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, u16 protocol_version) const
  28 {
  29         if(protocol_version <= 17)
  30                 writeU8(os, 1); // version
  31         else
  32                 writeU8(os, 2); // version
  33         writeF1000(os, full_punch_interval);
  34         writeS16(os, max_drop_level);
  35         writeU32(os, groupcaps.size());
  36         for(std::map<std::string, ToolGroupCap>::const_iterator
  37                         i = groupcaps.begin(); i != groupcaps.end(); i++){
  38                 const std::string *name = &i->first;
  39                 const ToolGroupCap *cap = &i->second;
  40                 os<<serializeString(*name);
  41                 writeS16(os, cap->uses);
  42                 writeS16(os, cap->maxlevel);
  43                 writeU32(os, cap->times.size());
  44                 for(std::map<int, float>::const_iterator
  45                                 i = cap->times.begin(); i != cap->times.end(); i++){
  46                         writeS16(os, i->first);
  47                         writeF1000(os, i->second);
  48                 }
  49         }
  50         if(protocol_version > 17){
  51                 writeU32(os, damageGroups.size());
  52                 for(std::map<std::string, s16>::const_iterator
  53                                 i = damageGroups.begin(); i != damageGroups.end(); i++){
  54                         os<<serializeString(i->first);
  55                         writeS16(os, i->second);
  56                 }
  57         }
  58 }
  59
  60 void ToolCapabilities::deSerialize(std::istream &is)
  61 {
  62         int version = readU8(is);
  63         if(version != 1 && version != 2) throw SerializationError(
  64                         "unsupported ToolCapabilities version");
  65         full_punch_interval = readF1000(is);
  66         max_drop_level = readS16(is);
  67         groupcaps.clear();
  68         u32 groupcaps_size = readU32(is);
  69         for(u32 i=0; i<groupcaps_size; i++){
  70                 std::string name = deSerializeString(is);
  71                 ToolGroupCap cap;
  72                 cap.uses = readS16(is);
  73                 cap.maxlevel = readS16(is);
  74                 u32 times_size = readU32(is);
  75                 for(u32 i=0; i<times_size; i++){
  76                         int level = readS16(is);
  77                         float time = readF1000(is);
  78                         cap.times[level] = time;
  79                 }
  80                 groupcaps[name] = cap;
  81         }
  82         if(version == 2)
  83         {
  84                 u32 damage_groups_size = readU32(is);
  85                 for(u32 i=0; i<damage_groups_size; i++){
  86                         std::string name = deSerializeString(is);
  87                         s16 rating = readS16(is);
  88                         damageGroups[name] = rating;
  89                 }
  90         }
  91 }
  92
  93 DigParams getDigParams(const ItemGroupList &groups,
  94                 const ToolCapabilities *tp, float time_from_last_punch)
  95 {
  96         //infostream<<"getDigParams"<<std::endl;
  97         /* Check group dig_immediate */
  98         switch(itemgroup_get(groups, "dig_immediate")){
  99         case 2:
 100                 //infostream<<"dig_immediate=2"<<std::endl;
 101                 return DigParams(true, 0.5, 0, "dig_immediate");
 102         case 3:
 103                 //infostream<<"dig_immediate=3"<<std::endl;
 104                 return DigParams(true, 0.0, 0, "dig_immediate");
 105         default:
 106                 break;
 107         }
 108
 109         // Values to be returned (with a bit of conversion)
 110         bool result_diggable = false;
 111         float result_time = 0.0;
 112         float result_wear = 0.0;
 113         std::string result_main_group = "";
 114
 115         int level = itemgroup_get(groups, "level");
 116         //infostream<<"level="<<level<<std::endl;
 117         for(std::map<std::string, ToolGroupCap>::const_iterator
 118                         i = tp->groupcaps.begin(); i != tp->groupcaps.end(); i++){
 119                 const std::string &name = i->first;
 120                 //infostream<<"group="<<name<<std::endl;
 121                 const ToolGroupCap &cap = i->second;
 122                 int rating = itemgroup_get(groups, name);
 123                 float time = 0;
 124                 bool time_exists = cap.getTime(rating, &time);
 125                 if(!result_diggable || time < result_time){
 126                         if(cap.maxlevel >= level && time_exists){
 127                                 result_diggable = true;
 128                                 int leveldiff = cap.maxlevel - level;
 129                                 result_time = time / MYMAX(1, leveldiff);
 130                                 if(cap.uses != 0)
 131                                         result_wear = 1.0 / cap.uses / pow(3.0, (double)leveldiff);
 132                                 else
 133                                         result_wear = 0;
 134                                 result_main_group = name;
 135                         }
 136                 }
 137         }
 138         //infostream<<"result_diggable="<<result_diggable<<std::endl;
 139         //infostream<<"result_time="<<result_time<<std::endl;
 140         //infostream<<"result_wear="<<result_wear<<std::endl;
 141
 142         if(time_from_last_punch < tp->full_punch_interval){
 143                 float f = time_from_last_punch / tp->full_punch_interval;
 144                 //infostream<<"f="<<f<<std::endl;
 145                 result_time /= f;
 146                 result_wear /= f;
 147         }
 148
 149         u16 wear_i = 65535.*result_wear;
 150         return DigParams(result_diggable, result_time, wear_i, result_main_group);
 151 }
 152
 153 DigParams getDigParams(const ItemGroupList &groups,
 154                 const ToolCapabilities *tp)
 155 {
 156         return getDigParams(groups, tp, 1000000);
 157 }
 158
 159 HitParams getHitParams(const ItemGroupList &armor_groups,
 160                 const ToolCapabilities *tp, float time_from_last_punch)
 161 {
 162         s16 damage = 0;
 163         float full_punch_interval = tp->full_punch_interval;
 164
 165         for(std::map<std::string, s16>::const_iterator
 166                         i = tp->damageGroups.begin(); i != tp->damageGroups.end(); i++){
 167                 s16 armor = itemgroup_get(armor_groups, i->first);
 168                 damage += i->second * rangelim(time_from_last_punch * full_punch_interval, 0.0, 1.0)
 169                                 * armor / 100.0;
 170         }
 171
 172         return HitParams(damage, 0);
 173 }
 174
 175 HitParams getHitParams(const ItemGroupList &armor_groups,
 176                 const ToolCapabilities *tp)
 177 {
 178         return getHitParams(armor_groups, tp, 1000000);
 179 }
 180
 181 PunchDamageResult getPunchDamage(
 182                 const ItemGroupList &armor_groups,
 183                 const ToolCapabilities *toolcap,
 184                 const ItemStack *punchitem,
 185                 float time_from_last_punch
 186 ){
 187         bool do_hit = true;
 188         {
 189                 if(do_hit && punchitem){
 190                         if(itemgroup_get(armor_groups, "punch_operable") &&
 191                                         (toolcap == NULL || punchitem->name == ""))
 192                                 do_hit = false;
 193                 }
 194                 if(do_hit){
 195                         if(itemgroup_get(armor_groups, "immortal"))
 196                                 do_hit = false;
 197                 }
 198         }
 199
 200         PunchDamageResult result;
 201         if(do_hit)
 202         {
 203                 HitParams hitparams = getHitParams(armor_groups, toolcap,
 204                                 time_from_last_punch);
 205                 result.did_punch = true;
 206                 result.wear = hitparams.wear;
 207                 result.damage = hitparams.hp;
 208         }
 209
 210         return result;
 211 }
 212
 213