilege("fly")))
 494         {
 495                 // Start animation
 496                 m_view_bobbing_state = 1;
 497                 m_view_bobbing_speed = MYMIN(speed.getLength(), 40);
 498         }
 499         else if (m_view_bobbing_state == 1)
 500         {
 501                 // Stop animation
 502                 m_view_bobbing_state = 2;
 503                 m_view_bobbing_speed = 60;
 504         }
 505 }
 506
 507 void Camera::updateViewingRange(f32 frametime_in, f32 busytime_in)
 508 {
 509         if (m_draw_control.range_all)
 510                 return;
 511
 512         m_added_busytime += busytime_in;
 513         m_added_frames += 1;
 514
 515         m_frametime_counter -= frametime_in;
 516         if (m_frametime_counter > 0)
 517                 return;
 518         m_frametime_counter = 0.2; // Same as ClientMap::updateDrawList interval
 519
 520         /*dstream<<__FUNCTION_NAME
 521                         <<": Collected "<<m_added_frames<<" frames, total of "
 522                         <<m_added_busytime<<"s."<<std::endl;
 523
 524         dstream<<"m_draw_control.blocks_drawn="
 525                         <<m_draw_control.blocks_drawn
 526                         <<", m_draw_control.blocks_would_have_drawn="
 527                         <<m_draw_control.blocks_would_have_drawn
 528                         <<std::endl;*/
 529
 530         // Get current viewing range and FPS settings
 531         f32 viewing_range_min = g_settings->getFloat("viewing_range_nodes_min");
 532         viewing_range_min = MYMAX(15.0, viewing_range_min);
 533
 534         f32 viewing_range_max = g_settings->getFloat("viewing_range_nodes_max");
 535         viewing_range_max = MYMAX(viewing_range_min, viewing_range_max);
 536
 537         // Immediately apply hard limits
 538         if(m_draw_control.wanted_range < viewing_range_min)
 539                 m_draw_control.wanted_range = viewing_range_min;
 540         if(m_draw_control.wanted_range > viewing_range_max)
 541                 m_draw_control.wanted_range = viewing_range_max;
 542
 543         // Just so big a value that everything rendered is visible
 544         // Some more allowance than viewing_range_max * BS because of clouds,
 545         // active objects, etc.
 546         if(viewing_range_max < 200*BS)
 547                 m_cameranode->setFarValue(200 * BS * 10);
 548         else
 549                 m_cameranode->setFarValue(viewing_range_max * BS * 10);
 550
 551         f32 wanted_fps = m_cache_wanted_fps;
 552         wanted_fps = MYMAX(wanted_fps, 1.0);
 553         f32 wanted_frametime = 1.0 / wanted_fps;
 554
 555         m_draw_control.wanted_min_range = viewing_range_min;
 556         m_draw_control.wanted_max_blocks = (2.0*m_draw_control.blocks_would_have_drawn)+1;
 557         if (m_draw_control.wanted_max_blocks < 10)
 558                 m_draw_control.wanted_max_blocks = 10;
 559
 560         f32 block_draw_ratio = 1.0;
 561         if (m_draw_control.blocks_would_have_drawn != 0)
 562         {
 563                 block_draw_ratio = (f32)m_draw_control.blocks_drawn
 564                         / (f32)m_draw_control.blocks_would_have_drawn;
 565         }
 566
 567         // Calculate the average frametime in the case that all wanted
 568         // blocks had been drawn
 569         f32 frametime = m_added_busytime / m_added_frames / block_draw_ratio;
 570
 571         m_added_busytime = 0.0;
 572         m_added_frames = 0;
 573
 574         f32 wanted_frametime_change = wanted_frametime - frametime;
 575         //dstream<<"wanted_frametime_change="<<wanted_frametime_change<<std::endl;
 576         g_profiler->avg("wanted_frametime_change", wanted_frametime_change);
 577
 578         // If needed frametime change is small, just return
 579         // This value was 0.4 for many months until 2011-10-18 by c55;
 580         if (fabs(wanted_frametime_change) < wanted_frametime*0.33)
 581         {
 582                 //dstream<<"ignoring small wanted_frametime_change"<<std::endl;
 583                 return;
 584         }
 585
 586         f32 range = m_draw_control.wanted_range;
 587         f32 new_range = range;
 588
 589         f32 d_range = range - m_range_old;
 590         f32 d_busytime = busytime_in - m_busytime_old;
 591         if (d_range != 0)
 592         {
 593                 m_time_per_range = d_busytime / d_range;
 594         }
 595         //dstream<<"time_per_range="<<m_time_per_range<<std::endl;
 596         g_profiler->avg("time_per_range", m_time_per_range);
 597
 598         // The minimum allowed calculated frametime-range derivative:
 599         // Practically this sets the maximum speed of changing the range.
