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attack.cpp
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attack.cpp
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/*
Copyright (C) 2003 - 2018 by David White <dave@whitevine.net>
Part of the Battle for Wesnoth Project https://www.wesnoth.org/
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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.
See the COPYING file for more details.
*/
/**
* @file
* Fighting.
*/
#include "actions/attack.hpp"
#include "actions/advancement.hpp"
#include "actions/vision.hpp"
#include "ai/lua/aspect_advancements.hpp"
#include "game_config.hpp"
#include "game_data.hpp"
#include "game_events/pump.hpp"
#include "gettext.hpp"
#include "log.hpp"
#include "map/map.hpp"
#include "mouse_handler_base.hpp"
#include "play_controller.hpp"
#include "preferences/game.hpp"
#include "random.hpp"
#include "replay.hpp"
#include "resources.hpp"
#include "statistics.hpp"
#include "synced_checkup.hpp"
#include "synced_user_choice.hpp"
#include "team.hpp"
#include "tod_manager.hpp"
#include "units/abilities.hpp"
#include "units/animation_component.hpp"
#include "units/helper.hpp"
#include "units/filter.hpp"
#include "units/map.hpp"
#include "units/udisplay.hpp"
#include "units/unit.hpp"
#include "whiteboard/manager.hpp"
#include "wml_exception.hpp"
static lg::log_domain log_engine("engine");
#define DBG_NG LOG_STREAM(debug, log_engine)
#define LOG_NG LOG_STREAM(info, log_engine)
#define WRN_NG LOG_STREAM(err, log_engine)
#define ERR_NG LOG_STREAM(err, log_engine)
static lg::log_domain log_attack("engine/attack");
#define DBG_AT LOG_STREAM(debug, log_attack)
#define LOG_AT LOG_STREAM(info, log_attack)
#define WRN_AT LOG_STREAM(err, log_attack)
#define ERR_AT LOG_STREAM(err, log_attack)
static lg::log_domain log_config("config");
#define LOG_CF LOG_STREAM(info, log_config)
// ==================================================================================
// BATTLE CONTEXT UNIT STATS
// ==================================================================================
battle_context_unit_stats::battle_context_unit_stats(const unit& u,
const map_location& u_loc,
int u_attack_num,
bool attacking,
const unit& opp,
const map_location& opp_loc,
const_attack_ptr opp_weapon,
const unit_map& units)
: weapon(nullptr)
, attack_num(u_attack_num)
, is_attacker(attacking)
, is_poisoned(u.get_state(unit::STATE_POISONED))
, is_slowed(u.get_state(unit::STATE_SLOWED))
, slows(false)
, drains(false)
, petrifies(false)
, plagues(false)
, poisons(false)
, backstab_pos(false)
, swarm(false)
, firststrike(false)
, disable(false)
, experience(u.experience())
, max_experience(u.max_experience())
, level(u.level())
, rounds(1)
, hp(0)
, max_hp(u.max_hitpoints())
, chance_to_hit(0)
, damage(0)
, slow_damage(0)
, drain_percent(0)
, drain_constant(0)
, num_blows(0)
, swarm_min(0)
, swarm_max(0)
, plague_type()
{
// Get the current state of the unit.
if(attack_num >= 0) {
weapon = u.attacks()[attack_num].shared_from_this();
}
if(u.hitpoints() < 0) {
LOG_CF << "Unit with " << u.hitpoints() << " hitpoints found, set to 0 for damage calculations\n";
hp = 0;
} else if(u.hitpoints() > u.max_hitpoints()) {
// If a unit has more hp than its maximum, the engine will fail with an
// assertion failure due to accessing the prob_matrix out of bounds.
hp = u.max_hitpoints();
} else {
hp = u.hitpoints();
}
// Exit if no weapon.
if(!weapon) {
return;
}
// Get the weapon characteristics as appropriate.
