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);
 124                 data->map_invalidated = false;
 125         }
 126 }
 127
 128 void MinimapUpdateThread::getMap(v3s16 pos, s16 size, s16 height)
 129 {
 130         v3s16 region(size, 0, size);
 131         v3s16 pos_min(pos.X - size / 2, pos.Y - height / 2, pos.Z - size / 2);
 132         v3s16 pos_max(pos_min.X + size - 1, pos.Y + height / 2, pos_min.Z + size - 1);
 133         v3s16 blockpos_min = getNodeBlockPos(pos_min);
 134         v3s16 blockpos_max = getNodeBlockPos(pos_max);
 135
 136 // clear the map
 137         for (int z = 0; z < size; z++)
 138         for (int x = 0; x < size; x++) {
 139                 MinimapPixel &mmpixel = data->minimap_scan[x + z * size];
 140                 mmpixel.air_count = 0;
 141                 mmpixel.height = 0;
 142                 mmpixel.n = MapNode(CONTENT_AIR);
 143         }
 144
 145 // draw the map
 146         v3s16 blockpos;
 147         for (blockpos.Z = blockpos_min.Z; blockpos.Z <= blockpos_max.Z; ++blockpos.Z)
 148         for (blockpos.Y = blockpos_min.Y; blockpos.Y <= blockpos_max.Y; ++blockpos.Y)
 149         for (blockpos.X = blockpos_min.X; blockpos.X <= blockpos_max.X; ++blockpos.X) {
 150                 std::map<v3s16, MinimapMapblock *>::const_iterator pblock =
 151                         m_blocks_cache.find(blockpos);
 152                 if (pblock == m_blocks_cache.end())
 153                         continue;
 154                 const MinimapMapblock &block = *pblock->second;
 155
 156                 v3s16 block_node_min(blockpos * MAP_BLOCKSIZE);
 157                 v3s16 block_node_max(block_node_min + MAP_BLOCKSIZE - 1);
 158                 // clip
 159                 v3s16 range_min = componentwise_max(block_node_min, pos_min);
 160                 v3s16 range_max = componentwise_min(block_node_max, pos_max);
 161
 162                 v3s16 pos;
 163                 pos.Y = range_min.Y;
 164                 for (pos.Z = range_min.Z; pos.Z <= range_max.Z; ++pos.Z)
 165                 for (pos.X = range_min.X; pos.X <= range_max.X; ++pos.X) {
 166                         v3s16 inblock_pos = pos - block_node_min;
 167                         const MinimapPixel &in_pixel =
 168                                 block.data[inblock_pos.Z * MAP_BLOCKSIZE + inblock_pos.X];
 169
 170                         v3s16 inmap_pos = pos - pos_min;
 171                         MinimapPixel &out_pixel =
 172                                 data->minimap_scan[inmap_pos.X + inmap_pos.Z * size];
 173
 174                         out_pixel.air_count += in_pixel.air_count;
 175                         if (in_pixel.n.param0 != CONTENT_AIR) {
 176                                 out_pixel.n = in_pixel.n;
 177                                 out_pixel.height = inmap_pos.Y + in_pixel.height;
 178                         }
 179                 }
 180         }
 181 }
 182
 183 ////
 184 //// Mapper
 185 ////
 186
 187 Minimap::Minimap(IrrlichtDevice *device, Client *client)
 188 {
 189         this->client    = client;
 190         this->driver    = device->getVideoDriver();
 191         this->m_tsrc    = client->getTextureSource();
 192         this->m_shdrsrc = client->getShaderSource();
 193         this->m_ndef    = client->getNodeDefManager();
 194
 195         m_angle = 0.f;
 196
 197         // Initialize static settings
 198         m_enable_shaders = g_settings->getBool("enable_shaders");
 199         m_surface_mode_scan_height =
 200                 g_settings->getBool("minimap_double_scan_height") ? 256 : 128;
 201
 202         // Initialize minimap data
 203         data = new MinimapData;
 204         data->mode              = MINIMAP_MODE_OFF;
 205         data->is_radar          = false;
 206         data->map_invalidated   = true;
 207         data->heightmap_image   = NULL;
