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_view_bobbing_anim(0),
  64         m_view_bobbing_state(0),
  65         m_view_bobbing_speed(0),
  66         m_view_bobbing_fall(0),
  67
  68         m_digging_anim(0),
  69         m_digging_button(-1),
  70
  71         m_wield_change_timer(0.125),
  72         m_wield_item_next(),
  73
  74         m_camera_mode(CAMERA_MODE_FIRST)
  75 {
  76         //dstream<<FUNCTION_NAME<<std::endl;
  77
  78         m_driver = smgr->getVideoDriver();
  79         // note: making the camera node a child of the player node
  80         // would lead to unexpected behaviour, so we don't do that.
  81         m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
  82         m_headnode = smgr->addEmptySceneNode(m_playernode);
  83         m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
  84         m_cameranode->bindTargetAndRotation(true);
  85
  86         // This needs to be in its own scene manager. It is drawn after
  87         // all other 3D scene nodes and before the GUI.
  88         m_wieldmgr = smgr->createNewSceneManager();
  89         m_wieldmgr->addCameraSceneNode();
  90         m_wieldnode = new WieldMeshSceneNode(m_wieldmgr->getRootSceneNode(), m_wieldmgr, -1, false);
  91         m_wieldnode->setItem(ItemStack(), m_gamedef);
  92         m_wieldnode->drop(); // m_wieldmgr grabbed it
  93
  94         /* TODO: Add a callback function so these can be updated when a setting
  95          *       changes.  At this point in time it doesn't matter (e.g. /set
  96          *       is documented to change server settings only)
  97          *
  98          * TODO: Local caching of settings is not optimal and should at some stage
  99          *       be updated to use a global settings object for getting thse values
 100          *       (as opposed to the this local caching). This can be addressed in
 101          *       a later release.
 102          */
 103         m_cache_fall_bobbing_amount = g_settings->getFloat("fall_bobbing_amount");
 104         m_cache_view_bobbing_amount = g_settings->getFloat("view_bobbing_amount");
 105         m_cache_fov                 = g_settings->getFloat("fov");
 106         m_cache_zoom_fov            = g_settings->getFloat("zoom_fov");
 107         m_cache_view_bobbing        = g_settings->getBool("view_bobbing");
 108         m_nametags.clear();
 109 }
 110
 111 Camera::~Camera()
 112 {
 113         m_wieldmgr->drop();
 114 }
 115
 116 bool Camera::successfullyCreated(std::string &error_message)
 117 {
 118         if (!m_playernode) {
 119                 error_message = "Failed to create the player scene node";
 120         } else if (!m_headnode) {
 121                 error_message = "Failed to create the head scene node";
 122         } else if (!m_cameranode) {
 123                 error_message = "Failed to create the camera scene node";
 124         } else if (!m_wieldmgr) {
 125                 error_message = "Failed to create the wielded item scene manager";
 126         } else if (!m_wieldnode) {
 127                 error_message = "Failed to create the wielded item scene node";
 128         } else {
 129                 error_message.clear();
 130         }
 131         return error_message.empty();
 132 }
 133
 134 // Returns the fractional part of x
 135 inline f32 my_modf(f32 x)
 136 {
 137         double dummy;
 138         return modf(x, &dummy);
 139 }
 140
 141 void Camera::step(f32 dtime)
 142 {
 143         if(m_view_bobbing_fall > 0)
 144         {
 145                 m_view_bobbing_fall -= 3 * dtime;
 146                 if(m_view_bobbing_fall <= 0)
 147                         m_view_bobbing_fall = -1; // Mark the effect as finished
 148         }
 149
 150         bool was_under_zero = m_wield_change_timer < 0;
 151         m_wield_change_timer = MYMIN(m_wield_change_timer + dtime, 0.125);
 152
 153         if (m_wield_change_timer >= 0 && was_under_zero)
 154                 m_wieldnode->setItem(m_wield_item_next, m_gamedef);
 155
 156         if (m_view_bobbing_state != 0)
 157         {
 158                 //f32 offset = dtime * m_view_bobbing_speed * 0.035;
 159                 f32 offset = dtime * m_view_bobbing_speed * 0.030;
 160                 if (m_view_bobbing_state == 2) {
 161                         // Animation is getting turned off
 162                         if (m_view_bobbing_anim < 0.25) {
 163                                 m_view_bobbing_anim -= offset;
 164                         } else if (m_view_bobbing_anim > 0.75) {
