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