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/*
* 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"
#include "safeguards.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 = nullptr;
if (IsRailDepotTile(this->tile)) {
t = Depot::GetByTile(this->tile)->town;
} else if (IsLevelCrossingTile(this->tile)) {
t = ClosestTownFromTile(this->tile, UINT_MAX);
}
return t != nullptr ? GetTownRadiusGroup(t, this->tile) : HZB_TOWN_EDGE;
}
}
Debug(grf, 1, "Unhandled rail type tile variable 0x{:X}", variable);
*available = false;
return UINT_MAX;
}
GrfSpecFeature RailTypeResolverObject::GetFeature() const
{
return GSF_RAILTYPES;
}
uint32 RailTypeResolverObject::GetDebugID() const
{
return this->railtype_scope.rti->label;
}
/**
* Resolver object for rail types.
* @param rti Railtype. nullptr in NewGRF Inspect window.
* @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 rtsg Railpart of interest
* @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(const RailtypeInfo *rti, TileIndex tile, TileContext context, RailTypeSpriteGroup rtsg, uint32 param1, uint32 param2)
: ResolverObject(rti != nullptr ? rti->grffile[rtsg] : nullptr, CBID_NO_CALLBACK, param1, param2), railtype_scope(*this, rti, tile, context)
{
this->root_spritegroup = rti != nullptr ? rti->group[rtsg] : nullptr;
}
/**
* 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 context Where are we drawing the tile?
* @param[out] num_results If not nullptr, return the number of sprites in the spriteset.
* @return The sprite to draw.
*/
SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg, TileContext context, uint *num_results)
{
assert(rtsg < RTSG_END);
if (rti->group[rtsg] == nullptr) return 0;
RailTypeResolverObject object(rti, tile, context, rtsg);
const SpriteGroup *group = object.Resolve();
if (group == nullptr || group->GetNumResults() == 0) return 0;
if (num_results) *num_results = group->GetNumResults();
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] == nullptr) return 0;
uint32 param1 = gui ? 0x10 : 0x00;
uint32 param2 = (type << 16) | (var << 8) | state;
RailTypeResolverObject object(rti, tile, TCX_NORMAL, RTSG_SIGNALS, param1, param2);
const SpriteGroup *group = object.Resolve();
if (group == nullptr || group->GetNumResults() == 0) return 0;
return group->GetResult();
}
/**
* Translate an index to the GRF-local railtype-translation table into a RailType.
* @param railtype Index into GRF-local translation table.
* @param grffile Originating GRF file.
* @return RailType or INVALID_RAILTYPE if the railtype is unknown.
*/
RailType GetRailTypeTranslation(uint8 railtype, const GRFFile *grffile)
{
if (grffile == nullptr || grffile->railtype_list.size() == 0) {
/* No railtype table present. Return railtype as-is (if valid), so it works for original railtypes. */
if (railtype >= RAILTYPE_END || GetRailTypeInfo(static_cast<RailType>(railtype))->label == 0) return INVALID_RAILTYPE;
return static_cast<RailType>(railtype);
} else {
/* Railtype table present, but invalid index, return invalid type. */
if (railtype >= grffile->railtype_list.size()) return INVALID_RAILTYPE;
/* Look up railtype including alternate labels. */
return GetRailTypeByLabel(grffile->railtype_list[railtype]);
}
}
/**
* 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 == nullptr || grffile->railtype_list.size() == 0) return railtype;
/* Look for a matching rail type label in the table */
RailTypeLabel label = GetRailTypeInfo(railtype)->label;
int idx = find_index(grffile->railtype_list, label);
if (idx >= 0) return idx;
/* If not found, return as invalid */
return 0xFF;
}
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