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 "log.h"
  26 #include "mapsector.h"
  27 #include "nodedef.h"
  28 #include "mapblock.h"
  29 #include "profiler.h"
  30 #include "settings.h"
  31 #include "camera.h"               // CameraModes
  32 #include "util/mathconstants.h"
  33 #include <algorithm>
  34
  35 #define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
  36
  37 ClientMap::ClientMap(
  38                 Client *client,
  39                 IGameDef *gamedef,
  40                 MapDrawControl &control,
  41                 scene::ISceneNode* parent,
  42                 scene::ISceneManager* mgr,
  43                 s32 id
  44 ):
  45         Map(dout_client, gamedef),
  46         scene::ISceneNode(parent, mgr, id),
  47         m_client(client),
  48         m_control(control),
  49         m_camera_position(0,0,0),
  50         m_camera_direction(0,0,1),
  51         m_camera_fov(M_PI)
  52 {
  53         m_box = aabb3f(-BS*1000000,-BS*1000000,-BS*1000000,
  54                         BS*1000000,BS*1000000,BS*1000000);
  55
  56         /* TODO: Add a callback function so these can be updated when a setting
  57          *       changes.  At this point in time it doesn't matter (e.g. /set
  58          *       is documented to change server settings only)
  59          *
  60          * TODO: Local caching of settings is not optimal and should at some stage
  61          *       be updated to use a global settings object for getting thse values
  62          *       (as opposed to the this local caching). This can be addressed in
  63          *       a later release.
  64          */
  65         m_cache_trilinear_filter  = g_settings->getBool("trilinear_filter");
  66         m_cache_bilinear_filter   = g_settings->getBool("bilinear_filter");
  67         m_cache_anistropic_filter = g_settings->getBool("anisotropic_filter");
  68
  69 }
  70
  71 ClientMap::~ClientMap()
  72 {
  73         /*MutexAutoLock lock(mesh_mutex);
  74
  75         if(mesh != NULL)
  76         {
  77                 mesh->drop();
  78                 mesh = NULL;
  79         }*/
  80 }
  81
  82 MapSector * ClientMap::emergeSector(v2s16 p2d)
  83 {
  84         DSTACK(FUNCTION_NAME);
  85         // Check that it doesn't exist already
  86         try{
  87                 return getSectorNoGenerate(p2d);
  88         }
  89         catch(InvalidPositionException &e)
  90         {
  91         }
  92
  93         // Create a sector
  94         ClientMapSector *sector = new ClientMapSector(this, p2d, m_gamedef);
  95
  96         {
  97                 //MutexAutoLock lock(m_sector_mutex); // Bulk comment-out
  98                 m_sectors[p2d] = sector;
  99         }
 100
 101         return sector;
 102 }
 103
 104 void ClientMap::OnRegisterSceneNode()
 105 {
 106         if(IsVisible)
 107         {
 108                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
 109                 SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
 110         }
 111
 112         ISceneNode::OnRegisterSceneNode();
 113 }
 114
 115 static bool isOccluded(Map *map, v3s16 p0, v3s16 p1, float step, float stepfac,
 116                 float start_off, float end_off, u32 needed_count, INodeDefManager *nodemgr)
 117 {
 118         float d0 = (float)BS * p0.getDistanceFrom(p1);
 119         v3s16 u0 = p1 - p0;
 120         v3f uf = v3f(u0.X, u0.Y, u0.Z) * BS;
 121         uf.normalize();
 122         v3f p0f = v3f(p0.X, p0.Y, p0.Z) * BS;
 123         u32 count = 0;
 124         for(float s=start_off; s<d0+end_off; s+=step){
 125                 v3f pf = p0f + uf * s;
 126                 v3s16 p = floatToInt(pf, BS);
 127                 MapNode n = map->getNodeNoEx(p);
 128                 bool is_transparent = false;
 129                 const ContentFeatures &f = nodemgr->get(n);
 130                 if(f.solidness == 0)
 131                         is_transparent = (f.visual_solidness != 2);
 132                 else
 133                         is_transparent = (f.solidness != 2);
 134                 if(!is_transparent){
 135                         if(count == needed_count)
 136                                 return true;
 137                         count++;
 138                 }
 139                 step *= stepfac;
 140         }
 141         return false;
 142 }
 143
 144 void ClientMap::updateDrawList(video::IVideoDriver* driver)
 145 {
 146         ScopeProfiler sp(g_profiler, "CM::updateDrawList()", SPT_AVG);
 147         g_profiler->add("CM::updateDrawList() count", 1);
 148
 149         INodeDefManager *nodemgr = m_gamedef->ndef();
 150
 151         for(std::map<v3s16, MapBlock*>::iterator
 152                         i = m_drawlist.begin();
 153                         i != m_drawlist.end(); ++i)
 154         {
 155                 MapBlock *block = i->second;
 156                 block->refDrop();
 157         }
 158         m_drawlist.clear();
 159
 160         v3f camera_position = m_camera_position;
 161         v3f camera_direction = m_camera_direction;
 162         f32 camera_fov = m_camera_fov;
 163
 164         // Use a higher fov to accomodate faster camera movements.
