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/* $Id$ */
/** @file newgrf_railtype.cpp NewGRF handling of rail types. */
#include "stdafx.h"
#include "openttd.h"
#include "variables.h"
#include "debug.h"
#include "strings_type.h"
#include "rail.h"
#include "road_map.h"
#include "newgrf.h"
#include "newgrf_callbacks.h"
#include "newgrf_commons.h"
#include "newgrf_railtype.h"
#include "newgrf_spritegroup.h"
#include "core/bitmath_func.hpp"
static uint32 RailTypeGetRandomBits(const ResolverObject *object)
{
TileIndex tile = object->u.routes.tile;
uint tmp = CountBits(tile + (TileX(tile) + TileY(tile)) * TILE_SIZE);
return GB(tmp, 0, 2);
}
static uint32 RailTypeGetTriggers(const ResolverObject *object)
{
return 0;
}
static void RailTypeSetTriggers(const ResolverObject *object, int triggers)
{
}
static uint32 RailTypeGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
{
TileIndex tile = object->u.routes.tile;
if (tile == INVALID_TILE) {
switch (variable) {
case 0x40: return 0;
case 0x41: return 0;
case 0x42: return 0;
}
}
switch (variable) {
case 0x40: return GetTerrainType(tile);
case 0x41: return 0;
case 0x42: return IsLevelCrossingTile(tile) && IsCrossingBarred(tile);
}
DEBUG(grf, 1, "Unhandled rail type tile property 0x%X", variable);
*available = false;
return UINT_MAX;
}
static const SpriteGroup *RailTypeResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
{
if (group->num_loading > 0) return group->loading[0];
if (group->num_loaded > 0) return group->loaded[0];
return NULL;
}
static inline void NewRailTypeResolver(ResolverObject *res, TileIndex tile)
{
res->GetRandomBits = &RailTypeGetRandomBits;
res->GetTriggers = &RailTypeGetTriggers;
res->SetTriggers = &RailTypeSetTriggers;
res->GetVariable = &RailTypeGetVariable;
res->ResolveReal = &RailTypeResolveReal;
res->u.routes.tile = tile;
res->callback = CBID_NO_CALLBACK;
res->callback_param1 = 0;
res->callback_param2 = 0;
res->last_value = 0;
res->trigger = 0;
res->reseed = 0;
res->count = 0;
}
SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg)
{
assert(rtsg < RTSG_END);
if (rti->group[rtsg] == NULL) return 0;
const SpriteGroup *group;
ResolverObject object;
NewRailTypeResolver(&object, tile);
group = SpriteGroup::Resolve(rti->group[rtsg], &object);
if (group == NULL || group->GetNumResults() == 0) return 0;
return group->GetResult();
}
uint8 GetReverseRailTypeTranslation(RailType railtype, const GRFFile *grffile)
{
/* No rail type table present, return rail type as-is */
if (grffile->railtype_max == 0) return railtype;
/* Look for a matching rail type label in the table */
RailTypeLabel label = GetRailTypeInfo(railtype)->label;
for (uint i = 0; i < grffile->railtype_max; i++) {
if (label == grffile->railtype_list[i]) return i;
}
/* If not found, return as invalid */
return 0xFF;
}
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