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