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 "client/renderingengine.h"
  28 #include "settings.h"
  29 #include "wieldmesh.h"
  30 #include "noise.h"         // easeCurve
  31 #include "sound.h"
  32 #include "event.h"
  33 #include "nodedef.h"
  34 #include "util/numeric.h"
  35 #include "constants.h"
  36 #include "fontengine.h"
  37 #include "script/scripting_client.h"
  38
  39 #define CAMERA_OFFSET_STEP 200
  40 #define WIELDMESH_OFFSET_X 55.0f
  41 #define WIELDMESH_OFFSET_Y -35.0f
  42
  43 Camera::Camera(MapDrawControl &draw_control, Client *client):
  44         m_draw_control(draw_control),
  45         m_client(client)
  46 {
  47         scene::ISceneManager *smgr = RenderingEngine::get_scene_manager();
  48         // note: making the camera node a child of the player node
  49         // would lead to unexpected behaviour, so we don't do that.
  50         m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
  51         m_headnode = smgr->addEmptySceneNode(m_playernode);
  52         m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
  53         m_cameranode->bindTargetAndRotation(true);
  54
  55         // This needs to be in its own scene manager. It is drawn after
  56         // all other 3D scene nodes and before the GUI.
  57         m_wieldmgr = smgr->createNewSceneManager();
  58         m_wieldmgr->addCameraSceneNode();
  59         m_wieldnode = new WieldMeshSceneNode(m_wieldmgr, -1, false);
  60         m_wieldnode->setItem(ItemStack(), m_client);
  61         m_wieldnode->drop(); // m_wieldmgr grabbed it
  62
  63         /* TODO: Add a callback function so these can be updated when a setting
  64          *       changes.  At this point in time it doesn't matter (e.g. /set
  65          *       is documented to change server settings only)
  66          *
  67          * TODO: Local caching of settings is not optimal and should at some stage
  68          *       be updated to use a global settings object for getting thse values
  69          *       (as opposed to the this local caching). This can be addressed in
  70          *       a later release.
  71          */
  72         m_cache_fall_bobbing_amount = g_settings->getFloat("fall_bobbing_amount");
  73         m_cache_view_bobbing_amount = g_settings->getFloat("view_bobbing_amount");
  74         // 45 degrees is the lowest FOV that doesn't cause the server to treat this
  75         // as a zoom FOV and load world beyond the set server limits.
  76         m_cache_fov                 = std::fmax(g_settings->getFloat("fov"), 45.0f);
  77         m_arm_inertia               = g_settings->getBool("arm_inertia");
  78         m_nametags.clear();
  79 }
  80
  81 Camera::~Camera()
  82 {
  83         m_wieldmgr->drop();
  84 }
  85
  86 bool Camera::successfullyCreated(std::string &error_message)
  87 {
  88         if (!m_playernode) {
  89                 error_message = "Failed to create the player scene node";
  90         } else if (!m_headnode) {
  91                 error_message = "Failed to create the head scene node";
  92         } else if (!m_cameranode) {
  93                 error_message = "Failed to create the camera scene node";
  94         } else if (!m_wieldmgr) {
  95                 error_message = "Failed to create the wielded item scene manager";
  96         } else if (!m_wieldnode) {
  97                 error_message = "Failed to create the wielded item scene node";
  98         } else {
  99                 error_message.clear();
 100         }
 101
 102         if (g_settings->getBool("enable_client_modding")) {
 103                 m_client->getScript()->on_camera_ready(this);
 104         }
 105         return error_message.empty();
 106 }
 107
 108 // Returns the fractional part of x
 109 inline f32 my_modf(f32 x)
 110 {
 111         double dummy;
 112         return modf(x, &dummy);
 113 }
 114
 115 void Camera::step(f32 dtime)
 116 {
 117         if(m_view_bobbing_fall > 0)
 118         {
 119                 m_view_bobbing_fall -= 3 * dtime;
 120                 if(m_view_bobbing_fall <= 0)
 121                         m_view_bobbing_fall = -1; // Mark the effect as finished
 122         }
 123
 124         bool was_under_zero = m_wield_change_timer < 0;
 125         m_wield_change_timer = MYMIN(m_wield_change_timer + dtime, 0.125);
 126
 127         if (m_wield_change_timer >= 0 && was_under_zero)