 165                                 m_view_bobbing_anim += offset;
 166                         }
 167
 168                         if (m_view_bobbing_anim < 0.5) {
 169                                 m_view_bobbing_anim += offset;
 170                                 if (m_view_bobbing_anim > 0.5)
 171                                         m_view_bobbing_anim = 0.5;
 172                         } else {
 173                                 m_view_bobbing_anim -= offset;
 174                                 if (m_view_bobbing_anim < 0.5)
 175                                         m_view_bobbing_anim = 0.5;
 176                         }
 177
 178                         if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
 179                                         fabs(m_view_bobbing_anim - 0.5) < 0.01) {
 180                                 m_view_bobbing_anim = 0;
 181                                 m_view_bobbing_state = 0;
 182                         }
 183                 }
 184                 else {
 185                         float was = m_view_bobbing_anim;
 186                         m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
 187                         bool step = (was == 0 ||
 188                                         (was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
 189                                         (was > 0.5f && m_view_bobbing_anim <= 0.5f));
 190                         if(step) {
 191                                 MtEvent *e = new SimpleTriggerEvent("ViewBobbingStep");
 192                                 m_gamedef->event()->put(e);
 193                         }
 194                 }
 195         }
 196
 197         if (m_digging_button != -1)
 198         {
 199                 f32 offset = dtime * 3.5;
 200                 float m_digging_anim_was = m_digging_anim;
 201                 m_digging_anim += offset;
 202                 if (m_digging_anim >= 1)
 203                 {
 204                         m_digging_anim = 0;
 205                         m_digging_button = -1;
 206                 }
 207                 float lim = 0.15;
 208                 if(m_digging_anim_was < lim && m_digging_anim >= lim)
 209                 {
 210                         if(m_digging_button == 0)
 211                         {
 212                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchLeft");
 213                                 m_gamedef->event()->put(e);
 214                         } else if(m_digging_button == 1) {
 215                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchRight");
 216                                 m_gamedef->event()->put(e);
 217                         }
 218                 }
 219         }
 220 }
 221
 222 void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
 223                 f32 tool_reload_ratio, ClientEnvironment &c_env)
 224 {
 225         // Get player position
 226         // Smooth the movement when walking up stairs
 227         v3f old_player_position = m_playernode->getPosition();
 228         v3f player_position = player->getPosition();
 229         if (player->isAttached && player->parent)
 230                 player_position = player->parent->getPosition();
 231         //if(player->touching_ground && player_position.Y > old_player_position.Y)
 232         if(player->touching_ground &&
 233                         player_position.Y > old_player_position.Y)
 234         {
 235                 f32 oldy = old_player_position.Y;
 236                 f32 newy = player_position.Y;
 237                 f32 t = exp(-23*frametime);
 238                 player_position.Y = oldy * t + newy * (1-t);
 239         }
 240
 241         // Set player node transformation
 242         m_playernode->setPosition(player_position);
 243         m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
 244         m_playernode->updateAbsolutePosition();
 245
 246         // Get camera tilt timer (hurt animation)
 247         float cameratilt = fabs(fabs(player->hurt_tilt_timer-0.75)-0.75);
 248
 249         // Fall bobbing animation
 250         float fall_bobbing = 0;
 251         if(player->camera_impact >= 1 && m_camera_mode < CAMERA_MODE_THIRD)
 252         {
 253                 if(m_view_bobbing_fall == -1) // Effect took place and has finished
 254                         player->camera_impact = m_view_bobbing_fall = 0;
 255                 else if(m_view_bobbing_fall == 0) // Initialize effect
 256                         m_view_bobbing_fall = 1;
 257
 258                 // Convert 0 -> 1 to 0 -> 1 -> 0