 165         // Blocks are cropped better when they are drawn.
 166         // Or maybe they aren't? Well whatever.
 167         camera_fov *= 1.2;
 168
 169         v3s16 cam_pos_nodes = floatToInt(camera_position, BS);
 170         v3s16 box_nodes_d = m_control.wanted_range * v3s16(1,1,1);
 171         v3s16 p_nodes_min = cam_pos_nodes - box_nodes_d;
 172         v3s16 p_nodes_max = cam_pos_nodes + box_nodes_d;
 173         // Take a fair amount as we will be dropping more out later
 174         // Umm... these additions are a bit strange but they are needed.
 175         v3s16 p_blocks_min(
 176                         p_nodes_min.X / MAP_BLOCKSIZE - 3,
 177                         p_nodes_min.Y / MAP_BLOCKSIZE - 3,
 178                         p_nodes_min.Z / MAP_BLOCKSIZE - 3);
 179         v3s16 p_blocks_max(
 180                         p_nodes_max.X / MAP_BLOCKSIZE + 1,
 181                         p_nodes_max.Y / MAP_BLOCKSIZE + 1,
 182                         p_nodes_max.Z / MAP_BLOCKSIZE + 1);
 183
 184         // Number of blocks in rendering range
 185         u32 blocks_in_range = 0;
 186         // Number of blocks occlusion culled
 187         u32 blocks_occlusion_culled = 0;
 188         // Number of blocks in rendering range but don't have a mesh
 189         u32 blocks_in_range_without_mesh = 0;
 190         // Blocks that had mesh that would have been drawn according to
 191         // rendering range (if max blocks limit didn't kick in)
 192         u32 blocks_would_have_drawn = 0;
 193         // Blocks that were drawn and had a mesh
 194         u32 blocks_drawn = 0;
 195         // Blocks which had a corresponding meshbuffer for this pass
 196         //u32 blocks_had_pass_meshbuf = 0;
 197         // Blocks from which stuff was actually drawn
 198         //u32 blocks_without_stuff = 0;
 199         // Distance to farthest drawn block
 200         float farthest_drawn = 0;
 201
 202         for(std::map<v2s16, MapSector*>::iterator
 203                         si = m_sectors.begin();
 204                         si != m_sectors.end(); ++si)
 205         {
 206                 MapSector *sector = si->second;
 207                 v2s16 sp = sector->getPos();
 208
 209                 if(m_control.range_all == false)
 210                 {
 211                         if(sp.X < p_blocks_min.X
 212                         || sp.X > p_blocks_max.X
 213                         || sp.Y < p_blocks_min.Z
 214                         || sp.Y > p_blocks_max.Z)
 215                                 continue;
 216                 }
 217
 218                 MapBlockVect sectorblocks;
 219                 sector->getBlocks(sectorblocks);
 220
 221                 /*
 222                         Loop through blocks in sector
 223                 */
 224
 225                 u32 sector_blocks_drawn = 0;
 226
 227                 for(MapBlockVect::iterator i = sectorblocks.begin();
 228                                 i != sectorblocks.end(); ++i)
 229                 {
 230                         MapBlock *block = *i;
 231
 232                         /*
 233                                 Compare block position to camera position, skip
 234                                 if not seen on display
 235                         */
 236
 237                         if (block->mesh != NULL)
 238                                 block->mesh->updateCameraOffset(m_camera_offset);
 239
 240                         float range = 100000 * BS;
 241                         if(m_control.range_all == false)
 242                                 range = m_control.wanted_range * BS;
 243
 244                         float d = 0.0;
 245                         if(isBlockInSight(block->getPos(), camera_position,
 246                                         camera_direction, camera_fov,
 247                                         range, &d) == false)
 248                         {
 249                                 continue;
 250                         }
 251
 252                         // This is ugly (spherical distance limit?)
