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