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         if(protocol_version <= 17)
  31                 writeU8(os, 1); // version
  32         else
  33                 writeU8(os, 2); // version
  34         writeF1000(os, full_punch_interval);
  35         writeS16(os, max_drop_level);
  36         writeU32(os, groupcaps.size());
  37         for(std::map<std::string, ToolGroupCap>::const_iterator
  38                         i = groupcaps.begin(); i != groupcaps.end(); i++){
  39                 const std::string *name = &i->first;
  40                 const ToolGroupCap *cap = &i->second;
  41                 os<<serializeString(*name);
  42                 writeS16(os, cap->uses);
  43                 writeS16(os, cap->maxlevel);
  44                 writeU32(os, cap->times.size());
  45                 for(std::map<int, float>::const_iterator
  46                                 i = cap->times.begin(); i != cap->times.end(); i++){
  47                         writeS16(os, i->first);
  48                         writeF1000(os, i->second);
  49                 }
  50         }
  51         if(protocol_version > 17){
  52                 writeU32(os, damageGroups.size());
  53                 for(std::map<std::string, s16>::const_iterator
  54                                 i = damageGroups.begin(); i != damageGroups.end(); i++){
  55                         os<<serializeString(i->first);
  56                         writeS16(os, i->second);
  57                 }
  58         }
  59 }
  60
  61 void ToolCapabilities::deSerialize(std::istream &is)
  62 {
  63         int version = readU8(is);
  64         if(version != 1 && version != 2) throw SerializationError(
  65                         "unsupported ToolCapabilities version");
  66         full_punch_interval = readF1000(is);
  67         max_drop_level = readS16(is);
  68         groupcaps.clear();
  69         u32 groupcaps_size = readU32(is);
  70         for(u32 i=0; i<groupcaps_size; i++){
  71                 std::string name = deSerializeString(is);
  72                 ToolGroupCap cap;
  73                 cap.uses = readS16(is);
  74                 cap.maxlevel = readS16(is);
  75                 u32 times_size = readU32(is);
  76                 for(u32 i=0; i<times_size; i++){
  77                         int level = readS16(is);
  78                         float time = readF1000(is);
  79                         cap.times[level] = time;
  80                 }
  81                 groupcaps[name] = cap;
  82         }
  83         if(version == 2)
  84         {
  85                 u32 damage_groups_size = readU32(is);
  86                 for(u32 i=0; i<damage_groups_size; i++){
  87                         std::string name = deSerializeString(is);
  88                         s16 rating = readS16(is);
  89                         damageGroups[name] = rating;
  90                 }
  91         }
  92 }
  93
  94 DigParams getDigParams(const ItemGroupList &groups,
  95                 const ToolCapabilities *tp, float time_from_last_punch)
  96 {
  97         //infostream<<"getDigParams"<<std::endl;
  98         /* Check group dig_immediate */
  99         switch(itemgroup_get(groups, "dig_immediate")){
 100         case 2:
 101                 //infostream<<"dig_immediate=2"<<std::endl;
 102                 return DigParams(true, 0.5, 0, "dig_immediate");
 103         case 3:
 104                 //infostream<<"dig_immediate=3"<<std::endl;
 105                 return DigParams(true, 0.0, 0, "dig_immediate");
 106         default:
 107                 break;
 108         }
 109
 110         // Values to be returned (with a bit of conversion)
 111         bool result_diggable = false;
 112         float result_time = 0.0;
 113         float result_wear = 0.0;
 114         std::string result_main_group = "";
 115
 116         int level = itemgroup_get(groups, "level");
 117         //infostream<<"level="<<level<<std::endl;
 118         for(std::map<std::string, ToolGroupCap>::const_iterator
 119                         i = tp->groupcaps.begin(); i != tp->groupcaps.end(); i++){
 120                 const std::string &name = i->first;
 121                 //infostream<<"group="<<name<<std::endl;
 122                 const ToolGroupCap &cap = i->second;
 123                 int rating = itemgroup_get(groups, name);
 124                 float time = 0;
 125                 bool time_exists = cap.getTime(rating, &time);
 126                 if(!result_diggable || time < result_time){
 127                         if(cap.maxlevel >= level && time_exists){
 128                                 result_diggable = true;
 129                                 int leveldiff = cap.maxlevel - level;
 130                                 result_time = time / MYMAX(1, leveldiff);
 131                                 if(cap.uses != 0)
 132                                         result_wear = 1.0 / cap.uses / pow(3.0, (double)leveldiff);
 133                                 else
 134                                         result_wear = 0;
 135                                 result_main_group = name;
 136                         }
 137                 }
 138         }
 139         //infostream<<"result_diggable="<<result_diggable<<std::endl;
 140         //infostream<<"result_time="<<result_time<<std::endl;
 141         //infostream<<"result_wear="<<result_wear<<std::endl;
 142
 143         if(time_from_last_punch < tp->full_punch_interval){
 144                 float f = time_from_last_punch / tp->full_punch_interval;
 145                 //infostream<<"f="<<f<<std::endl;
 146                 result_time /= f;
 147                 result_wear /= f;
 148         }
 149
 150         u16 wear_i = 65535.*result_wear;
 151         return DigParams(result_diggable, result_time, wear_i, result_main_group);
 152 }
 153
 154 DigParams getDigParams(const ItemGroupList &groups,
 155                 const ToolCapabilities *tp)
 156 {
 157         return getDigParams(groups, tp, 1000000);
 158 }
 159
 160 HitParams getHitParams(const ItemGroupList &armor_groups,
 161                 const ToolCapabilities *tp, float time_from_last_punch)
 162 {
 163         s16 damage = 0;
 164         float full_punch_interval = tp->full_punch_interval;
 165
 166         for(std::map<std::string, s16>::const_iterator
 167                         i = tp->damageGroups.begin(); i != tp->damageGroups.end(); i++){
 168                 s16 armor = itemgroup_get(armor_groups, i->first);
 169                 damage += i->second * rangelim(time_from_last_punch * full_punch_interval, 0.0, 1.0)
 170                                 * armor / 100.0;
 171         }
 172
 173         return HitParams(damage, 0);
 174 }
 175
 176 HitParams getHitParams(const ItemGroupList &armor_groups,
 177                 const ToolCapabilities *tp)
 178 {
 179         return getHitParams(armor_groups, tp, 1000000);
 180 }
 181
 182 PunchDamageResult getPunchDamage(
 183                 const ItemGroupList &armor_groups,
 184                 const ToolCapabilities *toolcap,
 185                 const ItemStack *punchitem,
 186                 float time_from_last_punch
 187 ){
 188         bool do_hit = true;
 189         {
 190                 if(do_hit && punchitem){
 191                         if(itemgroup_get(armor_groups, "punch_operable") &&
 192                                         (toolcap == NULL || punchitem->name == ""))
 193                                 do_hit = false;
 194                 }
 195                 if(do_hit){
 196                         if(itemgroup_get(armor_groups, "immortal"))
 197                                 do_hit = false;
 198                 }
 199         }
 200
 201         PunchDamageResult result;
 202         if(do_hit)
 203         {
 204                 HitParams hitparams = getHitParams(armor_groups, toolcap,
 205                                 time_from_last_punch);
 206                 result.did_punch = true;
 207                 result.wear = hitparams.wear;
 208                 result.damage = hitparams.hp;
 209         }
 210
 211         return result;
 212 }
 213
 214