tron@2186: /* $Id$ */
tron@2186: 
rubidium@10268: /** @file animated_tile.cpp Everything related to animated tiles. */
belugas@6918: 
truelight@0: #include "stdafx.h"
Darkvater@1891: #include "openttd.h"
truelight@0: #include "saveload.h"
rubidium@10268: #include "landscape.h"
rubidium@8626: #include "core/alloc_func.hpp"
rubidium@8627: #include "functions.h"
truelight@0: 
rubidium@8190: /** The table/list with animated tiles. */
rubidium@8190: TileIndex *_animated_tile_list = NULL;
rubidium@8190: /** The number of animated tiles in the current state. */
rubidium@8190: uint _animated_tile_count = 0;
rubidium@8190: /** The number of slots for animated tiles allocated currently. */
rubidium@8190: static uint _animated_tile_allocated = 0;
rubidium@8190: 
rubidium@8190: /**
rubidium@8190:  * Removes the given tile from the animated tile table.
rubidium@8190:  * @param tile the tile to remove
rubidium@8190:  */
tron@1977: void DeleteAnimatedTile(TileIndex tile)
truelight@0: {
rubidium@8190: 	for (TileIndex *ti = _animated_tile_list; ti < _animated_tile_list + _animated_tile_count; ti++) {
tron@1977: 		if (tile == *ti) {
rubidium@8245: 			/* Remove the hole
rubidium@8245: 			 * The order of the remaining elements must stay the same, otherwise the animation loop
rubidium@8245: 			 * may miss a tile; that's why we must use memmove instead of just moving the last element.
rubidium@8245: 			 */
rubidium@8245: 			memmove(ti, ti + 1, (_animated_tile_list + _animated_tile_count - (ti + 1)) * sizeof(*ti));
rubidium@8190: 			_animated_tile_count--;
truelight@0: 			MarkTileDirtyByTile(tile);
truelight@0: 			return;
truelight@193: 		}
truelight@0: 	}
truelight@0: }
truelight@0: 
rubidium@8190: /**
rubidium@8190:  * Add the given tile to the animated tile table (if it does not exist
rubidium@8190:  * on that table yet). Also increases the size of the table if necessary.
rubidium@8190:  * @param tile the tile to make animated
rubidium@8190:  */
rubidium@8190: void AddAnimatedTile(TileIndex tile)
truelight@0: {
rubidium@8190: 	MarkTileDirtyByTile(tile);
truelight@0: 
rubidium@8190: 	for (const TileIndex *ti = _animated_tile_list; ti < _animated_tile_list + _animated_tile_count; ti++) {
rubidium@8190: 		if (tile == *ti) return;
truelight@193: 	}
truelight@0: 
rubidium@8190: 	/* Table not large enough, so make it larger */
rubidium@8190: 	if (_animated_tile_count == _animated_tile_allocated) {
rubidium@8190: 		_animated_tile_allocated *= 2;
rubidium@8190: 		_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, _animated_tile_allocated);
rubidium@8190: 	}
rubidium@8190: 
rubidium@8190: 	_animated_tile_list[_animated_tile_count] = tile;
rubidium@8190: 	_animated_tile_count++;
truelight@0: }
truelight@0: 
rubidium@8190: /**
rubidium@8190:  * Animate all tiles in the animated tile list, i.e.\ call AnimateTile on them.
rubidium@8190:  */
rubidium@6573: void AnimateAnimatedTiles()
truelight@0: {
rubidium@8245: 	const TileIndex *ti = _animated_tile_list;
rubidium@8245: 	while (ti < _animated_tile_list + _animated_tile_count) {
rubidium@8245: 		const TileIndex curr = *ti;
rubidium@8245: 		AnimateTile(curr);
rubidium@8245: 		/* During the AnimateTile call, DeleteAnimatedTile could have been called,
rubidium@8245: 		 * deleting an element we've already processed and pushing the rest one
rubidium@8245: 		 * slot to the left. We can detect this by checking whether the index
rubidium@8245: 		 * in the current slot has changed - if it has, an element has been deleted,
rubidium@8245: 		 * and we should process the current slot again instead of going forward.
rubidium@8245: 		 * NOTE: this will still break if more than one animated tile is being
rubidium@8245: 		 *       deleted during the same AnimateTile call, but no code seems to
rubidium@8245: 		 *       be doing this anyway.
rubidium@8245: 		 */
rubidium@8245: 		if (*ti == curr) ++ti;
truelight@0: 	}
truelight@0: }
truelight@0: 
rubidium@8190: /**
rubidium@8190:  * Initialize all animated tile variables to some known begin point
rubidium@8190:  */
rubidium@6573: void InitializeAnimatedTiles()
truelight@0: {
rubidium@8190: 	_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, 256);
rubidium@8190: 	_animated_tile_count = 0;
rubidium@8190: 	_animated_tile_allocated = 256;
truelight@0: }
truelight@0: 
rubidium@8190: /**
rubidium@8190:  * Save the ANIT chunk.
rubidium@8190:  */
rubidium@8190: static void Save_ANIT()
truelight@0: {
rubidium@8190: 	SlSetLength(_animated_tile_count * sizeof(*_animated_tile_list));
rubidium@8190: 	SlArray(_animated_tile_list, _animated_tile_count, SLE_UINT32);
truelight@0: }
truelight@0: 
rubidium@8190: /**
rubidium@8190:  * Load the ANIT chunk; the chunk containing the animated tiles.
rubidium@8190:  */
rubidium@8190: static void Load_ANIT()
rubidium@8190: {
rubidium@8190: 	/* Before version 80 we did NOT have a variable length animated tile table */
rubidium@8190: 	if (CheckSavegameVersion(80)) {
rubidium@8190: 		/* In pre version 6, we has 16bit per tile, now we have 32bit per tile, convert it ;) */
rubidium@8190: 		SlArray(_animated_tile_list, 256, CheckSavegameVersion(6) ? (SLE_FILE_U16 | SLE_VAR_U32) : SLE_UINT32);
truelight@0: 
rubidium@8190: 		for (_animated_tile_count = 0; _animated_tile_count < 256; _animated_tile_count++) {
rubidium@8190: 			if (_animated_tile_list[_animated_tile_count] == 0) break;
rubidium@8190: 		}
rubidium@8190: 		return;
rubidium@8190: 	}
rubidium@8190: 
rubidium@10751: 	_animated_tile_count = (uint)SlGetFieldLength() / sizeof(*_animated_tile_list);
rubidium@8190: 
rubidium@8190: 	/* Determine a nice rounded size for the amount of allocated tiles */
rubidium@8190: 	_animated_tile_allocated = 256;
rubidium@8190: 	while (_animated_tile_allocated < _animated_tile_count) _animated_tile_allocated *= 2;
rubidium@8190: 
rubidium@8190: 	_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, _animated_tile_allocated);
rubidium@8190: 	SlArray(_animated_tile_list, _animated_tile_count, SLE_UINT32);
rubidium@8190: }
rubidium@8190: 
rubidium@8190: /**
rubidium@8190:  * "Definition" imported by the saveload code to be able to load and save
rubidium@8190:  * the animated tile table.
rubidium@8190:  */
rubidium@5838: extern const ChunkHandler _animated_tile_chunk_handlers[] = {
rubidium@8190: 	{ 'ANIT', Save_ANIT, Load_ANIT, CH_RIFF | CH_LAST},
truelight@0: };