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 #include "fontengine.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         m_driver = smgr->getVideoDriver();
  86         // note: making the camera node a child of the player node
  87         // would lead to unexpected behaviour, so we don't do that.
  88         m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
  89         m_headnode = smgr->addEmptySceneNode(m_playernode);
  90         m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
  91         m_cameranode->bindTargetAndRotation(true);
  92
  93         // This needs to be in its own scene manager. It is drawn after
  94         // all other 3D scene nodes and before the GUI.
  95         m_wieldmgr = smgr->createNewSceneManager();
  96         m_wieldmgr->addCameraSceneNode();
  97         m_wieldnode = new WieldMeshSceneNode(m_wieldmgr->getRootSceneNode(), m_wieldmgr, -1, false);
  98         m_wieldnode->setItem(ItemStack(), m_gamedef);
  99         m_wieldnode->drop(); // m_wieldmgr grabbed it
 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         m_nametags.clear();
 116 }
 117
 118 Camera::~Camera()
 119 {
 120         m_wieldmgr->drop();
 121 }
 122
 123 bool Camera::successfullyCreated(std::string &error_message)
 124 {
 125         if (!m_playernode) {
 126                 error_message = "Failed to create the player scene node";
 127         } else if (!m_headnode) {
 128                 error_message = "Failed to create the head scene node";
 129         } else if (!m_cameranode) {
 130                 error_message = "Failed to create the camera scene node";
 131         } else if (!m_wieldmgr) {
 132                 error_message = "Failed to create the wielded item scene manager";
 133         } else if (!m_wieldnode) {
 134                 error_message = "Failed to create the wielded item scene node";
 135         } else {
 136                 error_message.clear();
 137         }
 138         return error_message.empty();
 139 }
 140
 141 // Returns the fractional part of x
 142 inline f32 my_modf(f32 x)
 143 {
 144         double dummy;
 145         return modf(x, &dummy);
 146 }
 147
 148 void Camera::step(f32 dtime)
 149 {
 150         if(m_view_bobbing_fall > 0)
 151         {
 152                 m_view_bobbing_fall -= 3 * dtime;
 153                 if(m_view_bobbing_fall <= 0)
 154                         m_view_bobbing_fall = -1; // Mark the effect as finished
 155         }
 156
 157         bool was_under_zero = m_wield_change_timer < 0;
 158         m_wield_change_timer = MYMIN(m_wield_change_timer + dtime, 0.125);
 159
 160         if (m_wield_change_timer >= 0 && was_under_zero)
 161                 m_wieldnode->setItem(m_wield_item_next, m_gamedef);
 162
 163         if (m_view_bobbing_state != 0)
 164         {
 165                 //f32 offset = dtime * m_view_bobbing_speed * 0.035;
 166                 f32 offset = dtime * m_view_bobbing_speed * 0.030;
 167                 if (m_view_bobbing_state == 2) {
 168                         // Animation is getting turned off
 169                         if (m_view_bobbing_anim < 0.25) {
 170                                 m_view_bobbing_anim -= offset;
 171                         } else if (m_view_bobbing_anim > 0.75) {
 172                                 m_view_bobbing_anim += offset;
 173                         }
 174
 175                         if (m_view_bobbing_anim < 0.5) {
 176                                 m_view_bobbing_anim += offset;
 177                                 if (m_view_bobbing_anim > 0.5)
 178                                         m_view_bobbing_anim = 0.5;
 179                         } else {
 180                                 m_view_bobbing_anim -= offset;
 181                                 if (m_view_bobbing_anim < 0.5)
 182                                         m_view_bobbing_anim = 0.5;
 183                         }
 184
 185                         if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
 186                                         fabs(m_view_bobbing_anim - 0.5) < 0.01) {
 187                                 m_view_bobbing_anim = 0;
 188                                 m_view_bobbing_state = 0;
 189                         }
 190                 }
 191                 else {
 192                         float was = m_view_bobbing_anim;
 193                         m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
