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