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         m_cache_abm_time_budget = g_settings->getFloat("abm_time_budget");
  40
  41         m_time_of_day = g_settings->getU32("world_start_time");
  42         m_time_of_day_f = (float)m_time_of_day / 24000.0f;
  43 }
  44
  45 u32 Environment::getDayNightRatio()
  46 {
  47         MutexAutoLock lock(m_time_lock);
  48         if (m_enable_day_night_ratio_override)
  49                 return m_day_night_ratio_override;
  50         return time_to_daynight_ratio(m_time_of_day_f * 24000, m_cache_enable_shaders);
  51 }
  52
  53 void Environment::setTimeOfDaySpeed(float speed)
  54 {
  55         m_time_of_day_speed = speed;
  56 }
  57
  58 void Environment::setDayNightRatioOverride(bool enable, u32 value)
  59 {
  60         MutexAutoLock lock(m_time_lock);
  61         m_enable_day_night_ratio_override = enable;
  62         m_day_night_ratio_override = value;
  63 }
  64
  65 void Environment::setTimeOfDay(u32 time)
  66 {
  67         MutexAutoLock lock(m_time_lock);
  68         if (m_time_of_day > time)
  69                 ++m_day_count;
  70         m_time_of_day = time;
  71         m_time_of_day_f = (float)time / 24000.0;
  72 }
  73
  74 u32 Environment::getTimeOfDay()
  75 {
  76         MutexAutoLock lock(m_time_lock);
  77         return m_time_of_day;
  78 }
  79
  80 float Environment::getTimeOfDayF()
  81 {
  82         MutexAutoLock lock(m_time_lock);
  83         return m_time_of_day_f;
  84 }
  85
  86 bool Environment::line_of_sight(v3f pos1, v3f pos2, v3s16 *p)
  87 {
  88         // Iterate trough nodes on the line
  89         voxalgo::VoxelLineIterator iterator(pos1 / BS, (pos2 - pos1) / BS);
  90         do {
  91                 MapNode n = getMap().getNode(iterator.m_current_node_pos);
  92
  93                 // Return non-air
  94                 if (n.param0 != CONTENT_AIR) {
  95                         if (p)
  96                                 *p = iterator.m_current_node_pos;
  97                         return false;
  98                 }
  99                 iterator.next();
 100         } while (iterator.m_current_index <= iterator.m_last_index);
 101         return true;
 102 }
 103
 104 /*
 105         Check if a node is pointable
 106 */
 107 inline static bool isPointableNode(const MapNode &n,
 108         const NodeDefManager *nodedef , bool liquids_pointable)
 109 {
 110         const ContentFeatures &features = nodedef->get(n);
 111         return features.pointable ||
 112                (liquids_pointable && features.isLiquid());
 113 }
 114
 115 void Environment::continueRaycast(RaycastState *state, PointedThing *result)
 116 {
 117         const NodeDefManager *nodedef = getMap().getNodeDefManager();
 118         if (state->m_initialization_needed) {
 119                 // Add objects
 120                 if (state->m_objects_pointable) {
 121                         std::vector<PointedThing> found;
 122                         getSelectedActiveObjects(state->m_shootline, found);
 123                         for (const PointedThing &pointed : found) {
 124                                 state->m_found.push(pointed);
 125                         }
 126                 }
 127                 // Set search range
 128                 core::aabbox3d<s16> maximal_exceed = nodedef->getSelectionBoxIntUnion();
 129                 state->m_search_range.MinEdge = -maximal_exceed.MaxEdge;
 130                 state->m_search_range.MaxEdge = -maximal_exceed.MinEdge;
 131                 // Setting is done
 132                 state->m_initialization_needed = false;
 133         }
 134
 135         // The index of the first pointed thing that was not returned
 136         // before. The last index which needs to be tested.
 137         s16 lastIndex = state->m_iterator.m_last_index;
 138         if (!state->m_found.empty()) {
 139                 lastIndex = state->m_iterator.getIndex(
 140                         floatToInt(state->m_found.top().intersection_point, BS));
 141         }
 142
 143         Map &map = getMap();
 144         // If a node is found, this is the center of the
 145         // first nodebox the shootline meets.