 194                         bool step = (was == 0 ||
 195                                         (was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
 196                                         (was > 0.5f && m_view_bobbing_anim <= 0.5f));
 197                         if(step) {
 198                                 MtEvent *e = new SimpleTriggerEvent("ViewBobbingStep");
 199                                 m_gamedef->event()->put(e);
 200                         }
 201                 }
 202         }
 203
 204         if (m_digging_button != -1)
 205         {
 206                 f32 offset = dtime * 3.5;
 207                 float m_digging_anim_was = m_digging_anim;
 208                 m_digging_anim += offset;
 209                 if (m_digging_anim >= 1)
 210                 {
 211                         m_digging_anim = 0;
 212                         m_digging_button = -1;
 213                 }
 214                 float lim = 0.15;
 215                 if(m_digging_anim_was < lim && m_digging_anim >= lim)
 216                 {
 217                         if(m_digging_button == 0)
 218                         {
 219                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchLeft");
 220                                 m_gamedef->event()->put(e);
 221                         } else if(m_digging_button == 1) {
 222                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchRight");
 223                                 m_gamedef->event()->put(e);
 224                         }
 225                 }
 226         }
 227 }
 228
 229 void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
 230                 f32 tool_reload_ratio, ClientEnvironment &c_env)
 231 {
 232         // Get player position
 233         // Smooth the movement when walking up stairs
 234         v3f old_player_position = m_playernode->getPosition();
 235         v3f player_position = player->getPosition();
 236         if (player->isAttached && player->parent)
 237                 player_position = player->parent->getPosition();
 238         //if(player->touching_ground && player_position.Y > old_player_position.Y)
 239         if(player->touching_ground &&
 240                         player_position.Y > old_player_position.Y)
 241         {
 242                 f32 oldy = old_player_position.Y;
 243                 f32 newy = player_position.Y;
 244                 f32 t = exp(-23*frametime);
 245                 player_position.Y = oldy * t + newy * (1-t);
 246         }
 247
 248         // Set player node transformation
 249         m_playernode->setPosition(player_position);
 250         m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
 251         m_playernode->updateAbsolutePosition();
 252
 253         // Get camera tilt timer (hurt animation)
 254         float cameratilt = fabs(fabs(player->hurt_tilt_timer-0.75)-0.75);
 255
 256         // Fall bobbing animation
 257         float fall_bobbing = 0;
 258         if(player->camera_impact >= 1 && m_camera_mode < CAMERA_MODE_THIRD)
 259         {
 260                 if(m_view_bobbing_fall == -1) // Effect took place and has finished
 261                         player->camera_impact = m_view_bobbing_fall = 0;
 262                 else if(m_view_bobbing_fall == 0) // Initialize effect
 263                         m_view_bobbing_fall = 1;
 264
 265                 // Convert 0 -> 1 to 0 -> 1 -> 0
 266                 fall_bobbing = m_view_bobbing_fall < 0.5 ? m_view_bobbing_fall * 2 : -(m_view_bobbing_fall - 0.5) * 2 + 1;
 267                 // Smoothen and invert the above
 268                 fall_bobbing = sin(fall_bobbing * 0.5 * M_PI) * -1;
 269                 // Amplify according to the intensity of the impact
 270                 fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;
 271
 272                 fall_bobbing *= m_cache_fall_bobbing_amount;
 273         }
 274
 275         // Calculate players eye offset for different camera modes
 276         v3f PlayerEyeOffset = player->getEyeOffset();
 277         if (m_camera_mode == CAMERA_MODE_FIRST)
 278                 PlayerEyeOffset += player->eye_offset_first;
 279         else
 280                 PlayerEyeOffset += player->eye_offset_third;
 281
 282         // Set head node transformation
 283         m_headnode->setPosition(PlayerEyeOffset+v3f(0,cameratilt*-player->hurt_tilt_strength+fall_bobbing,0));
 284         m_headnode->setRotation(v3f(player->getPitch(), 0, cameratilt*player->hurt_tilt_strength));
