Files @ r24835:3784c0862167
Branch filter:

Location: cpp/openttd-patchpack/source/src/linkgraph/refresh.cpp - annotation

Patric Stout
Change: sleep till the next tick in the main loop

Sleep for 1ms (which is always (a lot) more than 1ms) is just
randomly guessing and hoping you hit your deadline, give or take.

But given we can calculate when our next frame is happening, we
can just sleep for that exact amount. As these values are often
a bit larger, it is also more likely the OS can schedule us back
in close to our requested target. This means it is more likely we
hit our deadlines, which makes the FPS a lot more stable.
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/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file refresh.h Definition of link refreshing utility. */

#include "../stdafx.h"
#include "../core/bitmath_func.hpp"
#include "../station_func.h"
#include "../engine_base.h"
#include "../vehicle_func.h"
#include "refresh.h"
#include "linkgraph.h"

#include "../safeguards.h"

/**
 * Refresh all links the given vehicle will visit.
 * @param v Vehicle to refresh links for.
 * @param allow_merge If the refresher is allowed to merge or extend link graphs.
 * @param is_full_loading If the vehicle is full loading.
 */
/* static */ void LinkRefresher::Run(Vehicle *v, bool allow_merge, bool is_full_loading)
{
	/* If there are no orders we can't predict anything.*/
	if (v->orders.list == nullptr) return;

	/* Make sure the first order is a useful order. */
	const Order *first = v->orders.list->GetNextDecisionNode(v->GetOrder(v->cur_implicit_order_index), 0);
	if (first == nullptr) return;

	HopSet seen_hops;
	LinkRefresher refresher(v, &seen_hops, allow_merge, is_full_loading);

	refresher.RefreshLinks(first, first, v->last_loading_station != INVALID_STATION ? 1 << HAS_CARGO : 0);
}

/**
 * Comparison operator to allow hops to be used in a std::set.
 * @param other Other hop to be compared with.
 * @return If this hop is "smaller" than the other (defined by from, to and cargo in this order).
 */
bool LinkRefresher::Hop::operator<(const Hop &other) const
{
	if (this->from < other.from) {
		return true;
	} else if (this->from > other.from) {
		return false;
	}
	if (this->to < other.to) {
		return true;
	} else if (this->to > other.to) {
		return false;
	}
	return this->cargo < other.cargo;
}

/**
 * Constructor for link refreshing algorithm.
 * @param vehicle Vehicle to refresh links for.
 * @param seen_hops Set of hops already seen. This is shared between this
 *                  refresher and all its children.
 * @param allow_merge If the refresher is allowed to merge or extend link graphs.
 * @param is_full_loading If the vehicle is full loading.
 */
LinkRefresher::LinkRefresher(Vehicle *vehicle, HopSet *seen_hops, bool allow_merge, bool is_full_loading) :
	vehicle(vehicle), seen_hops(seen_hops), cargo(CT_INVALID), allow_merge(allow_merge),
	is_full_loading(is_full_loading)
{
	memset(this->capacities, 0, sizeof(this->capacities));

	/* Assemble list of capacities and set last loading stations to 0. */
	for (Vehicle *v = this->vehicle; v != nullptr; v = v->Next()) {
		this->refit_capacities.push_back(RefitDesc(v->cargo_type, v->cargo_cap, v->refit_cap));
		if (v->refit_cap > 0) {
			assert(v->cargo_type < NUM_CARGO);
			this->capacities[v->cargo_type] += v->refit_cap;
		}
	}
}

/**
 * Handle refit orders by updating capacities and refit_capacities.
 * @param refit_cargo Cargo to refit to.
 * @return True if any vehicle was refit; false if none was.
 */
bool LinkRefresher::HandleRefit(CargoID refit_cargo)
{
	this->cargo = refit_cargo;
	RefitList::iterator refit_it = this->refit_capacities.begin();
	bool any_refit = false;
	for (Vehicle *v = this->vehicle; v != nullptr; v = v->Next()) {
		const Engine *e = Engine::Get(v->engine_type);
		if (!HasBit(e->info.refit_mask, this->cargo)) {
			++refit_it;
			continue;
		}
		any_refit = true;

		/* Back up the vehicle's cargo type */
		CargoID temp_cid = v->cargo_type;
		byte temp_subtype = v->cargo_subtype;
		v->cargo_type = this->cargo;
		v->cargo_subtype = GetBestFittingSubType(v, v, this->cargo);

		uint16 mail_capacity = 0;
		uint amount = e->DetermineCapacity(v, &mail_capacity);