auto ctx = weapon->specials_context(&u, &opp, u_loc, opp_loc, attacking, opp_weapon);
boost::optional<decltype(ctx)> opp_ctx;
if(opp_weapon) {
opp_ctx.emplace(opp_weapon->specials_context(&opp, &u, opp_loc, u_loc, !attacking, weapon));
}
slows = weapon->bool_ability("slow");
drains = !opp.get_state("undrainable") && weapon->bool_ability("drains");
petrifies = weapon->bool_ability("petrifies");
poisons = !opp.get_state("unpoisonable") && weapon->bool_ability("poison") && !opp.get_state(unit::STATE_POISONED);
backstab_pos = is_attacker && backstab_check(u_loc, opp_loc, units, resources::gameboard->teams());
rounds = weapon->get_specials("berserk").highest("value", 1).first;
if(weapon->combat_ability("berserk", 1).second) {
rounds = weapon->combat_ability("berserk", 1).first;
}
firststrike = weapon->bool_ability("firststrike");
{
const int distance = distance_between(u_loc, opp_loc);
const bool out_of_range = distance > weapon->max_range() || distance < weapon->min_range();
disable = weapon->get_special_bool("disable") || out_of_range;
}
// Handle plague.
unit_ability_list plague_specials = weapon->get_specials("plague");
plagues = !opp.get_state("unplagueable") && !plague_specials.empty() &&
opp.undead_variation() != "null" && !resources::gameboard->map().is_village(opp_loc);
if(plagues) {
plague_type = (*plague_specials.front().first)["type"].str();
if(plague_type.empty()) {
plague_type = u.type().base_id();
}
}
// Compute chance to hit.
signed int cth = opp.defense_modifier(resources::gameboard->map().get_terrain(opp_loc)) + weapon->accuracy()
- (opp_weapon ? opp_weapon->parry() : 0);
cth = utils::clamp(cth, 0, 100);
unit_ability_list cth_specials = weapon->get_specials("chance_to_hit");
unit_abilities::effect cth_effects(cth_specials, cth, backstab_pos);
cth = cth_effects.get_composite_value();
cth = utils::clamp(cth, 0, 100);
cth = weapon->combat_ability("chance_to_hit", cth, backstab_pos).first;
if(opp.get_state("invulnerable")) {
cth = 0;
}
chance_to_hit = utils::clamp(cth, 0, 100);
// Compute base damage done with the weapon.
int base_damage = weapon->modified_damage(backstab_pos);
// Get the damage multiplier applied to the base damage of the weapon.
int damage_multiplier = 100;
// Time of day bonus.
damage_multiplier += combat_modifier(
resources::gameboard->units(), resources::gameboard->map(), u_loc, u.alignment(), u.is_fearless());
// Leadership bonus.
int leader_bonus = under_leadership(u, u_loc, weapon, opp_weapon);
if(leader_bonus != 0) {
damage_multiplier += leader_bonus;
}
// Resistance modifier.
damage_multiplier *= opp.damage_from(*weapon, !attacking, opp_loc, opp_weapon);
// Compute both the normal and slowed damage.
damage = round_damage(base_damage, damage_multiplier, 10000);
slow_damage = round_damage(base_damage, damage_multiplier, 20000);
if(is_slowed) {
damage = slow_damage;
}
// Compute drain amounts only if draining is possible.
if(drains) {
if (weapon->get_special_bool("drains")) {
unit_ability_list drain_specials = weapon->get_specials("drains");
// Compute the drain percent (with 50% as the base for backward compatibility)
unit_abilities::effect drain_percent_effects(drain_specials, 50, backstab_pos);
drain_percent = drain_percent_effects.get_composite_value();
}
if (weapon->combat_ability("drains", 50, backstab_pos).second) {
drain_percent = weapon->combat_ability("drains", 50, backstab_pos).first;
}
}
// Add heal_on_hit (the drain constant)
unit_ability_list heal_on_hit_specials = weapon->get_specials("heal_on_hit");
unit_abilities::effect heal_on_hit_effects(heal_on_hit_specials, 0, backstab_pos);
drain_constant += heal_on_hit_effects.get_composite_value();
drains = drain_constant || drain_percent;
// Compute the number of blows and handle swarm.
weapon->modified_attacks(backstab_pos, swarm_min, swarm_max);
swarm = swarm_min != swarm_max;
num_blows = calc_blows(hp);
}
battle_context_unit_stats::battle_context_unit_stats(const unit_type* u_type,
const_attack_ptr att_weapon,
bool attacking,
const unit_type* opp_type,
const_attack_ptr opp_weapon,
unsigned int opp_terrain_defense,
int lawful_bonus)
: weapon(att_weapon)
, attack_num(-2) // This is and stays invalid. Always use weapon when using this constructor.
