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 "util/basic_macros.h"
  34 #include <algorithm>
  35
  36 ClientMap::ClientMap(
  37                 Client *client,
  38                 IGameDef *gamedef,
  39                 MapDrawControl &control,
  40                 scene::ISceneNode* parent,
  41                 scene::ISceneManager* mgr,
  42                 s32 id
  43 ):
  44         Map(dout_client, gamedef),
  45         scene::ISceneNode(parent, mgr, id),
  46         m_client(client),
  47         m_control(control),
  48         m_camera_position(0,0,0),
  49         m_camera_direction(0,0,1),
  50         m_camera_fov(M_PI)
  51 {
  52         m_box = aabb3f(-BS*1000000,-BS*1000000,-BS*1000000,
  53                         BS*1000000,BS*1000000,BS*1000000);
  54
  55         /* TODO: Add a callback function so these can be updated when a setting
  56          *       changes.  At this point in time it doesn't matter (e.g. /set
  57          *       is documented to change server settings only)
  58          *
  59          * TODO: Local caching of settings is not optimal and should at some stage
  60          *       be updated to use a global settings object for getting thse values
  61          *       (as opposed to the this local caching). This can be addressed in
  62          *       a later release.
  63          */
  64         m_cache_trilinear_filter  = g_settings->getBool("trilinear_filter");
  65         m_cache_bilinear_filter   = g_settings->getBool("bilinear_filter");
  66         m_cache_anistropic_filter = g_settings->getBool("anisotropic_filter");
  67
  68 }
  69
  70 ClientMap::~ClientMap()
  71 {
  72         /*MutexAutoLock lock(mesh_mutex);
  73
  74         if(mesh != NULL)
  75         {
  76                 mesh->drop();
  77                 mesh = NULL;
  78         }*/
  79 }
  80
  81 MapSector * ClientMap::emergeSector(v2s16 p2d)
  82 {
  83         DSTACK(FUNCTION_NAME);
  84         // Check that it doesn't exist already
  85         try{
  86                 return getSectorNoGenerate(p2d);
  87         }
  88         catch(InvalidPositionException &e)
  89         {
  90         }
  91
  92         // Create a sector
  93         ClientMapSector *sector = new ClientMapSector(this, p2d, m_gamedef);
  94
  95         {
  96                 //MutexAutoLock lock(m_sector_mutex); // Bulk comment-out
  97                 m_sectors[p2d] = sector;
  98         }
  99
 100         return sector;
 101 }
 102
 103 void ClientMap::OnRegisterSceneNode()
 104 {
 105         if(IsVisible)
 106         {
 107                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
 108                 SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
 109         }
 110
 111         ISceneNode::OnRegisterSceneNode();
 112 }
 113
 114 static bool isOccluded(Map *map, v3s16 p0, v3s16 p1, float step, float stepfac,
 115                 float start_off, float end_off, u32 needed_count, INodeDefManager *nodemgr)
 116 {
 117         float d0 = (float)BS * p0.getDistanceFrom(p1);
 118         v3s16 u0 = p1 - p0;
 119         v3f uf = v3f(u0.X, u0.Y, u0.Z) * BS;
 120         uf.normalize();
 121         v3f p0f = v3f(p0.X, p0.Y, p0.Z) * BS;
 122         u32 count = 0;
 123         for(float s=start_off; s<d0+end_off; s+=step){
 124                 v3f pf = p0f + uf * s;
 125                 v3s16 p = floatToInt(pf, BS);
 126                 MapNode n = map->getNodeNoEx(p);
 127                 bool is_transparent = false;
 128                 const ContentFeatures &f = nodemgr->get(n);
 129                 if(f.solidness == 0)
 130                         is_transparent = (f.visual_solidness != 2);
 131                 else
 132                         is_transparent = (f.solidness != 2);
 133                 if(!is_transparent){
 134                         count++;
 135                         if(count >= needed_count)
 136                                 return true;
 137                 }
 138                 step *= stepfac;
 139         }
 140         return false;
 141 }
 142
 143 void ClientMap::getBlocksInViewRange(v3s16 cam_pos_nodes,
 144                 v3s16 *p_blocks_min, v3s16 *p_blocks_max)
 145 {
 146         v3s16 box_nodes_d = m_control.wanted_range * v3s16(1, 1, 1);
 147         // Define p_nodes_min/max as v3s32 because 'cam_pos_nodes -/+ box_nodes_d'
 148         // can exceed the range of v3s16 when a large view range is used near the
 149         // world edges.
