src/environment.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 <fstream>
  21 #include "environment.h"
  22 #include "collision.h"
  23 #include "raycast.h"
  24 #include "scripting_server.h"
  25 #include "server.h"
  26 #include "daynightratio.h"
  27 #include "emerge.h"
  28
  29
  30 Environment::Environment(IGameDef *gamedef):
  31         m_time_of_day_speed(0.0f),
  32         m_day_count(0),
  33         m_gamedef(gamedef)
  34 {
  35         m_cache_enable_shaders = g_settings->getBool("enable_shaders");
  36         m_cache_active_block_mgmt_interval = g_settings->getFloat("active_block_mgmt_interval");
  37         m_cache_abm_interval = g_settings->getFloat("abm_interval");
  38         m_cache_nodetimer_interval = g_settings->getFloat("nodetimer_interval");
  39
  40         m_time_of_day = g_settings->getU32("world_start_time");
  41         m_time_of_day_f = (float)m_time_of_day / 24000.0f;
  42 }
  43
  44 u32 Environment::getDayNightRatio()
  45 {
  46         MutexAutoLock lock(this->m_time_lock);
  47         if (m_enable_day_night_ratio_override)
  48                 return m_day_night_ratio_override;
  49         return time_to_daynight_ratio(m_time_of_day_f * 24000, m_cache_enable_shaders);
  50 }
  51
  52 void Environment::setTimeOfDaySpeed(float speed)
  53 {
  54         m_time_of_day_speed = speed;
  55 }
  56
  57 void Environment::setDayNightRatioOverride(bool enable, u32 value)
  58 {
  59         MutexAutoLock lock(this->m_time_lock);
  60         m_enable_day_night_ratio_override = enable;
  61         m_day_night_ratio_override = value;
  62 }
  63
  64 void Environment::setTimeOfDay(u32 time)
  65 {
  66         MutexAutoLock lock(this->m_time_lock);
  67         if (m_time_of_day > time)
  68                 ++m_day_count;
  69         m_time_of_day = time;
  70         m_time_of_day_f = (float)time / 24000.0;
  71 }
  72
  73 u32 Environment::getTimeOfDay()
  74 {
  75         MutexAutoLock lock(this->m_time_lock);
  76         return m_time_of_day;
  77 }
  78
  79 float Environment::getTimeOfDayF()
  80 {
  81         MutexAutoLock lock(this->m_time_lock);
  82         return m_time_of_day_f;
  83 }
  84
  85 bool Environment::line_of_sight(v3f pos1, v3f pos2, v3s16 *p)
  86 {
  87         // Iterate trough nodes on the line
  88         voxalgo::VoxelLineIterator iterator(pos1 / BS, (pos2 - pos1) / BS);
  89         do {
  90                 MapNode n = getMap().getNode(iterator.m_current_node_pos);
  91
  92                 // Return non-air
  93                 if (n.param0 != CONTENT_AIR) {
  94                         if (p)
  95                                 *p = iterator.m_current_node_pos;
  96                         return false;
  97                 }
  98                 iterator.next();
  99         } while (iterator.m_current_index <= iterator.m_last_index);
 100         return true;
 101 }
 102
 103 /*
 104         Check if a node is pointable
 105 */
 106 inline static bool isPointableNode(const MapNode &n,
 107         const NodeDefManager *nodedef , bool liquids_pointable)
 108 {
 109         const ContentFeatures &features = nodedef->get(n);
 110         return features.pointable ||
 111                (liquids_pointable && features.isLiquid());
 112 }
 113
 114 void Environment::continueRaycast(RaycastState *state, PointedThing *result)
 115 {
 116         const NodeDefManager *nodedef = getMap().getNodeDefManager();
 117         if (state->m_initialization_needed) {
 118                 // Add objects
 119                 if (state->m_objects_pointable) {
 120                         std::vector<PointedThing> found;
 121                         getSelectedActiveObjects(state->m_shootline, found);
 122                         for (const PointedThing &pointed : found) {
 123                                 state->m_found.push(pointed);
 124                         }
 125                 }
 126                 // Set search range
 127                 core::aabbox3d<s16> maximal_exceed = nodedef->getSelectionBoxIntUnion();
 128                 state->m_search_range.MinEdge = -maximal_exceed.MaxEdge;
 129                 state->m_search_range.MaxEdge = -maximal_exceed.MinEdge;
 130                 // Setting is done
 131                 state->m_initialization_needed = false;
 132         }
 133
 134         // The index of the first pointed thing that was not returned
 135         // before. The last index which needs to be tested.
