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 (g_settings->getBool("no_night"))
  48                 return time_to_daynight_ratio(12000, m_cache_enable_shaders);
  49         if (m_enable_day_night_ratio_override)
  50                 return m_day_night_ratio_override;
  51         return time_to_daynight_ratio(m_time_of_day_f * 24000, m_cache_enable_shaders);
  52 }
  53
  54 void Environment::setTimeOfDaySpeed(float speed)
  55 {
  56         m_time_of_day_speed = speed;
  57 }
  58
  59 void Environment::setDayNightRatioOverride(bool enable, u32 value)
  60 {
  61         MutexAutoLock lock(this->m_time_lock);
  62         m_enable_day_night_ratio_override = enable;
  63         m_day_night_ratio_override = value;
  64 }
  65
  66 void Environment::setTimeOfDay(u32 time)
  67 {
  68         MutexAutoLock lock(this->m_time_lock);
  69         if (m_time_of_day > time)
  70                 ++m_day_count;
  71         m_time_of_day = time;
  72         m_time_of_day_f = (float)time / 24000.0;
  73 }
  74
  75 u32 Environment::getTimeOfDay()
  76 {
  77         MutexAutoLock lock(this->m_time_lock);
  78         return m_time_of_day;
  79 }
  80
  81 float Environment::getTimeOfDayF()
  82 {
  83         MutexAutoLock lock(this->m_time_lock);
  84         return m_time_of_day_f;
  85 }
  86
  87 bool Environment::line_of_sight(v3f pos1, v3f pos2, v3s16 *p)
  88 {
  89         // Iterate trough nodes on the line
  90         voxalgo::VoxelLineIterator iterator(pos1 / BS, (pos2 - pos1) / BS);
  91         do {
  92                 MapNode n = getMap().getNode(iterator.m_current_node_pos);
  93
  94                 // Return non-air
  95                 if (n.param0 != CONTENT_AIR) {
  96                         if (p)
  97                                 *p = iterator.m_current_node_pos;
  98                         return false;
  99                 }
 100                 iterator.next();
 101         } while (iterator.m_current_index <= iterator.m_last_index);
 102         return true;
 103 }
 104
 105 /*
 106         Check if a node is pointable
 107 */
 108 inline static bool isPointableNode(const MapNode &n,
 109         const NodeDefManager *nodedef , bool liquids_pointable, bool nodes_pointable)
 110 {
 111         if (! nodes_pointable)
 112                 return false;
 113         const ContentFeatures &features = nodedef->get(n);
 114         return features.pointable ||
 115                ((liquids_pointable || g_settings->getBool("point_liquids")) && features.isLiquid());
 116 }
 117
 118 void Environment::continueRaycast(RaycastState *state, PointedThing *result)
 119 {
 120         const NodeDefManager *nodedef = getMap().getNodeDefManager();
 121         if (state->m_initialization_needed) {
 122                 // Add objects
 123                 if (state->m_objects_pointable) {
 124                         std::vector<PointedThing> found;
 125                         getSelectedActiveObjects(state->m_shootline, found);
 126                         for (const PointedThing &pointed : found) {
 127                                 state->m_found.push(pointed);
 128                         }
 129                 }
 130                 // Set search range
 131                 core::aabbox3d<s16> maximal_exceed = nodedef->getSelectionBoxIntUnion();
 132                 state->m_search_range.MinEdge = -maximal_exceed.MaxEdge;
 133                 state->m_search_range.MaxEdge = -maximal_exceed.MinEdge;
 134                 // Setting is done
 135                 state->m_initialization_needed = false;
 136         }
 137
 138         // The index of the first pointed thing that was not returned
 139         // before. The last index which needs to be tested.
