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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 gamelog.h Functions to be called to log possibly unsafe game events */

#ifndef GAMELOG_H
#define GAMELOG_H

#include "newgrf_config.h"

enum GamelogActionType {
	GLAT_START,        ///< Game created
	GLAT_LOAD,         ///< Game loaded
	GLAT_GRF,          ///< GRF changed
	GLAT_CHEAT,        ///< Cheat was used
	GLAT_SETTING,      ///< Setting changed
	GLAT_GRFBUG,       ///< GRF bug was triggered
	GLAT_EMERGENCY,    ///< Emergency savegame
	GLAT_END,          ///< So we know how many GLATs are there
	GLAT_NONE  = 0xFF, ///< No logging active; in savegames, end of list
};

void GamelogStartAction(GamelogActionType at);
void GamelogStopAction();

void GamelogReset();

typedef void GamelogPrintProc(const char *s);
void GamelogPrint(GamelogPrintProc *proc); // needed for WIN32 / WINCE crash.log

void GamelogPrintDebug(int level);
void GamelogPrintConsole();

void GamelogEmergency();
bool GamelogTestEmergency();

void GamelogRevision();
void GamelogMode();
void GamelogOldver();
void GamelogSetting(const char *name, int32 oldval, int32 newval);

void GamelogGRFUpdate(const GRFConfig *oldg, const GRFConfig *newg);
void GamelogGRFAddList(const GRFConfig *newg);
void GamelogGRFRemove(uint32 grfid);
void GamelogGRFAdd(const GRFConfig *newg);
void GamelogGRFCompatible(const GRFIdentifier *newg);

void GamelogTestRevision();
void GamelogTestMode();
void GamelogTestGRF();

bool GamelogGRFBugReverse(uint32 grfid, uint16 internal_id);

void GamelogGetOriginalGRFMD5Checksum(uint32 grfid, byte *md5sum);

#endif /* GAMELOG_H */