 146         v3f found_boxcenter(0, 0, 0);
 147         // The untested nodes are in this range.
 148         core::aabbox3d<s16> new_nodes;
 149         while (state->m_iterator.m_current_index <= lastIndex) {
 150                 // Test the nodes around the current node in search_range.
 151                 new_nodes = state->m_search_range;
 152                 new_nodes.MinEdge += state->m_iterator.m_current_node_pos;
 153                 new_nodes.MaxEdge += state->m_iterator.m_current_node_pos;
 154
 155                 // Only check new nodes
 156                 v3s16 delta = state->m_iterator.m_current_node_pos
 157                         - state->m_previous_node;
 158                 if (delta.X > 0) {
 159                         new_nodes.MinEdge.X = new_nodes.MaxEdge.X;
 160                 } else if (delta.X < 0) {
 161                         new_nodes.MaxEdge.X = new_nodes.MinEdge.X;
 162                 } else if (delta.Y > 0) {
 163                         new_nodes.MinEdge.Y = new_nodes.MaxEdge.Y;
 164                 } else if (delta.Y < 0) {
 165                         new_nodes.MaxEdge.Y = new_nodes.MinEdge.Y;
 166                 } else if (delta.Z > 0) {
 167                         new_nodes.MinEdge.Z = new_nodes.MaxEdge.Z;
 168                 } else if (delta.Z < 0) {
 169                         new_nodes.MaxEdge.Z = new_nodes.MinEdge.Z;
 170                 }
 171
 172                 if (new_nodes.MaxEdge.X == S16_MAX ||
 173                         new_nodes.MaxEdge.Y == S16_MAX ||
 174                         new_nodes.MaxEdge.Z == S16_MAX) {
 175                         break; // About to go out of bounds
 176                 }
 177
 178                 // For each untested node
 179                 for (s16 x = new_nodes.MinEdge.X; x <= new_nodes.MaxEdge.X; x++)
 180                 for (s16 y = new_nodes.MinEdge.Y; y <= new_nodes.MaxEdge.Y; y++)
 181                 for (s16 z = new_nodes.MinEdge.Z; z <= new_nodes.MaxEdge.Z; z++) {
 182                         MapNode n;
 183                         v3s16 np(x, y, z);
 184                         bool is_valid_position;
 185
 186                         n = map.getNode(np, &is_valid_position);
 187                         if (!(is_valid_position && isPointableNode(n, nodedef,
 188                                         state->m_liquids_pointable))) {
 189                                 continue;
 190                         }
 191
 192                         PointedThing result;
 193
 194                         std::vector<aabb3f> boxes;
 195                         n.getSelectionBoxes(nodedef, &boxes,
 196                                 n.getNeighbors(np, &map));
 197
 198                         // Is there a collision with a selection box?
 199                         bool is_colliding = false;
 200                         // Minimal distance of all collisions
 201                         float min_distance_sq = 10000000;
 202                         // ID of the current box (loop counter)
 203                         u16 id = 0;
 204
 205                         // Do calculations relative to the node center
 206                         // to translate the ray rather than the boxes
 207                         v3f npf = intToFloat(np, BS);
 208                         v3f rel_start = state->m_shootline.start - npf;
 209                         for (aabb3f &box : boxes) {
 210                                 v3f intersection_point;
 211                                 v3f intersection_normal;
 212                                 if (!boxLineCollision(box, rel_start,
 213                                                 state->m_shootline.getVector(), &intersection_point,
 214                                                 &intersection_normal)) {
 215                                         ++id;
 216                                         continue;
 217                                 }
 218
 219                                 intersection_point += npf; // translate back to world coords
 220                                 f32 distanceSq = (intersection_point
 221                                         - state->m_shootline.start).getLengthSQ();
 222                                 // If this is the nearest collision, save it
 223                                 if (min_distance_sq > distanceSq) {
 224                                         min_distance_sq = distanceSq;
 225                                         result.intersection_point = intersection_point;
 226                                         result.intersection_normal = intersection_normal;
 227                                         result.box_id = id;
 228                                         found_boxcenter = box.getCenter();
 229                                         is_colliding = true;
 230                                 }
 231                                 ++id;
 232                         }
 233                         // If there wasn't a collision, stop
 234                         if (!is_colliding) {
 235                                 continue;
 236                         }
 237                         result.type = POINTEDTHING_NODE;
 238                         result.node_undersurface = np;
 239                         result.distanceSq = min_distance_sq;
 240                         // Set undersurface and abovesurface nodes
 241                         f32 d = 0.002 * BS;
 242                         v3f fake_intersection = result.intersection_point;
 243                         found_boxcenter += npf; // translate back to world coords
 244                         // Move intersection towards its source block.