 253                         /*if(m_control.range_all == false &&
 254                                         d - 0.5*BS*MAP_BLOCKSIZE > range)
 255                                 continue;*/
 256
 257                         blocks_in_range++;
 258
 259                         /*
 260                                 Ignore if mesh doesn't exist
 261                         */
 262                         {
 263                                 //MutexAutoLock lock(block->mesh_mutex);
 264
 265                                 if(block->mesh == NULL){
 266                                         blocks_in_range_without_mesh++;
 267                                         continue;
 268                                 }
 269                         }
 270
 271                         /*
 272                                 Occlusion culling
 273                         */
 274
 275                         // No occlusion culling when free_move is on and camera is
 276                         // inside ground
 277                         bool occlusion_culling_enabled = true;
 278                         if(g_settings->getBool("free_move")){
 279                                 MapNode n = getNodeNoEx(cam_pos_nodes);
 280                                 if(n.getContent() == CONTENT_IGNORE ||
 281                                                 nodemgr->get(n).solidness == 2)
 282                                         occlusion_culling_enabled = false;
 283                         }
 284
 285                         v3s16 cpn = block->getPos() * MAP_BLOCKSIZE;
 286                         cpn += v3s16(MAP_BLOCKSIZE/2, MAP_BLOCKSIZE/2, MAP_BLOCKSIZE/2);
 287                         float step = BS*1;
 288                         float stepfac = 1.1;
 289                         float startoff = BS*1;
 290                         float endoff = -BS*MAP_BLOCKSIZE*1.42*1.42;
 291                         v3s16 spn = cam_pos_nodes + v3s16(0,0,0);
 292                         s16 bs2 = MAP_BLOCKSIZE/2 + 1;
 293                         u32 needed_count = 1;
 294                         if(
 295                                 occlusion_culling_enabled &&
 296                                 isOccluded(this, spn, cpn + v3s16(0,0,0),
 297                                         step, stepfac, startoff, endoff, needed_count, nodemgr) &&
 298                                 isOccluded(this, spn, cpn + v3s16(bs2,bs2,bs2),
 299                                         step, stepfac, startoff, endoff, needed_count, nodemgr) &&
 300                                 isOccluded(this, spn, cpn + v3s16(bs2,bs2,-bs2),
 301                                         step, stepfac, startoff, endoff, needed_count, nodemgr) &&
 302                                 isOccluded(this, spn, cpn + v3s16(bs2,-bs2,bs2),
 303                                         step, stepfac, startoff, endoff, needed_count, nodemgr) &&
 304                                 isOccluded(this, spn, cpn + v3s16(bs2,-bs2,-bs2),
 305                                         step, stepfac, startoff, endoff, needed_count, nodemgr) &&
 306                                 isOccluded(this, spn, cpn + v3s16(-bs2,bs2,bs2),
 307                                         step, stepfac, startoff, endoff, needed_count, nodemgr) &&
 308                                 isOccluded(this, spn, cpn + v3s16(-bs2,bs2,-bs2),
 309                                         step, stepfac, startoff, endoff, needed_count, nodemgr) &&
 310                                 isOccluded(this, spn, cpn + v3s16(-bs2,-bs2,bs2),
 311                                         step, stepfac, startoff, endoff, needed_count, nodemgr) &&
 312                                 isOccluded(this, spn, cpn + v3s16(-bs2,-bs2,-bs2),
 313                                         step, stepfac, startoff, endoff, needed_count, nodemgr)
 314                         )
 315                         {
 316                                 blocks_occlusion_culled++;
 317                                 continue;
 318                         }
 319
 320                         // This block is in range. Reset usage timer.
