src/clientmap.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 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 "clientmap.h"
  21 #include "client.h"
  22 #include "mapblock_mesh.h"
  23 #include <IMaterialRenderer.h>
  24 #include <matrix4.h>
  25 #include "mapsector.h"
  26 #include "mapblock.h"
  27 #include "profiler.h"
  28 #include "settings.h"
  29 #include "camera.h"               // CameraModes
  30 #include "util/basic_macros.h"
  31 #include <algorithm>
  32 #include "client/renderingengine.h"
  33
  34 ClientMap::ClientMap(
  35                 Client *client,
  36                 MapDrawControl &control,
  37                 s32 id
  38 ):
  39         Map(dout_client, client),
  40         scene::ISceneNode(RenderingEngine::get_scene_manager()->getRootSceneNode(),
  41                 RenderingEngine::get_scene_manager(), id),
  42         m_client(client),
  43         m_control(control)
  44 {
  45         m_box = aabb3f(-BS*1000000,-BS*1000000,-BS*1000000,
  46                         BS*1000000,BS*1000000,BS*1000000);
  47
  48         /* TODO: Add a callback function so these can be updated when a setting
  49          *       changes.  At this point in time it doesn't matter (e.g. /set
  50          *       is documented to change server settings only)
  51          *
  52          * TODO: Local caching of settings is not optimal and should at some stage
  53          *       be updated to use a global settings object for getting thse values
  54          *       (as opposed to the this local caching). This can be addressed in
  55          *       a later release.
  56          */
  57         m_cache_trilinear_filter  = g_settings->getBool("trilinear_filter");
  58         m_cache_bilinear_filter   = g_settings->getBool("bilinear_filter");
  59         m_cache_anistropic_filter = g_settings->getBool("anisotropic_filter");
  60
  61 }
  62
  63 MapSector * ClientMap::emergeSector(v2s16 p2d)
  64 {
  65         DSTACK(FUNCTION_NAME);
  66         // Check that it doesn't exist already
  67         try {
  68                 return getSectorNoGenerate(p2d);
  69         } catch(InvalidPositionException &e) {
  70         }
  71
  72         // Create a sector
  73         MapSector *sector = new MapSector(this, p2d, m_gamedef);
  74         m_sectors[p2d] = sector;
  75
  76         return sector;
  77 }
  78
  79 void ClientMap::OnRegisterSceneNode()
  80 {
  81         if(IsVisible)
  82         {
  83                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
  84                 SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
  85         }
  86
  87         ISceneNode::OnRegisterSceneNode();
  88 }
  89
  90 void ClientMap::getBlocksInViewRange(v3s16 cam_pos_nodes,
  91                 v3s16 *p_blocks_min, v3s16 *p_blocks_max)
  92 {
  93         v3s16 box_nodes_d = m_control.wanted_range * v3s16(1, 1, 1);
  94         // Define p_nodes_min/max as v3s32 because 'cam_pos_nodes -/+ box_nodes_d'
  95         // can exceed the range of v3s16 when a large view range is used near the
  96         // world edges.
  97         v3s32 p_nodes_min(
  98                 cam_pos_nodes.X - box_nodes_d.X,
  99                 cam_pos_nodes.Y - box_nodes_d.Y,
 100                 cam_pos_nodes.Z - box_nodes_d.Z);
 101         v3s32 p_nodes_max(
 102                 cam_pos_nodes.X + box_nodes_d.X,
 103                 cam_pos_nodes.Y + box_nodes_d.Y,
 104                 cam_pos_nodes.Z + box_nodes_d.Z);
 105         // Take a fair amount as we will be dropping more out later
 106         // Umm... these additions are a bit strange but they are needed.