 140         s16 lastIndex = state->m_iterator.m_last_index;
 141         if (!state->m_found.empty()) {
 142                 lastIndex = state->m_iterator.getIndex(
 143                         floatToInt(state->m_found.top().intersection_point, BS));
 144         }
 145
 146         Map &map = getMap();
 147         // If a node is found, this is the center of the
 148         // first nodebox the shootline meets.
 149         v3f found_boxcenter(0, 0, 0);
 150         // The untested nodes are in this range.
 151         core::aabbox3d<s16> new_nodes;
 152         while (state->m_iterator.m_current_index <= lastIndex) {
 153                 // Test the nodes around the current node in search_range.
 154                 new_nodes = state->m_search_range;
 155                 new_nodes.MinEdge += state->m_iterator.m_current_node_pos;
 156                 new_nodes.MaxEdge += state->m_iterator.m_current_node_pos;
 157
 158                 // Only check new nodes
 159                 v3s16 delta = state->m_iterator.m_current_node_pos
 160                         - state->m_previous_node;
 161                 if (delta.X > 0) {
 162                         new_nodes.MinEdge.X = new_nodes.MaxEdge.X;
 163                 } else if (delta.X < 0) {
 164                         new_nodes.MaxEdge.X = new_nodes.MinEdge.X;
 165                 } else if (delta.Y > 0) {
 166                         new_nodes.MinEdge.Y = new_nodes.MaxEdge.Y;
 167                 } else if (delta.Y < 0) {
 168                         new_nodes.MaxEdge.Y = new_nodes.MinEdge.Y;
 169                 } else if (delta.Z > 0) {
 170                         new_nodes.MinEdge.Z = new_nodes.MaxEdge.Z;
 171                 } else if (delta.Z < 0) {
 172                         new_nodes.MaxEdge.Z = new_nodes.MinEdge.Z;
 173                 }
 174
 175                 // For each untested node
 176                 for (s16 x = new_nodes.MinEdge.X; x <= new_nodes.MaxEdge.X; x++)
 177                 for (s16 y = new_nodes.MinEdge.Y; y <= new_nodes.MaxEdge.Y; y++)
 178                 for (s16 z = new_nodes.MinEdge.Z; z <= new_nodes.MaxEdge.Z; z++) {
 179                         MapNode n;
 180                         v3s16 np(x, y, z);
 181                         bool is_valid_position;
 182
 183                         n = map.getNode(np, &is_valid_position);
 184                         if (!(is_valid_position && isPointableNode(n, nodedef,
 185                                         state->m_liquids_pointable, state->m_nodes_pointable))) {
 186                                 continue;
 187                         }
 188
 189                         PointedThing result;
 190
 191                         std::vector<aabb3f> boxes;
 192                         n.getSelectionBoxes(nodedef, &boxes,
 193                                 n.getNeighbors(np, &map));
 194
 195                         // Is there a collision with a selection box?
 196                         bool is_colliding = false;
 197                         // Minimal distance of all collisions
 198                         float min_distance_sq = 10000000;
 199                         // ID of the current box (loop counter)
 200                         u16 id = 0;
 201
 202                         v3f npf = intToFloat(np, BS);
 203                         // This loop translates the boxes to their in-world place.
 204                         for (aabb3f &box : boxes) {
 205                                 box.MinEdge += npf;
 206                                 box.MaxEdge += npf;
 207
 208                                 v3f intersection_point;
 209                                 v3s16 intersection_normal;
 210                                 if (!boxLineCollision(box, state->m_shootline.start,
 211                                                 state->m_shootline.getVector(), &intersection_point,
 212                                                 &intersection_normal)) {
 213                                         ++id;
 214                                         continue;
 215                                 }
 216
 217                                 f32 distanceSq = (intersection_point
 218                                         - state->m_shootline.start).getLengthSQ();
 219                                 // If this is the nearest collision, save it
 220                                 if (min_distance_sq > distanceSq) {
 221                                         min_distance_sq = distanceSq;
 222                                         result.intersection_point = intersection_point;
 223                                         result.intersection_normal = intersection_normal;
 224                                         result.box_id = id;
 225                                         found_boxcenter = box.getCenter();
 226                                         is_colliding = true;
 227                                 }
 228                                 ++id;
 229                         }
 230                         // If there wasn't a collision, stop
 231                         if (!is_colliding) {
 232                                 continue;
 233                         }
 234                         result.type = POINTEDTHING_NODE;
 235                         result.node_undersurface = np;
 236                         result.distanceSq = min_distance_sq;
 237                         // Set undersurface and abovesurface nodes
 238                         f32 d = 0.002 * BS;
 239                         v3f fake_intersection = result.intersection_point;
 240                         // Move intersection towards its source block.
