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f4f4044859
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.
87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file thread.h Base of all threads. */
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#ifndef THREAD_H
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#define THREAD_H
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typedef void (*OTTDThreadFunc)(void *);
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class OTTDThreadExitSignal { };
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/**
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* A Thread Object which works on all our supported OSes.
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*/
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class ThreadObject {
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public:
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/**
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* Virtual destructor to allow 'delete' operator to work properly.
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*/
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virtual ~ThreadObject() {};
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/**
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* Exit this thread.
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*/
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virtual bool Exit() = 0;
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/**
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* Join this thread.
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*/
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virtual void Join() = 0;
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/**
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* Create a thread; proc will be called as first function inside the thread,
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* with optinal params.
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* @param proc The procedure to call inside the thread.
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* @param param The params to give with 'proc'.
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* @param thread Place to store a pointer to the thread in. May be NULL.
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* @return True if the thread was started correctly.
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*/
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static bool New(OTTDThreadFunc proc, void *param, ThreadObject **thread = NULL);
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};
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/**
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* Cross-platform Mutex
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*/
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class ThreadMutex {
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public:
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static ThreadMutex *New();
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/**
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* Virtual Destructor to avoid compiler warnings.
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*/
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virtual ~ThreadMutex() {};
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/**
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* Begin the critical section
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*/
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virtual void BeginCritical() = 0;
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/**
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* End of the critical section
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*/
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virtual void EndCritical() = 0;
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/**
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* Wait for a signal to be send.
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* @pre You must be in the critical section.
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* @note While waiting the critical section is left.
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* @post You will be in the critical section.
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*/
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virtual void WaitForSignal() = 0;
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/**
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* Send a signal and wake the 'thread' that was waiting for it.
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*/
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virtual void SendSignal() = 0;
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};
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#endif /* THREAD_H */
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