 208         data->minimap_image     = NULL;
 209         data->texture           = NULL;
 210         data->heightmap_texture = NULL;
 211         data->minimap_shape_round = g_settings->getBool("minimap_shape_round");
 212
 213         // Get round minimap textures
 214         data->minimap_mask_round = driver->createImage(
 215                 m_tsrc->getTexture("minimap_mask_round.png"),
 216                 core::position2d<s32>(0, 0),
 217                 core::dimension2d<u32>(MINIMAP_MAX_SX, MINIMAP_MAX_SY));
 218         data->minimap_overlay_round = m_tsrc->getTexture("minimap_overlay_round.png");
 219
 220         // Get square minimap textures
 221         data->minimap_mask_square = driver->createImage(
 222                 m_tsrc->getTexture("minimap_mask_square.png"),
 223                 core::position2d<s32>(0, 0),
 224                 core::dimension2d<u32>(MINIMAP_MAX_SX, MINIMAP_MAX_SY));
 225         data->minimap_overlay_square = m_tsrc->getTexture("minimap_overlay_square.png");
 226
 227         // Create player marker texture
 228         data->player_marker = m_tsrc->getTexture("player_marker.png");
 229         // Create object marker texture
 230         data->object_marker_red = m_tsrc->getTexture("object_marker_red.png");
 231
 232         // Create mesh buffer for minimap
 233         m_meshbuffer = getMinimapMeshBuffer();
 234
 235         // Initialize and start thread
 236         m_minimap_update_thread = new MinimapUpdateThread();
 237         m_minimap_update_thread->data = data;
 238         m_minimap_update_thread->start();
 239 }
 240
 241 Minimap::~Minimap()
 242 {
 243         m_minimap_update_thread->stop();
 244         m_minimap_update_thread->wait();
 245
 246         m_meshbuffer->drop();
 247
 248         data->minimap_mask_round->drop();
 249         data->minimap_mask_square->drop();
 250
 251         driver->removeTexture(data->texture);
 252         driver->removeTexture(data->heightmap_texture);
 253         driver->removeTexture(data->minimap_overlay_round);
 254         driver->removeTexture(data->minimap_overlay_square);
 255         driver->removeTexture(data->object_marker_red);
 256
 257         delete data;
 258         delete m_minimap_update_thread;
 259 }
 260
 261 void Minimap::addBlock(v3s16 pos, MinimapMapblock *data)
 262 {
 263         m_minimap_update_thread->enqueueBlock(pos, data);
 264 }
 265
 266 void Minimap::toggleMinimapShape()
 267 {
 268         MutexAutoLock lock(m_mutex);
 269
 270         data->minimap_shape_round = !data->minimap_shape_round;
 271         g_settings->setBool("minimap_shape_round", data->minimap_shape_round);
 272         m_minimap_update_thread->deferUpdate();
 273 }
 274
 275 void Minimap::setMinimapMode(MinimapMode mode)
 276 {
 277         static const MinimapModeDef modedefs[MINIMAP_MODE_COUNT] = {
 278                 {false, 0, 0},
 279                 {false, m_surface_mode_scan_height, 256},
 280                 {false, m_surface_mode_scan_height, 128},
 281                 {false, m_surface_mode_scan_height, 64},
 282                 {true, 32, 128},
 283                 {true, 32, 64},
 284                 {true, 32, 32}
 285         };
 286
 287         if (mode >= MINIMAP_MODE_COUNT)
 288                 return;
 289
 290         MutexAutoLock lock(m_mutex);
 291
 292         data->is_radar    = modedefs[mode].is_radar;
 293         data->scan_height = modedefs[mode].scan_height;
 294         data->map_size    = modedefs[mode].map_size;
 295         data->mode        = mode;
 296
 297         m_minimap_update_thread->deferUpdate();
 298 }
 299
 300 void Minimap::setPos(v3s16 pos)
 301 {
 302         bool do_update = false;
 303
 304         {
 305                 MutexAutoLock lock(m_mutex);
 306
 307                 if (pos != data->old_pos) {
 308                         data->old_pos = data->pos;
