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- /*
- Minetest
- Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
- #include "tool.h"
- #include "itemdef.h"
- #include "itemgroup.h"
- #include "log.h"
- #include "inventory.h"
- #include "exceptions.h"
- #include "convert_json.h"
- #include "util/serialize.h"
- #include "util/numeric.h"
- void ToolGroupCap::toJson(Json::Value &object) const
- {
- object["maxlevel"] = maxlevel;
- object["uses"] = uses;
- Json::Value times_object;
- for (auto time : times)
- times_object[time.first] = time.second;
- object["times"] = std::move(times_object);
- }
- void ToolGroupCap::fromJson(const Json::Value &json)
- {
- if (json.isObject()) {
- if (json["maxlevel"].isInt())
- maxlevel = json["maxlevel"].asInt();
- if (json["uses"].isInt())
- uses = json["uses"].asInt();
- const Json::Value ×_object = json["times"];
- if (times_object.isArray()) {
- Json::ArrayIndex size = times_object.size();
- for (Json::ArrayIndex i = 0; i < size; ++i)
- if (times_object[i].isDouble())
- times[i] = times_object[i].asFloat();
- }
- }
- }
- void ToolCapabilities::serialize(std::ostream &os, u16 protocol_version) const
- {
- if (protocol_version >= 38)
- writeU8(os, 5);
- else
- writeU8(os, 4); // proto == 37
- writeF32(os, full_punch_interval);
- writeS16(os, max_drop_level);
- writeU32(os, groupcaps.size());
- for (const auto &groupcap : groupcaps) {
- const std::string *name = &groupcap.first;
- const ToolGroupCap *cap = &groupcap.second;
- os << serializeString16(*name);
- writeS16(os, cap->uses);
- writeS16(os, cap->maxlevel);
- writeU32(os, cap->times.size());
- for (const auto &time : cap->times) {
- writeS16(os, time.first);
- writeF32(os, time.second);
- }
- }
- writeU32(os, damageGroups.size());
- for (const auto &damageGroup : damageGroups) {
- os << serializeString16(damageGroup.first);
- writeS16(os, damageGroup.second);
- }
- if (protocol_version >= 38)
- writeU16(os, rangelim(punch_attack_uses, 0, U16_MAX));
- }
- void ToolCapabilities::deSerialize(std::istream &is)
- {
- int version = readU8(is);
- if (version < 4)
- throw SerializationError("unsupported ToolCapabilities version");
- full_punch_interval = readF32(is);
- max_drop_level = readS16(is);
- groupcaps.clear();
- u32 groupcaps_size = readU32(is);
- for (u32 i = 0; i < groupcaps_size; i++) {
- std::string name = deSerializeString16(is);
- ToolGroupCap cap;
- cap.uses = readS16(is);
- cap.maxlevel = readS16(is);
- u32 times_size = readU32(is);
- for(u32 i = 0; i < times_size; i++) {
- int level = readS16(is);
- float time = readF32(is);
- cap.times[level] = time;
- }
- groupcaps[name] = cap;
- }
- u32 damage_groups_size = readU32(is);
- for (u32 i = 0; i < damage_groups_size; i++) {
- std::string name = deSerializeString16(is);
- s16 rating = readS16(is);
- damageGroups[name] = rating;
- }
- if (version >= 5)
- punch_attack_uses = readU16(is);
- }
- void ToolCapabilities::serializeJson(std::ostream &os) const
- {
- Json::Value root;
- root["full_punch_interval"] = full_punch_interval;
- root["max_drop_level"] = max_drop_level;
- root["punch_attack_uses"] = punch_attack_uses;
- Json::Value groupcaps_object;
- for (const auto &groupcap : groupcaps) {
- groupcap.second.toJson(groupcaps_object[groupcap.first]);
