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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 newgrf_industries.h Functions for NewGRF industries. */

#ifndef NEWGRF_INDUSTRIES_H
#define NEWGRF_INDUSTRIES_H

#include "industry_type.h"
#include "newgrf_spritegroup.h"

/** When should the industry(tile) be triggered for random bits? */
enum IndustryTrigger {
	/** Triggered each tile loop */
	INDUSTRY_TRIGGER_TILELOOP_PROCESS = 1,
	/** Triggered (whole industry) each 256 ticks */
	INDUSTRY_TRIGGER_256_TICKS        = 2,
	/** Triggered on cargo delivery */
	INDUSTRY_TRIGGER_CARGO_DELIVERY   = 4,
};

/** From where is callback CBID_INDUSTRY_AVAILABLE been called */
enum IndustryAvailabilityCallType {
	IACT_MAPGENERATION,   ///< during random map generation
	IACT_RANDOMCREATION,  ///< during creation of random ingame industry
	IACT_USERCREATION,    ///< from the Fund/build window
};

/* in newgrf_industry.cpp */
uint32 IndustryGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available);
uint16 GetIndustryCallback(CallbackID callback, uint32 param1, uint32 param2, Industry *industry, IndustryType type, TileIndex tile);
uint32 GetIndustryIDAtOffset(TileIndex new_tile, const Industry *i);
void IndustryProductionCallback(Industry *ind, int reason);
bool CheckIfCallBackAllowsCreation(TileIndex tile, IndustryType type, uint itspec_index, uint32 seed);
bool CheckIfCallBackAllowsAvailability(IndustryType type, IndustryAvailabilityCallType creation_type);

IndustryType MapNewGRFIndustryType(IndustryType grf_type, uint32 grf_id);

/* in newgrf_industrytiles.cpp*/
uint32 GetNearbyIndustryTileInformation(byte parameter, TileIndex tile, IndustryID index);

#endif /* NEWGRF_INDUSTRIES_H */