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
  37 #define CAMERA_OFFSET_STEP 200
  38
  39 #include "nodedef.h"
  40
  41 Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
  42                 Client *client):
  43         m_playernode(NULL),
  44         m_headnode(NULL),
  45         m_cameranode(NULL),
  46
  47         m_wieldmgr(NULL),
  48         m_wieldnode(NULL),
  49
  50         m_draw_control(draw_control),
  51         m_client(client),
  52
  53         m_camera_position(0,0,0),
  54         m_camera_direction(0,0,0),
  55         m_camera_offset(0,0,0),
  56
  57         m_aspect(1.0),
  58         m_fov_x(1.0),
  59         m_fov_y(1.0),
  60
  61         m_view_bobbing_anim(0),
  62         m_view_bobbing_state(0),
  63         m_view_bobbing_speed(0),
  64         m_view_bobbing_fall(0),
  65
  66         m_digging_anim(0),
  67         m_digging_button(-1),
  68
  69         m_wield_change_timer(0.125),
  70         m_wield_item_next(),
  71
  72         m_camera_mode(CAMERA_MODE_FIRST)
  73 {
  74         //dstream<<FUNCTION_NAME<<std::endl;
  75
  76         m_driver = smgr->getVideoDriver();
  77         // note: making the camera node a child of the player node
  78         // would lead to unexpected behaviour, so we don't do that.
  79         m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
  80         m_headnode = smgr->addEmptySceneNode(m_playernode);
  81         m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
  82         m_cameranode->bindTargetAndRotation(true);
  83
  84         // This needs to be in its own scene manager. It is drawn after
  85         // all other 3D scene nodes and before the GUI.
  86         m_wieldmgr = smgr->createNewSceneManager();
  87         m_wieldmgr->addCameraSceneNode();
  88         m_wieldnode = new WieldMeshSceneNode(m_wieldmgr->getRootSceneNode(), m_wieldmgr, -1, false);
  89         m_wieldnode->setItem(ItemStack(), m_client);
  90         m_wieldnode->drop(); // m_wieldmgr grabbed it
  91
  92         /* TODO: Add a callback function so these can be updated when a setting
  93          *       changes.  At this point in time it doesn't matter (e.g. /set
  94          *       is documented to change server settings only)
  95          *
  96          * TODO: Local caching of settings is not optimal and should at some stage
  97          *       be updated to use a global settings object for getting thse values
  98          *       (as opposed to the this local caching). This can be addressed in
  99          *       a later release.
 100          */
 101         m_cache_fall_bobbing_amount = g_settings->getFloat("fall_bobbing_amount");
 102         m_cache_view_bobbing_amount = g_settings->getFloat("view_bobbing_amount");
 103         m_cache_fov                 = g_settings->getFloat("fov");
 104         m_cache_zoom_fov            = g_settings->getFloat("zoom_fov");
 105         m_cache_view_bobbing        = g_settings->getBool("view_bobbing");
 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         return error_message.empty();
 130 }
 131
 132 // Returns the fractional part of x
 133 inline f32 my_modf(f32 x)
 134 {
 135         double dummy;
 136         return modf(x, &dummy);
 137 }
 138
 139 void Camera::step(f32 dtime)
 140 {
 141         if(m_view_bobbing_fall > 0)
 142         {
 143                 m_view_bobbing_fall -= 3 * dtime;
 144                 if(m_view_bobbing_fall <= 0)
 145                         m_view_bobbing_fall = -1; // Mark the effect as finished
 146         }
 147
 148         bool was_under_zero = m_wield_change_timer < 0;
 149         m_wield_change_timer = MYMIN(m_wield_change_timer + dtime, 0.125);
 150
 151         if (m_wield_change_timer >= 0 && was_under_zero)
 152                 m_wieldnode->setItem(m_wield_item_next, m_client);
 153
 154         if (m_view_bobbing_state != 0)
 155         {
 156                 //f32 offset = dtime * m_view_bobbing_speed * 0.035;
 157                 f32 offset = dtime * m_view_bobbing_speed * 0.030;
 158                 if (m_view_bobbing_state == 2) {
 159                         // Animation is getting turned off
 160                         if (m_view_bobbing_anim < 0.25) {
 161                                 m_view_bobbing_anim -= offset;
 162                         } else if (m_view_bobbing_anim > 0.75) {
 163                                 m_view_bobbing_anim += offset;
 164                         }
 165
 166                         if (m_view_bobbing_anim < 0.5) {
