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