, is_attacker(attacking)
, is_poisoned(false)
, is_slowed(false)
, slows(false)
, drains(false)
, petrifies(false)
, plagues(false)
, poisons(false)
, backstab_pos(false)
, swarm(false)
, firststrike(false)
, disable(false)
, experience(0)
, max_experience(0)
, level(0)
, rounds(1)
, hp(0)
, max_hp(0)
, chance_to_hit(0)
, damage(0)
, slow_damage(0)
, drain_percent(0)
, drain_constant(0)
, num_blows(0)
, swarm_min(0)
, swarm_max(0)
, plague_type()
{
if(!u_type || !opp_type) {
return;
}
// Get the current state of the unit.
if(u_type->hitpoints() < 0) {
hp = 0;
} else {
hp = u_type->hitpoints();
}
max_experience = u_type->experience_needed();
level = (u_type->level());
max_hp = (u_type->hitpoints());
// Exit if no weapon.
if(!weapon) {
return;
}
// Get the weapon characteristics as appropriate.
auto ctx = weapon->specials_context(*u_type, map_location::null_location(), attacking);
boost::optional<decltype(ctx)> opp_ctx;
if(opp_weapon) {
opp_ctx.emplace(opp_weapon->specials_context(*opp_type, map_location::null_location(), !attacking));
}
slows = weapon->get_special_bool("slow");
drains = !opp_type->musthave_status("undrainable") && weapon->get_special_bool("drains");
petrifies = weapon->get_special_bool("petrifies");
poisons = !opp_type->musthave_status("unpoisonable") && weapon->get_special_bool("poison");
rounds = weapon->get_specials("berserk").highest("value", 1).first;
firststrike = weapon->get_special_bool("firststrike");
disable = weapon->get_special_bool("disable");
unit_ability_list plague_specials = weapon->get_specials("plague");
plagues = !opp_type->musthave_status("unplagueable") && !plague_specials.empty() &&
opp_type->undead_variation() != "null";
if(plagues) {
plague_type = (*plague_specials.front().first)["type"].str();
if(plague_type.empty()) {
plague_type = u_type->base_id();
}
}
signed int cth = 100 - opp_terrain_defense + weapon->accuracy() - (opp_weapon ? opp_weapon->parry() : 0);
cth = utils::clamp(cth, 0, 100);
unit_ability_list cth_specials = weapon->get_specials("chance_to_hit");
unit_abilities::effect cth_effects(cth_specials, cth, backstab_pos);
cth = cth_effects.get_composite_value();
chance_to_hit = utils::clamp(cth, 0, 100);
int base_damage = weapon->modified_damage(backstab_pos);
int damage_multiplier = 100;
damage_multiplier
+= generic_combat_modifier(lawful_bonus, u_type->alignment(), u_type->musthave_status("fearless"), 0);
damage_multiplier *= opp_type->resistance_against(weapon->type(), !attacking);
damage = round_damage(base_damage, damage_multiplier, 10000);
slow_damage = round_damage(base_damage, damage_multiplier, 20000);
if(drains) {
unit_ability_list drain_specials = weapon->get_specials("drains");
// Compute the drain percent (with 50% as the base for backward compatibility)
unit_abilities::effect drain_percent_effects(drain_specials, 50, backstab_pos);
drain_percent = drain_percent_effects.get_composite_value();
}
// Add heal_on_hit (the drain constant)
unit_ability_list heal_on_hit_specials = weapon->get_specials("heal_on_hit");
unit_abilities::effect heal_on_hit_effects(heal_on_hit_specials, 0, backstab_pos);
drain_constant += heal_on_hit_effects.get_composite_value();
drains = drain_constant || drain_percent;
// Compute the number of blows and handle swarm.