 167                                 m_view_bobbing_anim += offset;
 168                                 if (m_view_bobbing_anim > 0.5)
 169                                         m_view_bobbing_anim = 0.5;
 170                         } else {
 171                                 m_view_bobbing_anim -= offset;
 172                                 if (m_view_bobbing_anim < 0.5)
 173                                         m_view_bobbing_anim = 0.5;
 174                         }
 175
 176                         if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
 177                                         fabs(m_view_bobbing_anim - 0.5) < 0.01) {
 178                                 m_view_bobbing_anim = 0;
 179                                 m_view_bobbing_state = 0;
 180                         }
 181                 }
 182                 else {
 183                         float was = m_view_bobbing_anim;
 184                         m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
 185                         bool step = (was == 0 ||
 186                                         (was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
 187                                         (was > 0.5f && m_view_bobbing_anim <= 0.5f));
 188                         if(step) {
 189                                 MtEvent *e = new SimpleTriggerEvent("ViewBobbingStep");
 190                                 m_client->event()->put(e);
 191                         }
 192                 }
 193         }
 194
 195         if (m_digging_button != -1)
 196         {
 197                 f32 offset = dtime * 3.5;
 198                 float m_digging_anim_was = m_digging_anim;
 199                 m_digging_anim += offset;
 200                 if (m_digging_anim >= 1)
 201                 {
 202                         m_digging_anim = 0;
 203                         m_digging_button = -1;
 204                 }
 205                 float lim = 0.15;
 206                 if(m_digging_anim_was < lim && m_digging_anim >= lim)
 207                 {
 208                         if(m_digging_button == 0)
 209                         {
 210                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchLeft");
 211                                 m_client->event()->put(e);
 212                         } else if(m_digging_button == 1) {
 213                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchRight");
 214                                 m_client->event()->put(e);
 215                         }
 216                 }
 217         }
 218 }
 219
 220 void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
 221                 f32 tool_reload_ratio, ClientEnvironment &c_env)
 222 {
 223         // Get player position
 224         // Smooth the movement when walking up stairs
 225         v3f old_player_position = m_playernode->getPosition();
 226         v3f player_position = player->getPosition();
 227         if (player->isAttached && player->parent)
 228                 player_position = player->parent->getPosition();
 229         //if(player->touching_ground && player_position.Y > old_player_position.Y)
 230         if(player->touching_ground &&
 231                         player_position.Y > old_player_position.Y)
 232         {
 233                 f32 oldy = old_player_position.Y;
 234                 f32 newy = player_position.Y;
 235                 f32 t = exp(-23*frametime);
 236                 player_position.Y = oldy * t + newy * (1-t);
 237         }
 238
 239         // Set player node transformation
 240         m_playernode->setPosition(player_position);
 241         m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
 242         m_playernode->updateAbsolutePosition();
 243
 244         // Get camera tilt timer (hurt animation)
 245         float cameratilt = fabs(fabs(player->hurt_tilt_timer-0.75)-0.75);
 246
 247         // Fall bobbing animation
 248         float fall_bobbing = 0;
 249         if(player->camera_impact >= 1 && m_camera_mode < CAMERA_MODE_THIRD)
 250         {
 251                 if(m_view_bobbing_fall == -1) // Effect took place and has finished
 252                         player->camera_impact = m_view_bobbing_fall = 0;
 253                 else if(m_view_bobbing_fall == 0) // Initialize effect
 254                         m_view_bobbing_fall = 1;
 255
 256                 // Convert 0 -> 1 to 0 -> 1 -> 0
 257                 fall_bobbing = m_view_bobbing_fall < 0.5 ? m_view_bobbing_fall * 2 : -(m_view_bobbing_fall - 0.5) * 2 + 1;