 150         v3s32 p_nodes_min(
 151                 cam_pos_nodes.X - box_nodes_d.X,
 152                 cam_pos_nodes.Y - box_nodes_d.Y,
 153                 cam_pos_nodes.Z - box_nodes_d.Z);
 154         v3s32 p_nodes_max(
 155                 cam_pos_nodes.X + box_nodes_d.X,
 156                 cam_pos_nodes.Y + box_nodes_d.Y,
 157                 cam_pos_nodes.Z + box_nodes_d.Z);
 158         // Take a fair amount as we will be dropping more out later
 159         // Umm... these additions are a bit strange but they are needed.
 160         *p_blocks_min = v3s16(
 161                         p_nodes_min.X / MAP_BLOCKSIZE - 3,
 162                         p_nodes_min.Y / MAP_BLOCKSIZE - 3,
 163                         p_nodes_min.Z / MAP_BLOCKSIZE - 3);
 164         *p_blocks_max = v3s16(
 165                         p_nodes_max.X / MAP_BLOCKSIZE + 1,
 166                         p_nodes_max.Y / MAP_BLOCKSIZE + 1,
 167                         p_nodes_max.Z / MAP_BLOCKSIZE + 1);
 168 }
 169
 170 void ClientMap::updateDrawList(video::IVideoDriver* driver)
 171 {
 172         ScopeProfiler sp(g_profiler, "CM::updateDrawList()", SPT_AVG);
 173         g_profiler->add("CM::updateDrawList() count", 1);
 174
 175         for (std::map<v3s16, MapBlock*>::iterator i = m_drawlist.begin();
 176                         i != m_drawlist.end(); ++i) {
 177                 MapBlock *block = i->second;
 178                 block->refDrop();
 179         }
 180         m_drawlist.clear();
 181
 182         v3f camera_position = m_camera_position;
 183         v3f camera_direction = m_camera_direction;
 184         f32 camera_fov = m_camera_fov;
 185
 186         // Use a higher fov to accomodate faster camera movements.
 187         // Blocks are cropped better when they are drawn.
 188         // Or maybe they aren't? Well whatever.
 189         camera_fov *= 1.2;
 190
 191         v3s16 cam_pos_nodes = floatToInt(camera_position, BS);
 192         v3s16 p_blocks_min;
 193         v3s16 p_blocks_max;
 194         getBlocksInViewRange(cam_pos_nodes, &p_blocks_min, &p_blocks_max);
 195
 196         // Number of blocks in rendering range
 197         u32 blocks_in_range = 0;
 198         // Number of blocks occlusion culled
 199         u32 blocks_occlusion_culled = 0;
 200         // Number of blocks in rendering range but don't have a mesh
 201         u32 blocks_in_range_without_mesh = 0;
 202         // Blocks that had mesh that would have been drawn according to
 203         // rendering range (if max blocks limit didn't kick in)
 204         u32 blocks_would_have_drawn = 0;
 205         // Blocks that were drawn and had a mesh
 206         u32 blocks_drawn = 0;
 207         // Blocks which had a corresponding meshbuffer for this pass
 208         //u32 blocks_had_pass_meshbuf = 0;
 209         // Blocks from which stuff was actually drawn
 210         //u32 blocks_without_stuff = 0;
 211         // Distance to farthest drawn block
 212         float farthest_drawn = 0;
 213
 214         // No occlusion culling when free_move is on and camera is
 215         // inside ground
 216         bool occlusion_culling_enabled = true;
 217         if (g_settings->getBool("free_move")) {
 218                 MapNode n = getNodeNoEx(cam_pos_nodes);
 219                 if (n.getContent() == CONTENT_IGNORE ||
 220                                 m_nodedef->get(n).solidness == 2)
 221                         occlusion_culling_enabled = false;
 222         }
 223
 224         for (std::map<v2s16, MapSector*>::iterator si = m_sectors.begin();
 225                         si != m_sectors.end(); ++si) {
 226                 MapSector *sector = si->second;
 227                 v2s16 sp = sector->getPos();
 228
 229                 if (m_control.range_all == false) {
 230                         if (sp.X < p_blocks_min.X || sp.X > p_blocks_max.X ||
 231                                         sp.Y < p_blocks_min.Z || sp.Y > p_blocks_max.Z)
 232                                 continue;
 233                 }
 234
 235                 MapBlockVect sectorblocks;
 236                 sector->getBlocks(sectorblocks);
 237
 238                 /*
 239                         Loop through blocks in sector
 240                 */
 241
 242                 u32 sector_blocks_drawn = 0;
 243
 244                 for (MapBlockVect::iterator i = sectorblocks.begin();
 245                                 i != sectorblocks.end(); ++i) {
 246                         MapBlock *block = *i;
 247
 248                         /*
 249                                 Compare block position to camera position, skip
 250                                 if not seen on display
