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
  42 Environment::~Environment()
  43 {
  44 }
  45
  46 u32 Environment::getDayNightRatio()
  47 {
  48         MutexAutoLock lock(this->m_time_lock);
  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 /*
  88         Check if a node is pointable
  89 */
  90 inline static bool isPointableNode(const MapNode &n,
  91                             INodeDefManager *nodedef , bool liquids_pointable)
  92 {
  93         const ContentFeatures &features = nodedef->get(n);
  94         return features.pointable ||
  95                (liquids_pointable && features.isLiquid());
  96 }
  97
  98 void Environment::continueRaycast(RaycastState *state, PointedThing *result)
  99 {
 100         INodeDefManager *nodedef = getMap().getNodeDefManager();
 101         if (state->m_initialization_needed) {
 102                 // Add objects
 103                 if (state->m_objects_pointable) {
 104                         std::vector<PointedThing> found;
 105                         getSelectedActiveObjects(state->m_shootline, found);
 106                         for (std::vector<PointedThing>::iterator pointed = found.begin();
 107                                         pointed != found.end(); ++pointed) {
 108                                 state->m_found.push(*pointed);
 109                         }
 110                 }
 111                 // Set search range
 112                 core::aabbox3d<s16> maximal_exceed = nodedef->getSelectionBoxIntUnion();
 113                 state->m_search_range.MinEdge = -maximal_exceed.MaxEdge;
 114                 state->m_search_range.MaxEdge = -maximal_exceed.MinEdge;
 115                 // Setting is done
 116                 state->m_initialization_needed = false;
 117         }
 118
 119         // The index of the first pointed thing that was not returned
 120         // before. The last index which needs to be tested.
 121         s16 lastIndex = state->m_iterator.m_last_index;
 122         if (!state->m_found.empty()) {
 123                 lastIndex = state->m_iterator.getIndex(
 124                         floatToInt(state->m_found.top().intersection_point, BS));
 125         }
 126
 127         Map &map = getMap();
 128         // If a node is found, this is the center of the
 129         // first nodebox the shootline meets.
 130         v3f found_boxcenter(0, 0, 0);
 131         // The untested nodes are in this range.
 132         core::aabbox3d<s16> new_nodes;
 133         while (state->m_iterator.m_current_index <= lastIndex) {
 134                 // Test the nodes around the current node in search_range.
 135                 new_nodes = state->m_search_range;
 136                 new_nodes.MinEdge += state->m_iterator.m_current_node_pos;
 137                 new_nodes.MaxEdge += state->m_iterator.m_current_node_pos;
 138
 139                 // Only check new nodes
 140                 v3s16 delta = state->m_iterator.m_current_node_pos
 141                         - state->m_previous_node;
 142                 if (delta.X > 0) {
 143                         new_nodes.MinEdge.X = new_nodes.MaxEdge.X;
 144                 } else if (delta.X < 0) {
 145                         new_nodes.MaxEdge.X = new_nodes.MinEdge.X;
 146                 } else if (delta.Y > 0) {
 147                         new_nodes.MinEdge.Y = new_nodes.MaxEdge.Y;
 148                 } else if (delta.Y < 0) {
 149                         new_nodes.MaxEdge.Y = new_nodes.MinEdge.Y;
 150                 } else if (delta.Z > 0) {
 151                         new_nodes.MinEdge.Z = new_nodes.MaxEdge.Z;
 152                 } else if (delta.Z < 0) {
 153                         new_nodes.MaxEdge.Z = new_nodes.MinEdge.Z;
 154                 }
 155
 156                 // For each untested node
 157                 for (s16 x = new_nodes.MinEdge.X; x <= new_nodes.MaxEdge.X; x++)
 158                 for (s16 y = new_nodes.MinEdge.Y; y <= new_nodes.MaxEdge.Y; y++)
 159                 for (s16 z = new_nodes.MinEdge.Z; z <= new_nodes.MaxEdge.Z; z++) {
 160                         MapNode n;
 161                         v3s16 np(x, y, z);
 162                         bool is_valid_position;
 163
 164                         n = map.getNodeNoEx(np, &is_valid_position);
 165                         if (!(is_valid_position && isPointableNode(n, nodedef,
 166                                         state->m_liquids_pointable))) {
 167                                 continue;
 168                         }
 169
 170                         PointedThing result;
 171
 172                         std::vector<aabb3f> boxes;
 173                         n.getSelectionBoxes(nodedef, &boxes,
 174                                 n.getNeighbors(np, &map));
 175
 176                         // Is there a collision with a selection box?