 321                         block->resetUsageTimer();
 322
 323                         // Limit block count in case of a sudden increase
 324                         blocks_would_have_drawn++;
 325                         if(blocks_drawn >= m_control.wanted_max_blocks
 326                                         && m_control.range_all == false
 327                                         && d > m_control.wanted_min_range * BS)
 328                                 continue;
 329
 330                         // Add to set
 331                         block->refGrab();
 332                         m_drawlist[block->getPos()] = block;
 333
 334                         sector_blocks_drawn++;
 335                         blocks_drawn++;
 336                         if(d/BS > farthest_drawn)
 337                                 farthest_drawn = d/BS;
 338
 339                 } // foreach sectorblocks
 340
 341                 if(sector_blocks_drawn != 0)
 342                         m_last_drawn_sectors.insert(sp);
 343         }
 344
 345         m_control.blocks_would_have_drawn = blocks_would_have_drawn;
 346         m_control.blocks_drawn = blocks_drawn;
 347         m_control.farthest_drawn = farthest_drawn;
 348
 349         g_profiler->avg("CM: blocks in range", blocks_in_range);
 350         g_profiler->avg("CM: blocks occlusion culled", blocks_occlusion_culled);
 351         if(blocks_in_range != 0)
 352                 g_profiler->avg("CM: blocks in range without mesh (frac)",
 353                                 (float)blocks_in_range_without_mesh/blocks_in_range);
 354         g_profiler->avg("CM: blocks drawn", blocks_drawn);
 355         g_profiler->avg("CM: farthest drawn", farthest_drawn);
 356         g_profiler->avg("CM: wanted max blocks", m_control.wanted_max_blocks);
 357 }
 358
 359 struct MeshBufList
 360 {
 361         video::SMaterial m;
 362         std::vector<scene::IMeshBuffer*> bufs;
 363 };
 364
 365 struct MeshBufListList
 366 {
 367         std::vector<MeshBufList> lists;
 368
 369         void clear()
 370         {
 371                 lists.clear();
 372         }
 373
 374         void add(scene::IMeshBuffer *buf)
 375         {
 376                 for(std::vector<MeshBufList>::iterator i = lists.begin();
 377                                 i != lists.end(); ++i){
 378                         MeshBufList &l = *i;
 379                         video::SMaterial &m = buf->getMaterial();
 380
 381                         // comparing a full material is quite expensive so we don't do it if
 382                         // not even first texture is equal
 383                         if (l.m.TextureLayer[0].Texture != m.TextureLayer[0].Texture)
 384                                 continue;
 385
 386                         if (l.m == m) {
 387                                 l.bufs.push_back(buf);
 388                                 return;
 389                         }
 390                 }
 391                 MeshBufList l;
 392                 l.m = buf->getMaterial();
 393                 l.bufs.push_back(buf);
 394                 lists.push_back(l);
 395         }
 396 };
 397
 398 void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
 399 {
 400         DSTACK(FUNCTION_NAME);
 401
 402         bool is_transparent_pass = pass == scene::ESNRP_TRANSPARENT;
 403
 404         std::string prefix;
 405         if(pass == scene::ESNRP_SOLID)
 406                 prefix = "CM: solid: ";
 407         else
 408                 prefix = "CM: transparent: ";
 409
 410         /*
 411                 This is called two times per frame, reset on the non-transparent one
 412         */
 413         if(pass == scene::ESNRP_SOLID)
 414         {
 415                 m_last_drawn_sectors.clear();
 416         }
 417
 418         /*
 419                 Get time for measuring timeout.
 420
 421                 Measuring time is very useful for long delays when the
 422                 machine is swapping a lot.
 423         */
 424         int time1 = time(0);
 425
 426         /*
 427                 Get animation parameters
 428         */
 429         float animation_time = m_client->getAnimationTime();
 430         int crack = m_client->getCrackLevel();
 431         u32 daynight_ratio = m_client->getEnv().getDayNightRatio();
 432
 433         v3f camera_position = m_camera_position;
 434         v3f camera_direction = m_camera_direction;
 435         f32 camera_fov = m_camera_fov;
 436
 437         /*
 438                 Get all blocks and draw all visible ones
 439         */
 440
 441         v3s16 cam_pos_nodes = floatToInt(camera_position, BS);
 442
 443         v3s16 box_nodes_d = m_control.wanted_range * v3s16(1,1,1);
 444
 445         v3s16 p_nodes_min = cam_pos_nodes - box_nodes_d;
 446         v3s16 p_nodes_max = cam_pos_nodes + box_nodes_d;
 447
 448         // Take a fair amount as we will be dropping more out later
 449         // Umm... these additions are a bit strange but they are needed.
