src/tool.cpp

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2011 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 General Public License as published by
   7 the Free Software Foundation; either version 2 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 General Public License for more details.
  14
  15 You should have received a copy of the GNU 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 "utility.h"
  22 #include "itemdef.h" // For itemgroup_get()
  23 #include "log.h"
  24 #include "inventory.h"
  25
  26 void ToolCapabilities::serialize(std::ostream &os) const
  27 {
  28         writeU8(os, 1); // version
  29         writeF1000(os, full_punch_interval);
  30         writeS16(os, max_drop_level);
  31         writeU32(os, groupcaps.size());
  32         for(std::map<std::string, ToolGroupCap>::const_iterator
  33                         i = groupcaps.begin(); i != groupcaps.end(); i++){
  34                 const std::string *name = &i->first;
  35                 const ToolGroupCap *cap = &i->second;
  36                 os<<serializeString(*name);
  37                 writeS16(os, cap->uses);
  38                 writeS16(os, cap->maxlevel);
  39                 writeU32(os, cap->times.size());
  40                 for(std::map<int, float>::const_iterator
  41                                 i = cap->times.begin(); i != cap->times.end(); i++){
  42                         writeS16(os, i->first);
  43                         writeF1000(os, i->second);
  44                 }
  45         }
  46 }
  47
  48 void ToolCapabilities::deSerialize(std::istream &is)
  49 {
  50         int version = readU8(is);
  51         if(version != 1) throw SerializationError(
  52                         "unsupported ToolCapabilities version");
  53         full_punch_interval = readF1000(is);
  54         max_drop_level = readS16(is);
  55         groupcaps.clear();
  56         u32 groupcaps_size = readU32(is);
  57         for(u32 i=0; i<groupcaps_size; i++){
  58                 std::string name = deSerializeString(is);
  59                 ToolGroupCap cap;
  60                 cap.uses = readS16(is);
  61                 cap.maxlevel = readS16(is);
  62                 u32 times_size = readU32(is);
  63                 for(u32 i=0; i<times_size; i++){
  64                         int level = readS16(is);
  65                         float time = readF1000(is);
  66                         cap.times[level] = time;
  67                 }
  68                 groupcaps[name] = cap;
  69         }
  70 }
  71
  72 DigParams getDigParams(const ItemGroupList &groups,
  73                 const ToolCapabilities *tp, float time_from_last_punch)
  74 {
  75         //infostream<<"getDigParams"<<std::endl;
  76         /* Check group dig_immediate */
  77         switch(itemgroup_get(groups, "dig_immediate")){
  78         case 2:
  79                 //infostream<<"dig_immediate=2"<<std::endl;
  80                 return DigParams(true, 0.5, 0, "dig_immediate");
  81         case 3:
  82                 //infostream<<"dig_immediate=3"<<std::endl;
  83                 return DigParams(true, 0.0, 0, "dig_immediate");
  84         default:
  85                 break;
  86         }
  87
  88         // Values to be returned (with a bit of conversion)
  89         bool result_diggable = false;
  90         float result_time = 0.0;
  91         float result_wear = 0.0;
  92         std::string result_main_group = "";
  93
  94         int level = itemgroup_get(groups, "level");
  95         //infostream<<"level="<<level<<std::endl;
  96         for(std::map<std::string, ToolGroupCap>::const_iterator
  97                         i = tp->groupcaps.begin(); i != tp->groupcaps.end(); i++){
  98                 const std::string &name = i->first;
  99                 //infostream<<"group="<<name<<std::endl;
 100                 const ToolGroupCap &cap = i->second;
 101                 int rating = itemgroup_get(groups, name);
 102                 float time = 0;
 103                 bool time_exists = cap.getTime(rating, &time);
 104                 if(!result_diggable || time < result_time){
 105                         if(cap.maxlevel >= level && time_exists){
 106                                 result_diggable = true;
 107                                 int leveldiff = cap.maxlevel - level;
 108                                 result_time = time / MYMAX(1, leveldiff);
 109                                 if(cap.uses != 0)
 110                                         result_wear = 1.0 / cap.uses / pow(3.0, (double)leveldiff);
 111                                 else
 112                                         result_wear = 0;
 113                                 result_main_group = name;
 114                         }
 115                 }
 116         }
 117         //infostream<<"result_diggable="<<result_diggable<<std::endl;
 118         //infostream<<"result_time="<<result_time<<std::endl;
 119         //infostream<<"result_wear="<<result_wear<<std::endl;
 120
 121         if(time_from_last_punch < tp->full_punch_interval){
 122                 float f = time_from_last_punch / tp->full_punch_interval;
 123                 //infostream<<"f="<<f<<std::endl;
 124                 result_time /= f;
 125                 result_wear /= f;
 126         }
 127
 128         u16 wear_i = 65535.*result_wear;
 129         return DigParams(result_diggable, result_time, wear_i, result_main_group);
 130 }
 131
 132 DigParams getDigParams(const ItemGroupList &groups,
 133                 const ToolCapabilities *tp)
 134 {
 135         return getDigParams(groups, tp, 1000000);
 136 }
 137
 138 HitParams getHitParams(const ItemGroupList &groups,
 139                 const ToolCapabilities *tp, float time_from_last_punch)
 140 {
 141         DigParams digprop = getDigParams(groups, tp,
 142                         time_from_last_punch);
 143
 144         if(time_from_last_punch > tp->full_punch_interval)
 145                 time_from_last_punch = tp->full_punch_interval;
 146         // Damage in hp is equivalent to nodes dug in time_from_last_punch
 147         s16 hp = 0;
 148         if(digprop.diggable)
 149                 hp = time_from_last_punch / digprop.time;
 150         // Wear is the same as for digging a single node
 151         s16 wear = (float)digprop.wear;
 152
 153         return HitParams(hp, wear, digprop.main_group);
 154 }
 155
 156 HitParams getHitParams(const ItemGroupList &groups,
 157                 const ToolCapabilities *tp)
 158 {
 159         return getHitParams(groups, tp, 1000000);
 160 }
 161
 162 PunchDamageResult getPunchDamage(
 163                 const ItemGroupList &armor_groups,
 164                 const ToolCapabilities *toolcap,
 165                 const ItemStack *punchitem,
 166                 float time_from_last_punch
 167 ){
 168         bool do_hit = true;
 169         {
 170                 if(do_hit && punchitem){
 171                         if(itemgroup_get(armor_groups, "punch_operable") &&
 172                                         (toolcap == NULL || punchitem->name == ""))
 173                                 do_hit = false;
 174                 }
 175                 if(do_hit){
 176                         if(itemgroup_get(armor_groups, "immortal"))
 177                                 do_hit = false;
 178                 }
 179         }
 180
 181         PunchDamageResult result;
 182         if(do_hit)
 183         {
 184                 HitParams hitparams = getHitParams(armor_groups, toolcap,
 185                                 time_from_last_punch);
 186                 result.did_punch = true;
 187                 result.wear = hitparams.wear;
 188                 result.damage = hitparams.hp;
 189                 result.main_group = hitparams.main_group;
 190         }
 191
 192         return result;
 193 }
 194
 195