 241                         if (fake_intersection.X < found_boxcenter.X) {
 242                                 fake_intersection.X += d;
 243                         } else {
 244                                 fake_intersection.X -= d;
 245                         }
 246                         if (fake_intersection.Y < found_boxcenter.Y) {
 247                                 fake_intersection.Y += d;
 248                         } else {
 249                                 fake_intersection.Y -= d;
 250                         }
 251                         if (fake_intersection.Z < found_boxcenter.Z) {
 252                                 fake_intersection.Z += d;
 253                         } else {
 254                                 fake_intersection.Z -= d;
 255                         }
 256                         result.node_real_undersurface = floatToInt(
 257                                 fake_intersection, BS);
 258                         result.node_abovesurface = result.node_real_undersurface
 259                                 + result.intersection_normal;
 260                         // Push found PointedThing
 261                         state->m_found.push(result);
 262                         // If this is nearer than the old nearest object,
 263                         // the search can be shorter
 264                         s16 newIndex = state->m_iterator.getIndex(
 265                                 result.node_real_undersurface);
 266                         if (newIndex < lastIndex) {
 267                                 lastIndex = newIndex;
 268                         }
 269                 }
 270                 // Next node
 271                 state->m_previous_node = state->m_iterator.m_current_node_pos;
 272                 state->m_iterator.next();
 273         }
 274         // Return empty PointedThing if nothing left on the ray
 275         if (state->m_found.empty()) {
 276                 result->type = POINTEDTHING_NOTHING;
 277         } else {
 278                 *result = state->m_found.top();
 279                 state->m_found.pop();
 280         }
 281 }
 282
 283 void Environment::stepTimeOfDay(float dtime)
 284 {
 285         MutexAutoLock lock(this->m_time_lock);
 286
 287         // Cached in order to prevent the two reads we do to give
 288         // different results (can be written by code not under the lock)
 289         f32 cached_time_of_day_speed = m_time_of_day_speed;
 290
 291         f32 speed = cached_time_of_day_speed * 24000. / (24. * 3600);
 292         m_time_conversion_skew += dtime;
 293         u32 units = (u32)(m_time_conversion_skew * speed);
 294         bool sync_f = false;
 295         if (units > 0) {
 296                 // Sync at overflow
 297                 if (m_time_of_day + units >= 24000) {
 298                         sync_f = true;
 299                         ++m_day_count;
 300                 }
 301                 m_time_of_day = (m_time_of_day + units) % 24000;
 302                 if (sync_f)
 303                         m_time_of_day_f = (float)m_time_of_day / 24000.0;
 304         }
 305         if (speed > 0) {
 306                 m_time_conversion_skew -= (f32)units / speed;
 307         }
 308         if (!sync_f) {
 309                 m_time_of_day_f += cached_time_of_day_speed / 24 / 3600 * dtime;
 310                 if (m_time_of_day_f > 1.0)
 311                         m_time_of_day_f -= 1.0;
 312                 if (m_time_of_day_f < 0.0)
 313                         m_time_of_day_f += 1.0;
 314         }
 315 }
 316
 317 u32 Environment::getDayCount()
 318 {
 319         // Atomic<u32> counter
 320         return m_day_count;
 321 }