weapon->modified_attacks(backstab_pos, swarm_min, swarm_max);
swarm = swarm_min != swarm_max;
num_blows = calc_blows(hp);
}
// ==================================================================================
// BATTLE CONTEXT
// ==================================================================================
battle_context::battle_context(
const unit& attacker,
const map_location& a_loc,
int a_wep_index,
const unit& defender,
const map_location& d_loc,
int d_wep_index,
const unit_map& units)
: attacker_stats_()
, defender_stats_()
, attacker_combatant_()
, defender_combatant_()
{
size_t a_wep_uindex = static_cast<size_t>(a_wep_index);
size_t d_wep_uindex = static_cast<size_t>(d_wep_index);
const_attack_ptr a_wep(a_wep_uindex < attacker.attacks().size() ? attacker.attacks()[a_wep_index].shared_from_this() : nullptr);
const_attack_ptr d_wep(d_wep_uindex < defender.attacks().size() ? defender.attacks()[d_wep_index].shared_from_this() : nullptr);
attacker_stats_.reset(new battle_context_unit_stats(attacker, a_loc, a_wep_index, true , defender, d_loc, d_wep, units));
defender_stats_.reset(new battle_context_unit_stats(defender, d_loc, d_wep_index, false, attacker, a_loc, a_wep, units));
}
void battle_context::simulate(const combatant* prev_def)
{
assert((attacker_combatant_.get() != nullptr) == (defender_combatant_.get() != nullptr));
assert(attacker_stats_);
assert(defender_stats_);
if(!attacker_combatant_) {
attacker_combatant_.reset(new combatant(*attacker_stats_));
defender_combatant_.reset(new combatant(*defender_stats_, prev_def));
attacker_combatant_->fight(*defender_combatant_);
}
}
// more like a factory method than a constructor, always calls one of the other constructors.
battle_context::battle_context(const unit_map& units,
const map_location& attacker_loc,
const map_location& defender_loc,
int attacker_weapon,
int defender_weapon,
double aggression,
const combatant* prev_def,
const unit* attacker_ptr,
const unit* defender_ptr)
: attacker_stats_(nullptr)
, defender_stats_(nullptr)
, attacker_combatant_(nullptr)
, defender_combatant_(nullptr)
{
//TODO: maybe check before dereferencing units.find(attacker_loc),units.find(defender_loc) ?
const unit& attacker = attacker_ptr ? *attacker_ptr : *units.find(attacker_loc);
const unit& defender = defender_ptr ? *defender_ptr : *units.find(defender_loc);
const double harm_weight = 1.0 - aggression;
if(attacker_weapon == -1) {
*this = choose_attacker_weapon(
attacker, defender, units, attacker_loc, defender_loc, harm_weight, prev_def
);
}
else if(defender_weapon == -1) {
*this = choose_defender_weapon(
attacker, defender, attacker_weapon, units, attacker_loc, defender_loc, prev_def
);
}
else {
*this = battle_context(attacker, attacker_loc, attacker_weapon, defender, defender_loc, defender_weapon, units);
}
assert(attacker_stats_);
assert(defender_stats_);
}
battle_context::battle_context(const battle_context_unit_stats& att, const battle_context_unit_stats& def)
: attacker_stats_(new battle_context_unit_stats(att))
, defender_stats_(new battle_context_unit_stats(def))
, attacker_combatant_(nullptr)
, defender_combatant_(nullptr)
{
}
/** @todo FIXME: better to initialize combatant initially (move into
battle_context_unit_stats?), just do fight() when required. */
const combatant& battle_context::get_attacker_combatant(const combatant* prev_def)
{
// We calculate this lazily, since AI doesn't always need it.
simulate(prev_def);
return *attacker_combatant_;
}
const combatant& battle_context::get_defender_combatant(const combatant* prev_def)
{
// We calculate this lazily, since AI doesn't always need it.
simulate(prev_def);
return *defender_combatant_;
}
// Given this harm_weight, are we better than that other context?