 450         v3s16 p_blocks_min(
 451                         p_nodes_min.X / MAP_BLOCKSIZE - 3,
 452                         p_nodes_min.Y / MAP_BLOCKSIZE - 3,
 453                         p_nodes_min.Z / MAP_BLOCKSIZE - 3);
 454         v3s16 p_blocks_max(
 455                         p_nodes_max.X / MAP_BLOCKSIZE + 1,
 456                         p_nodes_max.Y / MAP_BLOCKSIZE + 1,
 457                         p_nodes_max.Z / MAP_BLOCKSIZE + 1);
 458
 459         u32 vertex_count = 0;
 460         u32 meshbuffer_count = 0;
 461
 462         // For limiting number of mesh animations per frame
 463         u32 mesh_animate_count = 0;
 464         u32 mesh_animate_count_far = 0;
 465
 466         // Blocks that were drawn and had a mesh
 467         u32 blocks_drawn = 0;
 468         // Blocks which had a corresponding meshbuffer for this pass
 469         u32 blocks_had_pass_meshbuf = 0;
 470         // Blocks from which stuff was actually drawn
 471         u32 blocks_without_stuff = 0;
 472
 473         /*
 474                 Draw the selected MapBlocks
 475         */
 476
 477         {
 478         ScopeProfiler sp(g_profiler, prefix+"drawing blocks", SPT_AVG);
 479
 480         MeshBufListList drawbufs;
 481
 482         for(std::map<v3s16, MapBlock*>::iterator
 483                         i = m_drawlist.begin();
 484                         i != m_drawlist.end(); ++i)
 485         {
 486                 MapBlock *block = i->second;
 487
 488                 // If the mesh of the block happened to get deleted, ignore it
 489                 if(block->mesh == NULL)
 490                         continue;
 491
 492                 float d = 0.0;
 493                 if(isBlockInSight(block->getPos(), camera_position,
 494                                 camera_direction, camera_fov,
 495                                 100000*BS, &d) == false)
 496                 {
 497                         continue;
 498                 }
 499
 500                 // Mesh animation
 501                 {
 502                         //MutexAutoLock lock(block->mesh_mutex);
 503                         MapBlockMesh *mapBlockMesh = block->mesh;
 504                         assert(mapBlockMesh);
 505                         // Pretty random but this should work somewhat nicely
 506                         bool faraway = d >= BS*50;
 507                         //bool faraway = d >= m_control.wanted_range * BS;
 508                         if(mapBlockMesh->isAnimationForced() ||
 509                                         !faraway ||
 510                                         mesh_animate_count_far < (m_control.range_all ? 200 : 50))
 511                         {
 512                                 bool animated = mapBlockMesh->animate(
 513                                                 faraway,
 514                                                 animation_time,
 515                                                 crack,
 516                                                 daynight_ratio);
 517                                 if(animated)
 518                                         mesh_animate_count++;
 519                                 if(animated && faraway)
 520                                         mesh_animate_count_far++;
 521                         }
 522                         else
 523                         {
 524                                 mapBlockMesh->decreaseAnimationForceTimer();
 525                         }
 526                 }
 527
 528                 /*
 529                         Get the meshbuffers of the block
 530                 */
 531                 {
 532                         //MutexAutoLock lock(block->mesh_mutex);
 533
 534                         MapBlockMesh *mapBlockMesh = block->mesh;
 535                         assert(mapBlockMesh);
 536
 537                         scene::IMesh *mesh = mapBlockMesh->getMesh();
 538                         assert(mesh);
 539
 540                         u32 c = mesh->getMeshBufferCount();
 541                         for(u32 i=0; i<c; i++)
 542                         {
 543                                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(i);
 544
 545                                 buf->getMaterial().setFlag(video::EMF_TRILINEAR_FILTER, m_cache_trilinear_filter);
 546                                 buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, m_cache_bilinear_filter);