 251                         */
 252
 253                         if (block->mesh != NULL)
 254                                 block->mesh->updateCameraOffset(m_camera_offset);
 255
 256                         float range = 100000 * BS;
 257                         if (m_control.range_all == false)
 258                                 range = m_control.wanted_range * BS;
 259
 260                         float d = 0.0;
 261                         if (!isBlockInSight(block->getPos(), camera_position,
 262                                         camera_direction, camera_fov, range, &d))
 263                                 continue;
 264
 265                         blocks_in_range++;
 266
 267                         /*
 268                                 Ignore if mesh doesn't exist
 269                         */
 270                         if (block->mesh == NULL) {
 271                                 blocks_in_range_without_mesh++;
 272                                 continue;
 273                         }
 274
 275                         /*
 276                                 Occlusion culling
 277                         */
 278                         v3s16 cpn = block->getPos() * MAP_BLOCKSIZE;
 279                         cpn += v3s16(MAP_BLOCKSIZE / 2, MAP_BLOCKSIZE / 2, MAP_BLOCKSIZE / 2);
 280                         float step = BS * 1;
 281                         float stepfac = 1.1;
 282                         float startoff = BS * 1;
 283                         // The occlusion search of 'isOccluded()' must stop short of the target
 284                         // point by distance 'endoff' (end offset) to not enter the target mapblock.
 285                         // For the 8 mapblock corners 'endoff' must therefore be the maximum diagonal
 286                         // of a mapblock, because we must consider all view angles.
 287                         // sqrt(1^2 + 1^2 + 1^2) = 1.732
 288                         float endoff = -BS * MAP_BLOCKSIZE * 1.732050807569;
 289                         v3s16 spn = cam_pos_nodes;
 290                         s16 bs2 = MAP_BLOCKSIZE / 2 + 1;
 291                         // to reduce the likelihood of falsely occluded blocks
 292                         // require at least two solid blocks
 293                         // this is a HACK, we should think of a more precise algorithm
 294                         u32 needed_count = 2;
 295                         if (occlusion_culling_enabled &&
 296                                         // For the central point of the mapblock 'endoff' can be halved
 297                                         isOccluded(this, spn, cpn,
 298                                                 step, stepfac, startoff, endoff / 2.0f, needed_count, m_nodedef) &&
 299                                         isOccluded(this, spn, cpn + v3s16(bs2,bs2,bs2),
 300                                                 step, stepfac, startoff, endoff, needed_count, m_nodedef) &&
 301                                         isOccluded(this, spn, cpn + v3s16(bs2,bs2,-bs2),
 302                                                 step, stepfac, startoff, endoff, needed_count, m_nodedef) &&
 303                                         isOccluded(this, spn, cpn + v3s16(bs2,-bs2,bs2),
 304                                                 step, stepfac, startoff, endoff, needed_count, m_nodedef) &&
 305                                         isOccluded(this, spn, cpn + v3s16(bs2,-bs2,-bs2),
 306                                                 step, stepfac, startoff, endoff, needed_count, m_nodedef) &&
 307                                         isOccluded(this, spn, cpn + v3s16(-bs2,bs2,bs2),
 308                                                 step, stepfac, startoff, endoff, needed_count, m_nodedef) &&
 309                                         isOccluded(this, spn, cpn + v3s16(-bs2,bs2,-bs2),
 310                                                 step, stepfac, startoff, endoff, needed_count, m_nodedef) &&
 311                                         isOccluded(this, spn, cpn + v3s16(-bs2,-bs2,bs2),
 312                                                 step, stepfac, startoff, endoff, needed_count, m_nodedef) &&
 313                                         isOccluded(this, spn, cpn + v3s16(-bs2,-bs2,-bs2),
 314                                                 step, stepfac, startoff, endoff, needed_count, m_nodedef)) {
 315                                 blocks_occlusion_culled++;
 316                                 continue;
 317                         }
 318
 319                         // This block is in range. Reset usage timer.