 285         m_headnode->updateAbsolutePosition();
 286
 287         // Compute relative camera position and target
 288         v3f rel_cam_pos = v3f(0,0,0);
 289         v3f rel_cam_target = v3f(0,0,1);
 290         v3f rel_cam_up = v3f(0,1,0);
 291
 292         if (m_view_bobbing_anim != 0 && m_camera_mode < CAMERA_MODE_THIRD)
 293         {
 294                 f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
 295                 f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;
 296
 297                 #if 1
 298                 f32 bobknob = 1.2;
 299                 f32 bobtmp = sin(pow(bobfrac, bobknob) * M_PI);
 300                 //f32 bobtmp2 = cos(pow(bobfrac, bobknob) * M_PI);
 301
 302                 v3f bobvec = v3f(
 303                         0.3 * bobdir * sin(bobfrac * M_PI),
 304                         -0.28 * bobtmp * bobtmp,
 305                         0.);
 306
 307                 //rel_cam_pos += 0.2 * bobvec;
 308                 //rel_cam_target += 0.03 * bobvec;
 309                 //rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * M_PI);
 310                 float f = 1.0;
 311                 f *= m_cache_view_bobbing_amount;
 312                 rel_cam_pos += bobvec * f;
 313                 //rel_cam_target += 0.995 * bobvec * f;
 314                 rel_cam_target += bobvec * f;
 315                 rel_cam_target.Z -= 0.005 * bobvec.Z * f;
 316                 //rel_cam_target.X -= 0.005 * bobvec.X * f;
 317                 //rel_cam_target.Y -= 0.005 * bobvec.Y * f;
 318                 rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * M_PI * f);
 319                 #else
 320                 f32 angle_deg = 1 * bobdir * sin(bobfrac * M_PI);
 321                 f32 angle_rad = angle_deg * M_PI / 180;
 322                 f32 r = 0.05;
 323                 v3f off = v3f(
 324                         r * sin(angle_rad),
 325                         r * (cos(angle_rad) - 1),
 326                         0);
 327                 rel_cam_pos += off;
 328                 //rel_cam_target += off;
 329                 rel_cam_up.rotateXYBy(angle_deg);
 330                 #endif
 331
 332         }
 333
 334         // Compute absolute camera position and target
 335         m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
 336         m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);
 337
 338         v3f abs_cam_up;
 339         m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 340
 341         // Seperate camera position for calculation
 342         v3f my_cp = m_camera_position;
 343
 344         // Reposition the camera for third person view
 345         if (m_camera_mode > CAMERA_MODE_FIRST)
 346         {
 347                 if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 348                         m_camera_direction *= -1;
 349
 350                 my_cp.Y += 2;
 351
 352                 // Calculate new position
 353                 bool abort = false;
 354                 for (int i = BS; i <= BS*2.75; i++)
 355                 {
 356                         my_cp.X = m_camera_position.X + m_camera_direction.X*-i;
 357                         my_cp.Z = m_camera_position.Z + m_camera_direction.Z*-i;
 358                         if (i > 12)
 359                                 my_cp.Y = m_camera_position.Y + (m_camera_direction.Y*-i);
 360
 361                         // Prevent camera positioned inside nodes
 362                         INodeDefManager *nodemgr = m_gamedef->ndef();
 363                         MapNode n = c_env.getClientMap().getNodeNoEx(floatToInt(my_cp, BS));
 364                         const ContentFeatures& features = nodemgr->get(n);
 365                         if(features.walkable)
 366                         {
 367                                 my_cp.X += m_camera_direction.X*-1*-BS/2;
 368                                 my_cp.Z += m_camera_direction.Z*-1*-BS/2;
 369                                 my_cp.Y += m_camera_direction.Y*-1*-BS/2;
 370                                 abort = true;
 371                                 break;
 372                         }
 373                 }
 374
 375                 // If node blocks camera position don't move y to heigh
 376                 if (abort && my_cp.Y > player_position.Y+BS*2)
 377                         my_cp.Y = player_position.Y+BS*2;
 378         }
 379
 380         // Update offset if too far away from the center of the map