- }
- root["groupcaps"] = std::move(groupcaps_object);
- Json::Value damage_groups_object;
- for (const auto &damagegroup : damageGroups) {
- damage_groups_object[damagegroup.first] = damagegroup.second;
- }
- root["damage_groups"] = std::move(damage_groups_object);
- fastWriteJson(root, os);
- }
- void ToolCapabilities::deserializeJson(std::istream &is)
- {
- Json::Value root;
- is >> root;
- if (root.isObject()) {
- if (root["full_punch_interval"].isDouble())
- full_punch_interval = root["full_punch_interval"].asFloat();
- if (root["max_drop_level"].isInt())
- max_drop_level = root["max_drop_level"].asInt();
- if (root["punch_attack_uses"].isInt())
- punch_attack_uses = root["punch_attack_uses"].asInt();
- Json::Value &groupcaps_object = root["groupcaps"];
- if (groupcaps_object.isObject()) {
- Json::ValueIterator gciter;
- for (gciter = groupcaps_object.begin();
- gciter != groupcaps_object.end(); ++gciter) {
- ToolGroupCap groupcap;
- groupcap.fromJson(*gciter);
- groupcaps[gciter.key().asString()] = groupcap;
- }
- }
- Json::Value &damage_groups_object = root["damage_groups"];
- if (damage_groups_object.isObject()) {
- Json::ValueIterator dgiter;
- for (dgiter = damage_groups_object.begin();
- dgiter != damage_groups_object.end(); ++dgiter) {
- Json::Value &value = *dgiter;
- if (value.isInt())
- damageGroups[dgiter.key().asString()] =
- value.asInt();
- }
- }
- }
- }
- u32 calculateResultWear(const u32 uses, const u16 initial_wear)
- {
- if (uses == 0) {
- // Trivial case: Infinite uses
- return 0;
- }
- /* Finite uses. This is not trivial,
- as the maximum wear is not neatly evenly divisible by
- most possible uses numbers. For example, for 128
- uses, the calculation of wear is trivial, as
- 65536 / 128 uses = 512 wear,
- so the tool will get 512 wear 128 times in its lifetime.
- But for a number like 130, this does not work:
- 65536 / 130 uses = 504.123... wear.
- Since wear must be an integer, we will get
- 504*130 = 65520, which would lead to the wrong number
- of uses.
- Instead, we partition the "wear range" into blocks:
- A block represents a single use and can be
- of two possible sizes: normal and oversized.
- A normal block is equal to floor(65536 / uses).
- An oversized block is a normal block plus 1.
- Then we determine how many oversized and normal
- blocks we need and finally, whether we add
- the normal wear or the oversized wear.
- Example for 130 uses:
- * Normal wear = 504
- * Number of normal blocks = 114
- * Oversized wear = 505
- * Number of oversized blocks = 16
- If we add everything together, we get:
- 114*504 + 16*505 = 65536
- */
- u32 result_wear;
- u32 wear_normal = ((U16_MAX+1) / uses);
- // Will be non-zero if its not evenly divisible
- u16 blocks_oversize = (U16_MAX+1) % uses;
- // Whether to add one extra wear point in case
- // of oversized wear.
- u16 wear_extra = 0;
- if (blocks_oversize > 0) {
- u16 blocks_normal = uses - blocks_oversize;
- /* When the wear has reached this value, we
- know that wear_normal has been applied
- for blocks_normal times, therefore,
- only oversized blocks remain.
- This also implies the raw tool wear number
- increases a bit faster after this point,
- but this should be barely noticeable by the
- player.