 320                         block->resetUsageTimer();
 321
 322                         // Limit block count in case of a sudden increase
 323                         blocks_would_have_drawn++;
 324                         if (blocks_drawn >= m_control.wanted_max_blocks &&
 325                                         !m_control.range_all &&
 326                                         d > m_control.wanted_range * BS)
 327                                 continue;
 328
 329                         // Add to set
 330                         block->refGrab();
 331                         m_drawlist[block->getPos()] = block;
 332
 333                         sector_blocks_drawn++;
 334                         blocks_drawn++;
 335                         if (d / BS > farthest_drawn)
 336                                 farthest_drawn = d / BS;
 337
 338                 } // foreach sectorblocks
 339
 340                 if (sector_blocks_drawn != 0)
 341                         m_last_drawn_sectors.insert(sp);
 342         }
 343
 344         m_control.blocks_would_have_drawn = blocks_would_have_drawn;
 345         m_control.blocks_drawn = blocks_drawn;
 346         m_control.farthest_drawn = farthest_drawn;
 347
 348         g_profiler->avg("CM: blocks in range", blocks_in_range);
 349         g_profiler->avg("CM: blocks occlusion culled", blocks_occlusion_culled);
 350         if (blocks_in_range != 0)
 351                 g_profiler->avg("CM: blocks in range without mesh (frac)",
 352                                 (float)blocks_in_range_without_mesh / blocks_in_range);
 353         g_profiler->avg("CM: blocks drawn", blocks_drawn);
 354         g_profiler->avg("CM: farthest drawn", farthest_drawn);
 355         g_profiler->avg("CM: wanted max blocks", m_control.wanted_max_blocks);
 356 }
 357
 358 struct MeshBufList
 359 {
 360         video::SMaterial m;
 361         std::vector<scene::IMeshBuffer*> bufs;
 362 };
 363
 364 struct MeshBufListList
 365 {
 366         std::vector<MeshBufList> lists;
 367
 368         void clear()
 369         {
 370                 lists.clear();
 371         }
 372
 373         void add(scene::IMeshBuffer *buf)
 374         {
 375                 for(std::vector<MeshBufList>::iterator i = lists.begin();
 376                                 i != lists.end(); ++i){
 377                         MeshBufList &l = *i;
 378                         video::SMaterial &m = buf->getMaterial();
 379
 380                         // comparing a full material is quite expensive so we don't do it if
 381                         // not even first texture is equal
 382                         if (l.m.TextureLayer[0].Texture != m.TextureLayer[0].Texture)
 383                                 continue;
 384
 385                         if (l.m == m) {
 386                                 l.bufs.push_back(buf);
 387                                 return;
 388                         }
 389                 }
 390                 MeshBufList l;
 391                 l.m = buf->getMaterial();
 392                 l.bufs.push_back(buf);
 393                 lists.push_back(l);
 394         }
 395 };
 396
 397 void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
 398 {
 399         DSTACK(FUNCTION_NAME);
 400
 401         bool is_transparent_pass = pass == scene::ESNRP_TRANSPARENT;
 402
 403         std::string prefix;
 404         if (pass == scene::ESNRP_SOLID)
 405                 prefix = "CM: solid: ";
 406         else
 407                 prefix = "CM: transparent: ";
 408
 409         /*
 410                 This is called two times per frame, reset on the non-transparent one
 411         */
 412         if (pass == scene::ESNRP_SOLID)
 413                 m_last_drawn_sectors.clear();
 414
 415         /*
 416                 Get time for measuring timeout.
 417
 418                 Measuring time is very useful for long delays when the
 419                 machine is swapping a lot.
