animated_tile.cpp

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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/>.
 */
 
#include "stdafx.h"
#include "core/container_func.hpp"
#include "tile_cmd.h"
#include "viewport_func.h"
#include "framerate_type.h"
 
#include "safeguards.h"
 
std::vector<TileIndex> _animated_tiles;
 
void DeleteAnimatedTile(TileIndex tile)
{
  auto to_remove = std::find(_animated_tiles.begin(), _animated_tiles.end(), tile);
  if (to_remove != _animated_tiles.end()) {
    /* The order of the remaining elements must stay the same, otherwise the animation loop may miss a tile. */
    _animated_tiles.erase(to_remove);
    MarkTileDirtyByTile(tile);
  }
}
 
void AddAnimatedTile(TileIndex tile)
{
  MarkTileDirtyByTile(tile);
  include(_animated_tiles, tile);
}
 
void AnimateAnimatedTiles()
{
  PerformanceAccumulator framerate(PFE_GL_LANDSCAPE);
 
  const TileIndex *ti = _animated_tiles.data();
  while (ti < _animated_tiles.data() + _animated_tiles.size()) {
    const TileIndex curr = *ti;
    AnimateTile(curr);
    /* During the AnimateTile call, DeleteAnimatedTile could have been called,
     * deleting an element we've already processed and pushing the rest one
     * slot to the left. We can detect this by checking whether the index
     * in the current slot has changed - if it has, an element has been deleted,
     * and we should process the current slot again instead of going forward.
     * NOTE: this will still break if more than one animated tile is being
     *       deleted during the same AnimateTile call, but no code seems to
     *       be doing this anyway.
     */
    if (*ti == curr) ++ti;
  }
}
 
void InitializeAnimatedTiles()
{
  _animated_tiles.clear();
}