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) {
 109                                 delete result.first->second;
 110                                 result.first->second = update.data;
 111                         }
 112                 } else {
 113                         std::map<v3s16, MinimapMapblock *>::iterator it;
 114                         it = m_blocks_cache.find(update.pos);
 115                         if (it != m_blocks_cache.end()) {
 116                                 delete it->second;
 117                                 m_blocks_cache.erase(it);
 118                         }
 119                 }
 120         }
 121
 122         if (data->map_invalidated && data->mode != MINIMAP_MODE_OFF) {
 123                 getMap(data->pos, data->map_size, data->scan_height);
 124                 data->map_invalidated = false;
 125         }
 126 }
 127
 128 void MinimapUpdateThread::getMap(v3s16 pos, s16 size, s16 height)
 129 {
 130         v3s16 region(size, 0, size);
 131         v3s16 pos_min(pos.X - size / 2, pos.Y - height / 2, pos.Z - size / 2);
 132         v3s16 pos_max(pos_min.X + size - 1, pos.Y + height / 2, pos_min.Z + size - 1);
 133         v3s16 blockpos_min = getNodeBlockPos(pos_min);
 134         v3s16 blockpos_max = getNodeBlockPos(pos_max);
 135
 136 // clear the map
 137         for (int z = 0; z < size; z++)
 138         for (int x = 0; x < size; x++) {
 139                 MinimapPixel &mmpixel = data->minimap_scan[x + z * size];
 140                 mmpixel.air_count = 0;
 141                 mmpixel.height = 0;
 142                 mmpixel.n = MapNode(CONTENT_AIR);
 143         }
 144
 145 // draw the map
 146         v3s16 blockpos;
 147         for (blockpos.Z = blockpos_min.Z; blockpos.Z <= blockpos_max.Z; ++blockpos.Z)
 148         for (blockpos.Y = blockpos_min.Y; blockpos.Y <= blockpos_max.Y; ++blockpos.Y)
 149         for (blockpos.X = blockpos_min.X; blockpos.X <= blockpos_max.X; ++blockpos.X) {
 150                 std::map<v3s16, MinimapMapblock *>::const_iterator pblock =
 151                         m_blocks_cache.find(blockpos);
 152                 if (pblock == m_blocks_cache.end())
 153                         continue;
 154                 const MinimapMapblock &block = *pblock->second;
 155
 156                 v3s16 block_node_min(blockpos * MAP_BLOCKSIZE);
 157                 v3s16 block_node_max(block_node_min + MAP_BLOCKSIZE - 1);
 158                 // clip
 159                 v3s16 range_min = componentwise_max(block_node_min, pos_min);
 160                 v3s16 range_max = componentwise_min(block_node_max, pos_max);
 161
 162                 v3s16 pos;
 163                 pos.Y = range_min.Y;
 164                 for (pos.Z = range_min.Z; pos.Z <= range_max.Z; ++pos.Z)
 165                 for (pos.X = range_min.X; pos.X <= range_max.X; ++pos.X) {
 166                         v3s16 inblock_pos = pos - block_node_min;
 167                         const MinimapPixel &in_pixel =
 168                                 block.data[inblock_pos.Z * MAP_BLOCKSIZE + inblock_pos.X];
 169
 170                         v3s16 inmap_pos = pos - pos_min;
 171                         MinimapPixel &out_pixel =
 172                                 data->minimap_scan[inmap_pos.X + inmap_pos.Z * size];
 173
 174                         out_pixel.air_count += in_pixel.air_count;
 175                         if (in_pixel.n.param0 != CONTENT_AIR) {
 176                                 out_pixel.n = in_pixel.n;
 177                                 out_pixel.height = inmap_pos.Y + in_pixel.height;
 178                         }
 179                 }
 180         }
 181 }
 182
 183 ////
 184 //// Mapper
 185 ////
 186
 187 Minimap::Minimap(IrrlichtDevice *device, Client *client)
 188 {
 189         this->client    = client;
 190         this->driver    = device->getVideoDriver();
 191         this->m_tsrc    = client->getTextureSource();
