src/minimap.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2015 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 "minimap.h"
  21 #include "threading/mutex_auto_lock.h"
  22 #include "threading/semaphore.h"
  23 #include "clientmap.h"
  24 #include "settings.h"
  25 #include "nodedef.h"
  26 #include "porting.h"
  27 #include "util/numeric.h"
  28 #include "util/string.h"
  29 #include "mapblock.h"
  30 #include <math.h>
  31
  32
  33 ////
  34 //// MinimapUpdateThread
  35 ////
  36
  37 MinimapUpdateThread::~MinimapUpdateThread()
  38 {
  39         for (std::map<v3s16, MinimapMapblock *>::iterator
  40                         it = m_blocks_cache.begin();
  41                         it != m_blocks_cache.end(); ++it) {
  42                 delete it->second;
  43         }
  44
  45         for (std::deque<QueuedMinimapUpdate>::iterator
  46                         it = m_update_queue.begin();
  47                         it != m_update_queue.end(); ++it) {
  48                 QueuedMinimapUpdate &q = *it;
  49                 delete q.data;
  50         }
  51 }
  52
  53 bool MinimapUpdateThread::pushBlockUpdate(v3s16 pos, MinimapMapblock *data)
  54 {
  55         MutexAutoLock lock(m_queue_mutex);
  56
  57         // Find if block is already in queue.
  58         // If it is, update the data and quit.
  59         for (std::deque<QueuedMinimapUpdate>::iterator
  60                         it = m_update_queue.begin();
  61                         it != m_update_queue.end(); ++it) {
  62                 QueuedMinimapUpdate &q = *it;
  63                 if (q.pos == pos) {
  64                         delete q.data;
  65                         q.data = data;
  66                         return false;
  67                 }
  68         }
  69
  70         // Add the block
  71         QueuedMinimapUpdate q;
  72         q.pos  = pos;
  73         q.data = data;
  74         m_update_queue.push_back(q);
  75
  76         return true;
  77 }
  78
  79 bool MinimapUpdateThread::popBlockUpdate(QueuedMinimapUpdate *update)
  80 {
  81         MutexAutoLock lock(m_queue_mutex);
  82
  83         if (m_update_queue.empty())
  84                 return false;
  85
  86         *update = m_update_queue.front();
  87         m_update_queue.pop_front();
  88
  89         return true;
  90 }
  91
  92 void MinimapUpdateThread::enqueueBlock(v3s16 pos, MinimapMapblock *data)
  93 {
  94         pushBlockUpdate(pos, data);
  95         deferUpdate();
  96 }
  97
  98
  99 void MinimapUpdateThread::doUpdate()
 100 {
 101         QueuedMinimapUpdate update;
 102
 103         while (popBlockUpdate(&update)) {
 104                 if (update.data) {
 105                         // Swap two values in the map using single lookup
 106                         std::pair<std::map<v3s16, MinimapMapblock*>::iterator, bool>
 107                             result = m_blocks_cache.insert(std::make_pair(update.pos, update.data));
 108                         if (result.second == false) {
 109                                 delete result.first->second;
 110                                 result.first->second = update.data;
 111                         }
 112                 } else {
 113                         std::map<v3s16, MinimapMapblock *>::iterator it;
 114                         it = m_blocks_cache.find(update.pos);
 115                         if (it != m_blocks_cache.end()) {
 116                                 delete it->second;
 117                                 m_blocks_cache.erase(it);
 118                         }
 119                 }
 120         }
 121
 122         if (data->map_invalidated && data->mode != MINIMAP_MODE_OFF) {
 123                 getMap(data->pos, data->map_size, data->scan_height, data->is_radar);
 124                 data->map_invalidated = false;
 125         }
 126 }
 127
 128 MinimapPixel *MinimapUpdateThread::getMinimapPixel(v3s16 pos,
 129         s16 scan_height, s16 *pixel_height)
 130 {
