src/tool.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 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 "tool.h"
  21 #include "itemgroup.h"
  22 #include "log.h"
  23 #include "inventory.h"
  24 #include "exceptions.h"
  25 #include "util/serialize.h"
  26 #include "util/numeric.h"
  27
  28 void ToolCapabilities::serialize(std::ostream &os, u16 protocol_version) const
  29 {
  30         writeU8(os, 2); // version (protocol >= 18)
  31         writeF1000(os, full_punch_interval);
  32         writeS16(os, max_drop_level);
  33         writeU32(os, groupcaps.size());
  34         for (ToolGCMap::const_iterator i = groupcaps.begin(); i != groupcaps.end(); ++i) {
  35                 const std::string *name = &i->first;
  36                 const ToolGroupCap *cap = &i->second;
  37                 os << serializeString(*name);
  38                 writeS16(os, cap->uses);
  39                 writeS16(os, cap->maxlevel);
  40                 writeU32(os, cap->times.size());
  41                 for (std::unordered_map<int, float>::const_iterator
  42                                 j = cap->times.begin(); j != cap->times.end(); ++j) {
  43                         writeS16(os, j->first);
  44                         writeF1000(os, j->second);
  45                 }
  46         }
  47
  48         writeU32(os, damageGroups.size());
  49
  50         for (DamageGroup::const_iterator i = damageGroups.begin();
  51                         i != damageGroups.end(); ++i) {
  52                 os << serializeString(i->first);
  53                 writeS16(os, i->second);
  54         }
  55 }
  56
  57 void ToolCapabilities::deSerialize(std::istream &is)
  58 {
  59         int version = readU8(is);
  60         if(version != 1 && version != 2) throw SerializationError(
  61                         "unsupported ToolCapabilities version");
  62         full_punch_interval = readF1000(is);
  63         max_drop_level = readS16(is);
  64         groupcaps.clear();
  65         u32 groupcaps_size = readU32(is);
  66         for(u32 i=0; i<groupcaps_size; i++){
  67                 std::string name = deSerializeString(is);
  68                 ToolGroupCap cap;
  69                 cap.uses = readS16(is);
  70                 cap.maxlevel = readS16(is);
  71                 u32 times_size = readU32(is);
  72                 for(u32 i=0; i<times_size; i++){
  73                         int level = readS16(is);
  74                         float time = readF1000(is);
  75                         cap.times[level] = time;
  76                 }
  77                 groupcaps[name] = cap;
  78         }
  79         if(version == 2)
  80         {
  81                 u32 damage_groups_size = readU32(is);
  82                 for(u32 i=0; i<damage_groups_size; i++){
  83                         std::string name = deSerializeString(is);
  84                         s16 rating = readS16(is);
  85                         damageGroups[name] = rating;
  86                 }
  87         }
  88 }
  89
  90 DigParams getDigParams(const ItemGroupList &groups,
  91                 const ToolCapabilities *tp, float time_from_last_punch)
  92 {
  93         //infostream<<"getDigParams"<<std::endl;
  94         /* Check group dig_immediate */
  95         switch(itemgroup_get(groups, "dig_immediate")){
  96         case 2:
  97                 //infostream<<"dig_immediate=2"<<std::endl;
  98                 return DigParams(true, 0.5, 0, "dig_immediate");
  99         case 3:
 100                 //infostream<<"dig_immediate=3"<<std::endl;
 101                 return DigParams(true, 0, 0, "dig_immediate");
 102         default:
 103                 break;
 104         }
 105
 106         // Values to be returned (with a bit of conversion)
 107         bool result_diggable = false;
 108         float result_time = 0.0;
 109         float result_wear = 0.0;
 110         std::string result_main_group = "";
 111
 112         int level = itemgroup_get(groups, "level");
 113         //infostream<<"level="<<level<<std::endl;
 114         for (ToolGCMap::const_iterator i = tp->groupcaps.begin();
 115                         i != tp->groupcaps.end(); ++i) {
 116                 const std::string &name = i->first;
 117                 //infostream<<"group="<<name<<std::endl;
 118                 const ToolGroupCap &cap = i->second;
 119                 int rating = itemgroup_get(groups, name);
 120                 float time = 0;
 121                 bool time_exists = cap.getTime(rating, &time);
 122                 if(!result_diggable || time < result_time){
 123                         if(cap.maxlevel >= level && time_exists){
 124                                 result_diggable = true;
 125                                 int leveldiff = cap.maxlevel - level;
 126                                 result_time = time / MYMAX(1, leveldiff);
 127                                 if(cap.uses != 0)
 128                                         result_wear = 1.0 / cap.uses / pow(3.0, (double)leveldiff);
 129                                 else
 130                                         result_wear = 0;
 131                                 result_main_group = name;
 132                         }
 133                 }
 134         }
 135         //infostream<<"result_diggable="<<result_diggable<<std::endl;
 136         //infostream<<"result_time="<<result_time<<std::endl;
 137         //infostream<<"result_wear="<<result_wear<<std::endl;
 138
 139         if(time_from_last_punch < tp->full_punch_interval){
 140                 float f = time_from_last_punch / tp->full_punch_interval;
 141                 //infostream<<"f="<<f<<std::endl;
 142                 result_time /= f;
 143                 result_wear /= f;
 144         }
 145
 146         u16 wear_i = 65535.*result_wear;
 147         return DigParams(result_diggable, result_time, wear_i, result_main_group);
 148 }
 149
 150 DigParams getDigParams(const ItemGroupList &groups,
 151                 const ToolCapabilities *tp)
 152 {
 153         return getDigParams(groups, tp, 1000000);
 154 }
 155
 156 HitParams getHitParams(const ItemGroupList &armor_groups,
 157                 const ToolCapabilities *tp, float time_from_last_punch)
 158 {
 159         s16 damage = 0;
 160         float full_punch_interval = tp->full_punch_interval;
 161
 162         for (DamageGroup::const_iterator i = tp->damageGroups.begin();
 163                         i != tp->damageGroups.end(); ++i) {
 164                 s16 armor = itemgroup_get(armor_groups, i->first);
 165                 damage += i->second * rangelim(time_from_last_punch / full_punch_interval, 0.0, 1.0)
 166                                 * armor / 100.0;
 167         }
 168
 169         return HitParams(damage, 0);
 170 }
 171
 172 HitParams getHitParams(const ItemGroupList &armor_groups,
 173                 const ToolCapabilities *tp)
 174 {
 175         return getHitParams(armor_groups, tp, 1000000);
 176 }
 177
 178 PunchDamageResult getPunchDamage(
 179                 const ItemGroupList &armor_groups,
 180                 const ToolCapabilities *toolcap,
 181                 const ItemStack *punchitem,
 182                 float time_from_last_punch
 183 ){
 184         bool do_hit = true;
 185         {
 186                 if(do_hit && punchitem){
 187                         if(itemgroup_get(armor_groups, "punch_operable") &&
 188                                         (toolcap == NULL || punchitem->name == ""))
 189                                 do_hit = false;
 190                 }
 191                 if(do_hit){
 192                         if(itemgroup_get(armor_groups, "immortal"))
 193                                 do_hit = false;
 194                 }
 195         }
 196
 197         PunchDamageResult result;
 198         if(do_hit)
 199         {
 200                 HitParams hitparams = getHitParams(armor_groups, toolcap,
 201                                 time_from_last_punch);
 202                 result.did_punch = true;
 203                 result.wear = hitparams.wear;
 204                 result.damage = hitparams.hp;
 205         }
 206
 207         return result;
 208 }
 209
 210