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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 geometry_type.hpp All geometry types in OpenTTD. */

#ifndef GEOMETRY_TYPE_HPP
#define GEOMETRY_TYPE_HPP

#if defined(__AMIGA__)
	/* AmigaOS already has a Point declared */
	#define Point OTTD_Point
#endif /* __AMIGA__ */

#if defined(__APPLE__)
	/* Mac OS X already has both Rect and Point declared */
	#define Rect OTTD_Rect
	#define Point OTTD_Point
#endif /* __APPLE__ */


/** Coordinates of a point in 2D */
struct Point {
	int x;
	int y;
};

/** Dimensions (a width and height) of a rectangle in 2D */
struct Dimension {
	uint width;
	uint height;
};

/** Specification of a rectangle with absolute coordinates of all edges */
struct Rect {
	int left;
	int top;
	int right;
	int bottom;
};

/**
 * Specification of a rectangle with an absolute top-left coordinate and a
 * (relative) width/height
 */
struct PointDimension {
	int x;
	int y;
	int width;
	int height;
};

/** A pair of two integers */
struct Pair {
	int a;
	int b;
};

#endif /* GEOMETRY_TYPE_HPP */