 107         *p_blocks_min = v3s16(
 108                         p_nodes_min.X / MAP_BLOCKSIZE - 3,
 109                         p_nodes_min.Y / MAP_BLOCKSIZE - 3,
 110                         p_nodes_min.Z / MAP_BLOCKSIZE - 3);
 111         *p_blocks_max = v3s16(
 112                         p_nodes_max.X / MAP_BLOCKSIZE + 1,
 113                         p_nodes_max.Y / MAP_BLOCKSIZE + 1,
 114                         p_nodes_max.Z / MAP_BLOCKSIZE + 1);
 115 }
 116
 117 void ClientMap::updateDrawList()
 118 {
 119         ScopeProfiler sp(g_profiler, "CM::updateDrawList()", SPT_AVG);
 120         g_profiler->add("CM::updateDrawList() count", 1);
 121
 122         for (auto &i : m_drawlist) {
 123                 MapBlock *block = i.second;
 124                 block->refDrop();
 125         }
 126         m_drawlist.clear();
 127
 128         v3f camera_position = m_camera_position;
 129         v3f camera_direction = m_camera_direction;
 130         f32 camera_fov = m_camera_fov;
 131
 132         // Use a higher fov to accomodate faster camera movements.
 133         // Blocks are cropped better when they are drawn.
 134         // Or maybe they aren't? Well whatever.
 135         camera_fov *= 1.2;
 136
 137         v3s16 cam_pos_nodes = floatToInt(camera_position, BS);
 138         v3s16 p_blocks_min;
 139         v3s16 p_blocks_max;
 140         getBlocksInViewRange(cam_pos_nodes, &p_blocks_min, &p_blocks_max);
 141
 142         // Number of blocks in rendering range
 143         u32 blocks_in_range = 0;
 144         // Number of blocks occlusion culled
 145         u32 blocks_occlusion_culled = 0;
 146         // Number of blocks in rendering range but don't have a mesh
 147         u32 blocks_in_range_without_mesh = 0;
 148         // Blocks that had mesh that would have been drawn according to
 149         // rendering range (if max blocks limit didn't kick in)
 150         u32 blocks_would_have_drawn = 0;
 151         // Blocks that were drawn and had a mesh
 152         u32 blocks_drawn = 0;
 153         // Blocks which had a corresponding meshbuffer for this pass
 154         //u32 blocks_had_pass_meshbuf = 0;
 155         // Blocks from which stuff was actually drawn
 156         //u32 blocks_without_stuff = 0;
 157         // Distance to farthest drawn block
 158         float farthest_drawn = 0;
 159
 160         // No occlusion culling when free_move is on and camera is
 161         // inside ground
 162         bool occlusion_culling_enabled = true;
 163         if (g_settings->getBool("free_move")) {
 164                 MapNode n = getNodeNoEx(cam_pos_nodes);
 165                 if (n.getContent() == CONTENT_IGNORE ||
 166                                 m_nodedef->get(n).solidness == 2)
 167                         occlusion_culling_enabled = false;
 168         }
 169
 170         for (const auto &sector_it : m_sectors) {
 171                 MapSector *sector = sector_it.second;
 172                 v2s16 sp = sector->getPos();
 173
 174                 if (!m_control.range_all) {
 175                         if (sp.X < p_blocks_min.X || sp.X > p_blocks_max.X ||
 176                                         sp.Y < p_blocks_min.Z || sp.Y > p_blocks_max.Z)
 177                                 continue;
 178                 }
 179
 180                 MapBlockVect sectorblocks;
 181                 sector->getBlocks(sectorblocks);
 182
 183                 /*
 184                         Loop through blocks in sector
 185                 */
 186
 187                 u32 sector_blocks_drawn = 0;
 188
 189                 for (auto block : sectorblocks) {
 190                         /*
 191                         Compare block position to camera position, skip
 192                         if not seen on display
 193                 */
 194
 195                         if (block->mesh)
 196                                 block->mesh->updateCameraOffset(m_camera_offset);
 197
 198                         float range = 100000 * BS;
 199                         if (!m_control.range_all)
 200                                 range = m_control.wanted_range * BS;
 201
 202                         float d = 0.0;
 203                         if (!isBlockInSight(block->getPos(), camera_position,
 204                                         camera_direction, camera_fov, range, &d))
 205                                 continue;
 206
 207                         blocks_in_range++;
 208
 209                         /*
 210                                 Ignore if mesh doesn't exist
 211                         */
 212                         if (!block->mesh) {
 213                                 blocks_in_range_without_mesh++;
 214                                 continue;
 215                         }
 216
 217                         /*
 218                                 Occlusion culling
 219                         */
 220                         if (occlusion_culling_enabled && isBlockOccluded(block, cam_pos_nodes)) {
 221                                 blocks_occlusion_culled++;
 222                                 continue;
 223                         }
 224
 225                         // This block is in range. Reset usage timer.
