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