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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 texteff.hpp Functions related to text effects. */

#ifndef TEXTEFF_HPP
#define TEXTEFF_HPP

#include "gfx_type.h"

/**
 * Text effect modes.
 */
enum TextEffectMode {
	TE_RISING, ///< Make the text effect slowly go upwards
	TE_STATIC, ///< Keep the text effect static

	INVALID_TE_ID = 0xFFFF,
};

typedef uint16 TextEffectID;

void MoveAllTextEffects();
TextEffectID AddTextEffect(StringID msg, int x, int y, uint16 duration, TextEffectMode mode);
void InitTextEffects();
void DrawTextEffects(DrawPixelInfo *dpi);
void UpdateTextEffect(TextEffectID effect_id, StringID msg);
void RemoveTextEffect(TextEffectID effect_id);

/* misc_gui.cpp */
TextEffectID ShowFillingPercent(int x, int y, int z, uint8 percent, StringID colour);
void UpdateFillingPercent(TextEffectID te_id, uint8 percent, StringID colour);
void HideFillingPercent(TextEffectID *te_id);

#endif /* TEXTEFF_HPP */