 136         s16 lastIndex = state->m_iterator.m_last_index;
 137         if (!state->m_found.empty()) {
 138                 lastIndex = state->m_iterator.getIndex(
 139                         floatToInt(state->m_found.top().intersection_point, BS));
 140         }
 141
 142         Map &map = getMap();
 143         // If a node is found, this is the center of the
 144         // first nodebox the shootline meets.
 145         v3f found_boxcenter(0, 0, 0);
 146         // The untested nodes are in this range.
 147         core::aabbox3d<s16> new_nodes;
 148         while (state->m_iterator.m_current_index <= lastIndex) {
 149                 // Test the nodes around the current node in search_range.
 150                 new_nodes = state->m_search_range;
 151                 new_nodes.MinEdge += state->m_iterator.m_current_node_pos;
 152                 new_nodes.MaxEdge += state->m_iterator.m_current_node_pos;
 153
 154                 // Only check new nodes
 155                 v3s16 delta = state->m_iterator.m_current_node_pos
 156                         - state->m_previous_node;
 157                 if (delta.X > 0) {
 158                         new_nodes.MinEdge.X = new_nodes.MaxEdge.X;
 159                 } else if (delta.X < 0) {
 160                         new_nodes.MaxEdge.X = new_nodes.MinEdge.X;
 161                 } else if (delta.Y > 0) {
 162                         new_nodes.MinEdge.Y = new_nodes.MaxEdge.Y;
 163                 } else if (delta.Y < 0) {
 164                         new_nodes.MaxEdge.Y = new_nodes.MinEdge.Y;
 165                 } else if (delta.Z > 0) {
 166                         new_nodes.MinEdge.Z = new_nodes.MaxEdge.Z;
 167                 } else if (delta.Z < 0) {
 168                         new_nodes.MaxEdge.Z = new_nodes.MinEdge.Z;
 169                 }
 170
 171                 // For each untested node
 172                 for (s16 x = new_nodes.MinEdge.X; x <= new_nodes.MaxEdge.X; x++)
 173                 for (s16 y = new_nodes.MinEdge.Y; y <= new_nodes.MaxEdge.Y; y++)
 174                 for (s16 z = new_nodes.MinEdge.Z; z <= new_nodes.MaxEdge.Z; z++) {
 175                         MapNode n;
 176                         v3s16 np(x, y, z);
 177                         bool is_valid_position;
 178
 179                         n = map.getNode(np, &is_valid_position);
 180                         if (!(is_valid_position && isPointableNode(n, nodedef,
 181                                         state->m_liquids_pointable))) {
 182                                 continue;
 183                         }
 184
 185                         PointedThing result;
 186
 187                         std::vector<aabb3f> boxes;
 188                         n.getSelectionBoxes(nodedef, &boxes,
 189                                 n.getNeighbors(np, &map));
 190
 191                         // Is there a collision with a selection box?
 192                         bool is_colliding = false;
 193                         // Minimal distance of all collisions
 194                         float min_distance_sq = 10000000;
 195                         // ID of the current box (loop counter)
 196                         u16 id = 0;
 197
 198                         v3f npf = intToFloat(np, BS);
 199                         // This loop translates the boxes to their in-world place.