 128                 m_wieldnode->setItem(m_wield_item_next, m_client);
 129
 130         if (m_view_bobbing_state != 0)
 131         {
 132                 //f32 offset = dtime * m_view_bobbing_speed * 0.035;
 133                 f32 offset = dtime * m_view_bobbing_speed * 0.030;
 134                 if (m_view_bobbing_state == 2) {
 135                         // Animation is getting turned off
 136                         if (m_view_bobbing_anim < 0.25) {
 137                                 m_view_bobbing_anim -= offset;
 138                         } else if (m_view_bobbing_anim > 0.75) {
 139                                 m_view_bobbing_anim += offset;
 140                         }
 141
 142                         if (m_view_bobbing_anim < 0.5) {
 143                                 m_view_bobbing_anim += offset;
 144                                 if (m_view_bobbing_anim > 0.5)
 145                                         m_view_bobbing_anim = 0.5;
 146                         } else {
 147                                 m_view_bobbing_anim -= offset;
 148                                 if (m_view_bobbing_anim < 0.5)
 149                                         m_view_bobbing_anim = 0.5;
 150                         }
 151
 152                         if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
 153                                         fabs(m_view_bobbing_anim - 0.5) < 0.01) {
 154                                 m_view_bobbing_anim = 0;
 155                                 m_view_bobbing_state = 0;
 156                         }
 157                 }
 158                 else {
 159                         float was = m_view_bobbing_anim;
 160                         m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
 161                         bool step = (was == 0 ||
 162                                         (was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
 163                                         (was > 0.5f && m_view_bobbing_anim <= 0.5f));
 164                         if(step) {
 165                                 m_client->getEventManager()->put(new SimpleTriggerEvent(MtEvent::VIEW_BOBBING_STEP));
 166                         }
 167                 }
 168         }
 169
 170         if (m_digging_button != -1) {
 171                 f32 offset = dtime * 3.5f;
 172                 float m_digging_anim_was = m_digging_anim;
 173                 m_digging_anim += offset;
 174                 if (m_digging_anim >= 1)
 175                 {
 176                         m_digging_anim = 0;
 177                         m_digging_button = -1;
 178                 }
 179                 float lim = 0.15;
 180                 if(m_digging_anim_was < lim && m_digging_anim >= lim)
 181                 {
 182                         if (m_digging_button == 0) {
 183                                 m_client->getEventManager()->put(new SimpleTriggerEvent(MtEvent::CAMERA_PUNCH_LEFT));
 184                         } else if(m_digging_button == 1) {
 185                                 m_client->getEventManager()->put(new SimpleTriggerEvent(MtEvent::CAMERA_PUNCH_RIGHT));
 186                         }
 187                 }
 188         }
 189 }
 190
 191 static inline v2f dir(const v2f &pos_dist)
 192 {
 193         f32 x = pos_dist.X - WIELDMESH_OFFSET_X;
 194         f32 y = pos_dist.Y - WIELDMESH_OFFSET_Y;
 195
 196         f32 x_abs = std::fabs(x);
 197         f32 y_abs = std::fabs(y);
 198
 199         if (x_abs >= y_abs) {
 200                 y *= (1.0f / x_abs);
 201                 x /= x_abs;
 202         }
 203
 204         if (y_abs >= x_abs) {
 205                 x *= (1.0f / y_abs);
 206                 y /= y_abs;
 207         }
 208
 209         return v2f(std::fabs(x), std::fabs(y));
 210 }
 211
 212 void Camera::addArmInertia(f32 player_yaw)
 213 {
 214         m_cam_vel.X = std::fabs(rangelim(m_last_cam_pos.X - player_yaw,
 215                 -100.0f, 100.0f) / 0.016f) * 0.01f;
 216         m_cam_vel.Y = std::fabs((m_last_cam_pos.Y - m_camera_direction.Y) / 0.016f);
 217         f32 gap_X = std::fabs(WIELDMESH_OFFSET_X - m_wieldmesh_offset.X);
 218         f32 gap_Y = std::fabs(WIELDMESH_OFFSET_Y - m_wieldmesh_offset.Y);
 219
 220         if (m_cam_vel.X > 1.0f || m_cam_vel.Y > 1.0f) {
 221                 /*
 222                     The arm moves relative to the camera speed,
 223                     with an acceleration factor.