 420         */
 421         int time1 = time(0);
 422
 423         /*
 424                 Get animation parameters
 425         */
 426         float animation_time = m_client->getAnimationTime();
 427         int crack = m_client->getCrackLevel();
 428         u32 daynight_ratio = m_client->getEnv().getDayNightRatio();
 429
 430         v3f camera_position = m_camera_position;
 431         v3f camera_direction = m_camera_direction;
 432         f32 camera_fov = m_camera_fov;
 433
 434         /*
 435                 Get all blocks and draw all visible ones
 436         */
 437
 438         u32 vertex_count = 0;
 439         u32 meshbuffer_count = 0;
 440
 441         // For limiting number of mesh animations per frame
 442         u32 mesh_animate_count = 0;
 443         u32 mesh_animate_count_far = 0;
 444
 445         // Blocks that were drawn and had a mesh
 446         u32 blocks_drawn = 0;
 447         // Blocks which had a corresponding meshbuffer for this pass
 448         u32 blocks_had_pass_meshbuf = 0;
 449         // Blocks from which stuff was actually drawn
 450         u32 blocks_without_stuff = 0;
 451
 452         /*
 453                 Draw the selected MapBlocks
 454         */
 455
 456         {
 457         ScopeProfiler sp(g_profiler, prefix + "drawing blocks", SPT_AVG);
 458
 459         MeshBufListList drawbufs;
 460
 461         for (std::map<v3s16, MapBlock*>::iterator i = m_drawlist.begin();
 462                         i != m_drawlist.end(); ++i) {
 463                 MapBlock *block = i->second;
 464
 465                 // If the mesh of the block happened to get deleted, ignore it
 466                 if (block->mesh == NULL)
 467                         continue;
 468
 469                 float d = 0.0;
 470                 if (!isBlockInSight(block->getPos(), camera_position,
 471                                 camera_direction, camera_fov, 100000 * BS, &d))
 472                         continue;
 473
 474                 // Mesh animation
 475                 {
 476                         //MutexAutoLock lock(block->mesh_mutex);
 477                         MapBlockMesh *mapBlockMesh = block->mesh;
 478                         assert(mapBlockMesh);
 479                         // Pretty random but this should work somewhat nicely
 480                         bool faraway = d >= BS * 50;
 481                         //bool faraway = d >= m_control.wanted_range * BS;
 482                         if (mapBlockMesh->isAnimationForced() || !faraway ||
 483                                         mesh_animate_count_far < (m_control.range_all ? 200 : 50)) {
 484                                 bool animated = mapBlockMesh->animate(faraway, animation_time,
 485                                         crack, daynight_ratio);
 486                                 if (animated)
 487                                         mesh_animate_count++;
 488                                 if (animated && faraway)
 489                                         mesh_animate_count_far++;
 490                         } else {
 491                                 mapBlockMesh->decreaseAnimationForceTimer();
 492                         }
 493                 }
 494
 495                 /*
 496                         Get the meshbuffers of the block
 497                 */
 498                 {
 499                         //MutexAutoLock lock(block->mesh_mutex);
 500
 501                         MapBlockMesh *mapBlockMesh = block->mesh;
 502                         assert(mapBlockMesh);
 503
 504                         scene::IMesh *mesh = mapBlockMesh->getMesh();
 505                         assert(mesh);
 506
 507                         u32 c = mesh->getMeshBufferCount();
 508                         for (u32 i = 0; i < c; i++)
 509                         {
 510                                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(i);
 511
 512                                 buf->getMaterial().setFlag(video::EMF_TRILINEAR_FILTER, m_cache_trilinear_filter);
 513                                 buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, m_cache_bilinear_filter);
 514                                 buf->getMaterial().setFlag(video::EMF_ANISOTROPIC_FILTER, m_cache_anistropic_filter);
 515                                 buf->getMaterial().setFlag(video::EMF_WIREFRAME, m_control.show_wireframe);