bool battle_context::better_attack(class battle_context& that, double harm_weight)
{
return better_combat(
get_attacker_combatant(),
get_defender_combatant(),
that.get_attacker_combatant(),
that.get_defender_combatant(),
harm_weight
);
}
// Given this harm_weight, are we better than that other context?
bool battle_context::better_defense(class battle_context& that, double harm_weight)
{
return better_combat(
get_defender_combatant(),
get_attacker_combatant(),
that.get_defender_combatant(),
that.get_attacker_combatant(),
harm_weight
);
}
// Does combat A give us a better result than combat B?
bool battle_context::better_combat(const combatant& us_a,
const combatant& them_a,
const combatant& us_b,
const combatant& them_b,
double harm_weight)
{
double a, b;
// Compare: P(we kill them) - P(they kill us).
a = them_a.hp_dist[0] - us_a.hp_dist[0] * harm_weight;
b = them_b.hp_dist[0] - us_b.hp_dist[0] * harm_weight;
if(a - b < -0.01) {
return false;
}
if(a - b > 0.01) {
return true;
}
// Add poison to calculations
double poison_a_us = (us_a.poisoned) * game_config::poison_amount;
double poison_a_them = (them_a.poisoned) * game_config::poison_amount;
double poison_b_us = (us_b.poisoned) * game_config::poison_amount;
double poison_b_them = (them_b.poisoned) * game_config::poison_amount;
// Compare: damage to them - damage to us (average_hp replaces -damage)
a = (us_a.average_hp() - poison_a_us) * harm_weight - (them_a.average_hp() - poison_a_them);
b = (us_b.average_hp() - poison_b_us) * harm_weight - (them_b.average_hp() - poison_b_them);
if(a - b < -0.01) {
return false;
}
if(a - b > 0.01) {
return true;
}
// All else equal: go for most damage.
return them_a.average_hp() < them_b.average_hp();
}
battle_context battle_context::choose_attacker_weapon(const unit& attacker,
const unit& defender,
const unit_map& units,
const map_location& attacker_loc,
const map_location& defender_loc,
double harm_weight,
const combatant* prev_def)
{
log_scope2(log_attack, "choose_attacker_weapon");
std::vector<battle_context> choices;
// What options does attacker have?
for(size_t i = 0; i < attacker.attacks().size(); ++i) {
const attack_type& att = attacker.attacks()[i];
if(att.attack_weight() <= 0) {
continue;
}
battle_context bc = choose_defender_weapon(attacker, defender, i, units, attacker_loc, defender_loc, prev_def);
//choose_defender_weapon will always choose the weapon that disabels the attackers weapon if possible.
if(bc.attacker_stats_->disable) {
continue;
}
choices.emplace_back(std::move(bc));
}
if(choices.empty()) {
return battle_context(attacker, attacker_loc, -1, defender, defender_loc, -1, units);
}
if(choices.size() == 1) {
return std::move(choices[0]);
}
// Multiple options: simulate them, save best.
battle_context* best_choice = nullptr;
for(auto& choice : choices) {
// If choose_defender_weapon didn't simulate, do so now.
choice.simulate(prev_def);
if(!best_choice || choice.better_attack(*best_choice, harm_weight)) {
best_choice = &choice;
}
}
if(best_choice) {
return std::move(*best_choice);
}
else {
return battle_context(attacker, attacker_loc, -1, defender, defender_loc, -1, units);
}
}
/** @todo FIXME: Hand previous defender unit in here. */
battle_context battle_context::choose_defender_weapon(const unit& attacker,
const unit& defender,
unsigned attacker_weapon,
const unit_map& units,
const map_location& attacker_loc,
const map_location& defender_loc,
const combatant* prev_def)
{
log_scope2(log_attack, "choose_defender_weapon");
VALIDATE(attacker_weapon < attacker.attacks().size(), _("An invalid attacker weapon got selected."));
const attack_type& att = attacker.attacks()[attacker_weapon];
auto no_weapon = [&]() { return battle_context(attacker, attacker_loc, attacker_weapon, defender, defender_loc, -1, units); };
std::vector<battle_context> choices;
// What options does defender have?