 131         s16 height = scan_height - MAP_BLOCKSIZE;
 132         v3s16 blockpos_max, blockpos_min, relpos;
 133
 134         getNodeBlockPosWithOffset(
 135                 v3s16(pos.X, pos.Y - scan_height / 2, pos.Z),
 136                 blockpos_min, relpos);
 137         getNodeBlockPosWithOffset(
 138                 v3s16(pos.X, pos.Y + scan_height / 2, pos.Z),
 139                 blockpos_max, relpos);
 140
 141         for (s16 i = blockpos_max.Y; i > blockpos_min.Y - 1; i--) {
 142                 std::map<v3s16, MinimapMapblock *>::iterator it =
 143                         m_blocks_cache.find(v3s16(blockpos_max.X, i, blockpos_max.Z));
 144                 if (it != m_blocks_cache.end()) {
 145                         MinimapMapblock *mmblock = it->second;
 146                         MinimapPixel *pixel = &mmblock->data[relpos.Z * MAP_BLOCKSIZE + relpos.X];
 147                         if (pixel->n.param0 != CONTENT_AIR) {
 148                                 *pixel_height = height + pixel->height;
 149                                 return pixel;
 150                         }
 151                 }
 152
 153                 height -= MAP_BLOCKSIZE;
 154         }
 155
 156         return NULL;
 157 }
 158
 159 s16 MinimapUpdateThread::getAirCount(v3s16 pos, s16 height)
 160 {
 161         s16 air_count = 0;
 162         v3s16 blockpos_max, blockpos_min, relpos;
 163
 164         getNodeBlockPosWithOffset(
 165                 v3s16(pos.X, pos.Y - height / 2, pos.Z),
 166                 blockpos_min, relpos);
 167         getNodeBlockPosWithOffset(
 168                 v3s16(pos.X, pos.Y + height / 2, pos.Z),
 169                 blockpos_max, relpos);
 170
 171         for (s16 i = blockpos_max.Y; i > blockpos_min.Y - 1; i--) {
 172                 std::map<v3s16, MinimapMapblock *>::iterator it =
 173                         m_blocks_cache.find(v3s16(blockpos_max.X, i, blockpos_max.Z));
 174                 if (it != m_blocks_cache.end()) {
 175                         MinimapMapblock *mmblock = it->second;
 176                         MinimapPixel *pixel = &mmblock->data[relpos.Z * MAP_BLOCKSIZE + relpos.X];
 177                         air_count += pixel->air_count;
 178                 }
 179         }
 180
 181         return air_count;
 182 }
 183
 184 void MinimapUpdateThread::getMap(v3s16 pos, s16 size, s16 height, bool is_radar)
 185 {
 186         v3s16 p = v3s16(pos.X - size / 2, pos.Y, pos.Z - size / 2);
 187
 188         for (s16 x = 0; x < size; x++)
 189         for (s16 z = 0; z < size; z++) {
 190                 MapNode n(CONTENT_AIR);
 191                 MinimapPixel *mmpixel = &data->minimap_scan[x + z * size];
 192
 193                 if (!is_radar) {
 194                         s16 pixel_height = 0;
 195                         MinimapPixel *cached_pixel =
 196                                 getMinimapPixel(v3s16(p.X + x, p.Y, p.Z + z), height, &pixel_height);
 197                         if (cached_pixel) {
 198                                 n = cached_pixel->n;
 199                                 mmpixel->height = pixel_height;
 200                         }
 201                 } else {
 202                         mmpixel->air_count = getAirCount(v3s16(p.X + x, p.Y, p.Z + z), height);
 203                 }
 204
 205                 mmpixel->n = n;
 206         }
 207 }
 208
 209 ////
 210 //// Mapper
 211 ////
 212
 213 Mapper::Mapper(IrrlichtDevice *device, Client *client)
 214 {
 215         this->client    = client;
 216         this->driver    = device->getVideoDriver();
 217         this->m_tsrc    = client->getTextureSource();
 218         this->m_shdrsrc = client->getShaderSource();
 219         this->m_ndef    = client->getNodeDefManager();
 220
 221         m_angle = 0.f;
 222
 223         // Initialize static settings
 224         m_enable_shaders = g_settings->getBool("enable_shaders");
 225         m_surface_mode_scan_height =
 226                 g_settings->getBool("minimap_double_scan_height") ? 256 : 128;
