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