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 "profiler.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
  41 Camera::Camera(MapDrawControl &draw_control, Client *client):
  42         m_draw_control(draw_control),
  43         m_client(client)
  44 {
  45         scene::ISceneManager *smgr = RenderingEngine::get_scene_manager();
  46         // note: making the camera node a child of the player node
  47         // would lead to unexpected behaviour, so we don't do that.
  48         m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
  49         m_headnode = smgr->addEmptySceneNode(m_playernode);
  50         m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
  51         m_cameranode->bindTargetAndRotation(true);
  52
  53         // This needs to be in its own scene manager. It is drawn after
  54         // all other 3D scene nodes and before the GUI.
  55         m_wieldmgr = smgr->createNewSceneManager();
  56         m_wieldmgr->addCameraSceneNode();
  57         m_wieldnode = new WieldMeshSceneNode(m_wieldmgr, -1, false);
  58         m_wieldnode->setItem(ItemStack(), m_client);
  59         m_wieldnode->drop(); // m_wieldmgr grabbed it
  60
  61         /* TODO: Add a callback function so these can be updated when a setting
  62          *       changes.  At this point in time it doesn't matter (e.g. /set
  63          *       is documented to change server settings only)
  64          *
  65          * TODO: Local caching of settings is not optimal and should at some stage
  66          *       be updated to use a global settings object for getting thse values
  67          *       (as opposed to the this local caching). This can be addressed in
  68          *       a later release.
  69          */
  70         m_cache_fall_bobbing_amount = g_settings->getFloat("fall_bobbing_amount");
  71         m_cache_view_bobbing_amount = g_settings->getFloat("view_bobbing_amount");
  72         m_cache_fov                 = g_settings->getFloat("fov");
  73         m_cache_zoom_fov            = g_settings->getFloat("zoom_fov");
  74         m_arm_inertia               = g_settings->getBool("arm_inertia");
  75         m_nametags.clear();
  76 }
  77
  78 Camera::~Camera()
  79 {
  80         m_wieldmgr->drop();
  81 }
  82
  83 bool Camera::successfullyCreated(std::string &error_message)
  84 {
  85         if (!m_playernode) {
  86                 error_message = "Failed to create the player scene node";
  87         } else if (!m_headnode) {
  88                 error_message = "Failed to create the head scene node";
  89         } else if (!m_cameranode) {
  90                 error_message = "Failed to create the camera scene node";
  91         } else if (!m_wieldmgr) {
  92                 error_message = "Failed to create the wielded item scene manager";
  93         } else if (!m_wieldnode) {
  94                 error_message = "Failed to create the wielded item scene node";
  95         } else {
  96                 error_message.clear();
  97         }
  98
  99         if (g_settings->getBool("enable_client_modding")) {
 100                 m_client->getScript()->on_camera_ready(this);
 101         }
 102         return error_message.empty();
 103 }
 104
 105 // Returns the fractional part of x
 106 inline f32 my_modf(f32 x)
 107 {
 108         double dummy;
 109         return modf(x, &dummy);
 110 }
 111
 112 void Camera::step(f32 dtime)
 113 {
 114         if(m_view_bobbing_fall > 0)
 115         {
 116                 m_view_bobbing_fall -= 3 * dtime;
 117                 if(m_view_bobbing_fall <= 0)
 118                         m_view_bobbing_fall = -1; // Mark the effect as finished
 119         }
 120
 121         bool was_under_zero = m_wield_change_timer < 0;
 122         m_wield_change_timer = MYMIN(m_wield_change_timer + dtime, 0.125);
 123
 124         if (m_wield_change_timer >= 0 && was_under_zero)
 125                 m_wieldnode->setItem(m_wield_item_next, m_client);
 126
 127         if (m_view_bobbing_state != 0)
 128         {
 129                 //f32 offset = dtime * m_view_bobbing_speed * 0.035;