 226                         block->resetUsageTimer();
 227
 228                         // Limit block count in case of a sudden increase
 229                         blocks_would_have_drawn++;
 230                         if (blocks_drawn >= m_control.wanted_max_blocks &&
 231                                         !m_control.range_all &&
 232                                         d > m_control.wanted_range * BS)
 233                                 continue;
 234
 235                         // Add to set
 236                         block->refGrab();
 237                         m_drawlist[block->getPos()] = block;
 238
 239                         sector_blocks_drawn++;
 240                         blocks_drawn++;
 241                         if (d / BS > farthest_drawn)
 242                                 farthest_drawn = d / BS;
 243
 244                 } // foreach sectorblocks
 245
 246                 if (sector_blocks_drawn != 0)
 247                         m_last_drawn_sectors.insert(sp);
 248         }
 249
 250         g_profiler->avg("CM: blocks in range", blocks_in_range);
 251         g_profiler->avg("CM: blocks occlusion culled", blocks_occlusion_culled);
 252         if (blocks_in_range != 0)
 253                 g_profiler->avg("CM: blocks in range without mesh (frac)",
 254                                 (float)blocks_in_range_without_mesh / blocks_in_range);
 255         g_profiler->avg("CM: blocks drawn", blocks_drawn);
 256         g_profiler->avg("CM: farthest drawn", farthest_drawn);
 257         g_profiler->avg("CM: wanted max blocks", m_control.wanted_max_blocks);
 258 }
 259
 260 struct MeshBufList
 261 {
 262         video::SMaterial m;
 263         std::vector<scene::IMeshBuffer*> bufs;
 264 };
 265
 266 struct MeshBufListList
 267 {
 268         /*!
 269          * Stores the mesh buffers of the world.
 270          * The array index is the material's layer.
 271          * The vector part groups vertices by material.
 272          */
 273         std::vector<MeshBufList> lists[MAX_TILE_LAYERS];
 274
 275         void clear()
 276         {
 277                 for (auto &list : lists)
 278                         list.clear();
 279         }
 280
 281         void add(scene::IMeshBuffer *buf, u8 layer)
 282         {
 283                 // Append to the correct layer
 284                 std::vector<MeshBufList> &list = lists[layer];
 285                 const video::SMaterial &m = buf->getMaterial();
 286                 for (MeshBufList &l : list) {
 287                         // comparing a full material is quite expensive so we don't do it if
 288                         // not even first texture is equal
 289                         if (l.m.TextureLayer[0].Texture != m.TextureLayer[0].Texture)
 290                                 continue;
 291
 292                         if (l.m == m) {
 293                                 l.bufs.push_back(buf);
 294                                 return;
 295                         }
 296                 }
 297                 MeshBufList l;
 298                 l.m = m;
 299                 l.bufs.push_back(buf);
 300                 list.push_back(l);
 301         }
 302 };
 303
 304 void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
 305 {
 306         DSTACK(FUNCTION_NAME);
 307
 308         bool is_transparent_pass = pass == scene::ESNRP_TRANSPARENT;
 309
 310         std::string prefix;
 311         if (pass == scene::ESNRP_SOLID)
 312                 prefix = "CM: solid: ";
 313         else
 314                 prefix = "CM: transparent: ";
 315
 316         /*
 317                 This is called two times per frame, reset on the non-transparent one
 318         */
 319         if (pass == scene::ESNRP_SOLID)
 320                 m_last_drawn_sectors.clear();
 321
 322         /*
 323                 Get time for measuring timeout.
 324
 325                 Measuring time is very useful for long delays when the
 326                 machine is swapping a lot.