		/* Restore the original cargo type */
		v->cargo_type = temp_cid;
		v->cargo_subtype = temp_subtype;

		/* Skip on next refit. */
		if (this->cargo != refit_it->cargo && refit_it->remaining > 0) {
			this->capacities[refit_it->cargo] -= refit_it->remaining;
			refit_it->remaining = 0;
		} else if (amount < refit_it->remaining) {
			this->capacities[refit_it->cargo] -= refit_it->remaining - amount;
			refit_it->remaining = amount;
		}
		refit_it->capacity = amount;
		refit_it->cargo = this->cargo;

		++refit_it;

		/* Special case for aircraft with mail. */
		if (v->type == VEH_AIRCRAFT) {
			if (mail_capacity < refit_it->remaining) {
				this->capacities[refit_it->cargo] -= refit_it->remaining - mail_capacity;
				refit_it->remaining = mail_capacity;
			}
			refit_it->capacity = mail_capacity;
			break; // aircraft have only one vehicle
		}
	}
	return any_refit;
}

/**
 * Restore capacities and refit_capacities as vehicle might have been able to load now.
 */
void LinkRefresher::ResetRefit()
{
	for (RefitList::iterator it(this->refit_capacities.begin()); it != this->refit_capacities.end(); ++it) {
		if (it->remaining == it->capacity) continue;
		this->capacities[it->cargo] += it->capacity - it->remaining;
		it->remaining = it->capacity;
	}
}

/**
 * Predict the next order the vehicle will execute and resolve conditionals by
 * recursion and return next non-conditional order in list.
 * @param cur Current order being evaluated.
 * @param next Next order to be evaluated.
 * @param flags RefreshFlags to give hints about the previous link and state carried over from that.
 * @param num_hops Number of hops already taken by recursive calls to this method.
 * @return new next Order.
 */
const Order *LinkRefresher::PredictNextOrder(const Order *cur, const Order *next, uint8 flags, uint num_hops)
{
	/* next is good if it's either nullptr (then the caller will stop the
	 * evaluation) or if it's not conditional and the caller allows it to be
	 * chosen (by setting USE_NEXT). */
	while (next != nullptr && (!HasBit(flags, USE_NEXT) || next->IsType(OT_CONDITIONAL))) {

		/* After the first step any further non-conditional order is good,
		 * regardless of previous USE_NEXT settings. The case of cur and next or
		 * their respective stations being equal is handled elsewhere. */
		SetBit(flags, USE_NEXT);

		if (next->IsType(OT_CONDITIONAL)) {
			const Order *skip_to = this->vehicle->orders.list->GetNextDecisionNode(
					this->vehicle->orders.list->GetOrderAt(next->GetConditionSkipToOrder()), num_hops);
			if (skip_to != nullptr && num_hops < this->vehicle->orders.list->GetNumOrders()) {
				/* Make copies of capacity tracking lists. There is potential
				 * for optimization here: If the vehicle never refits we don't
				 * need to copy anything. Also, if we've seen the branched link
				 * before we don't need to branch at all. */
				LinkRefresher branch(*this);
				branch.RefreshLinks(cur, skip_to, flags, num_hops + 1);
			}
		}

		/* Reassign next with the following stop. This can be a station or a
		 * depot.*/
		next = this->vehicle->orders.list->GetNextDecisionNode(
				this->vehicle->orders.list->GetNext(next), num_hops++);
	}
	return next;
}

/**
 * Refresh link stats for the given pair of orders.
 * @param cur Last stop where the consist could interact with cargo.
 * @param next Next order to be processed.
 */
void LinkRefresher::RefreshStats(const Order *cur, const Order *next)
{
	StationID next_station = next->GetDestination();
	Station *st = Station::GetIfValid(cur->GetDestination());
	if (st != nullptr && next_station != INVALID_STATION && next_station != st->index) {
		for (CargoID c = 0; c < NUM_CARGO; c++) {
			/* Refresh the link and give it a minimum capacity. */

			uint cargo_quantity = this->capacities[c];
			if (cargo_quantity == 0) continue;

			/* If not allowed to merge link graphs, make sure the stations are
			 * already in the same link graph. */
			if (!this->allow_merge && st->goods[c].link_graph != Station::Get(next_station)->goods[c].link_graph) {
				continue;
			}

			/* A link is at least partly restricted if a vehicle can't load at its source. */
			EdgeUpdateMode restricted_mode = (cur->GetLoadType() & OLFB_NO_LOAD) == 0 ?
						EUM_UNRESTRICTED : EUM_RESTRICTED;