 258                 // Smoothen and invert the above
 259                 fall_bobbing = sin(fall_bobbing * 0.5 * M_PI) * -1;
 260                 // Amplify according to the intensity of the impact
 261                 fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;
 262
 263                 fall_bobbing *= m_cache_fall_bobbing_amount;
 264         }
 265
 266         // Calculate players eye offset for different camera modes
 267         v3f PlayerEyeOffset = player->getEyeOffset();
 268         if (m_camera_mode == CAMERA_MODE_FIRST)
 269                 PlayerEyeOffset += player->eye_offset_first;
 270         else
 271                 PlayerEyeOffset += player->eye_offset_third;
 272
 273         // Set head node transformation
 274         m_headnode->setPosition(PlayerEyeOffset+v3f(0,cameratilt*-player->hurt_tilt_strength+fall_bobbing,0));
 275         m_headnode->setRotation(v3f(player->getPitch(), 0, cameratilt*player->hurt_tilt_strength));
 276         m_headnode->updateAbsolutePosition();
 277
 278         // Compute relative camera position and target
 279         v3f rel_cam_pos = v3f(0,0,0);
 280         v3f rel_cam_target = v3f(0,0,1);
 281         v3f rel_cam_up = v3f(0,1,0);
 282
 283         if (m_view_bobbing_anim != 0 && m_camera_mode < CAMERA_MODE_THIRD)
 284         {
 285                 f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
 286                 f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;
 287
 288                 #if 1
 289                 f32 bobknob = 1.2;
 290                 f32 bobtmp = sin(pow(bobfrac, bobknob) * M_PI);
 291                 //f32 bobtmp2 = cos(pow(bobfrac, bobknob) * M_PI);
 292
 293                 v3f bobvec = v3f(
 294                         0.3 * bobdir * sin(bobfrac * M_PI),
 295                         -0.28 * bobtmp * bobtmp,
 296                         0.);
 297
 298                 //rel_cam_pos += 0.2 * bobvec;
 299                 //rel_cam_target += 0.03 * bobvec;
 300                 //rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * M_PI);
 301                 float f = 1.0;
 302                 f *= m_cache_view_bobbing_amount;
 303                 rel_cam_pos += bobvec * f;
 304                 //rel_cam_target += 0.995 * bobvec * f;
 305                 rel_cam_target += bobvec * f;
 306                 rel_cam_target.Z -= 0.005 * bobvec.Z * f;
 307                 //rel_cam_target.X -= 0.005 * bobvec.X * f;
 308                 //rel_cam_target.Y -= 0.005 * bobvec.Y * f;
 309                 rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * M_PI * f);
 310                 #else
 311                 f32 angle_deg = 1 * bobdir * sin(bobfrac * M_PI);
 312                 f32 angle_rad = angle_deg * M_PI / 180;
 313                 f32 r = 0.05;
 314                 v3f off = v3f(
 315                         r * sin(angle_rad),
 316                         r * (cos(angle_rad) - 1),
 317                         0);
 318                 rel_cam_pos += off;
 319                 //rel_cam_target += off;
 320                 rel_cam_up.rotateXYBy(angle_deg);
 321                 #endif
 322
 323         }
 324
 325         // Compute absolute camera position and target
 326         m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
 327         m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);
 328
 329         v3f abs_cam_up;
 330         m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 331
 332         // Seperate camera position for calculation
 333         v3f my_cp = m_camera_position;
 334
 335         // Reposition the camera for third person view
 336         if (m_camera_mode > CAMERA_MODE_FIRST)
 337         {
 338                 if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 339                         m_camera_direction *= -1;
 340
 341                 my_cp.Y += 2;
 342
 343                 // Calculate new position
 344                 bool abort = false;
 345                 for (int i = BS; i <= BS*2.75; i++)
 346                 {
 347                         my_cp.X = m_camera_position.X + m_camera_direction.X*-i;
 348                         my_cp.Z = m_camera_position.Z + m_camera_direction.Z*-i;
 349                         if (i > 12)
 350                                 my_cp.Y = m_camera_position.Y + (m_camera_direction.Y*-i);
 351
 352                         // Prevent camera positioned inside nodes
 353                         INodeDefManager *nodemgr = m_client->ndef();