 547                                 buf->getMaterial().setFlag(video::EMF_ANISOTROPIC_FILTER, m_cache_anistropic_filter);
 548
 549                                 const video::SMaterial& material = buf->getMaterial();
 550                                 video::IMaterialRenderer* rnd =
 551                                                 driver->getMaterialRenderer(material.MaterialType);
 552                                 bool transparent = (rnd && rnd->isTransparent());
 553                                 if(transparent == is_transparent_pass)
 554                                 {
 555                                         if(buf->getVertexCount() == 0)
 556                                                 errorstream<<"Block ["<<analyze_block(block)
 557                                                                 <<"] contains an empty meshbuf"<<std::endl;
 558                                         drawbufs.add(buf);
 559                                 }
 560                         }
 561                 }
 562         }
 563
 564         std::vector<MeshBufList> &lists = drawbufs.lists;
 565
 566         int timecheck_counter = 0;
 567         for(std::vector<MeshBufList>::iterator i = lists.begin();
 568                         i != lists.end(); ++i) {
 569                 timecheck_counter++;
 570                 if(timecheck_counter > 50) {
 571                         timecheck_counter = 0;
 572                         int time2 = time(0);
 573                         if(time2 > time1 + 4) {
 574                                 infostream << "ClientMap::renderMap(): "
 575                                         "Rendering takes ages, returning."
 576                                         << std::endl;
 577                                 return;
 578                         }
 579                 }
 580
 581                 MeshBufList &list = *i;
 582
 583                 driver->setMaterial(list.m);
 584
 585                 for(std::vector<scene::IMeshBuffer*>::iterator j = list.bufs.begin();
 586                                 j != list.bufs.end(); ++j) {
 587                         scene::IMeshBuffer *buf = *j;
 588                         driver->drawMeshBuffer(buf);
 589                         vertex_count += buf->getVertexCount();
 590                         meshbuffer_count++;
 591                 }
 592
 593         }
 594         } // ScopeProfiler
 595
 596         // Log only on solid pass because values are the same
 597         if(pass == scene::ESNRP_SOLID){
 598                 g_profiler->avg("CM: animated meshes", mesh_animate_count);
 599                 g_profiler->avg("CM: animated meshes (far)", mesh_animate_count_far);
 600         }
 601
 602         g_profiler->avg(prefix+"vertices drawn", vertex_count);
 603         if(blocks_had_pass_meshbuf != 0)
 604                 g_profiler->avg(prefix+"meshbuffers per block",
 605                                 (float)meshbuffer_count / (float)blocks_had_pass_meshbuf);
 606         if(blocks_drawn != 0)
 607                 g_profiler->avg(prefix+"empty blocks (frac)",
 608                                 (float)blocks_without_stuff / blocks_drawn);
 609
 610         /*infostream<<"renderMap(): is_transparent_pass="<<is_transparent_pass
 611                         <<", rendered "<<vertex_count<<" vertices."<<std::endl;*/
 612 }
 613
 614 static bool getVisibleBrightness(Map *map, v3f p0, v3f dir, float step,
 615                 float step_multiplier, float start_distance, float end_distance,
 616                 INodeDefManager *ndef, u32 daylight_factor, float sunlight_min_d,
 617                 int *result, bool *sunlight_seen)
 618 {
 619         int brightness_sum = 0;
 620         int brightness_count = 0;
 621         float distance = start_distance;
 622         dir.normalize();
 623         v3f pf = p0;
 624         pf += dir * distance;
 625         int noncount = 0;
 626         bool nonlight_seen = false;
 627         bool allow_allowing_non_sunlight_propagates = false;
 628         bool allow_non_sunlight_propagates = false;
 629         // Check content nearly at camera position
 630         {
 631                 v3s16 p = floatToInt(p0 /*+ dir * 3*BS*/, BS);
 632                 MapNode n = map->getNodeNoEx(p);
 633                 if(ndef->get(n).param_type == CPT_LIGHT &&
 634                                 !ndef->get(n).sunlight_propagates)