 224                 */
 225
 226                 if (m_cam_vel.X > 1.0f) {
 227                         if (m_cam_vel.X > m_cam_vel_old.X)
 228                                 m_cam_vel_old.X = m_cam_vel.X;
 229
 230                         f32 acc_X = 0.12f * (m_cam_vel.X - (gap_X * 0.1f));
 231                         m_wieldmesh_offset.X += m_last_cam_pos.X < player_yaw ? acc_X : -acc_X;
 232
 233                         if (m_last_cam_pos.X != player_yaw)
 234                                 m_last_cam_pos.X = player_yaw;
 235
 236                         m_wieldmesh_offset.X = rangelim(m_wieldmesh_offset.X,
 237                                 WIELDMESH_OFFSET_X - 7.0f, WIELDMESH_OFFSET_X + 7.0f);
 238                 }
 239
 240                 if (m_cam_vel.Y > 1.0f) {
 241                         if (m_cam_vel.Y > m_cam_vel_old.Y)
 242                                 m_cam_vel_old.Y = m_cam_vel.Y;
 243
 244                         f32 acc_Y = 0.12f * (m_cam_vel.Y - (gap_Y * 0.1f));
 245                         m_wieldmesh_offset.Y +=
 246                                 m_last_cam_pos.Y > m_camera_direction.Y ? acc_Y : -acc_Y;
 247
 248                         if (m_last_cam_pos.Y != m_camera_direction.Y)
 249                                 m_last_cam_pos.Y = m_camera_direction.Y;
 250
 251                         m_wieldmesh_offset.Y = rangelim(m_wieldmesh_offset.Y,
 252                                 WIELDMESH_OFFSET_Y - 10.0f, WIELDMESH_OFFSET_Y + 5.0f);
 253                 }
 254
 255                 m_arm_dir = dir(m_wieldmesh_offset);
 256         } else {
 257                 /*
 258                     Now the arm gets back to its default position when the camera stops,
 259                     following a vector, with a smooth deceleration factor.
 260                 */
 261
 262                 f32 dec_X = 0.12f * (m_cam_vel_old.X * (1.0f +
 263                         (1.0f - m_arm_dir.X))) * (gap_X / 20.0f);
 264
 265                 f32 dec_Y = 0.06f * (m_cam_vel_old.Y * (1.0f +
 266                         (1.0f - m_arm_dir.Y))) * (gap_Y / 15.0f);
 267
 268                 if (gap_X < 0.1f)
 269                         m_cam_vel_old.X = 0.0f;
 270
 271                 m_wieldmesh_offset.X -=
 272                         m_wieldmesh_offset.X > WIELDMESH_OFFSET_X ? dec_X : -dec_X;
 273
 274                 if (gap_Y < 0.1f)
 275                         m_cam_vel_old.Y = 0.0f;
 276
 277                 m_wieldmesh_offset.Y -=
 278                         m_wieldmesh_offset.Y > WIELDMESH_OFFSET_Y ? dec_Y : -dec_Y;
 279         }
 280 }
 281
 282 void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime, f32 tool_reload_ratio)
 283 {
 284         // Get player position
 285         // Smooth the movement when walking up stairs
 286         v3f old_player_position = m_playernode->getPosition();
 287         v3f player_position = player->getPosition();
 288         if (player->isAttached && player->parent)
 289                 player_position = player->parent->getPosition();
 290         //if(player->touching_ground && player_position.Y > old_player_position.Y)
 291         if(player->touching_ground &&
 292                         player_position.Y > old_player_position.Y)
 293         {
 294                 f32 oldy = old_player_position.Y;
 295                 f32 newy = player_position.Y;
 296                 f32 t = std::exp(-23 * frametime);
 297                 player_position.Y = oldy * t + newy * (1-t);
 298         }
 299
 300         // Set player node transformation
 301         m_playernode->setPosition(player_position);
 302         m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
 303         m_playernode->updateAbsolutePosition();
 304
 305         // Get camera tilt timer (hurt animation)
 306         float cameratilt = fabs(fabs(player->hurt_tilt_timer-0.75)-0.75);
 307
 308         // Fall bobbing animation
 309         float fall_bobbing = 0;
 310         if(player->camera_impact >= 1 && m_camera_mode < CAMERA_MODE_THIRD)
 311         {
 312                 if(m_view_bobbing_fall == -1) // Effect took place and has finished
 313                         player->camera_impact = m_view_bobbing_fall = 0;
 314                 else if(m_view_bobbing_fall == 0) // Initialize effect