 177                         bool is_colliding = false;
 178                         // Minimal distance of all collisions
 179                         float min_distance_sq = 10000000;
 180
 181                         v3f npf = intToFloat(np, BS);
 182                         for (std::vector<aabb3f>::const_iterator i = boxes.begin();
 183                                         i != boxes.end(); ++i) {
 184                                 // Get current collision box
 185                                 aabb3f box = *i;
 186                                 box.MinEdge += npf;
 187                                 box.MaxEdge += npf;
 188
 189                                 v3f intersection_point;
 190                                 v3s16 intersection_normal;
 191                                 if (!boxLineCollision(box, state->m_shootline.start,
 192                                                 state->m_shootline.getVector(), &intersection_point,
 193                                                 &intersection_normal))
 194                                         continue;
 195
 196                                 f32 distanceSq = (intersection_point
 197                                         - state->m_shootline.start).getLengthSQ();
 198                                 // If this is the nearest collision, save it
 199                                 if (min_distance_sq > distanceSq) {
 200                                         min_distance_sq = distanceSq;
 201                                         result.intersection_point = intersection_point;
 202                                         result.intersection_normal = intersection_normal;
 203                                         found_boxcenter = box.getCenter();
 204                                         is_colliding = true;
 205                                 }
 206                         }
 207                         // If there wasn't a collision, stop
 208                         if (!is_colliding) {
 209                                 continue;
 210                         }
 211                         result.type = POINTEDTHING_NODE;
 212                         result.node_undersurface = np;
 213                         result.distanceSq = min_distance_sq;
 214                         // Set undersurface and abovesurface nodes
 215                         f32 d = 0.002 * BS;
 216                         v3f fake_intersection = result.intersection_point;
 217                         // Move intersection towards its source block.
 218                         if (fake_intersection.X < found_boxcenter.X) {
 219                                 fake_intersection.X += d;
 220                         } else {
 221                                 fake_intersection.X -= d;
 222                         }
 223                         if (fake_intersection.Y < found_boxcenter.Y) {
 224                                 fake_intersection.Y += d;
 225                         } else {
 226                                 fake_intersection.Y -= d;
 227                         }
 228                         if (fake_intersection.Z < found_boxcenter.Z) {
 229                                 fake_intersection.Z += d;
 230                         } else {
 231                                 fake_intersection.Z -= d;
 232                         }
 233                         result.node_real_undersurface = floatToInt(
 234                                 fake_intersection, BS);
 235                         result.node_abovesurface = result.node_real_undersurface
 236                                 + result.intersection_normal;
 237                         // Push found PointedThing
 238                         state->m_found.push(result);
 239                         // If this is nearer than the old nearest object,
 240                         // the search can be shorter
 241                         s16 newIndex = state->m_iterator.getIndex(
 242                                 result.node_real_undersurface);
 243                         if (newIndex < lastIndex) {
 244                                 lastIndex = newIndex;
 245                         }
 246                 }
 247                 // Next node
 248                 state->m_previous_node = state->m_iterator.m_current_node_pos;
 249                 state->m_iterator.next();
 250         }
 251         // Return empty PointedThing if nothing left on the ray
 252         if (state->m_found.empty()) {
 253                 result->type = POINTEDTHING_NOTHING;
 254         } else {
 255                 *result = state->m_found.top();
 256                 state->m_found.pop();
 257         }
 258 }
 259
 260 void Environment::stepTimeOfDay(float dtime)
 261 {
 262         MutexAutoLock lock(this->m_time_lock);
 263
 264         // Cached in order to prevent the two reads we do to give
 265         // different results (can be written by code not under the lock)
 266         f32 cached_time_of_day_speed = m_time_of_day_speed;
 267
 268         f32 speed = cached_time_of_day_speed * 24000. / (24. * 3600);
 269         m_time_conversion_skew += dtime;
 270         u32 units = (u32)(m_time_conversion_skew * speed);
 271         bool sync_f = false;
 272         if (units > 0) {
 273                 // Sync at overflow
 274                 if (m_time_of_day + units >= 24000) {
 275                         sync_f = true;
 276                         ++m_day_count;
 277                 }
 278                 m_time_of_day = (m_time_of_day + units) % 24000;
 279                 if (sync_f)
 280                         m_time_of_day_f = (float)m_time_of_day / 24000.0;
 281         }
 282         if (speed > 0) {
 283                 m_time_conversion_skew -= (f32)units / speed;
 284         }
 285         if (!sync_f) {
 286                 m_time_of_day_f += cached_time_of_day_speed / 24 / 3600 * dtime;
 287                 if (m_time_of_day_f > 1.0)
 288                         m_time_of_day_f -= 1.0;
 289                 if (m_time_of_day_f < 0.0)
 290                         m_time_of_day_f += 1.0;
 291         }
 292 }
 293
 294 u32 Environment::getDayCount()
 295 {
 296         // Atomic<u32> counter
 297         return m_day_count;
 298 }