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Peter Nelson

Feature: Randomize direction of rail vehicle on build based on probability callback. (#11489)

This allows NewGRF authors to indicate that the game should randomly flip rail vehicles on build, without needing to use random bits nor duplicate sprites to handle it themselves.

To use this functionality, test for callback 162 (CBID_VEHICLE_BUILD_PROBABILITY) and var10 = 0 (values other than 0 are reserved for future use), and return a value between 0 and 100 inclusive.

The return value is a percentage chance of reversing the vehicle. A value of 0 will always build a forward facing vehicle, and 100 will always build a reverse facing vehicle.

/*
 * 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 signs_base.h Base class for signs. */

#ifndef SIGNS_BASE_H
#define SIGNS_BASE_H

#include "signs_type.h"
#include "viewport_type.h"
#include "core/pool_type.hpp"
#include "company_type.h"

typedef Pool<Sign, SignID, 16, 64000> SignPool;
extern SignPool _sign_pool;

struct Sign : SignPool::PoolItem<&_sign_pool> {
	std::string         name;
	TrackedViewportSign sign;
	int32_t               x;
	int32_t               y;
	int32_t               z;
	Owner               owner; // placed by this company. Anyone can delete them though. OWNER_NONE for gray signs from old games.

	Sign(Owner owner = INVALID_OWNER);
	~Sign();

	void UpdateVirtCoord();
};

#endif /* SIGNS_BASE_H */