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