 309                         data->pos = pos;
 310                         do_update = true;
 311                 }
 312         }
 313
 314         if (do_update)
 315                 m_minimap_update_thread->deferUpdate();
 316 }
 317
 318 void Minimap::setAngle(f32 angle)
 319 {
 320         m_angle = angle;
 321 }
 322
 323 void Minimap::blitMinimapPixelsToImageRadar(video::IImage *map_image)
 324 {
 325         for (s16 x = 0; x < data->map_size; x++)
 326         for (s16 z = 0; z < data->map_size; z++) {
 327                 MinimapPixel *mmpixel = &data->minimap_scan[x + z * data->map_size];
 328
 329                 video::SColor c(240, 0, 0, 0);
 330                 if (mmpixel->air_count > 0)
 331                         c.setGreen(core::clamp(core::round32(32 + mmpixel->air_count * 8), 0, 255));
 332
 333                 map_image->setPixel(x, data->map_size - z - 1, c);
 334         }
 335 }
 336
 337 void Minimap::blitMinimapPixelsToImageSurface(
 338         video::IImage *map_image, video::IImage *heightmap_image)
 339 {
 340         for (s16 x = 0; x < data->map_size; x++)
 341         for (s16 z = 0; z < data->map_size; z++) {
 342                 MinimapPixel *mmpixel = &data->minimap_scan[x + z * data->map_size];
 343
 344                 const ContentFeatures &f = m_ndef->get(mmpixel->n);
 345                 const TileDef *tile = &f.tiledef[0];
 346                 // Color of the 0th tile (mostly this is the topmost)
 347                 video::SColor tilecolor;
 348                 if(tile->has_color)
 349                         tilecolor = tile->color;
 350                 else
 351                         mmpixel->n.getColor(f, &tilecolor);
 352                 tilecolor.setRed(tilecolor.getRed() * f.minimap_color.getRed() / 255);
 353                 tilecolor.setGreen(tilecolor.getGreen() * f.minimap_color.getGreen()
 354                         / 255);
 355                 tilecolor.setBlue(tilecolor.getBlue() * f.minimap_color.getBlue() / 255);
 356                 tilecolor.setAlpha(240);
 357
 358                 map_image->setPixel(x, data->map_size - z - 1, tilecolor);
 359
 360                 u32 h = mmpixel->height;
 361                 heightmap_image->setPixel(x,data->map_size - z - 1,
 362                         video::SColor(255, h, h, h));
 363         }
 364 }
 365
 366 video::ITexture *Minimap::getMinimapTexture()
 367 {
 368         // update minimap textures when new scan is ready
 369         if (data->map_invalidated)
 370                 return data->texture;
 371
 372         // create minimap and heightmap images in memory
 373         core::dimension2d<u32> dim(data->map_size, data->map_size);
 374         video::IImage *map_image       = driver->createImage(video::ECF_A8R8G8B8, dim);
 375         video::IImage *heightmap_image = driver->createImage(video::ECF_A8R8G8B8, dim);
 376         video::IImage *minimap_image   = driver->createImage(video::ECF_A8R8G8B8,
 377                 core::dimension2d<u32>(MINIMAP_MAX_SX, MINIMAP_MAX_SY));
 378
 379         // Blit MinimapPixels to images
 380         if (data->is_radar)
 381                 blitMinimapPixelsToImageRadar(map_image);
 382         else
 383                 blitMinimapPixelsToImageSurface(map_image, heightmap_image);
 384
 385         map_image->copyToScaling(minimap_image);
 386         map_image->drop();
 387
 388         video::IImage *minimap_mask = data->minimap_shape_round ?
 389                 data->minimap_mask_round : data->minimap_mask_square;
 390
 391         if (minimap_mask) {
 392                 for (s16 y = 0; y < MINIMAP_MAX_SY; y++)
 393                 for (s16 x = 0; x < MINIMAP_MAX_SX; x++) {
 394                         video::SColor mask_col = minimap_mask->getPixel(x, y);
 395                         if (!mask_col.getAlpha())
 396                                 minimap_image->setPixel(x, y, video::SColor(0,0,0,0));
