146 lines
4.5 KiB
C++
146 lines
4.5 KiB
C++
/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file newgrf_railtype.cpp NewGRF handling of rail types. */
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#include "stdafx.h"
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#include "debug.h"
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#include "newgrf.h"
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#include "newgrf_spritegroup.h"
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#include "date_func.h"
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#include "depot_base.h"
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static uint32 RailTypeGetRandomBits(const ResolverObject *object)
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{
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TileIndex tile = object->u.routes.tile;
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uint tmp = CountBits(tile + (TileX(tile) + TileY(tile)) * TILE_SIZE);
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return GB(tmp, 0, 2);
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}
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static uint32 RailTypeGetTriggers(const ResolverObject *object)
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{
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return 0;
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}
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static void RailTypeSetTriggers(const ResolverObject *object, int triggers)
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{
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}
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static uint32 RailTypeGetVariable(const ResolverObject *object, byte variable, uint32 parameter, bool *available)
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{
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TileIndex tile = object->u.routes.tile;
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if (tile == INVALID_TILE) {
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switch (variable) {
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case 0x40: return 0;
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case 0x41: return 0;
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case 0x42: return 0;
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case 0x43: return _date;
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}
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}
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switch (variable) {
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case 0x40: return GetTerrainType(tile, object->u.routes.context);
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case 0x41: return 0;
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case 0x42: return IsLevelCrossingTile(tile) && IsCrossingBarred(tile);
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case 0x43:
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if (IsRailDepotTile(tile)) return Depot::GetByTile(tile)->build_date;
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return _date;
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}
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DEBUG(grf, 1, "Unhandled rail type tile variable 0x%X", variable);
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*available = false;
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return UINT_MAX;
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}
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static const SpriteGroup *RailTypeResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
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{
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if (group->num_loading > 0) return group->loading[0];
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if (group->num_loaded > 0) return group->loaded[0];
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return NULL;
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}
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static inline void NewRailTypeResolver(ResolverObject *res, TileIndex tile, TileContext context, const GRFFile *grffile)
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{
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res->GetRandomBits = &RailTypeGetRandomBits;
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res->GetTriggers = &RailTypeGetTriggers;
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res->SetTriggers = &RailTypeSetTriggers;
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res->GetVariable = &RailTypeGetVariable;
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res->ResolveReal = &RailTypeResolveReal;
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res->u.routes.tile = tile;
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res->u.routes.context = context;
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res->callback = CBID_NO_CALLBACK;
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res->callback_param1 = 0;
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res->callback_param2 = 0;
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res->ResetState();
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res->grffile = grffile;
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}
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/**
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* Get the sprite to draw for the given tile.
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* @param rti The rail type data (spec).
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* @param tile The tile to get the sprite for.
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* @param rtsg The type of sprite to draw.
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* @param content Where are we drawing the tile?
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* @return The sprite to draw.
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*/
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SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg, TileContext context)
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{
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assert(rtsg < RTSG_END);
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if (rti->group[rtsg] == NULL) return 0;
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const SpriteGroup *group;
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ResolverObject object;
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NewRailTypeResolver(&object, tile, context, rti->grffile[rtsg]);
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group = SpriteGroup::Resolve(rti->group[rtsg], &object);
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if (group == NULL || group->GetNumResults() == 0) return 0;
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return group->GetResult();
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}
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/**
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* Perform a reverse railtype lookup to get the GRF internal ID.
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* @param railtype The global (OpenTTD) railtype.
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* @param grffile The GRF to do the lookup for.
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* @return the GRF internal ID.
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*/
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uint8 GetReverseRailTypeTranslation(RailType railtype, const GRFFile *grffile)
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{
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/* No rail type table present, return rail type as-is */
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if (grffile == NULL || grffile->railtype_max == 0) return railtype;
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/* Look for a matching rail type label in the table */
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RailTypeLabel label = GetRailTypeInfo(railtype)->label;
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for (uint i = 0; i < grffile->railtype_max; i++) {
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if (label == grffile->railtype_list[i]) return i;
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}
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/* If not found, return as invalid */
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return 0xFF;
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}
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/**
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* Resolve a railtypes's spec and such so we can get a variable.
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* @param ro The resolver object to fill.
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* @param index The rail tile to get the data from.
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*/
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void GetRailTypeResolver(ResolverObject *ro, uint index)
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{
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/* There is no unique GRFFile for the tile. Multiple GRFs can define different parts of the railtype.
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* However, currently the NewGRF Debug GUI does not display variables depending on the GRF (like 0x7F) anyway. */
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NewRailTypeResolver(ro, index, TCX_NORMAL, NULL);
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}
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