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->id != 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                 u16 id = 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                                 id = cached_pixel->id;
 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->id = id;
 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                 video::SColor c = m_ndef->get(mmpixel->id).minimap_color;
 376                 c.setAlpha(240);
 377
 378                 map_image->setPixel(x, data->map_size - z - 1, c);
 379
 380                 u32 h = mmpixel->height;
 381                 heightmap_image->setPixel(x,data->map_size - z - 1,
 382                         video::SColor(255, h, h, h));
 383         }
 384 }
 385
 386 video::ITexture *Mapper::getMinimapTexture()
 387 {
 388         // update minimap textures when new scan is ready
 389         if (data->map_invalidated)
 390                 return data->texture;
 391
 392         // create minimap and heightmap images in memory
 393         core::dimension2d<u32> dim(data->map_size, data->map_size);
 394         video::IImage *map_image       = driver->createImage(video::ECF_A8R8G8B8, dim);
 395         video::IImage *heightmap_image = driver->createImage(video::ECF_A8R8G8B8, dim);
 396         video::IImage *minimap_image   = driver->createImage(video::ECF_A8R8G8B8,
 397                 core::dimension2d<u32>(MINIMAP_MAX_SX, MINIMAP_MAX_SY));
 398
 399         // Blit MinimapPixels to images
 400         if (data->is_radar)
 401                 blitMinimapPixelsToImageRadar(map_image);
 402         else
 403                 blitMinimapPixelsToImageSurface(map_image, heightmap_image);
 404
 405         map_image->copyToScaling(minimap_image);
 406         map_image->drop();
 407
 408         video::IImage *minimap_mask = data->minimap_shape_round ?
 409                 data->minimap_mask_round : data->minimap_mask_square;
 410
 411         if (minimap_mask) {
 412                 for (s16 y = 0; y < MINIMAP_MAX_SY; y++)
 413                 for (s16 x = 0; x < MINIMAP_MAX_SX; x++) {
 414                         video::SColor mask_col = minimap_mask->getPixel(x, y);
 415                         if (!mask_col.getAlpha())
 416                                 minimap_image->setPixel(x, y, video::SColor(0,0,0,0));
 417                 }
 418         }
 419
 420         if (data->texture)
 421                 driver->removeTexture(data->texture);
 422         if (data->heightmap_texture)
 423                 driver->removeTexture(data->heightmap_texture);
 424
 425         data->texture = driver->addTexture("minimap__", minimap_image);
 426         data->heightmap_texture =
 427                 driver->addTexture("minimap_heightmap__", heightmap_image);
 428         minimap_image->drop();
 429         heightmap_image->drop();
 430
 431         data->map_invalidated = true;
 432
 433         return data->texture;
 434 }
 435
 436 v3f Mapper::getYawVec()
 437 {
 438         if (data->minimap_shape_round) {
 439                 return v3f(
 440                         cos(m_angle * core::DEGTORAD),
 441                         sin(m_angle * core::DEGTORAD),
 442                         1.0);
 443         } else {
 444                 return v3f(1.0, 0.0, 1.0);
 445         }
 446 }
 447
 448 scene::SMeshBuffer *Mapper::getMinimapMeshBuffer()
 449 {
 450         scene::SMeshBuffer *buf = new scene::SMeshBuffer();
 451         buf->Vertices.set_used(4);
 452         buf->Indices.set_used(6);
 453         video::SColor c(255, 255, 255, 255);
 454
 455         buf->Vertices[0] = video::S3DVertex(-1, -1, 0, 0, 0, 1, c, 0, 1);
 456         buf->Vertices[1] = video::S3DVertex(-1,  1, 0, 0, 0, 1, c, 0, 0);
 457         buf->Vertices[2] = video::S3DVertex( 1,  1, 0, 0, 0, 1, c, 1, 0);
 458         buf->Vertices[3] = video::S3DVertex( 1, -1, 0, 0, 0, 1, c, 1, 1);
 459
 460         buf->Indices[0] = 0;
 461         buf->Indices[1] = 1;
 462         buf->Indices[2] = 2;
 463         buf->Indices[3] = 2;
 464         buf->Indices[4] = 3;
 465         buf->Indices[5] = 0;
 466
 467         return buf;
 468 }
 469
 470 void Mapper::drawMinimap()
 471 {
 472         video::ITexture *minimap_texture = getMinimapTexture();
 473         if (!minimap_texture)
 474                 return;
 475
 476         updateActiveMarkers();
 477         v2u32 screensize = porting::getWindowSize();
 478         const u32 size = 0.25 * screensize.Y;
 479
