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PeterN

Feature: Industries with neutral stations (e.g. Oil Rig) only supply/accept cargo to/from their neutral station. (#7234)

This change is a controlled by a game setting, located under Environment ->
Industries which allows toggling the behaviour. It defaults to enabled.

"Company stations can serve industries with attached neutral stations"

When enabled, industries with attached neutral station (such as Oil Rigs) may
also be served by company-owned stations built nearby. This is the traditional
behaviour.

When disabled, these industries may only be served by their neutral station.
Any nearby company-owned stations won't be able to serve them, nor will the
neutral station serve anything else other than the industry.

/* $Id$ */

/*
 * 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 bridge.h Header file for bridges */

#ifndef BRIDGE_H
#define BRIDGE_H

#include "gfx_type.h"
#include "tile_cmd.h"

/**
 * This enum is related to the definition of bridge pieces,
 * which is used to determine the proper sprite table to use
 * while drawing a given bridge part.
 */
enum BridgePieces {
	BRIDGE_PIECE_NORTH = 0,
	BRIDGE_PIECE_SOUTH,
	BRIDGE_PIECE_INNER_NORTH,
	BRIDGE_PIECE_INNER_SOUTH,
	BRIDGE_PIECE_MIDDLE_ODD,
	BRIDGE_PIECE_MIDDLE_EVEN,
	BRIDGE_PIECE_HEAD,
	BRIDGE_PIECE_INVALID,
};

DECLARE_POSTFIX_INCREMENT(BridgePieces)

static const uint MAX_BRIDGES = 13; ///< Maximal number of available bridge specs.

typedef uint BridgeType; ///< Bridge spec number.

/**
 * Struct containing information about a single bridge type
 */
struct BridgeSpec {
	Year avail_year;             ///< the year where it becomes available
	byte min_length;             ///< the minimum length (not counting start and end tile)
	uint16 max_length;           ///< the maximum length (not counting start and end tile)
	uint16 price;                ///< the price multiplier
	uint16 speed;                ///< maximum travel speed (1 unit = 1/1.6 mph = 1 km-ish/h)
	SpriteID sprite;             ///< the sprite which is used in the GUI
	PaletteID pal;               ///< the palette which is used in the GUI
	StringID material;           ///< the string that contains the bridge description
	StringID transport_name[2];  ///< description of the bridge, when built for road or rail
	PalSpriteID **sprite_table;  ///< table of sprites for drawing the bridge
	byte flags;                  ///< bit 0 set: disable drawing of far pillars.
};

extern BridgeSpec _bridge[MAX_BRIDGES];

Foundation GetBridgeFoundation(Slope tileh, Axis axis);
bool HasBridgeFlatRamp(Slope tileh, Axis axis);

/**
 * Get the specification of a bridge type.
 * @param i The type of bridge to get the specification for.
 * @return The specification.
 */
static inline const BridgeSpec *GetBridgeSpec(BridgeType i)
{
	assert(i < lengthof(_bridge));
	return &_bridge[i];
}

void DrawBridgeMiddle(const TileInfo *ti);

CommandCost CheckBridgeAvailability(BridgeType bridge_type, uint bridge_len, DoCommandFlag flags = DC_NONE);
int CalcBridgeLenCostFactor(int x);

void ResetBridges();

#endif /* BRIDGE_H */