 130                 f32 offset = dtime * m_view_bobbing_speed * 0.030;
 131                 if (m_view_bobbing_state == 2) {
 132                         // Animation is getting turned off
 133                         if (m_view_bobbing_anim < 0.25) {
 134                                 m_view_bobbing_anim -= offset;
 135                         } else if (m_view_bobbing_anim > 0.75) {
 136                                 m_view_bobbing_anim += offset;
 137                         }
 138
 139                         if (m_view_bobbing_anim < 0.5) {
 140                                 m_view_bobbing_anim += offset;
 141                                 if (m_view_bobbing_anim > 0.5)
 142                                         m_view_bobbing_anim = 0.5;
 143                         } else {
 144                                 m_view_bobbing_anim -= offset;
 145                                 if (m_view_bobbing_anim < 0.5)
 146                                         m_view_bobbing_anim = 0.5;
 147                         }
 148
 149                         if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
 150                                         fabs(m_view_bobbing_anim - 0.5) < 0.01) {
 151                                 m_view_bobbing_anim = 0;
 152                                 m_view_bobbing_state = 0;
 153                         }
 154                 }
 155                 else {
 156                         float was = m_view_bobbing_anim;
 157                         m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
 158                         bool step = (was == 0 ||
 159                                         (was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
 160                                         (was > 0.5f && m_view_bobbing_anim <= 0.5f));
 161                         if(step) {
 162                                 MtEvent *e = new SimpleTriggerEvent("ViewBobbingStep");
 163                                 m_client->event()->put(e);
 164                         }
 165                 }
 166         }
 167
 168         if (m_digging_button != -1)
 169         {
 170                 f32 offset = dtime * 3.5;
 171                 float m_digging_anim_was = m_digging_anim;
 172                 m_digging_anim += offset;
 173                 if (m_digging_anim >= 1)
 174                 {
 175                         m_digging_anim = 0;
 176                         m_digging_button = -1;
 177                 }
 178                 float lim = 0.15;
 179                 if(m_digging_anim_was < lim && m_digging_anim >= lim)
 180                 {
 181                         if(m_digging_button == 0)
 182                         {
 183                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchLeft");
 184                                 m_client->event()->put(e);
 185                         } else if(m_digging_button == 1) {
 186                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchRight");
 187                                 m_client->event()->put(e);
 188                         }
 189                 }
 190         }
 191 }
 192
 193 static inline v2f dir(const v2f &pos_dist)
 194 {
 195         f32 x = pos_dist.X - 55.0f;
 196         f32 y = pos_dist.Y + 35.0f;
 197
 198         f32 x_abs = std::fabs(x);
 199         f32 y_abs = std::fabs(y);
 200
 201         if (x_abs >= y_abs) {
 202                 y *= (1.0f / x_abs);
 203                 x /= x_abs;
 204         }
 205
 206         if (y_abs >= x_abs) {
 207                 x *= (1.0f / y_abs);
 208                 y /= y_abs;
 209         }
 210
 211         return v2f(std::fabs(x), std::fabs(y));
 212 }
 213
 214 void Camera::addArmInertia(f32 player_yaw, f32 frametime)
 215 {
 216         m_cam_vel.X = std::fabs((m_last_cam_pos.X - player_yaw) / frametime) * 0.01f;
 217         m_cam_vel.Y = std::fabs((m_last_cam_pos.Y - m_camera_direction.Y) / frametime);
 218
 219         if (m_cam_vel.X > 1.0f || m_cam_vel.Y > 1.0f) {
 220                 /*
 221                     The arm moves relative to the camera speed,
 222                     with an acceleration factor.