 227
 228         // Initialize minimap data
 229         data = new MinimapData;
 230         data->mode              = MINIMAP_MODE_OFF;
 231         data->is_radar          = false;
 232         data->map_invalidated   = true;
 233         data->heightmap_image   = NULL;
 234         data->minimap_image     = NULL;
 235         data->texture           = NULL;
 236         data->heightmap_texture = NULL;
 237         data->minimap_shape_round = g_settings->getBool("minimap_shape_round");
 238
 239         // Get round minimap textures
 240         data->minimap_mask_round = driver->createImage(
 241                 m_tsrc->getTexture("minimap_mask_round.png"),
 242                 core::position2d<s32>(0, 0),
 243                 core::dimension2d<u32>(MINIMAP_MAX_SX, MINIMAP_MAX_SY));
 244         data->minimap_overlay_round = m_tsrc->getTexture("minimap_overlay_round.png");
 245
 246         // Get square minimap textures
 247         data->minimap_mask_square = driver->createImage(
 248                 m_tsrc->getTexture("minimap_mask_square.png"),
 249                 core::position2d<s32>(0, 0),
 250                 core::dimension2d<u32>(MINIMAP_MAX_SX, MINIMAP_MAX_SY));
 251         data->minimap_overlay_square = m_tsrc->getTexture("minimap_overlay_square.png");
 252
 253         // Create player marker texture
 254         data->player_marker = m_tsrc->getTexture("player_marker.png");
 255         // Create object marker texture
 256         data->object_marker_red = m_tsrc->getTexture("object_marker_red.png");
 257
 258         // Create mesh buffer for minimap
 259         m_meshbuffer = getMinimapMeshBuffer();
 260
 261         // Initialize and start thread
 262         m_minimap_update_thread = new MinimapUpdateThread();
 263         m_minimap_update_thread->data = data;
 264         m_minimap_update_thread->start();
 265 }
 266
 267 Mapper::~Mapper()
 268 {
 269         m_minimap_update_thread->stop();
 270         m_minimap_update_thread->wait();
 271
 272         m_meshbuffer->drop();
 273
 274         data->minimap_mask_round->drop();
 275         data->minimap_mask_square->drop();
 276
 277         driver->removeTexture(data->texture);
 278         driver->removeTexture(data->heightmap_texture);
 279         driver->removeTexture(data->minimap_overlay_round);
 280         driver->removeTexture(data->minimap_overlay_square);
 281         driver->removeTexture(data->object_marker_red);
 282
 283         delete data;
 284         delete m_minimap_update_thread;
 285 }
 286
 287 void Mapper::addBlock(v3s16 pos, MinimapMapblock *data)
 288 {
 289         m_minimap_update_thread->enqueueBlock(pos, data);
 290 }
 291
 292 MinimapMode Mapper::getMinimapMode()
 293 {
 294         return data->mode;
 295 }
 296
 297 void Mapper::toggleMinimapShape()
 298 {
 299         MutexAutoLock lock(m_mutex);
 300
 301         data->minimap_shape_round = !data->minimap_shape_round;
 302         g_settings->setBool("minimap_shape_round", data->minimap_shape_round);
 303         m_minimap_update_thread->deferUpdate();
 304 }
 305
 306 void Mapper::setMinimapMode(MinimapMode mode)
 307 {
 308         static const MinimapModeDef modedefs[MINIMAP_MODE_COUNT] = {
 309                 {false, 0, 0},
 310                 {false, m_surface_mode_scan_height, 256},
 311                 {false, m_surface_mode_scan_height, 128},
 312                 {false, m_surface_mode_scan_height, 64},
 313                 {true, 32, 128},
 314                 {true, 32, 64},
 315                 {true, 32, 32}
 316         };
 317
 318         if (mode >= MINIMAP_MODE_COUNT)
 319                 return;
 320
 321         MutexAutoLock lock(m_mutex);
 322
 323         data->is_radar    = modedefs[mode].is_radar;
 324         data->scan_height = modedefs[mode].scan_height;
 325         data->map_size    = modedefs[mode].map_size;
 326         data->mode        = mode;
 327
 328         m_minimap_update_thread->deferUpdate();
 329 }
 330