for(size_t i = 0; i < defender.attacks().size(); ++i) {
const attack_type& def = defender.attacks()[i];
if(def.range() != att.range() || def.defense_weight() <= 0) {
//no need to calculate the battle_context here.
continue;
}
battle_context bc(attacker, attacker_loc, attacker_weapon, defender, defender_loc, i, units);
if(bc.defender_stats_->disable) {
continue;
}
if(bc.attacker_stats_->disable) {
//the defenders attack disables the attakers attack: always choose this one.
return bc;
}
choices.emplace_back(std::move(bc));
}
if(choices.empty()) {
return no_weapon();
}
if(choices.size() == 1) {
//only one usable weapon, don't simulate
return std::move(choices[0]);
}
// Multiple options:
// First pass : get the best weight and the minimum simple rating for this weight.
// simple rating = number of blows * damage per blows (resistance taken in account) * cth * weight
// Eligible attacks for defense should have a simple rating greater or equal to this weight.
int min_rating = 0;
{
double max_weight = 0.0;
for(const auto& choice : choices) {
const attack_type& def = defender.attacks()[choice.defender_stats_->attack_num];
if(def.defense_weight() >= max_weight) {
const battle_context_unit_stats& def_stats = *choice.defender_stats_;
max_weight = def.defense_weight();
int rating = static_cast<int>(
def_stats.num_blows * def_stats.damage * def_stats.chance_to_hit * def.defense_weight());
if(def.defense_weight() > max_weight || rating < min_rating) {
min_rating = rating;
}
}
}
}
battle_context* best_choice = nullptr;
// Multiple options: simulate them, save best.
for(auto& choice : choices) {
const attack_type& def = defender.attacks()[choice.defender_stats_->attack_num];
choice.simulate(prev_def);
int simple_rating = static_cast<int>(
choice.defender_stats_->num_blows * choice.defender_stats_->damage * choice.defender_stats_->chance_to_hit * def.defense_weight());
//FIXME: make sure there is no mostake in the better_combat call-
if(simple_rating >= min_rating && (!best_choice || choice.better_defense(*best_choice, 1.0))) {
best_choice = &choice;
}
}
return best_choice ? std::move(*best_choice) : no_weapon();
}
// ==================================================================================
// HELPERS
// ==================================================================================
namespace
{
void refresh_weapon_index(int& weap_index, const std::string& weap_id, attack_itors attacks)
{
// No attacks to choose from.
if(attacks.empty()) {
weap_index = -1;
return;
}
// The currently selected attack fits.
if(weap_index >= 0 && weap_index < static_cast<int>(attacks.size()) && attacks[weap_index].id() == weap_id) {
return;
}
// Look up the weapon by id.
if(!weap_id.empty()) {
for(int i = 0; i < static_cast<int>(attacks.size()); ++i) {
if(attacks[i].id() == weap_id) {
weap_index = i;
return;
}
}
}
// Lookup has failed.
weap_index = -1;
return;
}
/** Helper class for performing an attack. */
class attack
{
public:
attack(const map_location& attacker,
const map_location& defender,
int attack_with,
int defend_with,
bool update_display = true);
void perform();
private:
class attack_end_exception
{
};
bool perform_hit(bool, statistics::attack_context&);
void fire_event(const std::string& n);
void refresh_bc();
/** Structure holding unit info used in the attack action. */
struct unit_info
{
const map_location loc_;
int weapon_;
unit_map& units_;
std::size_t id_; /**< unit.underlying_id() */
std::string weap_id_;
int orig_attacks_;
int n_attacks_; /**< Number of attacks left. */
int cth_;
int damage_;
int xp_;
unit_info(const map_location& loc, int weapon, unit_map& units);
unit& get_unit();
bool valid();
std::string dump();
};
/**
* Used in perform_hit to confirm a replay is in sync.
* Check OOS_error_ after this method, true if error detected.
