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/* $Id$ */
/*
* 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 newgrf_cargo.cpp Implementation of NewGRF cargoes. */
#include "stdafx.h"
#include "debug.h"
#include "newgrf_spritegroup.h"
/** Resolver of cargo. */
struct CargoResolverObject : public ResolverObject {
CargoResolverObject(const CargoSpec *cs, CallbackID callback = CBID_NO_CALLBACK, uint32 callback_param1 = 0, uint32 callback_param2 = 0);
/* virtual */ const SpriteGroup *ResolveReal(const RealSpriteGroup *group) const;
};
/* virtual */ const SpriteGroup *CargoResolverObject::ResolveReal(const RealSpriteGroup *group) const
{
/* Cargo action 2s should always have only 1 "loaded" state, but some
* times things don't follow the spec... */
if (group->num_loaded > 0) return group->loaded[0];
if (group->num_loading > 0) return group->loading[0];
return NULL;
}
/**
* Constructor of the cargo resolver.
* @param cs Cargo being resolved.
* @param callback Callback ID.
* @param callback_param1 First parameter (var 10) of the callback.
* @param callback_param2 Second parameter (var 18) of the callback.
*/
CargoResolverObject::CargoResolverObject(const CargoSpec *cs, CallbackID callback, uint32 callback_param1, uint32 callback_param2)
: ResolverObject(cs->grffile, callback, callback_param1, callback_param2)
{
}
/**
* Get the custom sprite for the given cargo type.
* @param cs Cargo being queried.
* @return Custom sprite to draw, or \c 0 if not available.
*/
SpriteID GetCustomCargoSprite(const CargoSpec *cs)
{
CargoResolverObject object(cs);
const SpriteGroup *group = SpriteGroup::Resolve(cs->group, object);
if (group == NULL) return 0;
return group->GetResult();
}
uint16 GetCargoCallback(CallbackID callback, uint32 param1, uint32 param2, const CargoSpec *cs)
{
CargoResolverObject object(cs, callback, param1, param2);
const SpriteGroup *group = SpriteGroup::Resolve(cs->group, object);
if (group == NULL) return CALLBACK_FAILED;
return group->GetCallbackResult();
}
/**
* Translate a GRF-local cargo slot/bitnum into a CargoID.
* @param cargo GRF-local cargo slot/bitnum.
* @param grffile Originating GRF file.
* @param usebit Defines the meaning of \a cargo for GRF version < 7.
* If true, then \a cargo is a bitnum. If false, then \a cargo is a cargoslot.
* For GRF version >= 7 \a cargo is always a translated cargo bit.
* @return CargoID or CT_INVALID if the cargo is not available.
*/
CargoID GetCargoTranslation(uint8 cargo, const GRFFile *grffile, bool usebit)
{
/* Pre-version 7 uses the 'climate dependent' ID in callbacks and properties, i.e. cargo is the cargo ID */
if (grffile->grf_version < 7 && !usebit) return cargo;
/* Other cases use (possibly translated) cargobits */
if (grffile->cargo_list.Length() > 0) {
/* ...and the cargo is in bounds, then get the cargo ID for
* the label */
if (cargo < grffile->cargo_list.Length()) return GetCargoIDByLabel(grffile->cargo_list[cargo]);
} else {
/* Else the cargo value is a 'climate independent' 'bitnum' */
return GetCargoIDByBitnum(cargo);
}
return CT_INVALID;
}
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