 480         core::rect<s32> oldViewPort = driver->getViewPort();
 481         core::matrix4 oldProjMat = driver->getTransform(video::ETS_PROJECTION);
 482         core::matrix4 oldViewMat = driver->getTransform(video::ETS_VIEW);
 483
 484         driver->setViewPort(core::rect<s32>(
 485                 screensize.X - size - 10, 10,
 486                 screensize.X - 10, size + 10));
 487         driver->setTransform(video::ETS_PROJECTION, core::matrix4());
 488         driver->setTransform(video::ETS_VIEW, core::matrix4());
 489
 490         core::matrix4 matrix;
 491         matrix.makeIdentity();
 492
 493         video::SMaterial &material = m_meshbuffer->getMaterial();
 494         material.setFlag(video::EMF_TRILINEAR_FILTER, true);
 495         material.Lighting = false;
 496         material.TextureLayer[0].Texture = minimap_texture;
 497         material.TextureLayer[1].Texture = data->heightmap_texture;
 498
 499         if (m_enable_shaders && !data->is_radar) {
 500                 u16 sid = m_shdrsrc->getShader("minimap_shader", 1, 1);
 501                 material.MaterialType = m_shdrsrc->getShaderInfo(sid).material;
 502         } else {
 503                 material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 504         }
 505
 506         if (data->minimap_shape_round)
 507                 matrix.setRotationDegrees(core::vector3df(0, 0, 360 - m_angle));
 508
 509         // Draw minimap
 510         driver->setTransform(video::ETS_WORLD, matrix);
 511         driver->setMaterial(material);
 512         driver->drawMeshBuffer(m_meshbuffer);
 513
 514         // Draw overlay
 515         video::ITexture *minimap_overlay = data->minimap_shape_round ?
 516                 data->minimap_overlay_round : data->minimap_overlay_square;
 517         material.TextureLayer[0].Texture = minimap_overlay;
 518         material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 519         driver->setMaterial(material);
 520         driver->drawMeshBuffer(m_meshbuffer);
 521
 522         // If round minimap, draw player marker
 523         if (!data->minimap_shape_round) {
 524                 matrix.setRotationDegrees(core::vector3df(0, 0, m_angle));
 525                 material.TextureLayer[0].Texture = data->player_marker;
 526
 527                 driver->setTransform(video::ETS_WORLD, matrix);
 528                 driver->setMaterial(material);
 529                 driver->drawMeshBuffer(m_meshbuffer);
 530         }
 531
 532         // Reset transformations
 533         driver->setTransform(video::ETS_VIEW, oldViewMat);
 534         driver->setTransform(video::ETS_PROJECTION, oldProjMat);
 535         driver->setViewPort(oldViewPort);
 536
 537         // Draw player markers
 538         v2s32 s_pos(screensize.X - size - 10, 10);
 539         core::dimension2di imgsize(data->object_marker_red->getOriginalSize());
 540         core::rect<s32> img_rect(0, 0, imgsize.Width, imgsize.Height);
 541         static const video::SColor col(255, 255, 255, 255);
 542         static const video::SColor c[4] = {col, col, col, col};
 543         f32 sin_angle = sin(m_angle * core::DEGTORAD);
 544         f32 cos_angle = cos(m_angle * core::DEGTORAD);
 545         s32 marker_size2 =  0.025 * (float)size;
 546         for (std::list<v2f>::const_iterator
 547                         i = m_active_markers.begin();
 548                         i != m_active_markers.end(); ++i) {
 549                 v2f posf = *i;
 550                 if (data->minimap_shape_round) {
 551                         f32 t1 = posf.X * cos_angle - posf.Y * sin_angle;
 552                         f32 t2 = posf.X * sin_angle + posf.Y * cos_angle;
 553                         posf.X = t1;
 554                         posf.Y = t2;
 555                 }
 556                 posf.X = (posf.X + 0.5) * (float)size;
 557                 posf.Y = (posf.Y + 0.5) * (float)size;
 558                 core::rect<s32> dest_rect(
 559                         s_pos.X + posf.X - marker_size2,
 560                         s_pos.Y + posf.Y - marker_size2,
 561                         s_pos.X + posf.X + marker_size2,
 562                         s_pos.Y + posf.Y + marker_size2);
 563                 driver->draw2DImage(data->object_marker_red, dest_rect,
 564                         img_rect, &dest_rect, &c[0], true);
 565         }
 566 }
 567
 568 void Mapper::updateActiveMarkers ()
 569 {
 570         video::IImage *minimap_mask = data->minimap_shape_round ?