 397                 }
 398         }
 399
 400         if (data->texture)
 401                 driver->removeTexture(data->texture);
 402         if (data->heightmap_texture)
 403                 driver->removeTexture(data->heightmap_texture);
 404
 405         data->texture = driver->addTexture("minimap__", minimap_image);
 406         data->heightmap_texture =
 407                 driver->addTexture("minimap_heightmap__", heightmap_image);
 408         minimap_image->drop();
 409         heightmap_image->drop();
 410
 411         data->map_invalidated = true;
 412
 413         return data->texture;
 414 }
 415
 416 v3f Minimap::getYawVec()
 417 {
 418         if (data->minimap_shape_round) {
 419                 return v3f(
 420                         cos(m_angle * core::DEGTORAD),
 421                         sin(m_angle * core::DEGTORAD),
 422                         1.0);
 423         } else {
 424                 return v3f(1.0, 0.0, 1.0);
 425         }
 426 }
 427
 428 scene::SMeshBuffer *Minimap::getMinimapMeshBuffer()
 429 {
 430         scene::SMeshBuffer *buf = new scene::SMeshBuffer();
 431         buf->Vertices.set_used(4);
 432         buf->Indices.set_used(6);
 433         video::SColor c(255, 255, 255, 255);
 434
 435         buf->Vertices[0] = video::S3DVertex(-1, -1, 0, 0, 0, 1, c, 0, 1);
 436         buf->Vertices[1] = video::S3DVertex(-1,  1, 0, 0, 0, 1, c, 0, 0);
 437         buf->Vertices[2] = video::S3DVertex( 1,  1, 0, 0, 0, 1, c, 1, 0);
 438         buf->Vertices[3] = video::S3DVertex( 1, -1, 0, 0, 0, 1, c, 1, 1);
 439
 440         buf->Indices[0] = 0;
 441         buf->Indices[1] = 1;
 442         buf->Indices[2] = 2;
 443         buf->Indices[3] = 2;
 444         buf->Indices[4] = 3;
 445         buf->Indices[5] = 0;
 446
 447         return buf;
 448 }
 449
 450 void Minimap::drawMinimap()
 451 {
 452         video::ITexture *minimap_texture = getMinimapTexture();
 453         if (!minimap_texture)
 454                 return;
 455
 456         updateActiveMarkers();
 457         v2u32 screensize = porting::getWindowSize();
 458         const u32 size = 0.25 * screensize.Y;
 459
 460         core::rect<s32> oldViewPort = driver->getViewPort();
 461         core::matrix4 oldProjMat = driver->getTransform(video::ETS_PROJECTION);
 462         core::matrix4 oldViewMat = driver->getTransform(video::ETS_VIEW);
 463
 464         driver->setViewPort(core::rect<s32>(
 465                 screensize.X - size - 10, 10,
 466                 screensize.X - 10, size + 10));
 467         driver->setTransform(video::ETS_PROJECTION, core::matrix4());
 468         driver->setTransform(video::ETS_VIEW, core::matrix4());
 469
 470         core::matrix4 matrix;
 471         matrix.makeIdentity();
 472
 473         video::SMaterial &material = m_meshbuffer->getMaterial();
 474         material.setFlag(video::EMF_TRILINEAR_FILTER, true);
 475         material.Lighting = false;
 476         material.TextureLayer[0].Texture = minimap_texture;
 477         material.TextureLayer[1].Texture = data->heightmap_texture;
 478
 479         if (m_enable_shaders && !data->is_radar) {
 480                 u16 sid = m_shdrsrc->getShader("minimap_shader", 1, 1);
 481                 material.MaterialType = m_shdrsrc->getShaderInfo(sid).material;
 482         } else {
 483                 material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 484         }
 485
 486         if (data->minimap_shape_round)
 487                 matrix.setRotationDegrees(core::vector3df(0, 0, 360 - m_angle));
 488
 489         // Draw minimap
 490         driver->setTransform(video::ETS_WORLD, matrix);
 491         driver->setMaterial(material);
 492         driver->drawMeshBuffer(m_meshbuffer);
 493
 494         // Draw overlay
 495         video::ITexture *minimap_overlay = data->minimap_shape_round ?