 327         */
 328         std::time_t time1 = time(0);
 329
 330         /*
 331                 Get animation parameters
 332         */
 333         float animation_time = m_client->getAnimationTime();
 334         int crack = m_client->getCrackLevel();
 335         u32 daynight_ratio = m_client->getEnv().getDayNightRatio();
 336
 337         v3f camera_position = m_camera_position;
 338         v3f camera_direction = m_camera_direction;
 339         f32 camera_fov = m_camera_fov;
 340
 341         /*
 342                 Get all blocks and draw all visible ones
 343         */
 344
 345         u32 vertex_count = 0;
 346         u32 meshbuffer_count = 0;
 347
 348         // For limiting number of mesh animations per frame
 349         u32 mesh_animate_count = 0;
 350         u32 mesh_animate_count_far = 0;
 351
 352         // Blocks that were drawn and had a mesh
 353         u32 blocks_drawn = 0;
 354         // Blocks which had a corresponding meshbuffer for this pass
 355         u32 blocks_had_pass_meshbuf = 0;
 356         // Blocks from which stuff was actually drawn
 357         u32 blocks_without_stuff = 0;
 358
 359         /*
 360                 Draw the selected MapBlocks
 361         */
 362
 363         {
 364         ScopeProfiler sp(g_profiler, prefix + "drawing blocks", SPT_AVG);
 365
 366         MeshBufListList drawbufs;
 367
 368         for (auto &i : m_drawlist) {
 369                 MapBlock *block = i.second;
 370
 371                 // If the mesh of the block happened to get deleted, ignore it
 372                 if (!block->mesh)
 373                         continue;
 374
 375                 float d = 0.0;
 376                 if (!isBlockInSight(block->getPos(), camera_position,
 377                                 camera_direction, camera_fov, 100000 * BS, &d))
 378                         continue;
 379
 380                 // Mesh animation
 381                 if (pass == scene::ESNRP_SOLID) {
 382                         //MutexAutoLock lock(block->mesh_mutex);
 383                         MapBlockMesh *mapBlockMesh = block->mesh;
 384                         assert(mapBlockMesh);
 385                         // Pretty random but this should work somewhat nicely
 386                         bool faraway = d >= BS * 50;
 387                         //bool faraway = d >= m_control.wanted_range * BS;
 388                         if (mapBlockMesh->isAnimationForced() || !faraway ||
 389                                         mesh_animate_count_far < (m_control.range_all ? 200 : 50)) {
 390                                 bool animated = mapBlockMesh->animate(faraway, animation_time,
 391                                         crack, daynight_ratio);
 392                                 if (animated)
 393                                         mesh_animate_count++;
 394                                 if (animated && faraway)
 395                                         mesh_animate_count_far++;
 396                         } else {
 397                                 mapBlockMesh->decreaseAnimationForceTimer();
 398                         }
 399                 }
 400
 401                 /*
 402                         Get the meshbuffers of the block
 403                 */
 404                 {
 405                         //MutexAutoLock lock(block->mesh_mutex);
 406
 407                         MapBlockMesh *mapBlockMesh = block->mesh;
 408                         assert(mapBlockMesh);
 409
 410                         for (int layer = 0; layer < MAX_TILE_LAYERS; layer++) {
 411                                 scene::IMesh *mesh = mapBlockMesh->getMesh(layer);
 412                                 assert(mesh);
 413
 414                                 u32 c = mesh->getMeshBufferCount();
 415                                 for (u32 i = 0; i < c; i++) {
 416                                         scene::IMeshBuffer *buf = mesh->getMeshBuffer(i);
 417
 418                                         video::SMaterial& material = buf->getMaterial();
 419                                         video::IMaterialRenderer* rnd =
