src/animated_tile.cpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file animated_tile.cpp Everything related to animated tiles. */
   9
  10 #include "stdafx.h"
  11 #include "core/container_func.hpp"
  12 #include "tile_cmd.h"
  13 #include "viewport_func.h"
  14 #include "framerate_type.h"
  15
  16 #include "safeguards.h"
  17
  18 /** The table/list with animated tiles. */
  19 std::vector<TileIndex> _animated_tiles;
  20
  21 /**
  22  * Removes the given tile from the animated tile table.
  23  * @param tile the tile to remove
  24  */
  25 void DeleteAnimatedTile(TileIndex tile)
  26 {
  27         auto to_remove = std::find(_animated_tiles.begin(), _animated_tiles.end(), tile);
  28         if (to_remove != _animated_tiles.end()) {
  29                 /* The order of the remaining elements must stay the same, otherwise the animation loop may miss a tile. */
  30                 _animated_tiles.erase(to_remove);
  31                 MarkTileDirtyByTile(tile);
  32         }
  33 }
  34
  35 /**
  36  * Add the given tile to the animated tile table (if it does not exist
  37  * on that table yet). Also increases the size of the table if necessary.
  38  * @param tile the tile to make animated
  39  */
  40 void AddAnimatedTile(TileIndex tile)
  41 {
  42         MarkTileDirtyByTile(tile);
  43         include(_animated_tiles, tile);
  44 }
  45
  46 /**
  47  * Animate all tiles in the animated tile list, i.e.\ call AnimateTile on them.
  48  */
  49 void AnimateAnimatedTiles()
  50 {
  51         PerformanceAccumulator framerate(PFE_GL_LANDSCAPE);
  52
  53         const TileIndex *ti = _animated_tiles.data();
  54         while (ti < _animated_tiles.data() + _animated_tiles.size()) {
  55                 const TileIndex curr = *ti;
  56                 AnimateTile(curr);
  57                 /* During the AnimateTile call, DeleteAnimatedTile could have been called,
  58                  * deleting an element we've already processed and pushing the rest one
  59                  * slot to the left. We can detect this by checking whether the index
  60                  * in the current slot has changed - if it has, an element has been deleted,
  61                  * and we should process the current slot again instead of going forward.
  62                  * NOTE: this will still break if more than one animated tile is being
  63                  *       deleted during the same AnimateTile call, but no code seems to
  64                  *       be doing this anyway.
  65                  */
  66                 if (*ti == curr) ++ti;
  67         }
  68 }
  69
  70 /**
  71  * Initialize all animated tile variables to some known begin point
  72  */
  73 void InitializeAnimatedTiles()
  74 {
  75         _animated_tiles.clear();
  76 }