 192         this->m_shdrsrc = client->getShaderSource();
 193         this->m_ndef    = client->getNodeDefManager();
 194
 195         m_angle = 0.f;
 196
 197         // Initialize static settings
 198         m_enable_shaders = g_settings->getBool("enable_shaders");
 199         m_surface_mode_scan_height =
 200                 g_settings->getBool("minimap_double_scan_height") ? 256 : 128;
 201
 202         // Initialize minimap data
 203         data = new MinimapData;
 204         data->mode              = MINIMAP_MODE_OFF;
 205         data->is_radar          = false;
 206         data->map_invalidated   = true;
 207         data->texture           = NULL;
 208         data->heightmap_texture = NULL;
 209         data->minimap_shape_round = g_settings->getBool("minimap_shape_round");
 210
 211         // Get round minimap textures
 212         data->minimap_mask_round = driver->createImage(
 213                 m_tsrc->getTexture("minimap_mask_round.png"),
 214                 core::position2d<s32>(0, 0),
 215                 core::dimension2d<u32>(MINIMAP_MAX_SX, MINIMAP_MAX_SY));
 216         data->minimap_overlay_round = m_tsrc->getTexture("minimap_overlay_round.png");
 217
 218         // Get square minimap textures
 219         data->minimap_mask_square = driver->createImage(
 220                 m_tsrc->getTexture("minimap_mask_square.png"),
 221                 core::position2d<s32>(0, 0),
 222                 core::dimension2d<u32>(MINIMAP_MAX_SX, MINIMAP_MAX_SY));
 223         data->minimap_overlay_square = m_tsrc->getTexture("minimap_overlay_square.png");
 224
 225         // Create player marker texture
 226         data->player_marker = m_tsrc->getTexture("player_marker.png");
 227         // Create object marker texture
 228         data->object_marker_red = m_tsrc->getTexture("object_marker_red.png");
 229
 230         // Create mesh buffer for minimap
 231         m_meshbuffer = getMinimapMeshBuffer();
 232
 233         // Initialize and start thread
 234         m_minimap_update_thread = new MinimapUpdateThread();
 235         m_minimap_update_thread->data = data;
 236         m_minimap_update_thread->start();
 237 }
 238
 239 Minimap::~Minimap()
 240 {
 241         m_minimap_update_thread->stop();
 242         m_minimap_update_thread->wait();
 243
 244         m_meshbuffer->drop();
 245
 246         data->minimap_mask_round->drop();
 247         data->minimap_mask_square->drop();
 248
 249         driver->removeTexture(data->texture);
 250         driver->removeTexture(data->heightmap_texture);
 251         driver->removeTexture(data->minimap_overlay_round);
 252         driver->removeTexture(data->minimap_overlay_square);
 253         driver->removeTexture(data->object_marker_red);
 254
 255         delete data;
 256         delete m_minimap_update_thread;
 257 }
 258
 259 void Minimap::addBlock(v3s16 pos, MinimapMapblock *data)
 260 {
 261         m_minimap_update_thread->enqueueBlock(pos, data);
 262 }
 263
 264 void Minimap::toggleMinimapShape()
 265 {
 266         MutexAutoLock lock(m_mutex);
 267
 268         data->minimap_shape_round = !data->minimap_shape_round;
 269         g_settings->setBool("minimap_shape_round", data->minimap_shape_round);
 270         m_minimap_update_thread->deferUpdate();
 271 }
 272
 273 void Minimap::setMinimapShape(MinimapShape shape)
 274 {
 275         MutexAutoLock lock(m_mutex);
 276
 277         if (shape == MINIMAP_SHAPE_SQUARE)
 278                 data->minimap_shape_round = false;
 279         else if (shape == MINIMAP_SHAPE_ROUND)
 280                 data->minimap_shape_round = true;
 281
 282         g_settings->setBool("minimap_shape_round", data->minimap_shape_round);
 283         m_minimap_update_thread->deferUpdate();
 284 }
 285
 286 MinimapShape Minimap::getMinimapShape()
 287 {
 288         if (data->minimap_shape_round) {
 289                 return MINIMAP_SHAPE_ROUND;
 290         } else {
 291                 return MINIMAP_SHAPE_SQUARE;