 223                 */
 224
 225                 if (m_cam_vel.X > 1.0f) {
 226                         if (m_cam_vel.X > m_cam_vel_old.X)
 227                                 m_cam_vel_old.X = m_cam_vel.X;
 228
 229                         if (m_last_cam_pos.X > player_yaw) {
 230                                 // right
 231                                 m_cam_vel.X -= std::fabs(55.0f - m_wieldmesh_offset.X) * 0.1f;
 232                                 m_wieldmesh_offset.X -= (0.1f + frametime) * m_cam_vel.X;
 233                         } else {
 234                                 // left
 235                                 m_cam_vel.X += std::fabs(55.0f - m_wieldmesh_offset.X) * 0.1f;
 236                                 m_wieldmesh_offset.X += (0.1f + frametime) * m_cam_vel.X;
 237                         }
 238
 239                         if (m_last_cam_pos.X != player_yaw)
 240                                 m_last_cam_pos.X = player_yaw;
 241
 242                         m_wieldmesh_offset.X = rangelim(m_wieldmesh_offset.X, 48.0f, 62.0f);
 243                 }
 244
 245                 if (m_cam_vel.Y > 1.0f) {
 246                         if (m_cam_vel.Y > m_cam_vel_old.Y)
 247                                 m_cam_vel_old.Y = m_cam_vel.Y;
 248
 249                         if (m_last_cam_pos.Y > m_camera_direction.Y) {
 250                                 // down
 251                                 m_cam_vel.Y -= std::fabs(-35.0f - m_wieldmesh_offset.Y) * 0.1f;
 252                                 m_wieldmesh_offset.Y += (0.1f + frametime) * m_cam_vel.Y;
 253                         } else {
 254                                 // up
 255                                 m_cam_vel.Y += std::fabs(-35.0f - m_wieldmesh_offset.Y) * 0.1f;
 256                                 m_wieldmesh_offset.Y -= (0.1f + frametime) * m_cam_vel.Y;
 257                         }
 258
 259                         if (m_last_cam_pos.Y != m_camera_direction.Y)
 260                                 m_last_cam_pos.Y = m_camera_direction.Y;
 261
 262                         m_wieldmesh_offset.Y = rangelim(m_wieldmesh_offset.Y, -45.0f, -30.0f);
 263                 }
 264
 265                 m_arm_dir = dir(m_wieldmesh_offset);
 266         } else {
 267                 /*
 268                     Now the arm gets back to its default position when the camera stops,
 269                     following a vector, with a smooth deceleration factor.
 270                 */
 271
 272                 f32 acc_X = (m_cam_vel_old.X * (1.0f + (1.0f - m_arm_dir.X))) /
 273                         (20.0f / std::fabs(55.0f - m_wieldmesh_offset.X));
 274                 f32 acc_Y = (m_cam_vel_old.Y * (1.0f + (1.0f - m_arm_dir.Y))) /
 275                         (15.0f / std::fabs(-35.0f - m_wieldmesh_offset.Y));
 276
 277                 if (std::fabs(55.0f - m_wieldmesh_offset.X) < 0.1f)
 278                         m_cam_vel_old.X = 0.0f;
 279
 280                 if (m_wieldmesh_offset.X > 55.0f)
 281                         m_wieldmesh_offset.X -= (0.2f + frametime) * acc_X;
 282
 283                 if (m_wieldmesh_offset.X < 55.0f)
 284                         m_wieldmesh_offset.X += (0.2f + frametime) * acc_X;
 285
 286                 if (std::fabs(-35.0f - m_wieldmesh_offset.Y) < 0.1f)
 287                         m_cam_vel_old.Y = 0.0f;
 288
 289                 if (m_wieldmesh_offset.Y > -35.0f)
 290                         m_wieldmesh_offset.Y -= (0.1f + frametime) * acc_Y;
 291
 292                 if (m_wieldmesh_offset.Y < -35.0f)
 293                         m_wieldmesh_offset.Y += (0.1f + frametime) * acc_Y;
 294         }
 295 }
 296
 297 void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
 298                 f32 tool_reload_ratio, ClientEnvironment &c_env)
 299 {
 300         // Get player position
 301         // Smooth the movement when walking up stairs
 302         v3f old_player_position = m_playernode->getPosition();
 303         v3f player_position = player->getPosition();
 304         if (player->isAttached && player->parent)
 305                 player_position = player->parent->getPosition();
 306         //if(player->touching_ground && player_position.Y > old_player_position.Y)
 307         if(player->touching_ground &&
 308                         player_position.Y > old_player_position.Y)
 309         {