 315                         m_view_bobbing_fall = 1;
 316
 317                 // Convert 0 -> 1 to 0 -> 1 -> 0
 318                 fall_bobbing = m_view_bobbing_fall < 0.5 ? m_view_bobbing_fall * 2 : -(m_view_bobbing_fall - 0.5) * 2 + 1;
 319                 // Smoothen and invert the above
 320                 fall_bobbing = sin(fall_bobbing * 0.5 * M_PI) * -1;
 321                 // Amplify according to the intensity of the impact
 322                 fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;
 323
 324                 fall_bobbing *= m_cache_fall_bobbing_amount;
 325         }
 326
 327         // Calculate players eye offset for different camera modes
 328         v3f PlayerEyeOffset = player->getEyeOffset();
 329         if (m_camera_mode == CAMERA_MODE_FIRST)
 330                 PlayerEyeOffset += player->eye_offset_first;
 331         else
 332                 PlayerEyeOffset += player->eye_offset_third;
 333
 334         // Set head node transformation
 335         m_headnode->setPosition(PlayerEyeOffset+v3f(0,cameratilt*-player->hurt_tilt_strength+fall_bobbing,0));
 336         m_headnode->setRotation(v3f(player->getPitch(), 0, cameratilt*player->hurt_tilt_strength));
 337         m_headnode->updateAbsolutePosition();
 338
 339         // Compute relative camera position and target
 340         v3f rel_cam_pos = v3f(0,0,0);
 341         v3f rel_cam_target = v3f(0,0,1);
 342         v3f rel_cam_up = v3f(0,1,0);
 343
 344         if (m_cache_view_bobbing_amount != 0.0f && m_view_bobbing_anim != 0.0f &&
 345                 m_camera_mode < CAMERA_MODE_THIRD) {
 346                 f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
 347                 f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;
 348
 349                 #if 1
 350                 f32 bobknob = 1.2;
 351                 f32 bobtmp = sin(pow(bobfrac, bobknob) * M_PI);
 352                 //f32 bobtmp2 = cos(pow(bobfrac, bobknob) * M_PI);
 353
 354                 v3f bobvec = v3f(
 355                         0.3 * bobdir * sin(bobfrac * M_PI),
 356                         -0.28 * bobtmp * bobtmp,
 357                         0.);
 358
 359                 //rel_cam_pos += 0.2 * bobvec;
 360                 //rel_cam_target += 0.03 * bobvec;
 361                 //rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * M_PI);
 362                 float f = 1.0;
 363                 f *= m_cache_view_bobbing_amount;
 364                 rel_cam_pos += bobvec * f;
 365                 //rel_cam_target += 0.995 * bobvec * f;
 366                 rel_cam_target += bobvec * f;
 367                 rel_cam_target.Z -= 0.005 * bobvec.Z * f;
 368                 //rel_cam_target.X -= 0.005 * bobvec.X * f;
 369                 //rel_cam_target.Y -= 0.005 * bobvec.Y * f;
 370                 rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * M_PI * f);
 371                 #else
 372                 f32 angle_deg = 1 * bobdir * sin(bobfrac * M_PI);
 373                 f32 angle_rad = angle_deg * M_PI / 180;
 374                 f32 r = 0.05;
 375                 v3f off = v3f(
 376                         r * sin(angle_rad),
 377                         r * (cos(angle_rad) - 1),
 378                         0);
 379                 rel_cam_pos += off;
 380                 //rel_cam_target += off;
 381                 rel_cam_up.rotateXYBy(angle_deg);
 382                 #endif
 383
 384         }
 385
 386         // Compute absolute camera position and target
 387         m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
 388         m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);
 389
 390         v3f abs_cam_up;
 391         m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 392
 393         // Seperate camera position for calculation
 394         v3f my_cp = m_camera_position;
 395
 396         // Reposition the camera for third person view
 397         if (m_camera_mode > CAMERA_MODE_FIRST)
 398         {
 399                 if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 400                         m_camera_direction *= -1;
 401
 402                 my_cp.Y += 2;
 403
 404                 // Calculate new position