 259                 fall_bobbing = m_view_bobbing_fall < 0.5 ? m_view_bobbing_fall * 2 : -(m_view_bobbing_fall - 0.5) * 2 + 1;
 260                 // Smoothen and invert the above
 261                 fall_bobbing = sin(fall_bobbing * 0.5 * M_PI) * -1;
 262                 // Amplify according to the intensity of the impact
 263                 fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;
 264
 265                 fall_bobbing *= m_cache_fall_bobbing_amount;
 266         }
 267
 268         // Calculate players eye offset for different camera modes
 269         v3f PlayerEyeOffset = player->getEyeOffset();
 270         if (m_camera_mode == CAMERA_MODE_FIRST)
 271                 PlayerEyeOffset += player->eye_offset_first;
 272         else
 273                 PlayerEyeOffset += player->eye_offset_third;
 274
 275         // Set head node transformation
 276         m_headnode->setPosition(PlayerEyeOffset+v3f(0,cameratilt*-player->hurt_tilt_strength+fall_bobbing,0));
 277         m_headnode->setRotation(v3f(player->getPitch(), 0, cameratilt*player->hurt_tilt_strength));
 278         m_headnode->updateAbsolutePosition();
 279
 280         // Compute relative camera position and target
 281         v3f rel_cam_pos = v3f(0,0,0);
 282         v3f rel_cam_target = v3f(0,0,1);
 283         v3f rel_cam_up = v3f(0,1,0);
 284
 285         if (m_view_bobbing_anim != 0 && m_camera_mode < CAMERA_MODE_THIRD)
 286         {
 287                 f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
 288                 f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;
 289
 290                 #if 1
 291                 f32 bobknob = 1.2;
 292                 f32 bobtmp = sin(pow(bobfrac, bobknob) * M_PI);
 293                 //f32 bobtmp2 = cos(pow(bobfrac, bobknob) * M_PI);
 294
 295                 v3f bobvec = v3f(
 296                         0.3 * bobdir * sin(bobfrac * M_PI),
 297                         -0.28 * bobtmp * bobtmp,
 298                         0.);
 299
 300                 //rel_cam_pos += 0.2 * bobvec;
 301                 //rel_cam_target += 0.03 * bobvec;
 302                 //rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * M_PI);
 303                 float f = 1.0;
 304                 f *= m_cache_view_bobbing_amount;
 305                 rel_cam_pos += bobvec * f;
 306                 //rel_cam_target += 0.995 * bobvec * f;
 307                 rel_cam_target += bobvec * f;
 308                 rel_cam_target.Z -= 0.005 * bobvec.Z * f;
 309                 //rel_cam_target.X -= 0.005 * bobvec.X * f;
 310                 //rel_cam_target.Y -= 0.005 * bobvec.Y * f;
 311                 rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * M_PI * f);
 312                 #else
 313                 f32 angle_deg = 1 * bobdir * sin(bobfrac * M_PI);
 314                 f32 angle_rad = angle_deg * M_PI / 180;
 315                 f32 r = 0.05;
 316                 v3f off = v3f(
 317                         r * sin(angle_rad),
 318                         r * (cos(angle_rad) - 1),
 319                         0);
 320                 rel_cam_pos += off;
 321                 //rel_cam_target += off;
 322                 rel_cam_up.rotateXYBy(angle_deg);
 323                 #endif
 324
 325         }
 326
 327         // Compute absolute camera position and target
 328         m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
 329         m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);
 330
 331         v3f abs_cam_up;
 332         m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 333
 334         // Seperate camera position for calculation
 335         v3f my_cp = m_camera_position;
 336
 337         // Reposition the camera for third person view
 338         if (m_camera_mode > CAMERA_MODE_FIRST)
 339         {
 340                 if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 341                         m_camera_direction *= -1;
 342
 343                 my_cp.Y += 2;
 344
 345                 // Calculate new position
 346                 bool abort = false;
 347                 for (int i = BS; i <= BS*2.75; i++)
 348                 {
 349                         my_cp.X = m_camera_position.X + m_camera_direction.X*-i;
 350                         my_cp.Z = m_camera_position.Z + m_camera_direction.Z*-i;
 351                         if (i > 12)
 352                                 my_cp.Y = m_camera_position.Y + (m_camera_direction.Y*-i);
 353
 354                         // Prevent camera positioned inside nodes