 354                         MapNode n = c_env.getClientMap().getNodeNoEx(floatToInt(my_cp, BS));
 355                         const ContentFeatures& features = nodemgr->get(n);
 356                         if(features.walkable)
 357                         {
 358                                 my_cp.X += m_camera_direction.X*-1*-BS/2;
 359                                 my_cp.Z += m_camera_direction.Z*-1*-BS/2;
 360                                 my_cp.Y += m_camera_direction.Y*-1*-BS/2;
 361                                 abort = true;
 362                                 break;
 363                         }
 364                 }
 365
 366                 // If node blocks camera position don't move y to heigh
 367                 if (abort && my_cp.Y > player_position.Y+BS*2)
 368                         my_cp.Y = player_position.Y+BS*2;
 369         }
 370
 371         // Update offset if too far away from the center of the map
 372         m_camera_offset.X += CAMERA_OFFSET_STEP*
 373                         (((s16)(my_cp.X/BS) - m_camera_offset.X)/CAMERA_OFFSET_STEP);
 374         m_camera_offset.Y += CAMERA_OFFSET_STEP*
 375                         (((s16)(my_cp.Y/BS) - m_camera_offset.Y)/CAMERA_OFFSET_STEP);
 376         m_camera_offset.Z += CAMERA_OFFSET_STEP*
 377                         (((s16)(my_cp.Z/BS) - m_camera_offset.Z)/CAMERA_OFFSET_STEP);
 378
 379         // Set camera node transformation
 380         m_cameranode->setPosition(my_cp-intToFloat(m_camera_offset, BS));
 381         m_cameranode->setUpVector(abs_cam_up);
 382         // *100.0 helps in large map coordinates
 383         m_cameranode->setTarget(my_cp-intToFloat(m_camera_offset, BS) + 100 * m_camera_direction);
 384
 385         // update the camera position in front-view mode to render blocks behind player
 386         if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 387                 m_camera_position = my_cp;
 388
 389         // Get FOV
 390         f32 fov_degrees;
 391         if (player->getPlayerControl().zoom && m_client->checkLocalPrivilege("zoom")) {
 392                 fov_degrees = m_cache_zoom_fov;
 393         } else {
 394                 fov_degrees = m_cache_fov;
 395         }
 396         fov_degrees = MYMAX(fov_degrees, 10.0);
 397         fov_degrees = MYMIN(fov_degrees, 170.0);
 398
 399         // FOV and aspect ratio
 400         m_aspect = (f32) porting::getWindowSize().X / (f32) porting::getWindowSize().Y;
 401         m_fov_y = fov_degrees * M_PI / 180.0;
 402         // Increase vertical FOV on lower aspect ratios (<16:10)
 403         m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
 404         m_fov_x = 2 * atan(m_aspect * tan(0.5 * m_fov_y));
 405         m_cameranode->setAspectRatio(m_aspect);
 406         m_cameranode->setFOV(m_fov_y);
 407
 408         // Position the wielded item
 409         //v3f wield_position = v3f(45, -35, 65);
 410         v3f wield_position = v3f(55, -35, 65);
 411         //v3f wield_rotation = v3f(-100, 120, -100);
 412         v3f wield_rotation = v3f(-100, 120, -100);
 413         wield_position.Y += fabs(m_wield_change_timer)*320 - 40;
 414         if(m_digging_anim < 0.05 || m_digging_anim > 0.5)
 415         {
 416                 f32 frac = 1.0;
 417                 if(m_digging_anim > 0.5)
 418                         frac = 2.0 * (m_digging_anim - 0.5);
 419                 // This value starts from 1 and settles to 0
 420                 f32 ratiothing = pow((1.0f - tool_reload_ratio), 0.5f);
 421                 //f32 ratiothing2 = pow(ratiothing, 0.5f);
 422                 f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
 423                 wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
 424                 //wield_position.Z += frac * 5.0 * ratiothing2;
 425                 wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
 426                 wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
 427                 //wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
 428                 //wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
 429         }
 430         if (m_digging_button != -1)
 431         {
 432                 f32 digfrac = m_digging_anim;
 433                 wield_position.X -= 50 * sin(pow(digfrac, 0.8f) * M_PI);
 434                 wield_position.Y += 24 * sin(digfrac * 1.8 * M_PI);
 435                 wield_position.Z += 25 * 0.5;
 436
 437                 // Euler angles are PURE EVIL, so why not use quaternions?