 381         m_camera_offset.X += CAMERA_OFFSET_STEP*
 382                         (((s16)(my_cp.X/BS) - m_camera_offset.X)/CAMERA_OFFSET_STEP);
 383         m_camera_offset.Y += CAMERA_OFFSET_STEP*
 384                         (((s16)(my_cp.Y/BS) - m_camera_offset.Y)/CAMERA_OFFSET_STEP);
 385         m_camera_offset.Z += CAMERA_OFFSET_STEP*
 386                         (((s16)(my_cp.Z/BS) - m_camera_offset.Z)/CAMERA_OFFSET_STEP);
 387
 388         // Set camera node transformation
 389         m_cameranode->setPosition(my_cp-intToFloat(m_camera_offset, BS));
 390         m_cameranode->setUpVector(abs_cam_up);
 391         // *100.0 helps in large map coordinates
 392         m_cameranode->setTarget(my_cp-intToFloat(m_camera_offset, BS) + 100 * m_camera_direction);
 393
 394         // update the camera position in front-view mode to render blocks behind player
 395         if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 396                 m_camera_position = my_cp;
 397
 398         // Get FOV setting
 399         f32 fov_degrees = m_cache_fov;
 400         fov_degrees = MYMAX(fov_degrees, 10.0);
 401         fov_degrees = MYMIN(fov_degrees, 170.0);
 402
 403         // FOV and aspect ratio
 404         m_aspect = (f32) porting::getWindowSize().X / (f32) porting::getWindowSize().Y;
 405         m_fov_y = fov_degrees * M_PI / 180.0;
 406         // Increase vertical FOV on lower aspect ratios (<16:10)
 407         m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
 408         m_fov_x = 2 * atan(m_aspect * tan(0.5 * m_fov_y));
 409         m_cameranode->setAspectRatio(m_aspect);
 410         m_cameranode->setFOV(m_fov_y);
 411
 412         // Position the wielded item
 413         //v3f wield_position = v3f(45, -35, 65);
 414         v3f wield_position = v3f(55, -35, 65);
 415         //v3f wield_rotation = v3f(-100, 120, -100);
 416         v3f wield_rotation = v3f(-100, 120, -100);
 417         wield_position.Y += fabs(m_wield_change_timer)*320 - 40;
 418         if(m_digging_anim < 0.05 || m_digging_anim > 0.5)
 419         {
 420                 f32 frac = 1.0;
 421                 if(m_digging_anim > 0.5)
 422                         frac = 2.0 * (m_digging_anim - 0.5);
 423                 // This value starts from 1 and settles to 0
 424                 f32 ratiothing = pow((1.0f - tool_reload_ratio), 0.5f);
 425                 //f32 ratiothing2 = pow(ratiothing, 0.5f);
 426                 f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
 427                 wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
 428                 //wield_position.Z += frac * 5.0 * ratiothing2;
 429                 wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
 430                 wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
 431                 //wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
 432                 //wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
 433         }
 434         if (m_digging_button != -1)
 435         {
 436                 f32 digfrac = m_digging_anim;
 437                 wield_position.X -= 50 * sin(pow(digfrac, 0.8f) * M_PI);
 438                 wield_position.Y += 24 * sin(digfrac * 1.8 * M_PI);
 439                 wield_position.Z += 25 * 0.5;
 440
 441                 // Euler angles are PURE EVIL, so why not use quaternions?
 442                 core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
 443                 core::quaternion quat_end(v3f(80, 30, 100) * core::DEGTORAD);
 444                 core::quaternion quat_slerp;
 445                 quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * M_PI));
 446                 quat_slerp.toEuler(wield_rotation);
 447                 wield_rotation *= core::RADTODEG;
 448         } else {
 449                 f32 bobfrac = my_modf(m_view_bobbing_anim);
 450                 wield_position.X -= sin(bobfrac*M_PI*2.0) * 3.0;
 451                 wield_position.Y += sin(my_modf(bobfrac*2.0)*M_PI) * 3.0;
 452         }
 453         m_wieldnode->setPosition(wield_position);
 454         m_wieldnode->setRotation(wield_rotation);
 455
 456         m_wieldnode->setColor(player->light_color);
 457
 458         // Render distance feedback loop
 459         updateViewingRange(frametime, busytime);
 460
 461         // If the player is walking, swimming, or climbing,
 462         // view bobbing is enabled and free_move is off,
 463         // start (or continue) the view bobbing animation.
