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