 571                 data->minimap_mask_round : data->minimap_mask_square;
 572
 573         std::list<Nametag *> *nametags = client->getCamera()->getNametags();
 574
 575         m_active_markers.clear();
 576
 577         for (std::list<Nametag *>::const_iterator
 578                         i = nametags->begin();
 579                         i != nametags->end(); ++i) {
 580                 Nametag *nametag = *i;
 581                 v3s16 pos = floatToInt(nametag->parent_node->getPosition() +
 582                         intToFloat(client->getCamera()->getOffset(), BS), BS);
 583                 pos -= data->pos - v3s16(data->map_size / 2,
 584                                 data->scan_height / 2,
 585                                 data->map_size / 2);
 586                 if (pos.X < 0 || pos.X > data->map_size ||
 587                                 pos.Y < 0 || pos.Y > data->scan_height ||
 588                                 pos.Z < 0 || pos.Z > data->map_size) {
 589                         continue;
 590                 }
 591                 pos.X = ((float)pos.X / data->map_size) * MINIMAP_MAX_SX;
 592                 pos.Z = ((float)pos.Z / data->map_size) * MINIMAP_MAX_SY;
 593                 video::SColor mask_col = minimap_mask->getPixel(pos.X, pos.Z);
 594                 if (!mask_col.getAlpha()) {
 595                         continue;
 596                 }
 597                 m_active_markers.push_back(v2f(((float)pos.X / (float)MINIMAP_MAX_SX) - 0.5,
 598                         (1.0 - (float)pos.Z / (float)MINIMAP_MAX_SY) - 0.5));
 599         }
 600 }
 601
 602 ////
 603 //// MinimapMapblock
 604 ////
 605
 606 void MinimapMapblock::getMinimapNodes(VoxelManipulator *vmanip, v3s16 pos)
 607 {
 608
 609         for (s16 x = 0; x < MAP_BLOCKSIZE; x++)
 610         for (s16 z = 0; z < MAP_BLOCKSIZE; z++) {
 611                 s16 air_count = 0;
 612                 bool surface_found = false;
 613                 MinimapPixel *mmpixel = &data[z * MAP_BLOCKSIZE + x];
 614
 615                 for (s16 y = MAP_BLOCKSIZE -1; y >= 0; y--) {
 616                         v3s16 p(x, y, z);
 617                         MapNode n = vmanip->getNodeNoEx(pos + p);
 618                         if (!surface_found && n.getContent() != CONTENT_AIR) {
 619                                 mmpixel->height = y;
 620                                 mmpixel->id = n.getContent();
 621                                 surface_found = true;
 622                         } else if (n.getContent() == CONTENT_AIR) {
 623                                 air_count++;
 624                         }
 625                 }
 626
 627                 if (!surface_found)
 628                         mmpixel->id = CONTENT_AIR;
 629
 630                 mmpixel->air_count = air_count;
 631         }
 632 }