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