 331 void Mapper::setPos(v3s16 pos)
 332 {
 333         bool do_update = false;
 334
 335         {
 336                 MutexAutoLock lock(m_mutex);
 337
 338                 if (pos != data->old_pos) {
 339                         data->old_pos = data->pos;
 340                         data->pos = pos;
 341                         do_update = true;
 342                 }
 343         }
 344
 345         if (do_update)
 346                 m_minimap_update_thread->deferUpdate();
 347 }
 348
 349 void Mapper::setAngle(f32 angle)
 350 {
 351         m_angle = angle;
 352 }
 353
 354 void Mapper::blitMinimapPixelsToImageRadar(video::IImage *map_image)
 355 {
 356         for (s16 x = 0; x < data->map_size; x++)
 357         for (s16 z = 0; z < data->map_size; z++) {
 358                 MinimapPixel *mmpixel = &data->minimap_scan[x + z * data->map_size];
 359
 360                 video::SColor c(240, 0, 0, 0);
 361                 if (mmpixel->air_count > 0)
 362                         c.setGreen(core::clamp(core::round32(32 + mmpixel->air_count * 8), 0, 255));
 363
 364                 map_image->setPixel(x, data->map_size - z - 1, c);
 365         }
 366 }
 367
 368 void Mapper::blitMinimapPixelsToImageSurface(
 369         video::IImage *map_image, video::IImage *heightmap_image)
 370 {
 371         for (s16 x = 0; x < data->map_size; x++)
 372         for (s16 z = 0; z < data->map_size; z++) {
 373                 MinimapPixel *mmpixel = &data->minimap_scan[x + z * data->map_size];
 374
 375                 const ContentFeatures &f = m_ndef->get(mmpixel->n);
 376                 const TileDef *tile = &f.tiledef[0];
 377                 // Color of the 0th tile (mostly this is the topmost)
 378                 video::SColor tilecolor;
 379                 if(tile->has_color)
 380                         tilecolor = tile->color;
 381                 else
 382                         mmpixel->n.getColor(f, &tilecolor);
 383                 tilecolor.setRed(tilecolor.getRed() * f.minimap_color.getRed() / 255);
 384                 tilecolor.setGreen(tilecolor.getGreen() * f.minimap_color.getGreen()
 385                         / 255);
 386                 tilecolor.setBlue(tilecolor.getBlue() * f.minimap_color.getBlue() / 255);
 387                 tilecolor.setAlpha(240);
 388
 389                 map_image->setPixel(x, data->map_size - z - 1, tilecolor);
 390
 391                 u32 h = mmpixel->height;
 392                 heightmap_image->setPixel(x,data->map_size - z - 1,
 393                         video::SColor(255, h, h, h));
 394         }
 395 }
 396
 397 video::ITexture *Mapper::getMinimapTexture()
 398 {
 399         // update minimap textures when new scan is ready
 400         if (data->map_invalidated)
 401                 return data->texture;
 402
 403         // create minimap and heightmap images in memory
 404         core::dimension2d<u32> dim(data->map_size, data->map_size);
 405         video::IImage *map_image       = driver->createImage(video::ECF_A8R8G8B8, dim);
 406         video::IImage *heightmap_image = driver->createImage(video::ECF_A8R8G8B8, dim);
 407         video::IImage *minimap_image   = driver->createImage(video::ECF_A8R8G8B8,
 408                 core::dimension2d<u32>(MINIMAP_MAX_SX, MINIMAP_MAX_SY));
 409
 410         // Blit MinimapPixels to images
 411         if (data->is_radar)
 412                 blitMinimapPixelsToImageRadar(map_image);
 413         else
 414                 blitMinimapPixelsToImageSurface(map_image, heightmap_image);
 415
 416         map_image->copyToScaling(minimap_image);
 417         map_image->drop();
 418
 419         video::IImage *minimap_mask = data->minimap_shape_round ?
 420                 data->minimap_mask_round : data->minimap_mask_square;
 421
 422         if (minimap_mask) {
 423                 for (s16 y = 0; y < MINIMAP_MAX_SY; y++)
 424                 for (s16 x = 0; x < MINIMAP_MAX_SX; x++) {
 425                         video::SColor mask_col = minimap_mask->getPixel(x, y);