 310                 f32 oldy = old_player_position.Y;
 311                 f32 newy = player_position.Y;
 312                 f32 t = exp(-23*frametime);
 313                 player_position.Y = oldy * t + newy * (1-t);
 314         }
 315
 316         // Set player node transformation
 317         m_playernode->setPosition(player_position);
 318         m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
 319         m_playernode->updateAbsolutePosition();
 320
 321         // Get camera tilt timer (hurt animation)
 322         float cameratilt = fabs(fabs(player->hurt_tilt_timer-0.75)-0.75);
 323
 324         // Fall bobbing animation
 325         float fall_bobbing = 0;
 326         if(player->camera_impact >= 1 && m_camera_mode < CAMERA_MODE_THIRD)
 327         {
 328                 if(m_view_bobbing_fall == -1) // Effect took place and has finished
 329                         player->camera_impact = m_view_bobbing_fall = 0;
 330                 else if(m_view_bobbing_fall == 0) // Initialize effect
 331                         m_view_bobbing_fall = 1;
 332
 333                 // Convert 0 -> 1 to 0 -> 1 -> 0
 334                 fall_bobbing = m_view_bobbing_fall < 0.5 ? m_view_bobbing_fall * 2 : -(m_view_bobbing_fall - 0.5) * 2 + 1;
 335                 // Smoothen and invert the above
 336                 fall_bobbing = sin(fall_bobbing * 0.5 * M_PI) * -1;
 337                 // Amplify according to the intensity of the impact
 338                 fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;
 339
 340                 fall_bobbing *= m_cache_fall_bobbing_amount;
 341         }
 342
 343         // Calculate players eye offset for different camera modes
 344         v3f PlayerEyeOffset = player->getEyeOffset();
 345         if (m_camera_mode == CAMERA_MODE_FIRST)
 346                 PlayerEyeOffset += player->eye_offset_first;
 347         else
 348                 PlayerEyeOffset += player->eye_offset_third;
 349
 350         // Set head node transformation
 351         m_headnode->setPosition(PlayerEyeOffset+v3f(0,cameratilt*-player->hurt_tilt_strength+fall_bobbing,0));
 352         m_headnode->setRotation(v3f(player->getPitch(), 0, cameratilt*player->hurt_tilt_strength));
 353         m_headnode->updateAbsolutePosition();
 354
 355         // Compute relative camera position and target
 356         v3f rel_cam_pos = v3f(0,0,0);
 357         v3f rel_cam_target = v3f(0,0,1);
 358         v3f rel_cam_up = v3f(0,1,0);
 359
 360         if (m_cache_view_bobbing_amount != 0.0f && m_view_bobbing_anim != 0.0f &&
 361                 m_camera_mode < CAMERA_MODE_THIRD) {
 362                 f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
 363                 f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;
 364
 365                 #if 1
 366                 f32 bobknob = 1.2;
 367                 f32 bobtmp = sin(pow(bobfrac, bobknob) * M_PI);
 368                 //f32 bobtmp2 = cos(pow(bobfrac, bobknob) * M_PI);
 369
 370                 v3f bobvec = v3f(
 371                         0.3 * bobdir * sin(bobfrac * M_PI),
 372                         -0.28 * bobtmp * bobtmp,
 373                         0.);
 374
 375                 //rel_cam_pos += 0.2 * bobvec;
 376                 //rel_cam_target += 0.03 * bobvec;
 377                 //rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * M_PI);
 378                 float f = 1.0;
 379                 f *= m_cache_view_bobbing_amount;
 380                 rel_cam_pos += bobvec * f;
 381                 //rel_cam_target += 0.995 * bobvec * f;
 382                 rel_cam_target += bobvec * f;
 383                 rel_cam_target.Z -= 0.005 * bobvec.Z * f;
 384                 //rel_cam_target.X -= 0.005 * bobvec.X * f;
 385                 //rel_cam_target.Y -= 0.005 * bobvec.Y * f;
 386                 rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * M_PI * f);
 387                 #else
 388                 f32 angle_deg = 1 * bobdir * sin(bobfrac * M_PI);
 389                 f32 angle_rad = angle_deg * M_PI / 180;
 390                 f32 r = 0.05;
 391                 v3f off = v3f(
 392                         r * sin(angle_rad),
 393                         r * (cos(angle_rad) - 1),
 394                         0);
 395                 rel_cam_pos += off;
 396                 //rel_cam_target += off;
 397                 rel_cam_up.rotateXYBy(angle_deg);