 635                         allow_allowing_non_sunlight_propagates = true;
 636         }
 637         // If would start at CONTENT_IGNORE, start closer
 638         {
 639                 v3s16 p = floatToInt(pf, BS);
 640                 MapNode n = map->getNodeNoEx(p);
 641                 if(n.getContent() == CONTENT_IGNORE){
 642                         float newd = 2*BS;
 643                         pf = p0 + dir * 2*newd;
 644                         distance = newd;
 645                         sunlight_min_d = 0;
 646                 }
 647         }
 648         for(int i=0; distance < end_distance; i++){
 649                 pf += dir * step;
 650                 distance += step;
 651                 step *= step_multiplier;
 652
 653                 v3s16 p = floatToInt(pf, BS);
 654                 MapNode n = map->getNodeNoEx(p);
 655                 if(allow_allowing_non_sunlight_propagates && i == 0 &&
 656                                 ndef->get(n).param_type == CPT_LIGHT &&
 657                                 !ndef->get(n).sunlight_propagates){
 658                         allow_non_sunlight_propagates = true;
 659                 }
 660                 if(ndef->get(n).param_type != CPT_LIGHT ||
 661                                 (!ndef->get(n).sunlight_propagates &&
 662                                         !allow_non_sunlight_propagates)){
 663                         nonlight_seen = true;
 664                         noncount++;
 665                         if(noncount >= 4)
 666                                 break;
 667                         continue;
 668                 }
 669                 if(distance >= sunlight_min_d && *sunlight_seen == false
 670                                 && nonlight_seen == false)
 671                         if(n.getLight(LIGHTBANK_DAY, ndef) == LIGHT_SUN)
 672                                 *sunlight_seen = true;
 673                 noncount = 0;
 674                 brightness_sum += decode_light(n.getLightBlend(daylight_factor, ndef));
 675                 brightness_count++;
 676         }
 677         *result = 0;
 678         if(brightness_count == 0)
 679                 return false;
 680         *result = brightness_sum / brightness_count;
 681         /*std::cerr<<"Sampled "<<brightness_count<<" points; result="
 682                         <<(*result)<<std::endl;*/
 683         return true;
 684 }
 685
 686 int ClientMap::getBackgroundBrightness(float max_d, u32 daylight_factor,
 687                 int oldvalue, bool *sunlight_seen_result)
 688 {
 689         const bool debugprint = false;
 690         INodeDefManager *ndef = m_gamedef->ndef();
 691         static v3f z_directions[50] = {
 692                 v3f(-100, 0, 0)
 693         };
 694         static f32 z_offsets[sizeof(z_directions)/sizeof(*z_directions)] = {
 695                 -1000,
 696         };
 697         if(z_directions[0].X < -99){
 698                 for(u32 i=0; i<sizeof(z_directions)/sizeof(*z_directions); i++){
 699                         z_directions[i] = v3f(
 700                                 0.01 * myrand_range(-100, 100),
 701                                 1.0,
 702                                 0.01 * myrand_range(-100, 100)
 703                         );
 704                         z_offsets[i] = 0.01 * myrand_range(0,100);
 705                 }
 706         }
 707         if(debugprint)
 708                 std::cerr<<"In goes "<<PP(m_camera_direction)<<", out comes ";
 709         int sunlight_seen_count = 0;
 710         float sunlight_min_d = max_d*0.8;
 711         if(sunlight_min_d > 35*BS)
 712                 sunlight_min_d = 35*BS;
 713         std::vector<int> values;
 714         for(u32 i=0; i<sizeof(z_directions)/sizeof(*z_directions); i++){
 715                 v3f z_dir = z_directions[i];
 716                 z_dir.normalize();
 717                 core::CMatrix4<f32> a;
 718                 a.buildRotateFromTo(v3f(0,1,0), z_dir);
 719                 v3f dir = m_camera_direction;
 720                 a.rotateVect(dir);
 721                 int br = 0;
 722                 float step = BS*1.5;
 723                 if(max_d > 35*BS)
 724                         step = max_d / 35 * 1.5;
 725                 float off = step * z_offsets[i];
 726                 bool sunlight_seen_now = false;
 727                 bool ok = getVisibleBrightness(this, m_camera_position, dir,
