89 lines
3.7 KiB
C++
89 lines
3.7 KiB
C++
#ifndef ARCH_HOOKS_H
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#define ARCH_HOOKS_H
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class ArchHooks
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{
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public:
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/* This is called as soon as SDL is set up, the loading window is shown
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* and we can safely log and throw. */
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virtual void DumpDebugInfo() { }
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virtual ~ArchHooks() { }
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/* This is called once each time through the game loop */
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virtual void Update(float delta) { }
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/* Re-exec the game. If this is implemented, it doesn't return. */
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virtual void RestartProgram() { }
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/* Call this to temporarily enter a high-priority or realtime scheduling (depending
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* on the implementation) mode. This is used to improve timestamp accuracy. Do as
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* little as possible in this mode; hanging in it might hang the system entirely. */
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virtual void EnterTimeCriticalSection() { }
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virtual void ExitTimeCriticalSection() { }
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virtual void SetTime( tm newtime ) { }
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/*
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* Return the amount of time since the program started. (This may actually be
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* since the initialization of HOOKS.
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*
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* Full microsecond accuracy may not be available.
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*
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* bAccurate is a hint: it specifies whether to prefer short-term precision
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* or long-term accuracy. If false, the implementation may give higher resolution
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* results, but not be as stable over long periods (eg. may drift depending on
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* clock speed shifts on laptops). If true, lower precision results (usually with
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* no less than a 1ms granularity) are returned, but the results should be stable
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* over long periods of time.
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*
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* Note that bAccurate may change the result significantly; it may use a different
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* timer, and may have a different concept of when the program "started".
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*
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* This is a static function, implemented in whichever ArchHooks source is used,
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* so it can be used at any time (such as in global constructors), before HOOKS
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* is initialized.
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*
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* RageTimer layers on top of this, and attempts to correct wrapping, as the
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* underlying timers may be 32-bit, but implementations should try to avoid
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* wrapping if possible.
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*/
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static int64_t GetMicrosecondsSinceStart( bool bAccurate );
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private:
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/* This are helpers for GetMicrosecondsSinceStart on systems with a timer
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* that may loop or move backwards. */
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static uint64_t FixupTimeIfLooped( uint64_t usecs );
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static uint64_t FixupTimeIfBackwards( uint64_t usecs );
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};
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ArchHooks *MakeArchHooks();
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#endif
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extern ArchHooks *HOOKS; // global and accessable from anywhere in our program
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/*
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* (c) 2003-2004 Glenn Maynard, Chris Danford
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, and/or sell copies of the Software, and to permit persons to
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* whom the Software is furnished to do so, provided that the above
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* copyright notice(s) and this permission notice appear in all copies of
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* the Software and that both the above copyright notice(s) and this
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* permission notice appear in supporting documentation.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
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* THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
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* INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
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* OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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