 398                 #endif
 399
 400         }
 401
 402         // Compute absolute camera position and target
 403         m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
 404         m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);
 405
 406         v3f abs_cam_up;
 407         m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 408
 409         // Seperate camera position for calculation
 410         v3f my_cp = m_camera_position;
 411
 412         // Reposition the camera for third person view
 413         if (m_camera_mode > CAMERA_MODE_FIRST)
 414         {
 415                 if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 416                         m_camera_direction *= -1;
 417
 418                 my_cp.Y += 2;
 419
 420                 // Calculate new position
 421                 bool abort = false;
 422                 for (int i = BS; i <= BS*2.75; i++)
 423                 {
 424                         my_cp.X = m_camera_position.X + m_camera_direction.X*-i;
 425                         my_cp.Z = m_camera_position.Z + m_camera_direction.Z*-i;
 426                         if (i > 12)
 427                                 my_cp.Y = m_camera_position.Y + (m_camera_direction.Y*-i);
 428
 429                         // Prevent camera positioned inside nodes
 430                         INodeDefManager *nodemgr = m_client->ndef();
 431                         MapNode n = c_env.getClientMap().getNodeNoEx(floatToInt(my_cp, BS));
 432                         const ContentFeatures& features = nodemgr->get(n);
 433                         if(features.walkable)
 434                         {
 435                                 my_cp.X += m_camera_direction.X*-1*-BS/2;
 436                                 my_cp.Z += m_camera_direction.Z*-1*-BS/2;
 437                                 my_cp.Y += m_camera_direction.Y*-1*-BS/2;
 438                                 abort = true;
 439                                 break;
 440                         }
 441                 }
 442
 443                 // If node blocks camera position don't move y to heigh
 444                 if (abort && my_cp.Y > player_position.Y+BS*2)
 445                         my_cp.Y = player_position.Y+BS*2;
 446         }
 447
 448         // Update offset if too far away from the center of the map
 449         m_camera_offset.X += CAMERA_OFFSET_STEP*
 450                         (((s16)(my_cp.X/BS) - m_camera_offset.X)/CAMERA_OFFSET_STEP);
 451         m_camera_offset.Y += CAMERA_OFFSET_STEP*
 452                         (((s16)(my_cp.Y/BS) - m_camera_offset.Y)/CAMERA_OFFSET_STEP);
 453         m_camera_offset.Z += CAMERA_OFFSET_STEP*
 454                         (((s16)(my_cp.Z/BS) - m_camera_offset.Z)/CAMERA_OFFSET_STEP);
 455
 456         // Set camera node transformation
 457         m_cameranode->setPosition(my_cp-intToFloat(m_camera_offset, BS));
 458         m_cameranode->setUpVector(abs_cam_up);
 459         // *100.0 helps in large map coordinates
 460         m_cameranode->setTarget(my_cp-intToFloat(m_camera_offset, BS) + 100 * m_camera_direction);
 461
 462         // update the camera position in front-view mode to render blocks behind player
 463         if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 464                 m_camera_position = my_cp;
 465
 466         // Get FOV
 467         f32 fov_degrees;
 468         if (player->getPlayerControl().zoom && m_client->checkLocalPrivilege("zoom")) {
 469                 fov_degrees = m_cache_zoom_fov;
 470         } else {
 471                 fov_degrees = m_cache_fov;
 472         }
 473         fov_degrees = rangelim(fov_degrees, 7.0, 160.0);
 474
 475         // FOV and aspect ratio
 476         const v2u32 &window_size = RenderingEngine::get_instance()->getWindowSize();
 477         m_aspect = (f32) window_size.X / (f32) window_size.Y;
 478         m_fov_y = fov_degrees * M_PI / 180.0;
 479         // Increase vertical FOV on lower aspect ratios (<16:10)
 480         m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
 481         m_fov_x = 2 * atan(m_aspect * tan(0.5 * m_fov_y));
 482         m_cameranode->setAspectRatio(m_aspect);
 483         m_cameranode->setFOV(m_fov_y);
 484
 485         if (m_arm_inertia && frametime > 0.0f)
 486                 addArmInertia(player->getYaw(), frametime);
 487
