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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_railtype.cpp NewGRF handling of rail types. */
#include "stdafx.h"
#include "debug.h"
#include "newgrf_railtype.h"
#include "date_func.h"
#include "depot_base.h"
#include "town.h"
/* virtual */ uint32 RailTypeScopeResolver::GetRandomBits() const
{
uint tmp = CountBits(this->tile + (TileX(this->tile) + TileY(this->tile)) * TILE_SIZE);
return GB(tmp, 0, 2);
}
/* virtual */ uint32 RailTypeScopeResolver::GetVariable(byte variable, uint32 parameter, bool *available) const
{
if (this->tile == INVALID_TILE) {
switch (variable) {
case 0x40: return 0;
case 0x41: return 0;
case 0x42: return 0;
case 0x43: return _date;
case 0x44: return HZB_TOWN_EDGE;
}
}
switch (variable) {
case 0x40: return GetTerrainType(this->tile, this->context);
case 0x41: return 0;
case 0x42: return IsLevelCrossingTile(this->tile) && IsCrossingBarred(this->tile);
case 0x43:
if (IsRailDepotTile(this->tile)) return Depot::GetByTile(this->tile)->build_date;
return _date;
case 0x44: {
const Town *t = NULL;
if (IsRailDepotTile(this->tile)) {
t = Depot::GetByTile(this->tile)->town;
} else if (IsLevelCrossingTile(this->tile)) {
t = ClosestTownFromTile(this->tile, UINT_MAX);
}
return t != NULL ? GetTownRadiusGroup(t, this->tile) : HZB_TOWN_EDGE;
}
}
DEBUG(grf, 1, "Unhandled rail type tile variable 0x%X", variable);
*available = false;
return UINT_MAX;
}
/* virtual */ const SpriteGroup *RailTypeResolverObject::ResolveReal(const RealSpriteGroup *group) const
{
if (group->num_loading > 0) return group->loading[0];
if (group->num_loaded > 0) return group->loaded[0];
return NULL;
}
/**
* Constructor of the railtype scope resolvers.
* @param ro Surrounding resolver.
* @param tile %Tile containing the track. For track on a bridge this is the southern bridgehead.
* @param context Are we resolving sprites for the upper halftile, or on a bridge?
*/
RailTypeScopeResolver::RailTypeScopeResolver(ResolverObject &ro, TileIndex tile, TileContext context) : ScopeResolver(ro)
{
this->tile = tile;
this->context = context;
}
/**
* Resolver object for rail types.
* @param tile %Tile containing the track. For track on a bridge this is the southern bridgehead.
* @param context Are we resolving sprites for the upper halftile, or on a bridge?
* @param grffile The GRF to do the lookup for.
* @param param1 Extra parameter (first parameter of the callback, except railtypes do not have callbacks).
* @param param2 Extra parameter (second parameter of the callback, except railtypes do not have callbacks).
*/
RailTypeResolverObject::RailTypeResolverObject(TileIndex tile, TileContext context, const GRFFile *grffile, uint32 param1, uint32 param2)
: ResolverObject(grffile, CBID_NO_CALLBACK, param1, param2), railtype_scope(*this, tile, context)
{
}
/**
* Get the sprite to draw for the given tile.
* @param rti The rail type data (spec).
* @param tile The tile to get the sprite for.
* @param rtsg The type of sprite to draw.
* @param content Where are we drawing the tile?
* @return The sprite to draw.
*/
SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg, TileContext context)
{
assert(rtsg < RTSG_END);
if (rti->group[rtsg] == NULL) return 0;
RailTypeResolverObject object(tile, context, rti->grffile[rtsg]);
const SpriteGroup *group = SpriteGroup::Resolve(rti->group[rtsg], object);
if (group == NULL || group->GetNumResults() == 0) return 0;
return group->GetResult();
}
/**
* Get the sprite to draw for a given signal.
* @param rti The rail type data (spec).
* @param tile The tile to get the sprite for.
* @param type Signal type.
* @param var Signal variant.
* @param state Signal state.
* @param gui Is the sprite being used on the map or in the GUI?
* @return The sprite to draw.
*/
SpriteID GetCustomSignalSprite(const RailtypeInfo *rti, TileIndex tile, SignalType type, SignalVariant var, SignalState state, bool gui)
{
if (rti->group[RTSG_SIGNALS] == NULL) return 0;
uint32 param1 = gui ? 0x10 : 0x00;
uint32 param2 = (type << 16) | (var << 8) | state;
RailTypeResolverObject object(tile, TCX_NORMAL, rti->grffile[RTSG_SIGNALS], param1, param2);
const SpriteGroup *group = SpriteGroup::Resolve(rti->group[RTSG_SIGNALS], object);
if (group == NULL || group->GetNumResults() == 0) return 0;
return group->GetResult();
}
/**
* Perform a reverse railtype lookup to get the GRF internal ID.
* @param railtype The global (OpenTTD) railtype.
* @param grffile The GRF to do the lookup for.
* @return the GRF internal ID.
*/
uint8 GetReverseRailTypeTranslation(RailType railtype, const GRFFile *grffile)
{
/* No rail type table present, return rail type as-is */
if (grffile == NULL || grffile->railtype_list.Length() == 0) return railtype;
/* Look for a matching rail type label in the table */
RailTypeLabel label = GetRailTypeInfo(railtype)->label;
int index = grffile->railtype_list.FindIndex(label);
if (index >= 0) return index;
/* If not found, return as invalid */
return 0xFF;
}
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