 464         v3f speed = player->getSpeed();
 465         const bool movement_XZ = hypot(speed.X, speed.Z) > BS;
 466         const bool movement_Y = fabs(speed.Y) > BS;
 467
 468         const bool walking = movement_XZ && player->touching_ground;
 469         const bool swimming = (movement_XZ || player->swimming_vertical) && player->in_liquid;
 470         const bool climbing = movement_Y && player->is_climbing;
 471         if ((walking || swimming || climbing) &&
 472                         m_cache_view_bobbing &&
 473                         (!g_settings->getBool("free_move") || !m_gamedef->checkLocalPrivilege("fly")))
 474         {
 475                 // Start animation
 476                 m_view_bobbing_state = 1;
 477                 m_view_bobbing_speed = MYMIN(speed.getLength(), 40);
 478         }
 479         else if (m_view_bobbing_state == 1)
 480         {
 481                 // Stop animation
 482                 m_view_bobbing_state = 2;
 483                 m_view_bobbing_speed = 60;
 484         }
 485 }
 486
 487 void Camera::updateViewingRange(f32 frametime_in, f32 busytime_in)
 488 {
 489         if (m_draw_control.range_all)
 490                 return;
 491
 492         m_added_busytime += busytime_in;
 493         m_added_frames += 1;
 494
 495         m_frametime_counter -= frametime_in;
 496         if (m_frametime_counter > 0)
 497                 return;
 498         m_frametime_counter = 0.2; // Same as ClientMap::updateDrawList interval
 499
 500         /*dstream<<FUNCTION_NAME
 501                         <<": Collected "<<m_added_frames<<" frames, total of "
 502                         <<m_added_busytime<<"s."<<std::endl;
 503
 504         dstream<<"m_draw_control.blocks_drawn="
 505                         <<m_draw_control.blocks_drawn
 506                         <<", m_draw_control.blocks_would_have_drawn="
 507                         <<m_draw_control.blocks_would_have_drawn
 508                         <<std::endl;*/
 509
 510         // Get current viewing range and FPS settings
 511         f32 viewing_range_min = g_settings->getFloat("viewing_range_nodes_min");
 512         viewing_range_min = MYMAX(15.0, viewing_range_min);
 513
 514         f32 viewing_range_max = g_settings->getFloat("viewing_range_nodes_max");
 515         viewing_range_max = MYMAX(viewing_range_min, viewing_range_max);
 516
 517         // Immediately apply hard limits
 518         if(m_draw_control.wanted_range < viewing_range_min)
 519                 m_draw_control.wanted_range = viewing_range_min;
 520         if(m_draw_control.wanted_range > viewing_range_max)
 521                 m_draw_control.wanted_range = viewing_range_max;
 522
 523         // Just so big a value that everything rendered is visible
 524         // Some more allowance than viewing_range_max * BS because of clouds,
 525         // active objects, etc.