 488         // Position the wielded item
 489         //v3f wield_position = v3f(45, -35, 65);
 490         v3f wield_position = v3f(m_wieldmesh_offset.X, m_wieldmesh_offset.Y, 65);
 491         //v3f wield_rotation = v3f(-100, 120, -100);
 492         v3f wield_rotation = v3f(-100, 120, -100);
 493         wield_position.Y += fabs(m_wield_change_timer)*320 - 40;
 494         if(m_digging_anim < 0.05 || m_digging_anim > 0.5)
 495         {
 496                 f32 frac = 1.0;
 497                 if(m_digging_anim > 0.5)
 498                         frac = 2.0 * (m_digging_anim - 0.5);
 499                 // This value starts from 1 and settles to 0
 500                 f32 ratiothing = pow((1.0f - tool_reload_ratio), 0.5f);
 501                 //f32 ratiothing2 = pow(ratiothing, 0.5f);
 502                 f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
 503                 wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
 504                 //wield_position.Z += frac * 5.0 * ratiothing2;
 505                 wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
 506                 wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
 507                 //wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
 508                 //wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
 509         }
 510         if (m_digging_button != -1)
 511         {
 512                 f32 digfrac = m_digging_anim;
 513                 wield_position.X -= 50 * sin(pow(digfrac, 0.8f) * M_PI);
 514                 wield_position.Y += 24 * sin(digfrac * 1.8 * M_PI);
 515                 wield_position.Z += 25 * 0.5;
 516
 517                 // Euler angles are PURE EVIL, so why not use quaternions?
 518                 core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
 519                 core::quaternion quat_end(v3f(80, 30, 100) * core::DEGTORAD);
 520                 core::quaternion quat_slerp;
 521                 quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * M_PI));
 522                 quat_slerp.toEuler(wield_rotation);
 523                 wield_rotation *= core::RADTODEG;
 524         } else {
 525                 f32 bobfrac = my_modf(m_view_bobbing_anim);
 526                 wield_position.X -= sin(bobfrac*M_PI*2.0) * 3.0;
 527                 wield_position.Y += sin(my_modf(bobfrac*2.0)*M_PI) * 3.0;
 528         }
 529         m_wieldnode->setPosition(wield_position);
 530         m_wieldnode->setRotation(wield_rotation);
 531
 532         m_wieldnode->setColor(player->light_color);
 533
 534         // Set render distance
 535         updateViewingRange();
 536
 537         // If the player is walking, swimming, or climbing,
 538         // view bobbing is enabled and free_move is off,
 539         // start (or continue) the view bobbing animation.
 540         v3f speed = player->getSpeed();
 541         const bool movement_XZ = hypot(speed.X, speed.Z) > BS;
 542         const bool movement_Y = fabs(speed.Y) > BS;
 543
 544         const bool walking = movement_XZ && player->touching_ground;
 545         const bool swimming = (movement_XZ || player->swimming_vertical) && player->in_liquid;
 546         const bool climbing = movement_Y && player->is_climbing;
 547         if ((walking || swimming || climbing) &&
 548                         (!g_settings->getBool("free_move") || !m_client->checkLocalPrivilege("fly"))) {
 549                 // Start animation
 550                 m_view_bobbing_state = 1;
 551                 m_view_bobbing_speed = MYMIN(speed.getLength(), 70);
 552         }
 553         else if (m_view_bobbing_state == 1)
 554         {
 555                 // Stop animation
 556                 m_view_bobbing_state = 2;
 557                 m_view_bobbing_speed = 60;
 558         }
 559 }
 560
 561 void Camera::updateViewingRange()
 562 {
 563         f32 viewing_range = g_settings->getFloat("viewing_range");
 564         m_draw_control.wanted_range = viewing_range;
 565         if (m_draw_control.range_all) {
 566                 m_cameranode->setFarValue(100000.0);
 567                 return;
 568         }
 569         m_cameranode->setFarValue((viewing_range < 2000) ? 2000 * BS : viewing_range * BS);
 570 }
 571
 572 void Camera::setDigging(s32 button)
 573 {
 574         if (m_digging_button == -1)
 575                 m_digging_button = button;
 576 }
 577