 600         // The lower this value, the higher the maximum changing speed.
 601         // A low value here results in wobbly range (0.001)
 602         // A low value can cause oscillation in very nonlinear time/range curves.
 603         // A high value here results in slow changing range (0.0025)
 604         // SUGG: This could be dynamically adjusted so that when
 605         //       the camera is turning, this is lower
 606         //f32 min_time_per_range = 0.0010; // Up to 0.4.7
 607         f32 min_time_per_range = 0.0005;
 608         if(m_time_per_range < min_time_per_range)
 609         {
 610                 m_time_per_range = min_time_per_range;
 611                 //dstream<<"m_time_per_range="<<m_time_per_range<<" (min)"<<std::endl;
 612         }
 613         else
 614         {
 615                 //dstream<<"m_time_per_range="<<m_time_per_range<<std::endl;
 616         }
 617
 618         f32 wanted_range_change = wanted_frametime_change / m_time_per_range;
 619         // Dampen the change a bit to kill oscillations
 620         //wanted_range_change *= 0.9;
 621         //wanted_range_change *= 0.75;
 622         wanted_range_change *= 0.5;
 623         //dstream<<"wanted_range_change="<<wanted_range_change<<std::endl;
 624
 625         // If needed range change is very small, just return
 626         if(fabs(wanted_range_change) < 0.001)
 627         {
 628                 //dstream<<"ignoring small wanted_range_change"<<std::endl;
 629                 return;
 630         }
 631
 632         new_range += wanted_range_change;
 633
 634         //f32 new_range_unclamped = new_range;
 635         new_range = MYMAX(new_range, viewing_range_min);
 636         new_range = MYMIN(new_range, viewing_range_max);
 637         /*dstream<<"new_range="<<new_range_unclamped
 638                         <<", clamped to "<<new_range<<std::endl;*/
 639
 640         m_range_old = m_draw_control.wanted_range;
 641         m_busytime_old = busytime_in;
 642
 643         m_draw_control.wanted_range = new_range;
 644 }
 645
 646 void Camera::setDigging(s32 button)
 647 {
 648         if (m_digging_button == -1)
 649                 m_digging_button = button;
 650 }
 651
 652 void Camera::wield(const ItemStack &item)
 653 {
 654         if (item.name != m_wield_item_next.name) {
 655                 m_wield_item_next = item;
 656                 if (m_wield_change_timer > 0)
 657                         m_wield_change_timer = -m_wield_change_timer;
 658                 else if (m_wield_change_timer == 0)
 659                         m_wield_change_timer = -0.001;
 660         }
 661 }
 662
 663 void Camera::drawWieldedTool(irr::core::matrix4* translation)
 664 {
 665         // Clear Z buffer so that the wielded tool stay in front of world geometry
 666         m_wieldmgr->getVideoDriver()->clearZBuffer();
 667
 668         // Draw the wielded node (in a separate scene manager)
 669         scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
 670         cam->setAspectRatio(m_cameranode->getAspectRatio());
 671         cam->setFOV(72.0*M_PI/180.0);
 672         cam->setNearValue(0.1);
 673         cam->setFarValue(1000);
 674         if (translation != NULL)
 675         {
 676                 irr::core::matrix4 startMatrix = cam->getAbsoluteTransformation();
 677                 irr::core::vector3df focusPoint = (cam->getTarget()
 678                                 - cam->getAbsolutePosition()).setLength(1)
 679                                 + cam->getAbsolutePosition();
 680
 681                 irr::core::vector3df camera_pos =
 682                                 (startMatrix * *translation).getTranslation();
 683                 cam->setPosition(camera_pos);
 684                 cam->setTarget(focusPoint);
 685         }
 686         m_wieldmgr->drawAll();
 687 }