 355                         INodeDefManager *nodemgr = m_gamedef->ndef();
 356                         MapNode n = c_env.getClientMap().getNodeNoEx(floatToInt(my_cp, BS));
 357                         const ContentFeatures& features = nodemgr->get(n);
 358                         if(features.walkable)
 359                         {
 360                                 my_cp.X += m_camera_direction.X*-1*-BS/2;
 361                                 my_cp.Z += m_camera_direction.Z*-1*-BS/2;
 362                                 my_cp.Y += m_camera_direction.Y*-1*-BS/2;
 363                                 abort = true;
 364                                 break;
 365                         }
 366                 }
 367
 368                 // If node blocks camera position don't move y to heigh
 369                 if (abort && my_cp.Y > player_position.Y+BS*2)
 370                         my_cp.Y = player_position.Y+BS*2;
 371         }
 372
 373         // Update offset if too far away from the center of the map
 374         m_camera_offset.X += CAMERA_OFFSET_STEP*
 375                         (((s16)(my_cp.X/BS) - m_camera_offset.X)/CAMERA_OFFSET_STEP);
 376         m_camera_offset.Y += CAMERA_OFFSET_STEP*
 377                         (((s16)(my_cp.Y/BS) - m_camera_offset.Y)/CAMERA_OFFSET_STEP);
 378         m_camera_offset.Z += CAMERA_OFFSET_STEP*
 379                         (((s16)(my_cp.Z/BS) - m_camera_offset.Z)/CAMERA_OFFSET_STEP);
 380
 381         // Set camera node transformation
 382         m_cameranode->setPosition(my_cp-intToFloat(m_camera_offset, BS));
 383         m_cameranode->setUpVector(abs_cam_up);
 384         // *100.0 helps in large map coordinates
 385         m_cameranode->setTarget(my_cp-intToFloat(m_camera_offset, BS) + 100 * m_camera_direction);
 386
 387         // update the camera position in front-view mode to render blocks behind player
 388         if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 389                 m_camera_position = my_cp;
 390
 391         // Get FOV
 392         f32 fov_degrees;
 393         if (player->getPlayerControl().zoom) {
 394                 fov_degrees = m_cache_zoom_fov;
 395         } else {
 396                 fov_degrees = m_cache_fov;
 397         }
 398         fov_degrees = MYMAX(fov_degrees, 10.0);
 399         fov_degrees = MYMIN(fov_degrees, 170.0);
 400
 401         // FOV and aspect ratio
 402         m_aspect = (f32) porting::getWindowSize().X / (f32) porting::getWindowSize().Y;
 403         m_fov_y = fov_degrees * M_PI / 180.0;
 404         // Increase vertical FOV on lower aspect ratios (<16:10)
 405         m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
 406         m_fov_x = 2 * atan(m_aspect * tan(0.5 * m_fov_y));
 407         m_cameranode->setAspectRatio(m_aspect);
 408         m_cameranode->setFOV(m_fov_y);
 409
 410         // Position the wielded item
 411         //v3f wield_position = v3f(45, -35, 65);
 412         v3f wield_position = v3f(55, -35, 65);
 413         //v3f wield_rotation = v3f(-100, 120, -100);
 414         v3f wield_rotation = v3f(-100, 120, -100);
 415         wield_position.Y += fabs(m_wield_change_timer)*320 - 40;
 416         if(m_digging_anim < 0.05 || m_digging_anim > 0.5)
 417         {
 418                 f32 frac = 1.0;
 419                 if(m_digging_anim > 0.5)
 420                         frac = 2.0 * (m_digging_anim - 0.5);
 421                 // This value starts from 1 and settles to 0
 422                 f32 ratiothing = pow((1.0f - tool_reload_ratio), 0.5f);
 423                 //f32 ratiothing2 = pow(ratiothing, 0.5f);
 424                 f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
 425                 wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
 426                 //wield_position.Z += frac * 5.0 * ratiothing2;
 427                 wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
 428                 wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
 429                 //wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
 430                 //wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
 431         }
 432         if (m_digging_button != -1)
 433         {
 434                 f32 digfrac = m_digging_anim;
 435                 wield_position.X -= 50 * sin(pow(digfrac, 0.8f) * M_PI);
 436                 wield_position.Y += 24 * sin(digfrac * 1.8 * M_PI);
 437                 wield_position.Z += 25 * 0.5;
 438
 439                 // Euler angles are PURE EVIL, so why not use quaternions?