			/* If the vehicle is currently full loading, increase the capacities at the station
			 * where it is loading by an estimate of what it would have transported if it wasn't
			 * loading. Don't do that if the vehicle has been waiting for longer than the entire
			 * order list is supposed to take, though. If that is the case the total duration is
			 * probably far off and we'd greatly overestimate the capacity by increasing.*/
			if (this->is_full_loading && this->vehicle->orders.list != nullptr &&
					st->index == vehicle->last_station_visited &&
					this->vehicle->orders.list->GetTotalDuration() >
					(Ticks)this->vehicle->current_order_time) {
				uint effective_capacity = cargo_quantity * this->vehicle->load_unload_ticks;
				if (effective_capacity > (uint)this->vehicle->orders.list->GetTotalDuration()) {
					IncreaseStats(st, c, next_station, effective_capacity /
							this->vehicle->orders.list->GetTotalDuration(), 0,
							EUM_INCREASE | restricted_mode);
				} else if (RandomRange(this->vehicle->orders.list->GetTotalDuration()) < effective_capacity) {
					IncreaseStats(st, c, next_station, 1, 0, EUM_INCREASE | restricted_mode);
				} else {
					IncreaseStats(st, c, next_station, cargo_quantity, 0, EUM_REFRESH | restricted_mode);
				}
			} else {
				IncreaseStats(st, c, next_station, cargo_quantity, 0, EUM_REFRESH | restricted_mode);
			}
		}
	}
}

/**
 * Iterate over orders starting at \a cur and \a next and refresh links
 * associated with them. \a cur and \a next can be equal. If they're not they
 * must be "neighbours" in their order list, which means \a next must be directly
 * reachable from \a cur without passing any further OT_GOTO_STATION or
 * OT_IMPLICIT orders in between.
 * @param cur Current order being evaluated.
 * @param next Next order to be checked.
 * @param flags RefreshFlags to give hints about the previous link and state carried over from that.
 * @param num_hops Number of hops already taken by recursive calls to this method.
 */
void LinkRefresher::RefreshLinks(const Order *cur, const Order *next, uint8 flags, uint num_hops)
{
	while (next != nullptr) {

		if ((next->IsType(OT_GOTO_DEPOT) || next->IsType(OT_GOTO_STATION)) && next->IsRefit()) {
			SetBit(flags, WAS_REFIT);
			if (!next->IsAutoRefit()) {
				this->HandleRefit(next->GetRefitCargo());
			} else if (!HasBit(flags, IN_AUTOREFIT)) {
				SetBit(flags, IN_AUTOREFIT);
				LinkRefresher backup(*this);
				for (CargoID c = 0; c != NUM_CARGO; ++c) {
					if (CargoSpec::Get(c)->IsValid() && this->HandleRefit(c)) {
						this->RefreshLinks(cur, next, flags, num_hops);
						*this = backup;
					}
				}
			}
		}

		/* Only reset the refit capacities if the "previous" next is a station,
		 * meaning that either the vehicle was refit at the previous station or
		 * it wasn't at all refit during the current hop. */
		if (HasBit(flags, WAS_REFIT) && (next->IsType(OT_GOTO_STATION) || next->IsType(OT_IMPLICIT))) {
			SetBit(flags, RESET_REFIT);
		} else {
			ClrBit(flags, RESET_REFIT);
		}

		next = this->PredictNextOrder(cur, next, flags, num_hops);
		if (next == nullptr) break;
		Hop hop(cur->index, next->index, this->cargo);
		if (this->seen_hops->find(hop) != this->seen_hops->end()) {
			break;
		} else {
			this->seen_hops->insert(hop);
		}

		/* Don't use the same order again, but choose a new one in the next round. */
		ClrBit(flags, USE_NEXT);

		/* Skip resetting and link refreshing if next order won't do anything with cargo. */
		if (!next->IsType(OT_GOTO_STATION) && !next->IsType(OT_IMPLICIT)) continue;

		if (HasBit(flags, RESET_REFIT)) {
			this->ResetRefit();
			ClrBit(flags, RESET_REFIT);
			ClrBit(flags, WAS_REFIT);
		}

		if (cur->IsType(OT_GOTO_STATION) || cur->IsType(OT_IMPLICIT)) {
			if (cur->CanLeaveWithCargo(HasBit(flags, HAS_CARGO))) {
				SetBit(flags, HAS_CARGO);
				this->RefreshStats(cur, next);
			} else {
				ClrBit(flags, HAS_CARGO);
			}
		}

		/* "cur" is only assigned here if the stop is a station so that
		 * whenever stats are to be increased two stations can be found. */
		cur = next;
	}
}