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, 2); // version (protocol >= 18)
  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 != 1 && version != 2) throw SerializationError(
  59                         "unsupported ToolCapabilities version");
  60         full_punch_interval = readF1000(is);
  61         max_drop_level = readS16(is);
  62         groupcaps.clear();
  63         u32 groupcaps_size = readU32(is);
  64         for(u32 i=0; i<groupcaps_size; i++){
  65                 std::string name = deSerializeString(is);
  66                 ToolGroupCap cap;
  67                 cap.uses = readS16(is);
  68                 cap.maxlevel = readS16(is);
  69                 u32 times_size = readU32(is);
  70                 for(u32 i=0; i<times_size; i++){
  71                         int level = readS16(is);
  72                         float time = readF1000(is);
  73                         cap.times[level] = time;
  74                 }
  75                 groupcaps[name] = cap;
  76         }
  77         if(version == 2)
  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
  88 DigParams getDigParams(const ItemGroupList &groups,
  89                 const ToolCapabilities *tp, float time_from_last_punch)
  90 {
  91         //infostream<<"getDigParams"<<std::endl;
  92         /* Check group dig_immediate */
  93         switch(itemgroup_get(groups, "dig_immediate")){
  94         case 2:
  95                 //infostream<<"dig_immediate=2"<<std::endl;
  96                 return DigParams(true, 0.5, 0, "dig_immediate");
  97         case 3:
  98                 //infostream<<"dig_immediate=3"<<std::endl;
  99                 return DigParams(true, 0, 0, "dig_immediate");
 100         default:
 101                 break;
 102         }
 103
 104         // Values to be returned (with a bit of conversion)
 105         bool result_diggable = false;
 106         float result_time = 0.0;
 107         float result_wear = 0.0;
 108         std::string result_main_group;
 109
 110         int level = itemgroup_get(groups, "level");
 111         //infostream<<"level="<<level<<std::endl;
 112         for (const auto &groupcap : tp->groupcaps) {
 113                 const std::string &name = groupcap.first;
 114                 //infostream<<"group="<<name<<std::endl;
 115                 const ToolGroupCap &cap = groupcap.second;
 116                 int rating = itemgroup_get(groups, name);
 117                 float time = 0;
 118                 bool time_exists = cap.getTime(rating, &time);
 119                 if(!result_diggable || time < result_time){
 120                         if(cap.maxlevel >= level && time_exists){
 121                                 result_diggable = true;
 122                                 int leveldiff = cap.maxlevel - level;
 123                                 result_time = time / MYMAX(1, leveldiff);
 124                                 if(cap.uses != 0)
 125                                         result_wear = 1.0 / cap.uses / pow(3.0, (double)leveldiff);
 126                                 else
 127                                         result_wear = 0;
 128                                 result_main_group = name;
 129                         }
 130                 }
 131         }
 132         //infostream<<"result_diggable="<<result_diggable<<std::endl;
 133         //infostream<<"result_time="<<result_time<<std::endl;
 134         //infostream<<"result_wear="<<result_wear<<std::endl;
 135
 136         if(time_from_last_punch < tp->full_punch_interval){
 137                 float f = time_from_last_punch / tp->full_punch_interval;
 138                 //infostream<<"f="<<f<<std::endl;
 139                 result_time /= f;
 140                 result_wear /= f;
 141         }
 142
 143         u16 wear_i = 65535.*result_wear;
 144         return DigParams(result_diggable, result_time, wear_i, result_main_group);
 145 }
 146
 147 DigParams getDigParams(const ItemGroupList &groups,
 148                 const ToolCapabilities *tp)
 149 {
 150         return getDigParams(groups, tp, 1000000);
 151 }
 152
 153 HitParams getHitParams(const ItemGroupList &armor_groups,
 154                 const ToolCapabilities *tp, float time_from_last_punch)
 155 {
 156         s16 damage = 0;
 157         float full_punch_interval = tp->full_punch_interval;
 158
 159         for (const auto &damageGroup : tp->damageGroups) {
 160                 s16 armor = itemgroup_get(armor_groups, damageGroup.first);
 161                 damage += damageGroup.second
 162                                 * rangelim(time_from_last_punch / full_punch_interval, 0.0, 1.0)
 163                                 * armor / 100.0;
 164         }
 165
 166         return {damage, 0};
 167 }
 168
 169 HitParams getHitParams(const ItemGroupList &armor_groups,
 170                 const ToolCapabilities *tp)
 171 {
 172         return getHitParams(armor_groups, tp, 1000000);
 173 }
 174
 175 PunchDamageResult getPunchDamage(
 176                 const ItemGroupList &armor_groups,
 177                 const ToolCapabilities *toolcap,
 178                 const ItemStack *punchitem,
 179                 float time_from_last_punch
 180 ){
 181         bool do_hit = true;
 182         {
 183                 if (do_hit && punchitem) {
 184                         if (itemgroup_get(armor_groups, "punch_operable") &&
 185                                         (toolcap == NULL || punchitem->name.empty()))
 186                                 do_hit = false;
 187                 }
 188
 189                 if (do_hit) {
 190                         if(itemgroup_get(armor_groups, "immortal"))
 191                                 do_hit = false;
 192                 }
 193         }
 194
 195         PunchDamageResult result;
 196         if(do_hit)
 197         {
 198                 HitParams hitparams = getHitParams(armor_groups, toolcap,
 199                                 time_from_last_punch);
 200                 result.did_punch = true;
 201                 result.wear = hitparams.wear;
 202                 result.damage = hitparams.hp;
 203         }
 204
 205         return result;
 206 }
 207
 208