 728                                 step, 1.0, max_d*0.6+off, max_d, ndef, daylight_factor,
 729                                 sunlight_min_d,
 730                                 &br, &sunlight_seen_now);
 731                 if(sunlight_seen_now)
 732                         sunlight_seen_count++;
 733                 if(!ok)
 734                         continue;
 735                 values.push_back(br);
 736                 // Don't try too much if being in the sun is clear
 737                 if(sunlight_seen_count >= 20)
 738                         break;
 739         }
 740         int brightness_sum = 0;
 741         int brightness_count = 0;
 742         std::sort(values.begin(), values.end());
 743         u32 num_values_to_use = values.size();
 744         if(num_values_to_use >= 10)
 745                 num_values_to_use -= num_values_to_use/2;
 746         else if(num_values_to_use >= 7)
 747                 num_values_to_use -= num_values_to_use/3;
 748         u32 first_value_i = (values.size() - num_values_to_use) / 2;
 749         if(debugprint){
 750                 for(u32 i=0; i < first_value_i; i++)
 751                         std::cerr<<values[i]<<" ";
 752                 std::cerr<<"[";
 753         }
 754         for(u32 i=first_value_i; i < first_value_i+num_values_to_use; i++){
 755                 if(debugprint)
 756                         std::cerr<<values[i]<<" ";
 757                 brightness_sum += values[i];
 758                 brightness_count++;
 759         }
 760         if(debugprint){
 761                 std::cerr<<"]";
 762                 for(u32 i=first_value_i+num_values_to_use; i < values.size(); i++)
 763                         std::cerr<<values[i]<<" ";
 764         }
 765         int ret = 0;
 766         if(brightness_count == 0){
 767                 MapNode n = getNodeNoEx(floatToInt(m_camera_position, BS));
 768                 if(ndef->get(n).param_type == CPT_LIGHT){
 769                         ret = decode_light(n.getLightBlend(daylight_factor, ndef));
 770                 } else {
 771                         ret = oldvalue;
 772                 }
 773         } else {
 774                 /*float pre = (float)brightness_sum / (float)brightness_count;
 775                 float tmp = pre;
 776                 const float d = 0.2;
 777                 pre *= 1.0 + d*2;
 778                 pre -= tmp * d;
 779                 int preint = pre;
 780                 ret = MYMAX(0, MYMIN(255, preint));*/
 781                 ret = brightness_sum / brightness_count;
 782         }
 783         if(debugprint)
 784                 std::cerr<<"Result: "<<ret<<" sunlight_seen_count="
 785                                 <<sunlight_seen_count<<std::endl;
 786         *sunlight_seen_result = (sunlight_seen_count > 0);
 787         return ret;
 788 }
 789
 790 void ClientMap::renderPostFx(CameraMode cam_mode)
 791 {
 792         INodeDefManager *nodemgr = m_gamedef->ndef();
 793
 794         // Sadly ISceneManager has no "post effects" render pass, in that case we
 795         // could just register for that and handle it in renderMap().
 796
 797         MapNode n = getNodeNoEx(floatToInt(m_camera_position, BS));
 798
 799         // - If the player is in a solid node, make everything black.
 800         // - If the player is in liquid, draw a semi-transparent overlay.
 801         // - Do not if player is in third person mode
 802         const ContentFeatures& features = nodemgr->get(n);
 803         video::SColor post_effect_color = features.post_effect_color;
 804         if(features.solidness == 2 && !(g_settings->getBool("noclip") &&
 805                         m_gamedef->checkLocalPrivilege("noclip")) &&
 806                         cam_mode == CAMERA_MODE_FIRST)
 807         {
 808                 post_effect_color = video::SColor(255, 0, 0, 0);
 809         }
 810         if (post_effect_color.getAlpha() != 0)
 811         {
 812                 // Draw a full-screen rectangle
 813                 video::IVideoDriver* driver = SceneManager->getVideoDriver();
 814                 v2u32 ss = driver->getScreenSize();
 815                 core::rect<s32> rect(0,0, ss.X, ss.Y);
 816                 driver->draw2DRectangle(post_effect_color, rect);
 817         }
 818 }
 819
 820 void ClientMap::PrintInfo(std::ostream &out)
 821 {
 822         out<<"ClientMap: ";
 823 }
 824
 825