 292         }
 293 }
 294
 295 void Minimap::setMinimapMode(MinimapMode mode)
 296 {
 297         static const MinimapModeDef modedefs[MINIMAP_MODE_COUNT] = {
 298                 {false, 0, 0},
 299                 {false, m_surface_mode_scan_height, 256},
 300                 {false, m_surface_mode_scan_height, 128},
 301                 {false, m_surface_mode_scan_height, 64},
 302                 {true, 32, 128},
 303                 {true, 32, 64},
 304                 {true, 32, 32}
 305         };
 306
 307         if (mode >= MINIMAP_MODE_COUNT)
 308                 return;
 309
 310         MutexAutoLock lock(m_mutex);
 311
 312         data->is_radar    = modedefs[mode].is_radar;
 313         data->scan_height = modedefs[mode].scan_height;
 314         data->map_size    = modedefs[mode].map_size;
 315         data->mode        = mode;
 316
 317         m_minimap_update_thread->deferUpdate();
 318 }
 319
 320 void Minimap::setPos(v3s16 pos)
 321 {
 322         bool do_update = false;
 323
 324         {
 325                 MutexAutoLock lock(m_mutex);
 326
 327                 if (pos != data->old_pos) {
 328                         data->old_pos = data->pos;
 329                         data->pos = pos;
 330                         do_update = true;
 331                 }
 332         }
 333
 334         if (do_update)
 335                 m_minimap_update_thread->deferUpdate();
 336 }
 337
 338 void Minimap::setAngle(f32 angle)
 339 {
 340         m_angle = angle;
 341 }
 342
 343 void Minimap::blitMinimapPixelsToImageRadar(video::IImage *map_image)
 344 {
 345         video::SColor c(240, 0, 0, 0);
 346         for (s16 x = 0; x < data->map_size; x++)
 347         for (s16 z = 0; z < data->map_size; z++) {
 348                 MinimapPixel *mmpixel = &data->minimap_scan[x + z * data->map_size];
 349
 350                 if (mmpixel->air_count > 0)
 351                         c.setGreen(core::clamp(core::round32(32 + mmpixel->air_count * 8), 0, 255));
 352                 else
 353                         c.setGreen(0);
 354
 355                 map_image->setPixel(x, data->map_size - z - 1, c);
 356         }
 357 }
 358
 359 void Minimap::blitMinimapPixelsToImageSurface(
 360         video::IImage *map_image, video::IImage *heightmap_image)
 361 {
 362         // This variable creation/destruction has a 1% cost on rendering minimap
 363         video::SColor tilecolor;
 364         for (s16 x = 0; x < data->map_size; x++)
 365         for (s16 z = 0; z < data->map_size; z++) {
 366                 MinimapPixel *mmpixel = &data->minimap_scan[x + z * data->map_size];
 367
 368                 const ContentFeatures &f = m_ndef->get(mmpixel->n);
 369                 const TileDef *tile = &f.tiledef[0];
 370
 371                 // Color of the 0th tile (mostly this is the topmost)
 372                 if(tile->has_color)
 373                         tilecolor = tile->color;
 374                 else
 375                         mmpixel->n.getColor(f, &tilecolor);
 376
 377                 tilecolor.setRed(tilecolor.getRed() * f.minimap_color.getRed() / 255);
 378                 tilecolor.setGreen(tilecolor.getGreen() * f.minimap_color.getGreen() / 255);
 379                 tilecolor.setBlue(tilecolor.getBlue() * 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 : data->minimap_mask_square;
 414
 415         if (minimap_mask) {
 416                 for (s16 y = 0; y < MINIMAP_MAX_SY; y++)
 417                 for (s16 x = 0; x < MINIMAP_MAX_SX; x++) {
 418                         const video::SColor &mask_col = minimap_mask->getPixel(x, y);
 419                         if (!mask_col.getAlpha())
 420                                 minimap_image->setPixel(x, y, video::SColor(0,0,0,0));
 421                 }
 422         }
 423
 424         if (data->texture)
 425                 driver->removeTexture(data->texture);
 426         if (data->heightmap_texture)