 438                 core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
 439                 core::quaternion quat_end(v3f(80, 30, 100) * core::DEGTORAD);
 440                 core::quaternion quat_slerp;
 441                 quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * M_PI));
 442                 quat_slerp.toEuler(wield_rotation);
 443                 wield_rotation *= core::RADTODEG;
 444         } else {
 445                 f32 bobfrac = my_modf(m_view_bobbing_anim);
 446                 wield_position.X -= sin(bobfrac*M_PI*2.0) * 3.0;
 447                 wield_position.Y += sin(my_modf(bobfrac*2.0)*M_PI) * 3.0;
 448         }
 449         m_wieldnode->setPosition(wield_position);
 450         m_wieldnode->setRotation(wield_rotation);
 451
 452         m_wieldnode->setColor(player->light_color);
 453
 454         // Set render distance
 455         updateViewingRange();
 456
 457         // If the player is walking, swimming, or climbing,
 458         // view bobbing is enabled and free_move is off,
 459         // start (or continue) the view bobbing animation.
 460         v3f speed = player->getSpeed();
 461         const bool movement_XZ = hypot(speed.X, speed.Z) > BS;
 462         const bool movement_Y = fabs(speed.Y) > BS;
 463
 464         const bool walking = movement_XZ && player->touching_ground;
 465         const bool swimming = (movement_XZ || player->swimming_vertical) && player->in_liquid;
 466         const bool climbing = movement_Y && player->is_climbing;
 467         if ((walking || swimming || climbing) &&
 468                         m_cache_view_bobbing &&
 469                         (!g_settings->getBool("free_move") || !m_client->checkLocalPrivilege("fly")))
 470         {
 471                 // Start animation
 472                 m_view_bobbing_state = 1;
 473                 m_view_bobbing_speed = MYMIN(speed.getLength(), 70);
 474         }
 475         else if (m_view_bobbing_state == 1)
 476         {
 477                 // Stop animation
 478                 m_view_bobbing_state = 2;
 479                 m_view_bobbing_speed = 60;
 480         }
 481 }
 482
 483 void Camera::updateViewingRange()
 484 {
 485         f32 viewing_range = g_settings->getFloat("viewing_range");
 486         m_draw_control.wanted_range = viewing_range;
 487         if (m_draw_control.range_all) {
 488                 m_cameranode->setFarValue(100000.0);
 489                 return;
 490         }
 491         m_cameranode->setFarValue((viewing_range < 2000) ? 2000 * BS : viewing_range * BS);
 492 }
 493
 494 void Camera::setDigging(s32 button)
 495 {
 496         if (m_digging_button == -1)
 497                 m_digging_button = button;
 498 }
 499
 500 void Camera::wield(const ItemStack &item)
 501 {
 502         if (item.name != m_wield_item_next.name) {
 503                 m_wield_item_next = item;
 504                 if (m_wield_change_timer > 0)
 505                         m_wield_change_timer = -m_wield_change_timer;
 506                 else if (m_wield_change_timer == 0)
 507                         m_wield_change_timer = -0.001;
 508         }
 509 }
 510
 511 void Camera::drawWieldedTool(irr::core::matrix4* translation)
 512 {
 513         // Clear Z buffer so that the wielded tool stay in front of world geometry
 514         m_wieldmgr->getVideoDriver()->clearZBuffer();
 515
 516         // Draw the wielded node (in a separate scene manager)