 200                         for (aabb3f &box : boxes) {
 201                                 box.MinEdge += npf;
 202                                 box.MaxEdge += npf;
 203
 204                                 v3f intersection_point;
 205                                 v3s16 intersection_normal;
 206                                 if (!boxLineCollision(box, state->m_shootline.start,
 207                                                 state->m_shootline.getVector(), &intersection_point,
 208                                                 &intersection_normal)) {
 209                                         ++id;
 210                                         continue;
 211                                 }
 212
 213                                 f32 distanceSq = (intersection_point
 214                                         - state->m_shootline.start).getLengthSQ();
 215                                 // If this is the nearest collision, save it
 216                                 if (min_distance_sq > distanceSq) {
 217                                         min_distance_sq = distanceSq;
 218                                         result.intersection_point = intersection_point;
 219                                         result.intersection_normal = intersection_normal;
 220                                         result.box_id = id;
 221                                         found_boxcenter = box.getCenter();
 222                                         is_colliding = true;
 223                                 }
 224                                 ++id;
 225                         }
 226                         // If there wasn't a collision, stop
 227                         if (!is_colliding) {
 228                                 continue;
 229                         }
 230                         result.type = POINTEDTHING_NODE;
 231                         result.node_undersurface = np;
 232                         result.distanceSq = min_distance_sq;
 233                         // Set undersurface and abovesurface nodes
 234                         f32 d = 0.002 * BS;
 235                         v3f fake_intersection = result.intersection_point;
 236                         // Move intersection towards its source block.
 237                         if (fake_intersection.X < found_boxcenter.X) {
 238                                 fake_intersection.X += d;
 239                         } else {
 240                                 fake_intersection.X -= d;
 241                         }
 242                         if (fake_intersection.Y < found_boxcenter.Y) {
 243                                 fake_intersection.Y += d;
 244                         } else {
 245                                 fake_intersection.Y -= d;
 246                         }
 247                         if (fake_intersection.Z < found_boxcenter.Z) {
 248                                 fake_intersection.Z += d;
 249                         } else {
 250                                 fake_intersection.Z -= d;
 251                         }
 252                         result.node_real_undersurface = floatToInt(
 253                                 fake_intersection, BS);
 254                         result.node_abovesurface = result.node_real_undersurface
 255                                 + result.intersection_normal;
 256                         // Push found PointedThing
 257                         state->m_found.push(result);
 258                         // If this is nearer than the old nearest object,
 259                         // the search can be shorter
 260                         s16 newIndex = state->m_iterator.getIndex(
 261                                 result.node_real_undersurface);
 262                         if (newIndex < lastIndex) {
 263                                 lastIndex = newIndex;
 264                         }
 265                 }
 266                 // Next node
 267                 state->m_previous_node = state->m_iterator.m_current_node_pos;
 268                 state->m_iterator.next();
 269         }
 270         // Return empty PointedThing if nothing left on the ray
 271         if (state->m_found.empty()) {
 272                 result->type = POINTEDTHING_NOTHING;
 273         } else {
 274                 *result = state->m_found.top();
 275                 state->m_found.pop();
 276         }
 277 }
 278
 279 void Environment::stepTimeOfDay(float dtime)
 280 {
 281         MutexAutoLock lock(this->m_time_lock);
 282
 283         // Cached in order to prevent the two reads we do to give
 284         // different results (can be written by code not under the lock)
 285         f32 cached_time_of_day_speed = m_time_of_day_speed;
 286
 287         f32 speed = cached_time_of_day_speed * 24000. / (24. * 3600);
 288         m_time_conversion_skew += dtime;
 289         u32 units = (u32)(m_time_conversion_skew * speed);
 290         bool sync_f = false;
 291         if (units > 0) {
 292                 // Sync at overflow
 293                 if (m_time_of_day + units >= 24000) {
 294                         sync_f = true;
 295                         ++m_day_count;
 296                 }
 297                 m_time_of_day = (m_time_of_day + units) % 24000;
 298                 if (sync_f)
 299                         m_time_of_day_f = (float)m_time_of_day / 24000.0;
 300         }
 301         if (speed > 0) {
 302                 m_time_conversion_skew -= (f32)units / speed;
 303         }
 304         if (!sync_f) {
 305                 m_time_of_day_f += cached_time_of_day_speed / 24 / 3600 * dtime;
 306                 if (m_time_of_day_f > 1.0)
 307                         m_time_of_day_f -= 1.0;
 308                 if (m_time_of_day_f < 0.0)
 309                         m_time_of_day_f += 1.0;
 310         }
 311 }
 312
 313 u32 Environment::getDayCount()
 314 {
 315         // Atomic<u32> counter
 316         return m_day_count;
 317 }