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