 426                         if (!mask_col.getAlpha())
 427                                 minimap_image->setPixel(x, y, video::SColor(0,0,0,0));
 428                 }
 429         }
 430
 431         if (data->texture)
 432                 driver->removeTexture(data->texture);
 433         if (data->heightmap_texture)
 434                 driver->removeTexture(data->heightmap_texture);
 435
 436         data->texture = driver->addTexture("minimap__", minimap_image);
 437         data->heightmap_texture =
 438                 driver->addTexture("minimap_heightmap__", heightmap_image);
 439         minimap_image->drop();
 440         heightmap_image->drop();
 441
 442         data->map_invalidated = true;
 443
 444         return data->texture;
 445 }
 446
 447 v3f Mapper::getYawVec()
 448 {
 449         if (data->minimap_shape_round) {
 450                 return v3f(
 451                         cos(m_angle * core::DEGTORAD),
 452                         sin(m_angle * core::DEGTORAD),
 453                         1.0);
 454         } else {
 455                 return v3f(1.0, 0.0, 1.0);
 456         }
 457 }
 458
 459 scene::SMeshBuffer *Mapper::getMinimapMeshBuffer()
 460 {
 461         scene::SMeshBuffer *buf = new scene::SMeshBuffer();
 462         buf->Vertices.set_used(4);
 463         buf->Indices.set_used(6);
 464         video::SColor c(255, 255, 255, 255);
 465
 466         buf->Vertices[0] = video::S3DVertex(-1, -1, 0, 0, 0, 1, c, 0, 1);
 467         buf->Vertices[1] = video::S3DVertex(-1,  1, 0, 0, 0, 1, c, 0, 0);
 468         buf->Vertices[2] = video::S3DVertex( 1,  1, 0, 0, 0, 1, c, 1, 0);
 469         buf->Vertices[3] = video::S3DVertex( 1, -1, 0, 0, 0, 1, c, 1, 1);
 470
 471         buf->Indices[0] = 0;
 472         buf->Indices[1] = 1;
 473         buf->Indices[2] = 2;
 474         buf->Indices[3] = 2;
 475         buf->Indices[4] = 3;
 476         buf->Indices[5] = 0;
 477
 478         return buf;
 479 }
 480
 481 void Mapper::drawMinimap()
 482 {
 483         video::ITexture *minimap_texture = getMinimapTexture();
 484         if (!minimap_texture)
 485                 return;
 486
 487         updateActiveMarkers();
 488         v2u32 screensize = porting::getWindowSize();
 489         const u32 size = 0.25 * screensize.Y;
 490
 491         core::rect<s32> oldViewPort = driver->getViewPort();
 492         core::matrix4 oldProjMat = driver->getTransform(video::ETS_PROJECTION);
 493         core::matrix4 oldViewMat = driver->getTransform(video::ETS_VIEW);
 494
 495         driver->setViewPort(core::rect<s32>(
 496                 screensize.X - size - 10, 10,
 497                 screensize.X - 10, size + 10));
 498         driver->setTransform(video::ETS_PROJECTION, core::matrix4());
 499         driver->setTransform(video::ETS_VIEW, core::matrix4());
 500
 501         core::matrix4 matrix;
 502         matrix.makeIdentity();
 503
 504         video::SMaterial &material = m_meshbuffer->getMaterial();
 505         material.setFlag(video::EMF_TRILINEAR_FILTER, true);
 506         material.Lighting = false;
 507         material.TextureLayer[0].Texture = minimap_texture;
 508         material.TextureLayer[1].Texture = data->heightmap_texture;
 509
 510         if (m_enable_shaders && !data->is_radar) {
 511                 u16 sid = m_shdrsrc->getShader("minimap_shader", 1, 1);
 512                 material.MaterialType = m_shdrsrc->getShaderInfo(sid).material;
 513         } else {
 514                 material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 515         }
 516
 517         if (data->minimap_shape_round)
 518                 matrix.setRotationDegrees(core::vector3df(0, 0, 360 - m_angle));
 519
 520         // Draw minimap
 521         driver->setTransform(video::ETS_WORLD, matrix);
 522         driver->setMaterial(material);
 523         driver->drawMeshBuffer(m_meshbuffer);
 524
 525         // Draw overlay
 526         video::ITexture *minimap_overlay = data->minimap_shape_round ?
