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/* $Id$ */

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#ifndef NEWGRF_CALLBACKS_H

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#define NEWGRF_CALLBACKS_H

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/** @file newgrf_callbacks.h

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 */

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// This enum lists the implemented callbacks

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// Use as argument for the GetCallBackResult function (see comments there)

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enum CallbackID {

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	// Powered wagons, if the result is lower as 0x40 then the wagon is powered

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	// TODO: interpret the rest of the result, aka "visual effects"

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	CBID_WAGON_POWER = 0x10,

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	// Vehicle length, returns the amount of 1/8's the vehicle is shorter

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	// only for train vehicles

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	CBID_VEH_LENGTH = 0x11,

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	// Refit capacity, the passed vehicle needs to have its ->cargo_type set to

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	// the cargo we are refitting to, returns the new cargo capacity

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	CBID_REFIT_CAP = 0x15,

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	CBID_ARTIC_ENGINE = 0x16,

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};

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// bit positions for rvi->callbackmask, indicates which callbacks are used by an engine

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// (some callbacks are always used, and dont appear here)

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enum CallbackMask {

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	CBM_WAGON_POWER = 0,

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	CBM_VEH_LENGTH = 1,

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	CBM_REFIT_CAP = 3,

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	CBM_ARTIC_ENGINE = 4,

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};

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enum {

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	CALLBACK_FAILED = 0xFFFF

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};

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#endif /* NEWGRF_CALLBACKS_H */