 578 void Camera::wield(const ItemStack &item)
 579 {
 580         if (item.name != m_wield_item_next.name ||
 581                         item.metadata != m_wield_item_next.metadata) {
 582                 m_wield_item_next = item;
 583                 if (m_wield_change_timer > 0)
 584                         m_wield_change_timer = -m_wield_change_timer;
 585                 else if (m_wield_change_timer == 0)
 586                         m_wield_change_timer = -0.001;
 587         }
 588 }
 589
 590 void Camera::drawWieldedTool(irr::core::matrix4* translation)
 591 {
 592         // Clear Z buffer so that the wielded tool stay in front of world geometry
 593         m_wieldmgr->getVideoDriver()->clearZBuffer();
 594
 595         // Draw the wielded node (in a separate scene manager)
 596         scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
 597         cam->setAspectRatio(m_cameranode->getAspectRatio());
 598         cam->setFOV(72.0*M_PI/180.0);
 599         cam->setNearValue(10);
 600         cam->setFarValue(1000);
 601         if (translation != NULL)
 602         {
 603                 irr::core::matrix4 startMatrix = cam->getAbsoluteTransformation();
 604                 irr::core::vector3df focusPoint = (cam->getTarget()
 605                                 - cam->getAbsolutePosition()).setLength(1)
 606                                 + cam->getAbsolutePosition();
 607
 608                 irr::core::vector3df camera_pos =
 609                                 (startMatrix * *translation).getTranslation();
 610                 cam->setPosition(camera_pos);
 611                 cam->setTarget(focusPoint);
 612         }
 613         m_wieldmgr->drawAll();
 614 }
 615
 616 void Camera::drawNametags()
 617 {
 618         core::matrix4 trans = m_cameranode->getProjectionMatrix();
 619         trans *= m_cameranode->getViewMatrix();
 620
 621         for (std::list<Nametag *>::const_iterator
 622                         i = m_nametags.begin();
 623                         i != m_nametags.end(); ++i) {
 624                 Nametag *nametag = *i;
 625                 if (nametag->nametag_color.getAlpha() == 0) {
 626                         // Enforce hiding nametag,
 627                         // because if freetype is enabled, a grey
 628                         // shadow can remain.
 629                         continue;
 630                 }
 631                 v3f pos = nametag->parent_node->getAbsolutePosition() + v3f(0.0, 1.1 * BS, 0.0);
 632                 f32 transformed_pos[4] = { pos.X, pos.Y, pos.Z, 1.0f };
 633                 trans.multiplyWith1x4Matrix(transformed_pos);
 634                 if (transformed_pos[3] > 0) {
 635                         std::string nametag_colorless = unescape_enriched(nametag->nametag_text);
 636                         core::dimension2d<u32> textsize =
 637                                 g_fontengine->getFont()->getDimension(
 638                                 utf8_to_wide(nametag_colorless).c_str());
 639                         f32 zDiv = transformed_pos[3] == 0.0f ? 1.0f :
 640                                 core::reciprocal(transformed_pos[3]);
 641                         v2u32 screensize = RenderingEngine::get_video_driver()->getScreenSize();
 642                         v2s32 screen_pos;
 643                         screen_pos.X = screensize.X *
 644                                 (0.5 * transformed_pos[0] * zDiv + 0.5) - textsize.Width / 2;
 645                         screen_pos.Y = screensize.Y *
 646                                 (0.5 - transformed_pos[1] * zDiv * 0.5) - textsize.Height / 2;
 647                         core::rect<s32> size(0, 0, textsize.Width, textsize.Height);
 648                         g_fontengine->getFont()->draw(utf8_to_wide(nametag->nametag_text).c_str(),
 649                                         size + screen_pos, nametag->nametag_color);
 650                 }
 651         }
 652 }
 653
 654 Nametag *Camera::addNametag(scene::ISceneNode *parent_node,
 655                 std::string nametag_text, video::SColor nametag_color)
 656 {
 657         Nametag *nametag = new Nametag(parent_node, nametag_text, nametag_color);
 658         m_nametags.push_back(nametag);
 659         return nametag;
 660 }
 661
 662 void Camera::removeNametag(Nametag *nametag)
 663 {
 664         m_nametags.remove(nametag);
 665         delete nametag;
 666 }