 405                 bool abort = false;
 406                 for (int i = BS; i <= BS * 2.75; i++) {
 407                         my_cp.X = m_camera_position.X + m_camera_direction.X * -i;
 408                         my_cp.Z = m_camera_position.Z + m_camera_direction.Z * -i;
 409                         if (i > 12)
 410                                 my_cp.Y = m_camera_position.Y + (m_camera_direction.Y * -i);
 411
 412                         // Prevent camera positioned inside nodes
 413                         const NodeDefManager *nodemgr = m_client->ndef();
 414                         MapNode n = m_client->getEnv().getClientMap()
 415                                 .getNodeNoEx(floatToInt(my_cp, BS));
 416
 417                         const ContentFeatures& features = nodemgr->get(n);
 418                         if (features.walkable) {
 419                                 my_cp.X += m_camera_direction.X*-1*-BS/2;
 420                                 my_cp.Z += m_camera_direction.Z*-1*-BS/2;
 421                                 my_cp.Y += m_camera_direction.Y*-1*-BS/2;
 422                                 abort = true;
 423                                 break;
 424                         }
 425                 }
 426
 427                 // If node blocks camera position don't move y to heigh
 428                 if (abort && my_cp.Y > player_position.Y+BS*2)
 429                         my_cp.Y = player_position.Y+BS*2;
 430         }
 431
 432         // Update offset if too far away from the center of the map
 433         m_camera_offset.X += CAMERA_OFFSET_STEP*
 434                         (((s16)(my_cp.X/BS) - m_camera_offset.X)/CAMERA_OFFSET_STEP);
 435         m_camera_offset.Y += CAMERA_OFFSET_STEP*
 436                         (((s16)(my_cp.Y/BS) - m_camera_offset.Y)/CAMERA_OFFSET_STEP);
 437         m_camera_offset.Z += CAMERA_OFFSET_STEP*
 438                         (((s16)(my_cp.Z/BS) - m_camera_offset.Z)/CAMERA_OFFSET_STEP);
 439
 440         // Set camera node transformation
 441         m_cameranode->setPosition(my_cp-intToFloat(m_camera_offset, BS));
 442         m_cameranode->setUpVector(abs_cam_up);
 443         // *100.0 helps in large map coordinates
 444         m_cameranode->setTarget(my_cp-intToFloat(m_camera_offset, BS) + 100 * m_camera_direction);
 445
 446         // update the camera position in third-person mode to render blocks behind player
 447         // and correctly apply liquid post FX.
 448         if (m_camera_mode != CAMERA_MODE_FIRST)
 449                 m_camera_position = my_cp;
 450
 451         // Get FOV
 452         f32 fov_degrees;
 453         // Disable zoom with zoom FOV = 0
 454         if (player->getPlayerControl().zoom && player->getZoomFOV() > 0.001f) {
 455                 fov_degrees = player->getZoomFOV();
 456         } else {
 457                 fov_degrees = m_cache_fov;
 458         }
 459         fov_degrees = rangelim(fov_degrees, 1.0f, 160.0f);
 460
 461         // FOV and aspect ratio
 462         const v2u32 &window_size = RenderingEngine::get_instance()->getWindowSize();
 463         m_aspect = (f32) window_size.X / (f32) window_size.Y;
 464         m_fov_y = fov_degrees * M_PI / 180.0;
 465         // Increase vertical FOV on lower aspect ratios (<16:10)
 466         m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
 467         m_fov_x = 2 * atan(m_aspect * tan(0.5 * m_fov_y));
 468         m_cameranode->setAspectRatio(m_aspect);
 469         m_cameranode->setFOV(m_fov_y);
 470
 471         if (m_arm_inertia)
 472                 addArmInertia(player->getYaw());
 473
 474         // Position the wielded item
 475         //v3f wield_position = v3f(45, -35, 65);
 476         v3f wield_position = v3f(m_wieldmesh_offset.X, m_wieldmesh_offset.Y, 65);
 477         //v3f wield_rotation = v3f(-100, 120, -100);
 478         v3f wield_rotation = v3f(-100, 120, -100);
 479         wield_position.Y += fabs(m_wield_change_timer)*320 - 40;
 480         if(m_digging_anim < 0.05 || m_digging_anim > 0.5)
 481         {
 482                 f32 frac = 1.0;
 483                 if(m_digging_anim > 0.5)
 484                         frac = 2.0 * (m_digging_anim - 0.5);
 485                 // This value starts from 1 and settles to 0