 420                                                 driver->getMaterialRenderer(material.MaterialType);
 421                                         bool transparent = (rnd && rnd->isTransparent());
 422                                         if (transparent == is_transparent_pass) {
 423                                                 if (buf->getVertexCount() == 0)
 424                                                         errorstream << "Block [" << analyze_block(block)
 425                                                                 << "] contains an empty meshbuf" << std::endl;
 426
 427                                                 material.setFlag(video::EMF_TRILINEAR_FILTER,
 428                                                         m_cache_trilinear_filter);
 429                                                 material.setFlag(video::EMF_BILINEAR_FILTER,
 430                                                         m_cache_bilinear_filter);
 431                                                 material.setFlag(video::EMF_ANISOTROPIC_FILTER,
 432                                                         m_cache_anistropic_filter);
 433                                                 material.setFlag(video::EMF_WIREFRAME,
 434                                                         m_control.show_wireframe);
 435
 436                                                 drawbufs.add(buf, layer);
 437                                         }
 438                                 }
 439                         }
 440                 }
 441         }
 442
 443         // Render all layers in order
 444         for (auto &lists : drawbufs.lists) {
 445                 int timecheck_counter = 0;
 446                 for (MeshBufList &list : lists) {
 447                         timecheck_counter++;
 448                         if (timecheck_counter > 50) {
 449                                 timecheck_counter = 0;
 450                                 std::time_t time2 = time(0);
 451                                 if (time2 > time1 + 4) {
 452                                         infostream << "ClientMap::renderMap(): "
 453                                                 "Rendering takes ages, returning."
 454                                                 << std::endl;
 455                                         return;
 456                                 }
 457                         }
 458
 459                         driver->setMaterial(list.m);
 460
 461                         for (scene::IMeshBuffer *buf : list.bufs) {
 462                                 driver->drawMeshBuffer(buf);
 463                                 vertex_count += buf->getVertexCount();
 464                                 meshbuffer_count++;
 465                         }
 466                 }
 467         }
 468         } // ScopeProfiler
 469
 470         // Log only on solid pass because values are the same
 471         if (pass == scene::ESNRP_SOLID) {
 472                 g_profiler->avg("CM: animated meshes", mesh_animate_count);
 473                 g_profiler->avg("CM: animated meshes (far)", mesh_animate_count_far);
 474         }
 475
 476         g_profiler->avg(prefix + "vertices drawn", vertex_count);
 477         if (blocks_had_pass_meshbuf != 0)
 478                 g_profiler->avg(prefix + "meshbuffers per block",
 479                         (float)meshbuffer_count / (float)blocks_had_pass_meshbuf);
 480         if (blocks_drawn != 0)
 481                 g_profiler->avg(prefix + "empty blocks (frac)",
 482                         (float)blocks_without_stuff / blocks_drawn);
 483 }
 484
 485 static bool getVisibleBrightness(Map *map, const v3f &p0, v3f dir, float step,
 486                 float step_multiplier, float start_distance, float end_distance,
 487                 INodeDefManager *ndef, u32 daylight_factor, float sunlight_min_d,
 488                 int *result, bool *sunlight_seen)
 489 {
 490         int brightness_sum = 0;
 491         int brightness_count = 0;
 492         float distance = start_distance;
