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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_canal.cpp Implementation of NewGRF canals. */
#include "stdafx.h"
#include "debug.h"
#include "newgrf_spritegroup.h"
#include "newgrf_canal.h"
#include "water.h"
#include "water_map.h"
#include "spritecache.h"
#include "safeguards.h"
/** Table of canal 'feature' sprite groups */
WaterFeature _water_feature[CF_END];
/** Scope resolver of a canal tile. */
struct CanalScopeResolver : public ScopeResolver {
TileIndex tile; ///< Tile containing the canal.
CanalScopeResolver(ResolverObject &ro, TileIndex tile)
: ScopeResolver(ro), tile(tile)
{
}
uint32 GetRandomBits() const override;
uint32 GetVariable(byte variable, uint32 parameter, bool *available) const override;
};
/** Resolver object for canals. */
struct CanalResolverObject : public ResolverObject {
CanalScopeResolver canal_scope;
CanalFeature feature;
CanalResolverObject(CanalFeature feature, TileIndex tile,
CallbackID callback = CBID_NO_CALLBACK, uint32 callback_param1 = 0, uint32 callback_param2 = 0);
ScopeResolver *GetScope(VarSpriteGroupScope scope = VSG_SCOPE_SELF, byte relative = 0) override
{
switch (scope) {
case VSG_SCOPE_SELF: return &this->canal_scope;
default: return ResolverObject::GetScope(scope, relative);
}
}
GrfSpecFeature GetFeature() const override;
uint32 GetDebugID() const override;
};
/* virtual */ uint32 CanalScopeResolver::GetRandomBits() const
{
/* Return random bits only for water tiles, not station tiles */
return IsTileType(this->tile, MP_WATER) ? GetWaterTileRandomBits(this->tile) : 0;
}
/* virtual */ uint32 CanalScopeResolver::GetVariable(byte variable, uint32 parameter, bool *available) const
{
switch (variable) {
/* Height of tile */
case 0x80: {
int z = GetTileZ(this->tile);
/* Return consistent height within locks */
if (IsTileType(this->tile, MP_WATER) && IsLock(this->tile) && GetLockPart(this->tile) == LOCK_PART_UPPER) z--;
return z;
}
/* Terrain type */
case 0x81: return GetTerrainType(this->tile);
/* Dike map: Connectivity info for river and canal tiles
*
* Assignment of bits to directions defined in agreement with
* http://projects.tt-forums.net/projects/ttdpatch/repository/revisions/2367/entry/trunk/patches/water.asm#L879
* 7
* 3 0
* 6 * 4
* 2 1
* 5
*/
case 0x82: {
uint32 connectivity =
(!IsWateredTile(TILE_ADDXY(tile, -1, 0), DIR_SW) << 0) // NE
+ (!IsWateredTile(TILE_ADDXY(tile, 0, 1), DIR_NW) << 1) // SE
+ (!IsWateredTile(TILE_ADDXY(tile, 1, 0), DIR_NE) << 2) // SW
+ (!IsWateredTile(TILE_ADDXY(tile, 0, -1), DIR_SE) << 3) // NW
+ (!IsWateredTile(TILE_ADDXY(tile, -1, 1), DIR_W) << 4) // E
+ (!IsWateredTile(TILE_ADDXY(tile, 1, 1), DIR_N) << 5) // S
+ (!IsWateredTile(TILE_ADDXY(tile, 1, -1), DIR_E) << 6) // W
+ (!IsWateredTile(TILE_ADDXY(tile, -1, -1), DIR_S) << 7); // N
return connectivity;
}
/* Random data for river or canal tiles, otherwise zero */
case 0x83: return IsTileType(this->tile, MP_WATER) ? GetWaterTileRandomBits(this->tile) : 0;
}
Debug(grf, 1, "Unhandled canal variable 0x{:02X}", variable);
*available = false;
return UINT_MAX;
}
GrfSpecFeature CanalResolverObject::GetFeature() const
{
return GSF_CANALS;
}
uint32 CanalResolverObject::GetDebugID() const
{
return this->feature;
}
/**
* Canal resolver constructor.
* @param feature Which canal feature we want.
* @param tile Tile index of canal.
* @param callback Callback ID.
* @param callback_param1 First parameter (var 10) of the callback.
* @param callback_param2 Second parameter (var 18) of the callback.
*/
CanalResolverObject::CanalResolverObject(CanalFeature feature, TileIndex tile,
CallbackID callback, uint32 callback_param1, uint32 callback_param2)
: ResolverObject(_water_feature[feature].grffile, callback, callback_param1, callback_param2), canal_scope(*this, tile), feature(feature)
{
this->root_spritegroup = _water_feature[feature].group;
}
/**
* Lookup the base sprite to use for a canal.
* @param feature Which canal feature we want.
* @param tile Tile index of canal, if appropriate.
* @return Base sprite returned by GRF, or \c 0 if none.
*/
SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)
{
CanalResolverObject object(feature, tile);
const SpriteGroup *group = object.Resolve();
if (group == nullptr) return 0;
return group->GetResult();
}
/**
* Run a specific callback for canals.
* @param callback Callback ID.
* @param param1 Callback parameter 1.
* @param param2 Callback parameter 2.
* @param feature For which feature to run the callback.
* @param tile Tile index of canal.
* @return Callback result or #CALLBACK_FAILED if the callback failed.
*/
static uint16 GetCanalCallback(CallbackID callback, uint32 param1, uint32 param2, CanalFeature feature, TileIndex tile)
{
CanalResolverObject object(feature, tile, callback, param1, param2);
return object.ResolveCallback();
}
/**
* Get the new sprite offset for a water tile.
* @param tile Tile index of the canal/water tile.
* @param feature For which feature to get the new sprite offset.
* @param cur_offset Current sprite offset.
* @return New sprite offset.
*/
uint GetCanalSpriteOffset(CanalFeature feature, TileIndex tile, uint cur_offset)
{
if (HasBit(_water_feature[feature].callback_mask, CBM_CANAL_SPRITE_OFFSET)) {
uint16 cb = GetCanalCallback(CBID_CANALS_SPRITE_OFFSET, cur_offset, 0, feature, tile);
if (cb != CALLBACK_FAILED) return cur_offset + cb;
}
return cur_offset;
}
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