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/* $Id$ */
/** @file newgrf_canal.cpp Implementation of NewGRF canals. */
#include "stdafx.h"
#include "core/overflowsafe_type.hpp"
#include "tile_type.h"
#include "debug.h"
#include "newgrf_commons.h"
#include "newgrf_spritegroup.h"
#include "newgrf_canal.h"
#include "tile_map.h"
#include "water_map.h"
/** Table of canal 'feature' sprite groups */
WaterFeature _water_feature[CF_END];
/* Random bits and triggers are not supported for canals, so the following
* three functions are stubs. */
static uint32 CanalGetRandomBits(const ResolverObject *object)
{
/* Return random bits only for water tiles, not station tiles */
return IsTileType(object->u.canal.tile, MP_WATER) ? GetWaterTileRandomBits(object->u.canal.tile) : 0;
}
static uint32 CanalGetTriggers(const ResolverObject *object)
{
return 0;
}
static void CanalSetTriggers(const ResolverObject *object, int triggers)
{
return;
}
static uint32 CanalGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
{
TileIndex tile = object->u.canal.tile;
switch (variable) {
/* Height of tile */
case 0x80: return GetTileZ(tile) / TILE_HEIGHT;
/* Terrain type */
case 0x81: return GetTerrainType(tile);
/* Random data for river or canal tiles, otherwise zero */
case 0x83: return GetWaterTileRandomBits(tile);
}
DEBUG(grf, 1, "Unhandled canal property 0x%02X", variable);
*available = false;
return UINT_MAX;
}
static const SpriteGroup *CanalResolveReal(const ResolverObject *object, const SpriteGroup *group)
{
if (group->g.real.num_loaded == 0) return NULL;
return group->g.real.loaded[0];
}
static void NewCanalResolver(ResolverObject *res, TileIndex tile, const GRFFile *grffile)
{
res->GetRandomBits = &CanalGetRandomBits;
res->GetTriggers = &CanalGetTriggers;
res->SetTriggers = &CanalSetTriggers;
res->GetVariable = &CanalGetVariable;
res->ResolveReal = &CanalResolveReal;
res->u.canal.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;
res->grffile = grffile;
}
SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)
{
ResolverObject object;
const SpriteGroup *group;
NewCanalResolver(&object, tile, _water_feature[feature].grffile);
group = Resolve(_water_feature[feature].group, &object);
if (group == NULL || group->type != SGT_RESULT) return 0;
return group->g.result.sprite;
}
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