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rubidium

(svn r17776) -Codechange: [SDL] make "update the video card"-process asynchronious. Profiling with gprof etc. hasn't shown us that DrawSurfaceToScreen takes a significant amount of CPU; only using TIC/TOC it became apparant that it was a heavy CPU-cycle user or that it was waiting for something.
The benefit of making this function asynchronious ranges from 2%-25% (real time) during fast forward on dual core/hyperthreading-enabled CPUs; 8bpp improvements are, in my test cases, significantly smaller than 32bpp improvements.
On single core non-hyperthreading-enabled CPUs the extra locking/scheduling costs up to 1% extra realtime in fast forward. You can use -v sdl:no_threads to disable threading and undo this loss.
During normal non-fast-forwarded games the benefit/costs are negligable except when the gameloop takes more than about 90% of the time of a tick.
Note that allegro's performance does not improve with this system, likely due to their way of getting data to the video card. It is not implemented for the OS X/Windows video backends, unless (ofcourse) SDL is used there.
Funny is that the performance of the 32bpp(-anim) blitter is, at least in some test cases, significantly faster (more than 10%) than the 8bpp(-optimized) blitter when looking at real time in fast forward on a dual core CPU; it was slower.
The idea comes from a paper/report by Idar Borlaug and Knut Imar Hagen.

/* $Id$ */

/*
 * 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/>.
 */

/** @file station_func.h Functions related to stations. */

#ifndef STATION_FUNC_H
#define STATION_FUNC_H

#include "station_type.h"
#include "sprite.h"
#include "rail_type.h"
#include "road_type.h"
#include "tile_type.h"
#include "cargo_type.h"
#include "vehicle_type.h"
#include "core/smallvec_type.hpp"

void ModifyStationRatingAround(TileIndex tile, Owner owner, int amount, uint radius);

typedef SmallVector<Station*, 1> StationList;
void FindStationsAroundTiles(TileIndex tile, int w_prod, int h_prod, StationList *stations);

void ShowStationViewWindow(StationID station);
void UpdateAllStationVirtCoords();

CargoArray GetProductionAroundTiles(TileIndex tile, int w, int h, int rad);
CargoArray GetAcceptanceAroundTiles(TileIndex tile, int w, int h, int rad, uint32 *always_accepted = NULL);

void UpdateStationAcceptance(Station *st, bool show_msg);

const DrawTileSprites *GetStationTileLayout(StationType st, byte gfx);
void StationPickerDrawSprite(int x, int y, StationType st, RailType railtype, RoadType roadtype, int image);

bool HasStationInUse(StationID station, CompanyID company);

RoadStop *GetRoadStopByTile(TileIndex tile, RoadStopType type);
uint GetNumRoadStops(const Station *st, RoadStopType type);

void ClearSlot(struct RoadVehicle *v);

void DeleteOilRig(TileIndex t);

/* Check if a rail station tile is traversable. */
bool IsStationTileBlocked(TileIndex tile);

/* Check if a rail station tile is electrifiable. */
bool IsStationTileElectrifiable(TileIndex tile);

void UpdateAirportsNoise();

#endif /* STATION_FUNC_H */