 496                 data->minimap_overlay_round : data->minimap_overlay_square;
 497         material.TextureLayer[0].Texture = minimap_overlay;
 498         material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 499         driver->setMaterial(material);
 500         driver->drawMeshBuffer(m_meshbuffer);
 501
 502         // If round minimap, draw player marker
 503         if (!data->minimap_shape_round) {
 504                 matrix.setRotationDegrees(core::vector3df(0, 0, m_angle));
 505                 material.TextureLayer[0].Texture = data->player_marker;
 506
 507                 driver->setTransform(video::ETS_WORLD, matrix);
 508                 driver->setMaterial(material);
 509                 driver->drawMeshBuffer(m_meshbuffer);
 510         }
 511
 512         // Reset transformations
 513         driver->setTransform(video::ETS_VIEW, oldViewMat);
 514         driver->setTransform(video::ETS_PROJECTION, oldProjMat);
 515         driver->setViewPort(oldViewPort);
 516
 517         // Draw player markers
 518         v2s32 s_pos(screensize.X - size - 10, 10);
 519         core::dimension2di imgsize(data->object_marker_red->getOriginalSize());
 520         core::rect<s32> img_rect(0, 0, imgsize.Width, imgsize.Height);
 521         static const video::SColor col(255, 255, 255, 255);
 522         static const video::SColor c[4] = {col, col, col, col};
 523         f32 sin_angle = sin(m_angle * core::DEGTORAD);
 524         f32 cos_angle = cos(m_angle * core::DEGTORAD);
 525         s32 marker_size2 =  0.025 * (float)size;
 526         for (std::list<v2f>::const_iterator
 527                         i = m_active_markers.begin();
 528                         i != m_active_markers.end(); ++i) {
 529                 v2f posf = *i;
 530                 if (data->minimap_shape_round) {
 531                         f32 t1 = posf.X * cos_angle - posf.Y * sin_angle;
 532                         f32 t2 = posf.X * sin_angle + posf.Y * cos_angle;
 533                         posf.X = t1;
 534                         posf.Y = t2;
 535                 }
 536                 posf.X = (posf.X + 0.5) * (float)size;
 537                 posf.Y = (posf.Y + 0.5) * (float)size;
 538                 core::rect<s32> dest_rect(
 539                         s_pos.X + posf.X - marker_size2,
 540                         s_pos.Y + posf.Y - marker_size2,
 541                         s_pos.X + posf.X + marker_size2,
 542                         s_pos.Y + posf.Y + marker_size2);
 543                 driver->draw2DImage(data->object_marker_red, dest_rect,
 544                         img_rect, &dest_rect, &c[0], true);
 545         }
 546 }
 547
 548 void Minimap::updateActiveMarkers()
 549 {
 550         video::IImage *minimap_mask = data->minimap_shape_round ?
 551                 data->minimap_mask_round : data->minimap_mask_square;
 552
 553         std::list<Nametag *> *nametags = client->getCamera()->getNametags();
 554
 555         m_active_markers.clear();
 556
 557         for (std::list<Nametag *>::const_iterator
 558                         i = nametags->begin();
 559                         i != nametags->end(); ++i) {
 560                 Nametag *nametag = *i;
 561                 v3s16 pos = floatToInt(nametag->parent_node->getPosition() +
 562                         intToFloat(client->getCamera()->getOffset(), BS), BS);
 563                 pos -= data->pos - v3s16(data->map_size / 2,
 564                                 data->scan_height / 2,
 565                                 data->map_size / 2);
 566                 if (pos.X < 0 || pos.X > data->map_size ||
 567                                 pos.Y < 0 || pos.Y > data->scan_height ||
 568                                 pos.Z < 0 || pos.Z > data->map_size) {
 569                         continue;
 570                 }
 571                 pos.X = ((float)pos.X / data->map_size) * MINIMAP_MAX_SX;
 572                 pos.Z = ((float)pos.Z / data->map_size) * MINIMAP_MAX_SY;
 573                 video::SColor mask_col = minimap_mask->getPixel(pos.X, pos.Z);
 574                 if (!mask_col.getAlpha()) {
 575                         continue;
 576                 }
 577                 m_active_markers.push_back(v2f(((float)pos.X / (float)MINIMAP_MAX_SX) - 0.5,
 578                         (1.0 - (float)pos.Z / (float)MINIMAP_MAX_SY) - 0.5));
 579         }
 580 }
 581
 582 ////
 583 //// MinimapMapblock
 584 ////
 585
 586 void MinimapMapblock::getMinimapNodes(VoxelManipulator *vmanip, v3s16 pos)
 587 {
 588
 589         for (s16 x = 0; x < MAP_BLOCKSIZE; x++)
 590         for (s16 z = 0; z < MAP_BLOCKSIZE; z++) {
 591                 s16 air_count = 0;
 592                 bool surface_found = false;
 593                 MinimapPixel *mmpixel = &data[z * MAP_BLOCKSIZE + x];
 594
 595                 for (s16 y = MAP_BLOCKSIZE -1; y >= 0; y--) {
 596                         v3s16 p(x, y, z);
 597                         MapNode n = vmanip->getNodeNoEx(pos + p);
 598                         if (!surface_found && n.getContent() != CONTENT_AIR) {
 599                                 mmpixel->height = y;
 600                                 mmpixel->n = n;
 601                                 surface_found = true;
 602                         } else if (n.getContent() == CONTENT_AIR) {
 603                                 air_count++;
 604                         }
 605                 }
 606
 607                 if (!surface_found)
 608                         mmpixel->n = MapNode(CONTENT_AIR);
 609
 610                 mmpixel->air_count = air_count;
 611         }
 612 }