 486                 f32 ratiothing = std::pow((1.0f - tool_reload_ratio), 0.5f);
 487                 //f32 ratiothing2 = pow(ratiothing, 0.5f);
 488                 f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
 489                 wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
 490                 //wield_position.Z += frac * 5.0 * ratiothing2;
 491                 wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
 492                 wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
 493                 //wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
 494                 //wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
 495         }
 496         if (m_digging_button != -1)
 497         {
 498                 f32 digfrac = m_digging_anim;
 499                 wield_position.X -= 50 * sin(pow(digfrac, 0.8f) * M_PI);
 500                 wield_position.Y += 24 * sin(digfrac * 1.8 * M_PI);
 501                 wield_position.Z += 25 * 0.5;
 502
 503                 // Euler angles are PURE EVIL, so why not use quaternions?
 504                 core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
 505                 core::quaternion quat_end(v3f(80, 30, 100) * core::DEGTORAD);
 506                 core::quaternion quat_slerp;
 507                 quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * M_PI));
 508                 quat_slerp.toEuler(wield_rotation);
 509                 wield_rotation *= core::RADTODEG;
 510         } else {
 511                 f32 bobfrac = my_modf(m_view_bobbing_anim);
 512                 wield_position.X -= sin(bobfrac*M_PI*2.0) * 3.0;
 513                 wield_position.Y += sin(my_modf(bobfrac*2.0)*M_PI) * 3.0;
 514         }
 515         m_wieldnode->setPosition(wield_position);
 516         m_wieldnode->setRotation(wield_rotation);
 517
 518         m_wieldnode->setColor(player->light_color);
 519
 520         // Set render distance
 521         updateViewingRange();
 522
 523         // If the player is walking, swimming, or climbing,
 524         // view bobbing is enabled and free_move is off,
 525         // start (or continue) the view bobbing animation.
 526         const v3f &speed = player->getSpeed();
 527         const bool movement_XZ = hypot(speed.X, speed.Z) > BS;
 528         const bool movement_Y = fabs(speed.Y) > BS;
 529
 530         const bool walking = movement_XZ && player->touching_ground;
 531         const bool swimming = (movement_XZ || player->swimming_vertical) && player->in_liquid;
 532         const bool climbing = movement_Y && player->is_climbing;
 533         if ((walking || swimming || climbing) &&
 534                         (!g_settings->getBool("free_move") || !m_client->checkLocalPrivilege("fly"))) {
 535                 // Start animation
 536                 m_view_bobbing_state = 1;
 537                 m_view_bobbing_speed = MYMIN(speed.getLength(), 70);
 538         }
 539         else if (m_view_bobbing_state == 1)
 540         {
 541                 // Stop animation
 542                 m_view_bobbing_state = 2;
 543                 m_view_bobbing_speed = 60;
 544         }
 545 }
 546
 547 void Camera::updateViewingRange()
 548 {
 549         f32 viewing_range = g_settings->getFloat("viewing_range");
 550         f32 near_plane = g_settings->getFloat("near_plane");
 551
 552         m_draw_control.wanted_range = std::fmin(adjustDist(viewing_range, getFovMax()), 4000);
 553         m_cameranode->setNearValue(rangelim(near_plane, 0.0f, 0.5f) * BS);
 554         if (m_draw_control.range_all) {
 555                 m_cameranode->setFarValue(100000.0);
 556                 return;
 557         }
 558         m_cameranode->setFarValue((viewing_range < 2000) ? 2000 * BS : viewing_range * BS);
 559 }
 560
 561 void Camera::setDigging(s32 button)
 562 {
 563         if (m_digging_button == -1)
 564                 m_digging_button = button;
 565 }
 566
 567 void Camera::wield(const ItemStack &item)
 568 {
 569         if (item.name != m_wield_item_next.name ||
 570                         item.metadata != m_wield_item_next.metadata) {
 571                 m_wield_item_next = item;
 572                 if (m_wield_change_timer > 0)