 440                 core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
 441                 core::quaternion quat_end(v3f(80, 30, 100) * core::DEGTORAD);
 442                 core::quaternion quat_slerp;
 443                 quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * M_PI));
 444                 quat_slerp.toEuler(wield_rotation);
 445                 wield_rotation *= core::RADTODEG;
 446         } else {
 447                 f32 bobfrac = my_modf(m_view_bobbing_anim);
 448                 wield_position.X -= sin(bobfrac*M_PI*2.0) * 3.0;
 449                 wield_position.Y += sin(my_modf(bobfrac*2.0)*M_PI) * 3.0;
 450         }
 451         m_wieldnode->setPosition(wield_position);
 452         m_wieldnode->setRotation(wield_rotation);
 453
 454         m_wieldnode->setColor(player->light_color);
 455
 456         // Set render distance
 457         updateViewingRange();
 458
 459         // If the player is walking, swimming, or climbing,
 460         // view bobbing is enabled and free_move is off,
 461         // start (or continue) the view bobbing animation.
 462         v3f speed = player->getSpeed();
 463         const bool movement_XZ = hypot(speed.X, speed.Z) > BS;
 464         const bool movement_Y = fabs(speed.Y) > BS;
 465
 466         const bool walking = movement_XZ && player->touching_ground;
 467         const bool swimming = (movement_XZ || player->swimming_vertical) && player->in_liquid;
 468         const bool climbing = movement_Y && player->is_climbing;
 469         if ((walking || swimming || climbing) &&
 470                         m_cache_view_bobbing &&
 471                         (!g_settings->getBool("free_move") || !m_gamedef->checkLocalPrivilege("fly")))
 472         {
 473                 // Start animation
 474                 m_view_bobbing_state = 1;
 475                 m_view_bobbing_speed = MYMIN(speed.getLength(), 40);
 476         }
 477         else if (m_view_bobbing_state == 1)
 478         {
 479                 // Stop animation
 480                 m_view_bobbing_state = 2;
 481                 m_view_bobbing_speed = 60;
 482         }
 483 }
 484
 485 void Camera::updateViewingRange()
 486 {
 487         if (m_draw_control.range_all) {
 488                 m_cameranode->setFarValue(100000.0);
 489                 return;
 490         }
 491
 492         f32 viewing_range = g_settings->getFloat("viewing_range");
 493         m_draw_control.wanted_range = viewing_range;
 494         m_cameranode->setFarValue((viewing_range < 2000) ? 2000 * BS : viewing_range * BS);
 495 }
 496
 497 void Camera::setDigging(s32 button)
 498 {
 499         if (m_digging_button == -1)
 500                 m_digging_button = button;
 501 }
 502
 503 void Camera::wield(const ItemStack &item)
 504 {
 505         if (item.name != m_wield_item_next.name) {
 506                 m_wield_item_next = item;
 507                 if (m_wield_change_timer > 0)
 508                         m_wield_change_timer = -m_wield_change_timer;
 509                 else if (m_wield_change_timer == 0)
 510                         m_wield_change_timer = -0.001;
 511         }
 512 }
 513
 514 void Camera::drawWieldedTool(irr::core::matrix4* translation)
 515 {
 516         // Clear Z buffer so that the wielded tool stay in front of world geometry
 517         m_wieldmgr->getVideoDriver()->clearZBuffer();
 518
 519         // Draw the wielded node (in a separate scene manager)