 527                 data->minimap_overlay_round : data->minimap_overlay_square;
 528         material.TextureLayer[0].Texture = minimap_overlay;
 529         material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 530         driver->setMaterial(material);
 531         driver->drawMeshBuffer(m_meshbuffer);
 532
 533         // If round minimap, draw player marker
 534         if (!data->minimap_shape_round) {
 535                 matrix.setRotationDegrees(core::vector3df(0, 0, m_angle));
 536                 material.TextureLayer[0].Texture = data->player_marker;
 537
 538                 driver->setTransform(video::ETS_WORLD, matrix);
 539                 driver->setMaterial(material);
 540                 driver->drawMeshBuffer(m_meshbuffer);
 541         }
 542
 543         // Reset transformations
 544         driver->setTransform(video::ETS_VIEW, oldViewMat);
 545         driver->setTransform(video::ETS_PROJECTION, oldProjMat);
 546         driver->setViewPort(oldViewPort);
 547
 548         // Draw player markers
 549         v2s32 s_pos(screensize.X - size - 10, 10);
 550         core::dimension2di imgsize(data->object_marker_red->getOriginalSize());
 551         core::rect<s32> img_rect(0, 0, imgsize.Width, imgsize.Height);
 552         static const video::SColor col(255, 255, 255, 255);
 553         static const video::SColor c[4] = {col, col, col, col};
 554         f32 sin_angle = sin(m_angle * core::DEGTORAD);
 555         f32 cos_angle = cos(m_angle * core::DEGTORAD);
 556         s32 marker_size2 =  0.025 * (float)size;
 557         for (std::list<v2f>::const_iterator
 558                         i = m_active_markers.begin();
 559                         i != m_active_markers.end(); ++i) {
 560                 v2f posf = *i;
 561                 if (data->minimap_shape_round) {
 562                         f32 t1 = posf.X * cos_angle - posf.Y * sin_angle;
 563                         f32 t2 = posf.X * sin_angle + posf.Y * cos_angle;
 564                         posf.X = t1;
 565                         posf.Y = t2;
 566                 }
 567                 posf.X = (posf.X + 0.5) * (float)size;
 568                 posf.Y = (posf.Y + 0.5) * (float)size;
 569                 core::rect<s32> dest_rect(
 570                         s_pos.X + posf.X - marker_size2,
 571                         s_pos.Y + posf.Y - marker_size2,
 572                         s_pos.X + posf.X + marker_size2,
 573                         s_pos.Y + posf.Y + marker_size2);
 574                 driver->draw2DImage(data->object_marker_red, dest_rect,
 575                         img_rect, &dest_rect, &c[0], true);
 576         }
 577 }
 578
 579 void Mapper::updateActiveMarkers ()
 580 {
 581         video::IImage *minimap_mask = data->minimap_shape_round ?
 582                 data->minimap_mask_round : data->minimap_mask_square;
 583
 584         std::list<Nametag *> *nametags = client->getCamera()->getNametags();
 585
 586         m_active_markers.clear();
 587
 588         for (std::list<Nametag *>::const_iterator
 589                         i = nametags->begin();
 590                         i != nametags->end(); ++i) {
 591                 Nametag *nametag = *i;
 592                 v3s16 pos = floatToInt(nametag->parent_node->getPosition() +
 593                         intToFloat(client->getCamera()->getOffset(), BS), BS);
 594                 pos -= data->pos - v3s16(data->map_size / 2,
 595                                 data->scan_height / 2,
 596                                 data->map_size / 2);
 597                 if (pos.X < 0 || pos.X > data->map_size ||
 598                                 pos.Y < 0 || pos.Y > data->scan_height ||
 599                                 pos.Z < 0 || pos.Z > data->map_size) {
 600                         continue;
 601                 }
 602                 pos.X = ((float)pos.X / data->map_size) * MINIMAP_MAX_SX;
 603                 pos.Z = ((float)pos.Z / data->map_size) * MINIMAP_MAX_SY;
 604                 video::SColor mask_col = minimap_mask->getPixel(pos.X, pos.Z);
 605                 if (!mask_col.getAlpha()) {
 606                         continue;
 607                 }
 608                 m_active_markers.push_back(v2f(((float)pos.X / (float)MINIMAP_MAX_SX) - 0.5,
 609                         (1.0 - (float)pos.Z / (float)MINIMAP_MAX_SY) - 0.5));
 610         }
 611 }
 612
 613 ////
 614 //// MinimapMapblock
 615 ////
 616
 617 void MinimapMapblock::getMinimapNodes(VoxelManipulator *vmanip, v3s16 pos)
 618 {
 619
 620         for (s16 x = 0; x < MAP_BLOCKSIZE; x++)
 621         for (s16 z = 0; z < MAP_BLOCKSIZE; z++) {
 622                 s16 air_count = 0;
 623                 bool surface_found = false;
 624                 MinimapPixel *mmpixel = &data[z * MAP_BLOCKSIZE + x];
 625
 626                 for (s16 y = MAP_BLOCKSIZE -1; y >= 0; y--) {
 627                         v3s16 p(x, y, z);
 628                         MapNode n = vmanip->getNodeNoEx(pos + p);
 629                         if (!surface_found && n.getContent() != CONTENT_AIR) {
 630                                 mmpixel->height = y;
 631                                 mmpixel->n = n;
 632                                 surface_found = true;
 633                         } else if (n.getContent() == CONTENT_AIR) {
 634                                 air_count++;
 635                         }
 636                 }
 637
 638                 if (!surface_found)
 639                         mmpixel->n = MapNode(CONTENT_AIR);
 640
 641                 mmpixel->air_count = air_count;
 642         }
 643 }