 493         dir.normalize();
 494         v3f pf = p0;
 495         pf += dir * distance;
 496         int noncount = 0;
 497         bool nonlight_seen = false;
 498         bool allow_allowing_non_sunlight_propagates = false;
 499         bool allow_non_sunlight_propagates = false;
 500         // Check content nearly at camera position
 501         {
 502                 v3s16 p = floatToInt(p0 /*+ dir * 3*BS*/, BS);
 503                 MapNode n = map->getNodeNoEx(p);
 504                 if(ndef->get(n).param_type == CPT_LIGHT &&
 505                                 !ndef->get(n).sunlight_propagates)
 506                         allow_allowing_non_sunlight_propagates = true;
 507         }
 508         // If would start at CONTENT_IGNORE, start closer
 509         {
 510                 v3s16 p = floatToInt(pf, BS);
 511                 MapNode n = map->getNodeNoEx(p);
 512                 if(n.getContent() == CONTENT_IGNORE){
 513                         float newd = 2*BS;
 514                         pf = p0 + dir * 2*newd;
 515                         distance = newd;
 516                         sunlight_min_d = 0;
 517                 }
 518         }
 519         for (int i=0; distance < end_distance; i++) {
 520                 pf += dir * step;
 521                 distance += step;
 522                 step *= step_multiplier;
 523
 524                 v3s16 p = floatToInt(pf, BS);
 525                 MapNode n = map->getNodeNoEx(p);
 526                 if (allow_allowing_non_sunlight_propagates && i == 0 &&
 527                                 ndef->get(n).param_type == CPT_LIGHT &&
 528                                 !ndef->get(n).sunlight_propagates) {
 529                         allow_non_sunlight_propagates = true;
 530                 }
 531
 532                 if (ndef->get(n).param_type != CPT_LIGHT ||
 533                                 (!ndef->get(n).sunlight_propagates &&
 534                                         !allow_non_sunlight_propagates)){
 535                         nonlight_seen = true;
 536                         noncount++;
 537                         if(noncount >= 4)
 538                                 break;
 539                         continue;
 540                 }
 541
 542                 if (distance >= sunlight_min_d && !*sunlight_seen && !nonlight_seen)
 543                         if (n.getLight(LIGHTBANK_DAY, ndef) == LIGHT_SUN)
 544                                 *sunlight_seen = true;
 545                 noncount = 0;
 546                 brightness_sum += decode_light(n.getLightBlend(daylight_factor, ndef));
 547                 brightness_count++;
 548         }
 549         *result = 0;
 550         if(brightness_count == 0)
 551                 return false;
 552         *result = brightness_sum / brightness_count;
 553         /*std::cerr<<"Sampled "<<brightness_count<<" points; result="
 554                         <<(*result)<<std::endl;*/
 555         return true;
 556 }
 557
 558 int ClientMap::getBackgroundBrightness(float max_d, u32 daylight_factor,
 559                 int oldvalue, bool *sunlight_seen_result)
 560 {
 561         static v3f z_directions[50] = {
 562                 v3f(-100, 0, 0)
 563         };
 564         static f32 z_offsets[sizeof(z_directions)/sizeof(*z_directions)] = {
 565                 -1000,
 566         };
 567
 568         if(z_directions[0].X < -99){
 569                 for(u32 i=0; i<sizeof(z_directions)/sizeof(*z_directions); i++){
 570                         // Assumes FOV of 72 and 16/9 aspect ratio
 571                         z_directions[i] = v3f(
 572                                 0.02 * myrand_range(-100, 100),
 573                                 1.0,
 574                                 0.01 * myrand_range(-100, 100)
 575                         ).normalize();
 576                         z_offsets[i] = 0.01 * myrand_range(0,100);
 577                 }
 578         }
 579
 580         int sunlight_seen_count = 0;
 581         float sunlight_min_d = max_d*0.8;
 582         if(sunlight_min_d > 35*BS)