 520         scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
 521         cam->setAspectRatio(m_cameranode->getAspectRatio());
 522         cam->setFOV(72.0*M_PI/180.0);
 523         cam->setNearValue(10);
 524         cam->setFarValue(1000);
 525         if (translation != NULL)
 526         {
 527                 irr::core::matrix4 startMatrix = cam->getAbsoluteTransformation();
 528                 irr::core::vector3df focusPoint = (cam->getTarget()
 529                                 - cam->getAbsolutePosition()).setLength(1)
 530                                 + cam->getAbsolutePosition();
 531
 532                 irr::core::vector3df camera_pos =
 533                                 (startMatrix * *translation).getTranslation();
 534                 cam->setPosition(camera_pos);
 535                 cam->setTarget(focusPoint);
 536         }
 537         m_wieldmgr->drawAll();
 538 }
 539
 540 void Camera::drawNametags()
 541 {
 542         core::matrix4 trans = m_cameranode->getProjectionMatrix();
 543         trans *= m_cameranode->getViewMatrix();
 544
 545         for (std::list<Nametag *>::const_iterator
 546                         i = m_nametags.begin();
 547                         i != m_nametags.end(); ++i) {
 548                 Nametag *nametag = *i;
 549                 if (nametag->nametag_color.getAlpha() == 0) {
 550                         // Enforce hiding nametag,
 551                         // because if freetype is enabled, a grey
 552                         // shadow can remain.
 553                         continue;
 554                 }
 555                 v3f pos = nametag->parent_node->getPosition() + v3f(0.0, 1.1 * BS, 0.0);
 556                 f32 transformed_pos[4] = { pos.X, pos.Y, pos.Z, 1.0f };
 557                 trans.multiplyWith1x4Matrix(transformed_pos);
 558                 if (transformed_pos[3] > 0) {
 559                         core::dimension2d<u32> textsize =
 560                                 g_fontengine->getFont()->getDimension(
 561                                 utf8_to_wide(nametag->nametag_text).c_str());
 562                         f32 zDiv = transformed_pos[3] == 0.0f ? 1.0f :
 563                                 core::reciprocal(transformed_pos[3]);
 564                         v2u32 screensize = m_driver->getScreenSize();
 565                         v2s32 screen_pos;
 566                         screen_pos.X = screensize.X *
 567                                 (0.5 * transformed_pos[0] * zDiv + 0.5) - textsize.Width / 2;
 568                         screen_pos.Y = screensize.Y *
 569                                 (0.5 - transformed_pos[1] * zDiv * 0.5) - textsize.Height / 2;
 570                         core::rect<s32> size(0, 0, textsize.Width, textsize.Height);
 571                         g_fontengine->getFont()->draw(utf8_to_wide(nametag->nametag_text).c_str(),
 572                                         size + screen_pos, nametag->nametag_color);
 573                 }
 574         }
 575 }
 576
 577 Nametag *Camera::addNametag(scene::ISceneNode *parent_node,
 578                 std::string nametag_text, video::SColor nametag_color)
 579 {
 580         Nametag *nametag = new Nametag(parent_node, nametag_text, nametag_color);
 581         m_nametags.push_back(nametag);
 582         return nametag;
 583 }
 584
 585 void Camera::removeNametag(Nametag *nametag)
 586 {
 587         m_nametags.remove(nametag);
 588         delete nametag;
 589 }