- */
- u16 wear_extra_at = blocks_normal * wear_normal;
- if (initial_wear >= wear_extra_at) {
- wear_extra = 1;
- }
- }
- result_wear = wear_normal + wear_extra;
- return result_wear;
- }
- DigParams getDigParams(const ItemGroupList &groups,
- const ToolCapabilities *tp,
- const u16 initial_wear)
- {
- // Group dig_immediate defaults to fixed time and no wear
- if (tp->groupcaps.find("dig_immediate") == tp->groupcaps.cend()) {
- switch (itemgroup_get(groups, "dig_immediate")) {
- case 2:
- return DigParams(true, 0.5, 0, "dig_immediate");
- case 3:
- return DigParams(true, 0, 0, "dig_immediate");
- default:
- break;
- }
- }
- // Values to be returned (with a bit of conversion)
- bool result_diggable = false;
- float result_time = 0.0;
- u32 result_wear = 0;
- std::string result_main_group;
- int level = itemgroup_get(groups, "level");
- for (const auto &groupcap : tp->groupcaps) {
- const ToolGroupCap &cap = groupcap.second;
- int leveldiff = cap.maxlevel - level;
- if (leveldiff < 0)
- continue;
- const std::string &groupname = groupcap.first;
- float time = 0;
- int rating = itemgroup_get(groups, groupname);
- bool time_exists = cap.getTime(rating, &time);
- if (!time_exists)
- continue;
- if (leveldiff > 1)
- time /= leveldiff;
- if (!result_diggable || time < result_time) {
- result_time = time;
- result_diggable = true;
- // The actual number of uses increases
- // exponentially with leveldiff.
- // If the levels are equal, real_uses equals cap.uses.
- u32 real_uses = cap.uses * pow(3.0, leveldiff);
- real_uses = MYMIN(real_uses, U16_MAX);
- result_wear = calculateResultWear(real_uses, initial_wear);
- result_main_group = groupname;
- }
- }
- return DigParams(result_diggable, result_time, result_wear, result_main_group);
- }
- HitParams getHitParams(const ItemGroupList &armor_groups,
- const ToolCapabilities *tp, float time_from_last_punch,
- u16 initial_wear)
- {
- s32 damage = 0;
- float result_wear = 0.0f;
- float punch_interval_multiplier =
- rangelim(time_from_last_punch / tp->full_punch_interval, 0.0f, 1.0f);
- for (const auto &damageGroup : tp->damageGroups) {
- s16 armor = itemgroup_get(armor_groups, damageGroup.first);
- damage += damageGroup.second * punch_interval_multiplier * armor / 100.0;
- }
- if (tp->punch_attack_uses > 0) {
- result_wear = calculateResultWear(tp->punch_attack_uses, initial_wear);
- result_wear *= punch_interval_multiplier;
- }
- // Keep damage in sane bounds for simplicity
- damage = rangelim(damage, -U16_MAX, U16_MAX);
- u32 wear_i = (u32) result_wear;
- return {damage, wear_i};
- }
- HitParams getHitParams(const ItemGroupList &armor_groups,
- const ToolCapabilities *tp)
- {
- return getHitParams(armor_groups, tp, 1000000);
- }
- PunchDamageResult getPunchDamage(
- const ItemGroupList &armor_groups,
- const ToolCapabilities *toolcap,
- const ItemStack *punchitem,
- float time_from_last_punch,
- u16 initial_wear
- ){
- bool do_hit = true;
- {
- if (do_hit && punchitem) {
- if (itemgroup_get(armor_groups, "punch_operable") &&
- (toolcap == NULL || punchitem->name.empty()))
- do_hit = false;
- }
- if (do_hit) {
- if(itemgroup_get(armor_groups, "immortal"))
- do_hit = false;
- }
- }
- PunchDamageResult result;
- if(do_hit)
- {
- HitParams hitparams = getHitParams(armor_groups, toolcap,
- time_from_last_punch,
- punchitem->wear);
- result.did_punch = true;
- result.wear = hitparams.wear;
- result.damage = hitparams.hp;
- }
- return result;
- }
- f32 getToolRange(const ItemDefinition &def_selected, const ItemDefinition &def_hand)
- {
- float max_d = def_selected.range;
- float max_d_hand = def_hand.range;
- if (max_d < 0 && max_d_hand >= 0)
- max_d = max_d_hand;
- else if (max_d < 0)
- max_d = 4.0f;
- return max_d;
- }
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