 516
 517                                 const video::SMaterial& material = buf->getMaterial();
 518                                 video::IMaterialRenderer* rnd =
 519                                                 driver->getMaterialRenderer(material.MaterialType);
 520                                 bool transparent = (rnd && rnd->isTransparent());
 521                                 if (transparent == is_transparent_pass) {
 522                                         if (buf->getVertexCount() == 0)
 523                                                 errorstream << "Block [" << analyze_block(block)
 524                                                          << "] contains an empty meshbuf" << std::endl;
 525                                         drawbufs.add(buf);
 526                                 }
 527                         }
 528                 }
 529         }
 530
 531         std::vector<MeshBufList> &lists = drawbufs.lists;
 532
 533         int timecheck_counter = 0;
 534         for (std::vector<MeshBufList>::iterator i = lists.begin();
 535                         i != lists.end(); ++i) {
 536                 timecheck_counter++;
 537                 if (timecheck_counter > 50) {
 538                         timecheck_counter = 0;
 539                         int time2 = time(0);
 540                         if (time2 > time1 + 4) {
 541                                 infostream << "ClientMap::renderMap(): "
 542                                         "Rendering takes ages, returning."
 543                                         << std::endl;
 544                                 return;
 545                         }
 546                 }
 547
 548                 MeshBufList &list = *i;
 549
 550                 driver->setMaterial(list.m);
 551
 552                 for (std::vector<scene::IMeshBuffer*>::iterator j = list.bufs.begin();
 553                                 j != list.bufs.end(); ++j) {
 554                         scene::IMeshBuffer *buf = *j;
 555                         driver->drawMeshBuffer(buf);
 556                         vertex_count += buf->getVertexCount();
 557                         meshbuffer_count++;
 558                 }
 559
 560         }
 561         } // ScopeProfiler
 562
 563         // Log only on solid pass because values are the same
 564         if (pass == scene::ESNRP_SOLID) {
 565                 g_profiler->avg("CM: animated meshes", mesh_animate_count);
 566                 g_profiler->avg("CM: animated meshes (far)", mesh_animate_count_far);
 567         }
 568
 569         g_profiler->avg(prefix + "vertices drawn", vertex_count);
 570         if (blocks_had_pass_meshbuf != 0)
 571                 g_profiler->avg(prefix + "meshbuffers per block",
 572                         (float)meshbuffer_count / (float)blocks_had_pass_meshbuf);
 573         if (blocks_drawn != 0)
 574                 g_profiler->avg(prefix + "empty blocks (frac)",
 575                         (float)blocks_without_stuff / blocks_drawn);
 576
 577         /*infostream<<"renderMap(): is_transparent_pass="<<is_transparent_pass
 578                         <<", rendered "<<vertex_count<<" vertices."<<std::endl;*/
 579 }
 580
 581 static bool getVisibleBrightness(Map *map, v3f p0, v3f dir, float step,
 582                 float step_multiplier, float start_distance, float end_distance,
 583                 INodeDefManager *ndef, u32 daylight_factor, float sunlight_min_d,
 584                 int *result, bool *sunlight_seen)
 585 {
 586         int brightness_sum = 0;
 587         int brightness_count = 0;
 588         float distance = start_distance;
 589         dir.normalize();
 590         v3f pf = p0;
 591         pf += dir * distance;
 592         int noncount = 0;
 593         bool nonlight_seen = false;
 594         bool allow_allowing_non_sunlight_propagates = false;
 595         bool allow_non_sunlight_propagates = false;
 596         // Check content nearly at camera position
 597         {
 598                 v3s16 p = floatToInt(p0 /*+ dir * 3*BS*/, BS);
 599                 MapNode n = map->getNodeNoEx(p);
 600                 if(ndef->get(n).param_type == CPT_LIGHT &&
 601                                 !ndef->get(n).sunlight_propagates)