 526         if(viewing_range_max < 200*BS)
 527                 m_cameranode->setFarValue(200 * BS * 10);
 528         else
 529                 m_cameranode->setFarValue(viewing_range_max * BS * 10);
 530
 531         f32 wanted_fps = m_cache_wanted_fps;
 532         wanted_fps = MYMAX(wanted_fps, 1.0);
 533         f32 wanted_frametime = 1.0 / wanted_fps;
 534
 535         m_draw_control.wanted_min_range = viewing_range_min;
 536         m_draw_control.wanted_max_blocks = (2.0*m_draw_control.blocks_would_have_drawn)+1;
 537         if (m_draw_control.wanted_max_blocks < 10)
 538                 m_draw_control.wanted_max_blocks = 10;
 539
 540         f32 block_draw_ratio = 1.0;
 541         if (m_draw_control.blocks_would_have_drawn != 0)
 542         {
 543                 block_draw_ratio = (f32)m_draw_control.blocks_drawn
 544                         / (f32)m_draw_control.blocks_would_have_drawn;
 545         }
 546
 547         // Calculate the average frametime in the case that all wanted
 548         // blocks had been drawn
 549         f32 frametime = m_added_busytime / m_added_frames / block_draw_ratio;
 550
 551         m_added_busytime = 0.0;
 552         m_added_frames = 0;
 553
 554         f32 wanted_frametime_change = wanted_frametime - frametime;
 555         //dstream<<"wanted_frametime_change="<<wanted_frametime_change<<std::endl;
 556         g_profiler->avg("wanted_frametime_change", wanted_frametime_change);
 557
 558         // If needed frametime change is small, just return
 559         // This value was 0.4 for many months until 2011-10-18 by c55;
 560         if (fabs(wanted_frametime_change) < wanted_frametime*0.33)
 561         {
 562                 //dstream<<"ignoring small wanted_frametime_change"<<std::endl;
 563                 return;
 564         }
 565
 566         f32 range = m_draw_control.wanted_range;
 567         f32 new_range = range;
 568
 569         f32 d_range = range - m_range_old;
 570         f32 d_busytime = busytime_in - m_busytime_old;
 571         if (d_range != 0)
 572         {
 573                 m_time_per_range = d_busytime / d_range;
 574         }
 575         //dstream<<"time_per_range="<<m_time_per_range<<std::endl;
 576         g_profiler->avg("time_per_range", m_time_per_range);
 577
 578         // The minimum allowed calculated frametime-range derivative:
 579         // Practically this sets the maximum speed of changing the range.
 580         // The lower this value, the higher the maximum changing speed.
 581         // A low value here results in wobbly range (0.001)
 582         // A low value can cause oscillation in very nonlinear time/range curves.
 583         // A high value here results in slow changing range (0.0025)
 584         // SUGG: This could be dynamically adjusted so that when
 585         //       the camera is turning, this is lower
 586         //f32 min_time_per_range = 0.0010; // Up to 0.4.7
 587         f32 min_time_per_range = 0.0005;
 588         if(m_time_per_range < min_time_per_range)
 589         {
 590                 m_time_per_range = min_time_per_range;
 591                 //dstream<<"m_time_per_range="<<m_time_per_range<<" (min)"<<std::endl;
 592         }
 593         else
 594         {
 595                 //dstream<<"m_time_per_range="<<m_time_per_range<<std::endl;
 596         }
 597
 598         f32 wanted_range_change = wanted_frametime_change / m_time_per_range;
 599         // Dampen the change a bit to kill oscillations
 600         //wanted_range_change *= 0.9;
 601         //wanted_range_change *= 0.75;
 602         wanted_range_change *= 0.5;
 603         //dstream<<"wanted_range_change="<<wanted_range_change<<std::endl;
 604
 605         // If needed range change is very small, just return
 606         if(fabs(wanted_range_change) < 0.001)
 607         {
 608                 //dstream<<"ignoring small wanted_range_change"<<std::endl;
 609                 return;
 610         }
 611
 612         new_range += wanted_range_change;
 613
 614         //f32 new_range_unclamped = new_range;
 615         new_range = MYMAX(new_range, viewing_range_min);
 616         new_range = MYMIN(new_range, viewing_range_max);
 617         /*dstream<<"new_range="<<new_range_unclamped
 618                         <<", clamped to "<<new_range<<std::endl;*/
