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149 lines
4.3 KiB
C++
149 lines
4.3 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_canal.cpp Implementation of NewGRF canals. */
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#include "stdafx.h"
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#include "debug.h"
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#include "newgrf_spritegroup.h"
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#include "newgrf_canal.h"
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#include "water_map.h"
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/** Table of canal 'feature' sprite groups */
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WaterFeature _water_feature[CF_END];
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/* Random bits and triggers are not supported for canals, so the following
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* three functions are stubs. */
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static uint32 CanalGetRandomBits(const ResolverObject *object)
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{
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/* Return random bits only for water tiles, not station tiles */
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return IsTileType(object->u.canal.tile, MP_WATER) ? GetWaterTileRandomBits(object->u.canal.tile) : 0;
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}
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static uint32 CanalGetTriggers(const ResolverObject *object)
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{
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return 0;
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}
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static void CanalSetTriggers(const ResolverObject *object, int triggers)
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{
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return;
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}
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static uint32 CanalGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
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{
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TileIndex tile = object->u.canal.tile;
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switch (variable) {
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/* Height of tile */
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case 0x80: return GetTileZ(tile) / TILE_HEIGHT;
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/* Terrain type */
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case 0x81: return GetTerrainType(tile);
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/* Random data for river or canal tiles, otherwise zero */
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case 0x83: return GetWaterTileRandomBits(tile);
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}
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DEBUG(grf, 1, "Unhandled canal property 0x%02X", 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 *CanalResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
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{
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if (group->num_loaded == 0) return NULL;
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return group->loaded[0];
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}
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static void NewCanalResolver(ResolverObject *res, TileIndex tile, const GRFFile *grffile)
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{
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res->GetRandomBits = &CanalGetRandomBits;
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res->GetTriggers = &CanalGetTriggers;
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res->SetTriggers = &CanalSetTriggers;
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res->GetVariable = &CanalGetVariable;
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res->ResolveReal = &CanalResolveReal;
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res->u.canal.tile = tile;
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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->last_value = 0;
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res->trigger = 0;
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res->reseed = 0;
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res->count = 0;
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res->grffile = grffile;
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}
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SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)
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{
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ResolverObject object;
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const SpriteGroup *group;
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NewCanalResolver(&object, tile, _water_feature[feature].grffile);
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group = SpriteGroup::Resolve(_water_feature[feature].group, &object);
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if (group == NULL) return 0;
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return group->GetResult();
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}
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/**
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* Run a specific callback for canals.
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* @param callback Callback ID.
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* @param param1 Callback parameter 1.
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* @param param2 Callback parameter 2.
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* @param feature For which feature to run the callback.
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* @param tile Tile index of canal.
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* @return Callback result or CALLBACK_FAILED if the callback failed.
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*/
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uint16 GetCanalCallback(CallbackID callback, uint32 param1, uint32 param2, CanalFeature feature, TileIndex tile)
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{
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ResolverObject object;
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const SpriteGroup *group;
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NewCanalResolver(&object, tile, _water_feature[feature].grffile);
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object.callback = callback;
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object.callback_param1 = param1;
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object.callback_param2 = param2;
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group = SpriteGroup::Resolve(_water_feature[feature].group, &object);
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if (group == NULL) return CALLBACK_FAILED;
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return group->GetCallbackResult();
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}
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/**
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* Get the new sprite offset for a water tile.
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* @param tile Tile index of the canal/water tile.
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* @param feature For which feature to get the new sprite offset.
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* @param cur_offset Current sprite offset.
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* @return New sprite offset.
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*/
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uint GetCanalSpriteOffset(CanalFeature feature, TileIndex tile, uint cur_offset)
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{
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if (HasBit(_water_feature[feature].callback_mask, CBM_CANAL_SPRITE_OFFSET)) {
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uint16 cb = GetCanalCallback(CBID_CANALS_SPRITE_OFFSET, cur_offset, 0, feature, tile);
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if (cb != CALLBACK_FAILED) return cur_offset + cb;
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}
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return cur_offset;
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}
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