 602                         allow_allowing_non_sunlight_propagates = true;
 603         }
 604         // If would start at CONTENT_IGNORE, start closer
 605         {
 606                 v3s16 p = floatToInt(pf, BS);
 607                 MapNode n = map->getNodeNoEx(p);
 608                 if(n.getContent() == CONTENT_IGNORE){
 609                         float newd = 2*BS;
 610                         pf = p0 + dir * 2*newd;
 611                         distance = newd;
 612                         sunlight_min_d = 0;
 613                 }
 614         }
 615         for(int i=0; distance < end_distance; i++){
 616                 pf += dir * step;
 617                 distance += step;
 618                 step *= step_multiplier;
 619
 620                 v3s16 p = floatToInt(pf, BS);
 621                 MapNode n = map->getNodeNoEx(p);
 622                 if(allow_allowing_non_sunlight_propagates && i == 0 &&
 623                                 ndef->get(n).param_type == CPT_LIGHT &&
 624                                 !ndef->get(n).sunlight_propagates){
 625                         allow_non_sunlight_propagates = true;
 626                 }
 627                 if(ndef->get(n).param_type != CPT_LIGHT ||
 628                                 (!ndef->get(n).sunlight_propagates &&
 629                                         !allow_non_sunlight_propagates)){
 630                         nonlight_seen = true;
 631                         noncount++;
 632                         if(noncount >= 4)
 633                                 break;
 634                         continue;
 635                 }
 636                 if(distance >= sunlight_min_d && *sunlight_seen == false
 637                                 && nonlight_seen == false)
 638                         if(n.getLight(LIGHTBANK_DAY, ndef) == LIGHT_SUN)
 639                                 *sunlight_seen = true;
 640                 noncount = 0;
 641                 brightness_sum += decode_light(n.getLightBlend(daylight_factor, ndef));
 642                 brightness_count++;
 643         }
 644         *result = 0;
 645         if(brightness_count == 0)
 646                 return false;
 647         *result = brightness_sum / brightness_count;
 648         /*std::cerr<<"Sampled "<<brightness_count<<" points; result="
 649                         <<(*result)<<std::endl;*/
 650         return true;
 651 }
 652
 653 int ClientMap::getBackgroundBrightness(float max_d, u32 daylight_factor,
 654                 int oldvalue, bool *sunlight_seen_result)
 655 {
 656         const bool debugprint = false;
 657         static v3f z_directions[50] = {
 658                 v3f(-100, 0, 0)
 659         };
 660         static f32 z_offsets[sizeof(z_directions)/sizeof(*z_directions)] = {
 661                 -1000,
 662         };
 663         if(z_directions[0].X < -99){
 664                 for(u32 i=0; i<sizeof(z_directions)/sizeof(*z_directions); i++){
 665                         z_directions[i] = v3f(
 666                                 0.01 * myrand_range(-100, 100),
 667                                 1.0,
 668                                 0.01 * myrand_range(-100, 100)
 669                         );
 670                         z_offsets[i] = 0.01 * myrand_range(0,100);
 671                 }
 672         }
 673         if(debugprint)
 674                 std::cerr<<"In goes "<<PP(m_camera_direction)<<", out comes ";
 675         int sunlight_seen_count = 0;
 676         float sunlight_min_d = max_d*0.8;
 677         if(sunlight_min_d > 35*BS)
 678                 sunlight_min_d = 35*BS;
 679         std::vector<int> values;
 680         for(u32 i=0; i<sizeof(z_directions)/sizeof(*z_directions); i++){
 681                 v3f z_dir = z_directions[i];
 682                 z_dir.normalize();
 683                 core::CMatrix4<f32> a;
 684                 a.buildRotateFromTo(v3f(0,1,0), z_dir);
 685                 v3f dir = m_camera_direction;
 686                 a.rotateVect(dir);
 687                 int br = 0;
 688                 float step = BS*1.5;
 689                 if(max_d > 35*BS)
 690                         step = max_d / 35 * 1.5;
 691                 float off = step * z_offsets[i];
 692                 bool sunlight_seen_now = false;
 693                 bool ok = getVisibleBrightness(this, m_camera_position, dir,