 573                         m_wield_change_timer = -m_wield_change_timer;
 574                 else if (m_wield_change_timer == 0)
 575                         m_wield_change_timer = -0.001;
 576         }
 577 }
 578
 579 void Camera::drawWieldedTool(irr::core::matrix4* translation)
 580 {
 581         // Clear Z buffer so that the wielded tool stay in front of world geometry
 582         m_wieldmgr->getVideoDriver()->clearZBuffer();
 583
 584         // Draw the wielded node (in a separate scene manager)
 585         scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
 586         cam->setAspectRatio(m_cameranode->getAspectRatio());
 587         cam->setFOV(72.0*M_PI/180.0);
 588         cam->setNearValue(10);
 589         cam->setFarValue(1000);
 590         if (translation != NULL)
 591         {
 592                 irr::core::matrix4 startMatrix = cam->getAbsoluteTransformation();
 593                 irr::core::vector3df focusPoint = (cam->getTarget()
 594                                 - cam->getAbsolutePosition()).setLength(1)
 595                                 + cam->getAbsolutePosition();
 596
 597                 irr::core::vector3df camera_pos =
 598                                 (startMatrix * *translation).getTranslation();
 599                 cam->setPosition(camera_pos);
 600                 cam->setTarget(focusPoint);
 601         }
 602         m_wieldmgr->drawAll();
 603 }
 604
 605 void Camera::drawNametags()
 606 {
 607         core::matrix4 trans = m_cameranode->getProjectionMatrix();
 608         trans *= m_cameranode->getViewMatrix();
 609
 610         for (std::list<Nametag *>::const_iterator
 611                         i = m_nametags.begin();
 612                         i != m_nametags.end(); ++i) {
 613                 Nametag *nametag = *i;
 614                 if (nametag->nametag_color.getAlpha() == 0) {
 615                         // Enforce hiding nametag,
 616                         // because if freetype is enabled, a grey
 617                         // shadow can remain.
 618                         continue;
 619                 }
 620                 v3f pos = nametag->parent_node->getAbsolutePosition() + nametag->nametag_pos * BS;
 621                 f32 transformed_pos[4] = { pos.X, pos.Y, pos.Z, 1.0f };
 622                 trans.multiplyWith1x4Matrix(transformed_pos);
 623                 if (transformed_pos[3] > 0) {
 624                         std::wstring nametag_colorless =
 625                                 unescape_translate(utf8_to_wide(nametag->nametag_text));
 626                         core::dimension2d<u32> textsize =
 627                                 g_fontengine->getFont()->getDimension(
 628                                 nametag_colorless.c_str());
 629                         f32 zDiv = transformed_pos[3] == 0.0f ? 1.0f :
 630                                 core::reciprocal(transformed_pos[3]);
 631                         v2u32 screensize = RenderingEngine::get_video_driver()->getScreenSize();
 632                         v2s32 screen_pos;
 633                         screen_pos.X = screensize.X *
 634                                 (0.5 * transformed_pos[0] * zDiv + 0.5) - textsize.Width / 2;
 635                         screen_pos.Y = screensize.Y *
 636                                 (0.5 - transformed_pos[1] * zDiv * 0.5) - textsize.Height / 2;
 637                         core::rect<s32> size(0, 0, textsize.Width, textsize.Height);
 638                         g_fontengine->getFont()->draw(
 639                                 translate_string(utf8_to_wide(nametag->nametag_text)).c_str(),
 640                                 size + screen_pos, nametag->nametag_color);
 641                 }
 642         }
 643 }
 644
 645 Nametag *Camera::addNametag(scene::ISceneNode *parent_node,
 646                 const std::string &nametag_text, video::SColor nametag_color,
 647                 const v3f &pos)
 648 {
 649         Nametag *nametag = new Nametag(parent_node, nametag_text, nametag_color, pos);
 650         m_nametags.push_back(nametag);
 651         return nametag;
 652 }
 653
 654 void Camera::removeNametag(Nametag *nametag)
 655 {
 656         m_nametags.remove(nametag);
 657         delete nametag;
 658 }