mirror of
https://github.com/alliedmodders/hl2sdk.git
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94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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//=============================================================================
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#include "tier1/reliabletimer.h"
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int64 CReliableTimer::sm_nPerformanceFrequency = 0;
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bool CReliableTimer::sm_bUseQPC = false;
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#ifdef _WIN32
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#include "winlite.h"
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#endif
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//-----------------------------------------------------------------------------
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// Purpose: Constructor
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//-----------------------------------------------------------------------------
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CReliableTimer::CReliableTimer()
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{
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m_nPerformanceCounterStart = 0;
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m_nPerformanceCounterEnd = 0;
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m_nPerformanceCounterLimit = 0;
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#ifdef _WIN32
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// calculate performance frequency the first time we use a timer
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if ( 0 == sm_nPerformanceFrequency )
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{
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// Are we on a bad CPU?
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sm_bUseQPC = false; // todo
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const CPUInformation &cpu = *GetCPUInformation();
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sm_bUseQPC = ( ( 0 == Q_stricmp( cpu.m_szProcessorID, "AuthenticAMD" ) )
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&& ( cpu.m_nPhysicalProcessors > 1 )
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&& !cpu.m_bSSE41 );
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if ( sm_bUseQPC )
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{
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LARGE_INTEGER li;
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QueryPerformanceFrequency( &li );
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sm_nPerformanceFrequency = li.QuadPart;
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}
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else
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{
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sm_nPerformanceFrequency = g_ClockSpeed;
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}
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}
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#elif defined(_PS3)
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// On PowerPC, the time base register increment frequency is implementation dependent, and doesn't have to be constant.
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// On PS3, measured it to be just shy of 80Mhz on the PPU and doesn't seem to change
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if ( sm_nPerformanceFrequency == 0 )
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sm_nPerformanceFrequency = sys_time_get_timebase_frequency();
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#else
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// calculate performance frequency the first time we use a timer
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if ( 0 == sm_nPerformanceFrequency )
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{
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sm_nPerformanceFrequency = g_ClockSpeed;
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}
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#endif
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}
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//-----------------------------------------------------------------------------
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// Purpose: Returns current QueryPerformanceCounter value
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//-----------------------------------------------------------------------------
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int64 CReliableTimer::GetPerformanceCountNow()
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{
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//VPROF_BUDGET( "CReliableTimer::GetPerformanceCountNow", VPROF_BUDGETGROUP_OTHER_UNACCOUNTED );
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#ifdef _WIN32
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if ( sm_bUseQPC )
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{
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LARGE_INTEGER li = {0};
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QueryPerformanceCounter( &li );
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return li.QuadPart;
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}
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else
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{
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CCycleCount CycleCount;
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CycleCount.Sample();
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return CycleCount.GetLongCycles();
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}
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#elif defined( _PS3 )
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// use handy macro to grab tb
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uint64 ulNow;
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SYS_TIMEBASE_GET( ulNow );
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return ulNow;
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#else
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uint64 un64;
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__asm__ __volatile__ (
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"rdtsc\n\t"
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: "=A" (un64) );
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return (int64)un64;
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#endif
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}
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