 694                                 step, 1.0, max_d*0.6+off, max_d, m_nodedef, daylight_factor,
 695                                 sunlight_min_d,
 696                                 &br, &sunlight_seen_now);
 697                 if(sunlight_seen_now)
 698                         sunlight_seen_count++;
 699                 if(!ok)
 700                         continue;
 701                 values.push_back(br);
 702                 // Don't try too much if being in the sun is clear
 703                 if(sunlight_seen_count >= 20)
 704                         break;
 705         }
 706         int brightness_sum = 0;
 707         int brightness_count = 0;
 708         std::sort(values.begin(), values.end());
 709         u32 num_values_to_use = values.size();
 710         if(num_values_to_use >= 10)
 711                 num_values_to_use -= num_values_to_use/2;
 712         else if(num_values_to_use >= 7)
 713                 num_values_to_use -= num_values_to_use/3;
 714         u32 first_value_i = (values.size() - num_values_to_use) / 2;
 715         if(debugprint){
 716                 for(u32 i=0; i < first_value_i; i++)
 717                         std::cerr<<values[i]<<" ";
 718                 std::cerr<<"[";
 719         }
 720         for(u32 i=first_value_i; i < first_value_i+num_values_to_use; i++){
 721                 if(debugprint)
 722                         std::cerr<<values[i]<<" ";
 723                 brightness_sum += values[i];
 724                 brightness_count++;
 725         }
 726         if(debugprint){
 727                 std::cerr<<"]";
 728                 for(u32 i=first_value_i+num_values_to_use; i < values.size(); i++)
 729                         std::cerr<<values[i]<<" ";
 730         }
 731         int ret = 0;
 732         if(brightness_count == 0){
 733                 MapNode n = getNodeNoEx(floatToInt(m_camera_position, BS));
 734                 if(m_nodedef->get(n).param_type == CPT_LIGHT){
 735                         ret = decode_light(n.getLightBlend(daylight_factor, m_nodedef));
 736                 } else {
 737                         ret = oldvalue;
 738                 }
 739         } else {
 740                 /*float pre = (float)brightness_sum / (float)brightness_count;
 741                 float tmp = pre;
 742                 const float d = 0.2;
 743                 pre *= 1.0 + d*2;
 744                 pre -= tmp * d;
 745                 int preint = pre;
 746                 ret = MYMAX(0, MYMIN(255, preint));*/
 747                 ret = brightness_sum / brightness_count;
 748         }
 749         if(debugprint)
 750                 std::cerr<<"Result: "<<ret<<" sunlight_seen_count="
 751                                 <<sunlight_seen_count<<std::endl;
 752         *sunlight_seen_result = (sunlight_seen_count > 0);
 753         return ret;
 754 }
 755
 756 void ClientMap::renderPostFx(CameraMode cam_mode)
 757 {
 758         // Sadly ISceneManager has no "post effects" render pass, in that case we
 759         // could just register for that and handle it in renderMap().
 760
 761         MapNode n = getNodeNoEx(floatToInt(m_camera_position, BS));
 762
 763         // - If the player is in a solid node, make everything black.
 764         // - If the player is in liquid, draw a semi-transparent overlay.
 765         // - Do not if player is in third person mode
 766         const ContentFeatures& features = m_nodedef->get(n);
 767         video::SColor post_effect_color = features.post_effect_color;
 768         if(features.solidness == 2 && !(g_settings->getBool("noclip") &&
 769                         m_gamedef->checkLocalPrivilege("noclip")) &&
 770                         cam_mode == CAMERA_MODE_FIRST)
 771         {
 772                 post_effect_color = video::SColor(255, 0, 0, 0);
 773         }
 774         if (post_effect_color.getAlpha() != 0)
 775         {
 776                 // Draw a full-screen rectangle
 777                 video::IVideoDriver* driver = SceneManager->getVideoDriver();
 778                 v2u32 ss = driver->getScreenSize();
 779                 core::rect<s32> rect(0,0, ss.X, ss.Y);
 780                 driver->draw2DRectangle(post_effect_color, rect);
 781         }
 782 }
 783
 784 void ClientMap::PrintInfo(std::ostream &out)
 785 {
 786         out<<"ClientMap: ";
 787 }
 788
 789