 583                 sunlight_min_d = 35*BS;
 584         std::vector<int> values;
 585         for(u32 i=0; i<sizeof(z_directions)/sizeof(*z_directions); i++){
 586                 v3f z_dir = z_directions[i];
 587                 core::CMatrix4<f32> a;
 588                 a.buildRotateFromTo(v3f(0,1,0), z_dir);
 589                 v3f dir = m_camera_direction;
 590                 a.rotateVect(dir);
 591                 int br = 0;
 592                 float step = BS*1.5;
 593                 if(max_d > 35*BS)
 594                         step = max_d / 35 * 1.5;
 595                 float off = step * z_offsets[i];
 596                 bool sunlight_seen_now = false;
 597                 bool ok = getVisibleBrightness(this, m_camera_position, dir,
 598                                 step, 1.0, max_d*0.6+off, max_d, m_nodedef, daylight_factor,
 599                                 sunlight_min_d,
 600                                 &br, &sunlight_seen_now);
 601                 if(sunlight_seen_now)
 602                         sunlight_seen_count++;
 603                 if(!ok)
 604                         continue;
 605                 values.push_back(br);
 606                 // Don't try too much if being in the sun is clear
 607                 if(sunlight_seen_count >= 20)
 608                         break;
 609         }
 610         int brightness_sum = 0;
 611         int brightness_count = 0;
 612         std::sort(values.begin(), values.end());
 613         u32 num_values_to_use = values.size();
 614         if(num_values_to_use >= 10)
 615                 num_values_to_use -= num_values_to_use/2;
 616         else if(num_values_to_use >= 7)
 617                 num_values_to_use -= num_values_to_use/3;
 618         u32 first_value_i = (values.size() - num_values_to_use) / 2;
 619
 620         for (u32 i=first_value_i; i < first_value_i + num_values_to_use; i++) {
 621                 brightness_sum += values[i];
 622                 brightness_count++;
 623         }
 624
 625         int ret = 0;
 626         if(brightness_count == 0){
 627                 MapNode n = getNodeNoEx(floatToInt(m_camera_position, BS));
 628                 if(m_nodedef->get(n).param_type == CPT_LIGHT){
 629                         ret = decode_light(n.getLightBlend(daylight_factor, m_nodedef));
 630                 } else {
 631                         ret = oldvalue;
 632                 }
 633         } else {
 634                 ret = brightness_sum / brightness_count;
 635         }
 636
 637         *sunlight_seen_result = (sunlight_seen_count > 0);
 638         return ret;
 639 }
 640
 641 void ClientMap::renderPostFx(CameraMode cam_mode)
 642 {
 643         // Sadly ISceneManager has no "post effects" render pass, in that case we
 644         // could just register for that and handle it in renderMap().
 645
 646         MapNode n = getNodeNoEx(floatToInt(m_camera_position, BS));
 647
 648         // - If the player is in a solid node, make everything black.
 649         // - If the player is in liquid, draw a semi-transparent overlay.
 650         // - Do not if player is in third person mode
 651         const ContentFeatures& features = m_nodedef->get(n);
 652         video::SColor post_effect_color = features.post_effect_color;
 653         if(features.solidness == 2 && !(g_settings->getBool("noclip") &&
 654                         m_client->checkLocalPrivilege("noclip")) &&
 655                         cam_mode == CAMERA_MODE_FIRST)
 656         {
 657                 post_effect_color = video::SColor(255, 0, 0, 0);
 658         }
 659         if (post_effect_color.getAlpha() != 0)
 660         {
 661                 // Draw a full-screen rectangle
 662                 video::IVideoDriver* driver = SceneManager->getVideoDriver();
 663                 v2u32 ss = driver->getScreenSize();
 664                 core::rect<s32> rect(0,0, ss.X, ss.Y);
 665                 driver->draw2DRectangle(post_effect_color, rect);
 666         }
 667 }
 668
 669 void ClientMap::PrintInfo(std::ostream &out)
 670 {
 671         out<<"ClientMap: ";
 672 }
 673
 674