*/
void check_replay_attack_result(bool&, int, int&, config, unit_info&);
void unit_killed(
unit_info&, unit_info&, const battle_context_unit_stats*&, const battle_context_unit_stats*&, bool);
std::unique_ptr<battle_context> bc_;
const battle_context_unit_stats* a_stats_;
const battle_context_unit_stats* d_stats_;
int abs_n_attack_, abs_n_defend_;
// update_att_fog_ is not used, other than making some code simpler.
bool update_att_fog_, update_def_fog_, update_minimap_;
unit_info a_, d_;
unit_map& units_;
std::ostringstream errbuf_;
bool update_display_;
bool OOS_error_;
bool use_prng_;
std::vector<bool> prng_attacker_;
std::vector<bool> prng_defender_;
};
attack::unit_info::unit_info(const map_location& loc, int weapon, unit_map& units)
: loc_(loc)
, weapon_(weapon)
, units_(units)
, id_()
, weap_id_()
, orig_attacks_(0)
, n_attacks_(0)
, cth_(0)
, damage_(0)
, xp_(0)
{
unit_map::iterator i = units_.find(loc_);
if(!i.valid()) {
return;
}
id_ = i->underlying_id();
}
unit& attack::unit_info::get_unit()
{
unit_map::iterator i = units_.find(loc_);
assert(i.valid() && i->underlying_id() == id_);
return *i;
}
bool attack::unit_info::valid()
{
unit_map::iterator i = units_.find(loc_);
return i.valid() && i->underlying_id() == id_;
}
std::string attack::unit_info::dump()
{
std::stringstream s;
s << get_unit().type_id() << " (" << loc_.wml_x() << ',' << loc_.wml_y() << ')';
return s.str();
}
attack::attack(const map_location& attacker,
const map_location& defender,
int attack_with,
int defend_with,
bool update_display)
: bc_(nullptr)
, a_stats_(nullptr)
, d_stats_(nullptr)
, abs_n_attack_(0)
, abs_n_defend_(0)
, update_att_fog_(false)
, update_def_fog_(false)
, update_minimap_(false)
, a_(attacker, attack_with, resources::gameboard->units())
, d_(defender, defend_with, resources::gameboard->units())
, units_(resources::gameboard->units())
, errbuf_()
, update_display_(update_display)
, OOS_error_(false)
//new experimental prng mode.
, use_prng_(preferences::get("use_prng") == "yes" && randomness::generator->is_networked() == false)
{
if(use_prng_) {
std::cerr << "Using experimental PRNG for combat\n";
}
}
void attack::fire_event(const std::string& n)
{
LOG_NG << "attack: firing '" << n << "' event\n";
// prepare the event data for weapon filtering
config ev_data;
config& a_weapon_cfg = ev_data.add_child("first");
config& d_weapon_cfg = ev_data.add_child("second");
// Need these to ensure weapon filters work correctly
boost::optional<attack_type::specials_context_t> a_ctx, d_ctx;
if(a_stats_->weapon != nullptr && a_.valid()) {
if(d_stats_->weapon != nullptr && d_.valid()) {
a_ctx.emplace(a_stats_->weapon->specials_context(nullptr, nullptr, a_.loc_, d_.loc_, true, d_stats_->weapon));
} else {
a_ctx.emplace(a_stats_->weapon->specials_context(nullptr, a_.loc_, true));
}
a_stats_->weapon->write(a_weapon_cfg);
}
if(d_stats_->weapon != nullptr && d_.valid()) {
if(a_stats_->weapon != nullptr && a_.valid()) {
d_ctx.emplace(d_stats_->weapon->specials_context(nullptr, nullptr, d_.loc_, a_.loc_, false, a_stats_->weapon));
} else {
d_ctx.emplace(d_stats_->weapon->specials_context(nullptr, d_.loc_, false));
}
d_stats_->weapon->write(d_weapon_cfg);
}
if(a_weapon_cfg["name"].empty()) {
a_weapon_cfg["name"] = "none";
}
if(d_weapon_cfg["name"].empty()) {
d_weapon_cfg["name"] = "none";
}
if(n == "attack_end") {
// We want to fire attack_end event in any case! Even if one of units was removed by WML.
resources::game_events->pump().fire(n, a_.loc_, d_.loc_, ev_data);
return;
}
// damage_inflicted is set in these two events.