 427                 driver->removeTexture(data->heightmap_texture);
 428
 429         data->texture = driver->addTexture("minimap__", minimap_image);
 430         data->heightmap_texture =
 431                 driver->addTexture("minimap_heightmap__", heightmap_image);
 432         minimap_image->drop();
 433         heightmap_image->drop();
 434
 435         data->map_invalidated = true;
 436
 437         return data->texture;
 438 }
 439
 440 v3f Minimap::getYawVec()
 441 {
 442         if (data->minimap_shape_round) {
 443                 return v3f(
 444                         cos(m_angle * core::DEGTORAD),
 445                         sin(m_angle * core::DEGTORAD),
 446                         1.0);
 447         } else {
 448                 return v3f(1.0, 0.0, 1.0);
 449         }
 450 }
 451
 452 scene::SMeshBuffer *Minimap::getMinimapMeshBuffer()
 453 {
 454         scene::SMeshBuffer *buf = new scene::SMeshBuffer();
 455         buf->Vertices.set_used(4);
 456         buf->Indices.set_used(6);
 457         static const video::SColor c(255, 255, 255, 255);
 458
 459         buf->Vertices[0] = video::S3DVertex(-1, -1, 0, 0, 0, 1, c, 0, 1);
 460         buf->Vertices[1] = video::S3DVertex(-1,  1, 0, 0, 0, 1, c, 0, 0);
 461         buf->Vertices[2] = video::S3DVertex( 1,  1, 0, 0, 0, 1, c, 1, 0);
 462         buf->Vertices[3] = video::S3DVertex( 1, -1, 0, 0, 0, 1, c, 1, 1);
 463
 464         buf->Indices[0] = 0;
 465         buf->Indices[1] = 1;
 466         buf->Indices[2] = 2;
 467         buf->Indices[3] = 2;
 468         buf->Indices[4] = 3;
 469         buf->Indices[5] = 0;
 470
 471         return buf;
 472 }
 473
 474 void Minimap::drawMinimap()
 475 {
 476         video::ITexture *minimap_texture = getMinimapTexture();
 477         if (!minimap_texture)
 478                 return;
 479
 480         updateActiveMarkers();
 481         v2u32 screensize = porting::getWindowSize();
 482         const u32 size = 0.25 * screensize.Y;
 483
 484         core::rect<s32> oldViewPort = driver->getViewPort();
 485         core::matrix4 oldProjMat = driver->getTransform(video::ETS_PROJECTION);
 486         core::matrix4 oldViewMat = driver->getTransform(video::ETS_VIEW);
 487
 488         driver->setViewPort(core::rect<s32>(
 489                 screensize.X - size - 10, 10,
 490                 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 : data->minimap_overlay_square;
 521         material.TextureLayer[0].Texture = minimap_overlay;
 522         material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 523         driver->setMaterial(material);
 524         driver->drawMeshBuffer(m_meshbuffer);
 525
 526         // If round minimap, draw player marker
 527         if (!data->minimap_shape_round) {
 528                 matrix.setRotationDegrees(core::vector3df(0, 0, m_angle));
 529                 material.TextureLayer[0].Texture = data->player_marker;
 530
 531                 driver->setTransform(video::ETS_WORLD, matrix);
 532                 driver->setMaterial(material);
 533                 driver->drawMeshBuffer(m_meshbuffer);
 534         }
 535
 536         // Reset transformations
 537         driver->setTransform(video::ETS_VIEW, oldViewMat);
 538         driver->setTransform(video::ETS_PROJECTION, oldProjMat);
 539         driver->setViewPort(oldViewPort);
 540
 541         // Draw player markers
 542         v2s32 s_pos(screensize.X - size - 10, 10);
 543         core::dimension2di imgsize(data->object_marker_red->getOriginalSize());
 544         core::rect<s32> img_rect(0, 0, imgsize.Width, imgsize.Height);
 545         static const video::SColor col(255, 255, 255, 255);
 546         static const video::SColor c[4] = {col, col, col, col};
 547         f32 sin_angle = sin(m_angle * core::DEGTORAD);
 548         f32 cos_angle = cos(m_angle * core::DEGTORAD);
 549         s32 marker_size2 =  0.025 * (float)size;
 550         for (std::list<v2f>::const_iterator