 245                         if (fake_intersection.X < found_boxcenter.X) {
 246                                 fake_intersection.X += d;
 247                         } else {
 248                                 fake_intersection.X -= d;
 249                         }
 250                         if (fake_intersection.Y < found_boxcenter.Y) {
 251                                 fake_intersection.Y += d;
 252                         } else {
 253                                 fake_intersection.Y -= d;
 254                         }
 255                         if (fake_intersection.Z < found_boxcenter.Z) {
 256                                 fake_intersection.Z += d;
 257                         } else {
 258                                 fake_intersection.Z -= d;
 259                         }
 260                         result.node_real_undersurface = floatToInt(
 261                                 fake_intersection, BS);
 262                         result.node_abovesurface = result.node_real_undersurface
 263                                 + floatToInt(result.intersection_normal, 1.0f);
 264                         // Push found PointedThing
 265                         state->m_found.push(result);
 266                         // If this is nearer than the old nearest object,
 267                         // the search can be shorter
 268                         s16 newIndex = state->m_iterator.getIndex(
 269                                 result.node_real_undersurface);
 270                         if (newIndex < lastIndex) {
 271                                 lastIndex = newIndex;
 272                         }
 273                 }
 274                 // Next node
 275                 state->m_previous_node = state->m_iterator.m_current_node_pos;
 276                 state->m_iterator.next();
 277         }
 278         // Return empty PointedThing if nothing left on the ray
 279         if (state->m_found.empty()) {
 280                 result->type = POINTEDTHING_NOTHING;
 281         } else {
 282                 *result = state->m_found.top();
 283                 state->m_found.pop();
 284         }
 285 }
 286
 287 void Environment::stepTimeOfDay(float dtime)
 288 {
 289         MutexAutoLock lock(this->m_time_lock);
 290
 291         // Cached in order to prevent the two reads we do to give
 292         // different results (can be written by code not under the lock)
 293         f32 cached_time_of_day_speed = m_time_of_day_speed;
 294
 295         f32 speed = cached_time_of_day_speed * 24000. / (24. * 3600);
 296         m_time_conversion_skew += dtime;
 297         u32 units = (u32)(m_time_conversion_skew * speed);
 298         bool sync_f = false;
 299         if (units > 0) {
 300                 // Sync at overflow
 301                 if (m_time_of_day + units >= 24000) {
 302                         sync_f = true;
 303                         ++m_day_count;
 304                 }
 305                 m_time_of_day = (m_time_of_day + units) % 24000;
 306                 if (sync_f)
 307                         m_time_of_day_f = (float)m_time_of_day / 24000.0;
 308         }
 309         if (speed > 0) {
 310                 m_time_conversion_skew -= (f32)units / speed;
 311         }
 312         if (!sync_f) {
 313                 m_time_of_day_f += cached_time_of_day_speed / 24 / 3600 * dtime;
 314                 if (m_time_of_day_f > 1.0)
 315                         m_time_of_day_f -= 1.0;
 316                 if (m_time_of_day_f < 0.0)
 317                         m_time_of_day_f += 1.0;
 318         }
 319 }
 320
 321 u32 Environment::getDayCount()
 322 {
 323         // Atomic<u32> counter
 324         return m_day_count;
 325 }