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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 industry_type.h Types related to the industry. */

#ifndef INDUSTRY_TYPE_H
#define INDUSTRY_TYPE_H

typedef uint16 IndustryID;
typedef uint16 IndustryGfx;
typedef uint8 IndustryType;
struct Industry;

struct IndustrySpec;
struct IndustryTileSpec;

static const IndustryID INVALID_INDUSTRY = 0xFFFF;

enum {
	NEW_INDUSTRYOFFSET     = 37,                         ///< original number of industries
	NUM_INDUSTRYTYPES      = 64,                         ///< total number of industries, new and old
	INDUSTRYTILE_NOANIM    = 0xFF,                       ///< flag to mark industry tiles as having no animation
	NEW_INDUSTRYTILEOFFSET = 175,                        ///< original number of tiles
	INVALID_INDUSTRYTYPE   = NUM_INDUSTRYTYPES,          ///< one above amount is considered invalid
	NUM_INDUSTRYTILES      = 512,                        ///< total number of industry tiles, new and old
	INVALID_INDUSTRYTILE   = NUM_INDUSTRYTILES,          ///< one above amount is considered invalid
	INDUSTRY_COMPLETED     = 3,                          ///< final stage of industry construction.
};

#endif /* INDUSTRY_TYPE_H */