glx@10294: /* $Id$ */
glx@10294: 
glx@10294: /** @file animated_tile.cpp Everything related to animated tiles. */
glx@10294: 
glx@10294: #include "stdafx.h"
glx@10294: #include "openttd.h"
glx@10294: #include "saveload.h"
glx@10294: #include "landscape.h"
glx@10294: #include "core/alloc_func.hpp"
glx@10294: #include "functions.h"
glx@10294: 
glx@10294: /** The table/list with animated tiles. */
glx@10294: TileIndex *_animated_tile_list = NULL;
glx@10294: /** The number of animated tiles in the current state. */
glx@10294: uint _animated_tile_count = 0;
glx@10294: /** The number of slots for animated tiles allocated currently. */
glx@10294: static uint _animated_tile_allocated = 0;
glx@10294: 
glx@10294: /**
glx@10294:  * Removes the given tile from the animated tile table.
glx@10294:  * @param tile the tile to remove
glx@10294:  */
glx@10294: void DeleteAnimatedTile(TileIndex tile)
glx@10294: {
glx@10294: 	for (TileIndex *ti = _animated_tile_list; ti < _animated_tile_list + _animated_tile_count; ti++) {
glx@10294: 		if (tile == *ti) {
glx@10294: 			/* Remove the hole
glx@10294: 			 * The order of the remaining elements must stay the same, otherwise the animation loop
glx@10294: 			 * may miss a tile; that's why we must use memmove instead of just moving the last element.
glx@10294: 			 */
glx@10294: 			memmove(ti, ti + 1, (_animated_tile_list + _animated_tile_count - (ti + 1)) * sizeof(*ti));
glx@10294: 			_animated_tile_count--;
glx@10294: 			MarkTileDirtyByTile(tile);
glx@10294: 			return;
glx@10294: 		}
glx@10294: 	}
glx@10294: }
glx@10294: 
glx@10294: /**
glx@10294:  * Add the given tile to the animated tile table (if it does not exist
glx@10294:  * on that table yet). Also increases the size of the table if necessary.
glx@10294:  * @param tile the tile to make animated
glx@10294:  */
glx@10294: void AddAnimatedTile(TileIndex tile)
glx@10294: {
glx@10294: 	MarkTileDirtyByTile(tile);
glx@10294: 
glx@10294: 	for (const TileIndex *ti = _animated_tile_list; ti < _animated_tile_list + _animated_tile_count; ti++) {
glx@10294: 		if (tile == *ti) return;
glx@10294: 	}
glx@10294: 
glx@10294: 	/* Table not large enough, so make it larger */
glx@10294: 	if (_animated_tile_count == _animated_tile_allocated) {
glx@10294: 		_animated_tile_allocated *= 2;
glx@10294: 		_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, _animated_tile_allocated);
glx@10294: 	}
glx@10294: 
glx@10294: 	_animated_tile_list[_animated_tile_count] = tile;
glx@10294: 	_animated_tile_count++;
glx@10294: }
glx@10294: 
glx@10294: /**
glx@10294:  * Animate all tiles in the animated tile list, i.e.\ call AnimateTile on them.
glx@10294:  */
glx@10294: void AnimateAnimatedTiles()
glx@10294: {
glx@10294: 	const TileIndex *ti = _animated_tile_list;
glx@10294: 	while (ti < _animated_tile_list + _animated_tile_count) {
glx@10294: 		const TileIndex curr = *ti;
glx@10294: 		AnimateTile(curr);
glx@10294: 		/* During the AnimateTile call, DeleteAnimatedTile could have been called,
glx@10294: 		 * deleting an element we've already processed and pushing the rest one
glx@10294: 		 * slot to the left. We can detect this by checking whether the index
glx@10294: 		 * in the current slot has changed - if it has, an element has been deleted,
glx@10294: 		 * and we should process the current slot again instead of going forward.
glx@10294: 		 * NOTE: this will still break if more than one animated tile is being
glx@10294: 		 *       deleted during the same AnimateTile call, but no code seems to
glx@10294: 		 *       be doing this anyway.
glx@10294: 		 */
glx@10294: 		if (*ti == curr) ++ti;
glx@10294: 	}
glx@10294: }
glx@10294: 
glx@10294: /**
glx@10294:  * Initialize all animated tile variables to some known begin point
glx@10294:  */
glx@10294: void InitializeAnimatedTiles()
glx@10294: {
glx@10294: 	_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, 256);
glx@10294: 	_animated_tile_count = 0;
glx@10294: 	_animated_tile_allocated = 256;
glx@10294: }
glx@10294: 
glx@10294: /**
glx@10294:  * Save the ANIT chunk.
glx@10294:  */
glx@10294: static void Save_ANIT()
glx@10294: {
glx@10294: 	SlSetLength(_animated_tile_count * sizeof(*_animated_tile_list));
glx@10294: 	SlArray(_animated_tile_list, _animated_tile_count, SLE_UINT32);
glx@10294: }
glx@10294: 
glx@10294: /**
glx@10294:  * Load the ANIT chunk; the chunk containing the animated tiles.
glx@10294:  */
glx@10294: static void Load_ANIT()
glx@10294: {
glx@10294: 	/* Before version 80 we did NOT have a variable length animated tile table */
glx@10294: 	if (CheckSavegameVersion(80)) {
glx@10294: 		/* In pre version 6, we has 16bit per tile, now we have 32bit per tile, convert it ;) */
glx@10294: 		SlArray(_animated_tile_list, 256, CheckSavegameVersion(6) ? (SLE_FILE_U16 | SLE_VAR_U32) : SLE_UINT32);
glx@10294: 
glx@10294: 		for (_animated_tile_count = 0; _animated_tile_count < 256; _animated_tile_count++) {
glx@10294: 			if (_animated_tile_list[_animated_tile_count] == 0) break;
glx@10294: 		}
glx@10294: 		return;
glx@10294: 	}
glx@10294: 
glx@10776: 	_animated_tile_count = (uint)SlGetFieldLength() / sizeof(*_animated_tile_list);
glx@10294: 
glx@10294: 	/* Determine a nice rounded size for the amount of allocated tiles */
glx@10294: 	_animated_tile_allocated = 256;
glx@10294: 	while (_animated_tile_allocated < _animated_tile_count) _animated_tile_allocated *= 2;
glx@10294: 
glx@10294: 	_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, _animated_tile_allocated);
glx@10294: 	SlArray(_animated_tile_list, _animated_tile_count, SLE_UINT32);
glx@10294: }
glx@10294: 
glx@10294: /**
glx@10294:  * "Definition" imported by the saveload code to be able to load and save
glx@10294:  * the animated tile table.
glx@10294:  */
glx@10294: extern const ChunkHandler _animated_tile_chunk_handlers[] = {
glx@10294: 	{ 'ANIT', Save_ANIT, Load_ANIT, CH_RIFF | CH_LAST},
glx@10294: };