 517         scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
 518         cam->setAspectRatio(m_cameranode->getAspectRatio());
 519         cam->setFOV(72.0*M_PI/180.0);
 520         cam->setNearValue(10);
 521         cam->setFarValue(1000);
 522         if (translation != NULL)
 523         {
 524                 irr::core::matrix4 startMatrix = cam->getAbsoluteTransformation();
 525                 irr::core::vector3df focusPoint = (cam->getTarget()
 526                                 - cam->getAbsolutePosition()).setLength(1)
 527                                 + cam->getAbsolutePosition();
 528
 529                 irr::core::vector3df camera_pos =
 530                                 (startMatrix * *translation).getTranslation();
 531                 cam->setPosition(camera_pos);
 532                 cam->setTarget(focusPoint);
 533         }
 534         m_wieldmgr->drawAll();
 535 }
 536
 537 void Camera::drawNametags()
 538 {
 539         core::matrix4 trans = m_cameranode->getProjectionMatrix();
 540         trans *= m_cameranode->getViewMatrix();
 541
 542         for (std::list<Nametag *>::const_iterator
 543                         i = m_nametags.begin();
 544                         i != m_nametags.end(); ++i) {
 545                 Nametag *nametag = *i;
 546                 if (nametag->nametag_color.getAlpha() == 0) {
 547                         // Enforce hiding nametag,
 548                         // because if freetype is enabled, a grey
 549                         // shadow can remain.
 550                         continue;
 551                 }
 552                 v3f pos = nametag->parent_node->getAbsolutePosition() + v3f(0.0, 1.1 * BS, 0.0);
 553                 f32 transformed_pos[4] = { pos.X, pos.Y, pos.Z, 1.0f };
 554                 trans.multiplyWith1x4Matrix(transformed_pos);
 555                 if (transformed_pos[3] > 0) {
 556                         core::dimension2d<u32> textsize =
 557                                 g_fontengine->getFont()->getDimension(
 558                                 utf8_to_wide(nametag->nametag_text).c_str());
 559                         f32 zDiv = transformed_pos[3] == 0.0f ? 1.0f :
 560                                 core::reciprocal(transformed_pos[3]);
 561                         v2u32 screensize = m_driver->getScreenSize();
 562                         v2s32 screen_pos;
 563                         screen_pos.X = screensize.X *
 564                                 (0.5 * transformed_pos[0] * zDiv + 0.5) - textsize.Width / 2;
 565                         screen_pos.Y = screensize.Y *
 566                                 (0.5 - transformed_pos[1] * zDiv * 0.5) - textsize.Height / 2;
 567                         core::rect<s32> size(0, 0, textsize.Width, textsize.Height);
 568                         g_fontengine->getFont()->draw(utf8_to_wide(nametag->nametag_text).c_str(),
 569                                         size + screen_pos, nametag->nametag_color);
 570                 }
 571         }
 572 }
 573
 574 Nametag *Camera::addNametag(scene::ISceneNode *parent_node,
 575                 std::string nametag_text, video::SColor nametag_color)
 576 {
 577         Nametag *nametag = new Nametag(parent_node, nametag_text, nametag_color);
 578         m_nametags.push_back(nametag);
 579         return nametag;
 580 }
 581
 582 void Camera::removeNametag(Nametag *nametag)
 583 {
 584         m_nametags.remove(nametag);
 585         delete nametag;
 586 }