 619
 620         m_range_old = m_draw_control.wanted_range;
 621         m_busytime_old = busytime_in;
 622
 623         m_draw_control.wanted_range = new_range;
 624 }
 625
 626 void Camera::setDigging(s32 button)
 627 {
 628         if (m_digging_button == -1)
 629                 m_digging_button = button;
 630 }
 631
 632 void Camera::wield(const ItemStack &item)
 633 {
 634         if (item.name != m_wield_item_next.name) {
 635                 m_wield_item_next = item;
 636                 if (m_wield_change_timer > 0)
 637                         m_wield_change_timer = -m_wield_change_timer;
 638                 else if (m_wield_change_timer == 0)
 639                         m_wield_change_timer = -0.001;
 640         }
 641 }
 642
 643 void Camera::drawWieldedTool(irr::core::matrix4* translation)
 644 {
 645         // Clear Z buffer so that the wielded tool stay in front of world geometry
 646         m_wieldmgr->getVideoDriver()->clearZBuffer();
 647
 648         // Draw the wielded node (in a separate scene manager)
 649         scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
 650         cam->setAspectRatio(m_cameranode->getAspectRatio());
 651         cam->setFOV(72.0*M_PI/180.0);
 652         cam->setNearValue(10);
 653         cam->setFarValue(1000);
 654         if (translation != NULL)
 655         {
 656                 irr::core::matrix4 startMatrix = cam->getAbsoluteTransformation();
 657                 irr::core::vector3df focusPoint = (cam->getTarget()
 658                                 - cam->getAbsolutePosition()).setLength(1)
 659                                 + cam->getAbsolutePosition();
 660
 661                 irr::core::vector3df camera_pos =
 662                                 (startMatrix * *translation).getTranslation();
 663                 cam->setPosition(camera_pos);
 664                 cam->setTarget(focusPoint);
 665         }
 666         m_wieldmgr->drawAll();
 667 }
 668
 669 void Camera::drawNametags()
 670 {
 671         core::matrix4 trans = m_cameranode->getProjectionMatrix();
 672         trans *= m_cameranode->getViewMatrix();
 673
 674         for (std::list<Nametag *>::const_iterator
 675                         i = m_nametags.begin();
 676                         i != m_nametags.end(); ++i) {
 677                 Nametag *nametag = *i;
 678                 v3f pos = nametag->parent_node->getPosition() -
 679                         intToFloat(m_camera_offset, BS) + v3f(0.0, 1.1 * BS, 0.0);
 680                 f32 transformed_pos[4] = { pos.X, pos.Y, pos.Z, 1.0f };
 681                 trans.multiplyWith1x4Matrix(transformed_pos);
 682                 if (transformed_pos[3] > 0) {
 683                         core::dimension2d<u32> textsize =
 684                                 g_fontengine->getFont()->getDimension(
 685                                 utf8_to_wide(nametag->nametag_text).c_str());
 686                         f32 zDiv = transformed_pos[3] == 0.0f ? 1.0f :
 687                                 core::reciprocal(transformed_pos[3]);
 688                         v2u32 screensize = m_driver->getScreenSize();
 689                         v2s32 screen_pos;
 690                         screen_pos.X = screensize.X *
 691                                 (0.5 * transformed_pos[0] * zDiv + 0.5) - textsize.Width / 2;
 692                         screen_pos.Y = screensize.Y *
 693                                 (0.5 - transformed_pos[1] * zDiv * 0.5) - textsize.Height / 2;
 694                         core::rect<s32> size(0, 0, textsize.Width, textsize.Height);
 695                         g_fontengine->getFont()->draw(utf8_to_wide(nametag->nametag_text).c_str(),
 696                                         size + screen_pos, nametag->nametag_color);
 697                 }
 698         }
 699 }
 700
 701 Nametag *Camera::addNametag(scene::ISceneNode *parent_node,
 702                 std::string nametag_text, video::SColor nametag_color)
 703 {
 704         Nametag *nametag = new Nametag(parent_node, nametag_text, nametag_color);
 705         m_nametags.push_back(nametag);
 706         return nametag;
 707 }
 708
 709 void Camera::removeNametag(Nametag *nametag)
 710 {
 711         m_nametags.remove(nametag);
 712         delete nametag;
 713 }