 551                         i = m_active_markers.begin();
 552                         i != m_active_markers.end(); ++i) {
 553                 v2f posf = *i;
 554                 if (data->minimap_shape_round) {
 555                         f32 t1 = posf.X * cos_angle - posf.Y * sin_angle;
 556                         f32 t2 = posf.X * sin_angle + posf.Y * cos_angle;
 557                         posf.X = t1;
 558                         posf.Y = t2;
 559                 }
 560                 posf.X = (posf.X + 0.5) * (float)size;
 561                 posf.Y = (posf.Y + 0.5) * (float)size;
 562                 core::rect<s32> dest_rect(
 563                         s_pos.X + posf.X - marker_size2,
 564                         s_pos.Y + posf.Y - marker_size2,
 565                         s_pos.X + posf.X + marker_size2,
 566                         s_pos.Y + posf.Y + marker_size2);
 567                 driver->draw2DImage(data->object_marker_red, dest_rect,
 568                         img_rect, &dest_rect, &c[0], true);
 569         }
 570 }
 571
 572 void Minimap::updateActiveMarkers()
 573 {
 574         video::IImage *minimap_mask = data->minimap_shape_round ?
 575                 data->minimap_mask_round : data->minimap_mask_square;
 576
 577         const std::list<Nametag *> &nametags = client->getCamera()->getNametags();
 578
 579         m_active_markers.clear();
 580
 581         for (std::list<Nametag *>::const_iterator i = nametags.begin();
 582                         i != nametags.end(); ++i) {
 583                 v3s16 pos = floatToInt((*i)->parent_node->getPosition() +
 584                         intToFloat(client->getCamera()->getOffset(), BS), BS);
 585                 pos -= data->pos - v3s16(data->map_size / 2,
 586                                 data->scan_height / 2,
 587                                 data->map_size / 2);
 588                 if (pos.X < 0 || pos.X > data->map_size ||
 589                                 pos.Y < 0 || pos.Y > data->scan_height ||
 590                                 pos.Z < 0 || pos.Z > data->map_size) {
 591                         continue;
 592                 }
 593                 pos.X = ((float)pos.X / data->map_size) * MINIMAP_MAX_SX;
 594                 pos.Z = ((float)pos.Z / data->map_size) * MINIMAP_MAX_SY;
 595                 const video::SColor &mask_col = minimap_mask->getPixel(pos.X, pos.Z);
 596                 if (!mask_col.getAlpha()) {
 597                         continue;
 598                 }
 599                 m_active_markers.push_back(v2f(((float)pos.X / (float)MINIMAP_MAX_SX) - 0.5,
 600                         (1.0 - (float)pos.Z / (float)MINIMAP_MAX_SY) - 0.5));
 601         }
 602 }
 603
 604 ////
 605 //// MinimapMapblock
 606 ////
 607
 608 void MinimapMapblock::getMinimapNodes(VoxelManipulator *vmanip, v3s16 pos)
 609 {
 610
 611         for (s16 x = 0; x < MAP_BLOCKSIZE; x++)
 612         for (s16 z = 0; z < MAP_BLOCKSIZE; z++) {
 613                 s16 air_count = 0;
 614                 bool surface_found = false;
 615                 MinimapPixel *mmpixel = &data[z * MAP_BLOCKSIZE + x];
 616
 617                 for (s16 y = MAP_BLOCKSIZE -1; y >= 0; y--) {
 618                         v3s16 p(x, y, z);
 619                         MapNode n = vmanip->getNodeNoEx(pos + p);
 620                         if (!surface_found && n.getContent() != CONTENT_AIR) {
 621                                 mmpixel->height = y;
 622                                 mmpixel->n = n;
 623                                 surface_found = true;
 624                         } else if (n.getContent() == CONTENT_AIR) {
 625                                 air_count++;
 626                         }
 627                 }
 628
 629                 if (!surface_found)
 630                         mmpixel->n = MapNode(CONTENT_AIR);
 631
 632                 mmpixel->air_count = air_count;
 633         }
 634 }