mirror of
https://gitea.wildfiregames.com/0ad/0ad
synced 2026-06-17 22:03:56 -07:00
43137fef3f
Differential Revision: https://code.wildfiregames.com/D716
Refs 09e974e1cb
Reviewed By: bb
Change in agreement with leper.
This was SVN commit r19899.
106 lines
2.7 KiB
C++
106 lines
2.7 KiB
C++
/* Copyright (C) 2010 Wildfire Games.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a 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, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Timer implementation using timeGetTime
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*/
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// note: WinMM is delay-loaded to avoid dragging it in when this timer
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// implementation isn't used. (this is relevant because its startup is
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// fairly slow)
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#include "precompiled.h"
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#include "lib/sysdep/os/win/whrt/tgt.h"
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#include "lib/sysdep/os/win/whrt/counter.h"
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#include "lib/sysdep/os/win/win.h"
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#include <mmsystem.h>
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#if MSC_VERSION
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#pragma comment(lib, "winmm.lib")
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#endif
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// "Guidelines For Providing Multimedia Timer Support" claims that
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// speeding the timer up to 2 ms has little impact, while 1 ms
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// causes significant slowdown.
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static const UINT PERIOD_MS = 2;
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class CounterTGT : public ICounter
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{
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public:
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virtual const char* Name() const
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{
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return "TGT";
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}
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Status Activate()
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{
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// note: timeGetTime is always available and cannot fail.
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MMRESULT ret = timeBeginPeriod(PERIOD_MS);
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ENSURE(ret == TIMERR_NOERROR);
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return INFO::OK;
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}
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void Shutdown()
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{
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timeEndPeriod(PERIOD_MS);
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}
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bool IsSafe() const
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{
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// the only point of criticism is the possibility of falling behind
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// due to lost interrupts. this can happen to any interrupt-based timer
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// and some systems may lack a counter-based timer, so consider TGT
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// 'safe'. note that it is still only chosen when all other timers fail.
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return true;
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}
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u64 Counter() const
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{
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return timeGetTime();
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}
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size_t CounterBits() const
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{
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return 32;
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}
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double NominalFrequency() const
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{
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return 1000.0;
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}
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double Resolution() const
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{
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return PERIOD_MS*1e-3;
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}
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};
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ICounter* CreateCounterTGT(void* address, size_t size)
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{
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ENSURE(sizeof(CounterTGT) <= size);
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return new(address) CounterTGT();
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}
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