// TODO: should we set this value from unit_info::damage, or continue using the WML variable?
if(n == "attacker_hits" || n == "defender_hits") {
ev_data["damage_inflicted"] = resources::gamedata->get_variable("damage_inflicted");
}
const int defender_side = d_.get_unit().side();
bool wml_aborted;
std::tie(std::ignore, wml_aborted) = resources::game_events->pump().fire(n,
game_events::entity_location(a_.loc_, a_.id_),
game_events::entity_location(d_.loc_, d_.id_), ev_data);
// The event could have killed either the attacker or
// defender, so we have to make sure they still exist.
refresh_bc();
if(wml_aborted || !a_.valid() || !d_.valid()
|| !resources::gameboard->get_team(a_.get_unit().side()).is_enemy(d_.get_unit().side())
) {
actions::recalculate_fog(defender_side);
if(update_display_) {
display::get_singleton()->redraw_minimap();
}
fire_event("attack_end");
throw attack_end_exception();
}
}
void attack::refresh_bc()
{
// Fix index of weapons.
if(a_.valid()) {
refresh_weapon_index(a_.weapon_, a_.weap_id_, a_.get_unit().attacks());
}
if(d_.valid()) {
refresh_weapon_index(d_.weapon_, d_.weap_id_, d_.get_unit().attacks());
}
if(!a_.valid() || !d_.valid()) {
// Fix pointer to weapons.
const_cast<battle_context_unit_stats*>(a_stats_)->weapon
= a_.valid() && a_.weapon_ >= 0 ? a_.get_unit().attacks()[a_.weapon_].shared_from_this() : nullptr;
const_cast<battle_context_unit_stats*>(d_stats_)->weapon
= d_.valid() && d_.weapon_ >= 0 ? d_.get_unit().attacks()[d_.weapon_].shared_from_this() : nullptr;
return;
}
bc_.reset(new battle_context(units_, a_.loc_, d_.loc_, a_.weapon_, d_.weapon_));
a_stats_ = &bc_->get_attacker_stats();
d_stats_ = &bc_->get_defender_stats();
a_.cth_ = a_stats_->chance_to_hit;
d_.cth_ = d_stats_->chance_to_hit;
a_.damage_ = a_stats_->damage;
d_.damage_ = d_stats_->damage;
}
bool attack::perform_hit(bool attacker_turn, statistics::attack_context& stats)
{
unit_info& attacker = attacker_turn ? a_ : d_;
unit_info& defender = attacker_turn ? d_ : a_;
// NOTE: we need to use a reference-to-pointer here so a_stats_ and d_stats_ can be
// modified without. Using a pointer directly would render them invalid when that happened.
const battle_context_unit_stats*& attacker_stats = attacker_turn ? a_stats_ : d_stats_;
const battle_context_unit_stats*& defender_stats = attacker_turn ? d_stats_ : a_stats_;
int& abs_n = attacker_turn ? abs_n_attack_ : abs_n_defend_;
bool& update_fog = attacker_turn ? update_def_fog_ : update_att_fog_;
int ran_num;
if(use_prng_) {
std::vector<bool>& prng_seq = attacker_turn ? prng_attacker_ : prng_defender_;
if(prng_seq.empty()) {
const int ntotal = attacker.cth_*attacker.n_attacks_;
int num_hits = ntotal/100;
const int additional_hit_chance = ntotal%100;
if(additional_hit_chance > 0 && randomness::generator->get_random_int(0, 99) < additional_hit_chance) {
++num_hits;
}
std::vector<int> indexes;
for(int i = 0; i != attacker.n_attacks_; ++i) {
prng_seq.push_back(false);
indexes.push_back(i);
}
for(int i = 0; i != num_hits; ++i) {
int n = randomness::generator->get_random_int(0, static_cast<int>(indexes.size())-1);
prng_seq[indexes[n]] = true;
indexes.erase(indexes.begin() + n);
}
}