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