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BizHawk
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Cleanup and experimental (disabled for now) low CPU mode.

This commit is contained in:
jdpurcell 2015-01-02 21:50:46 +00:00
parent 153e823f78
commit 7abad21467
1 changed files with 46 additions and 47 deletions
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93
BizHawk.Client.EmuHawk/Throttle.cs
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@ -1,4 +1,5 @@
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
@ -145,36 +146,19 @@ namespace BizHawk.Client.EmuHawk
static ulong GetCurTime()
{
#if WINDOWS
if (tmethod == 1)
{
ulong tmp;
QueryPerformanceCounter(out tmp);
return tmp;
}
return (ulong)Stopwatch.GetTimestamp();
else
{
#endif
return (ulong)Environment.TickCount;
#if WINDOWS
}
#endif
}
#if WINDOWS
[DllImport("kernel32.dll", SetLastError = true)]
static extern bool QueryPerformanceCounter(out ulong lpPerformanceCount);
[DllImport("kernel32.dll", SetLastError = true)]
static extern bool QueryPerformanceFrequency(out ulong frequency);
[DllImport("winmm.dll", EntryPoint = "timeBeginPeriod")]
static extern uint timeBeginPeriod(uint uMilliseconds);
static readonly int tmethod;
#endif
static readonly int tmethod;
static readonly ulong afsfreq;
static readonly ulong tfreq;
@ -182,16 +166,23 @@ namespace BizHawk.Client.EmuHawk
{
#if WINDOWS
timeBeginPeriod(1);
tmethod = 0;
if (QueryPerformanceFrequency(out afsfreq))
tmethod = 1;
else
afsfreq = 1000;
Console.WriteLine("throttle method: {0}; resolution: {1}", tmethod, afsfreq);
#else
afsfreq = 1000;
#endif
tfreq = afsfreq << 16;
#if WINDOWS // This seems safe even on other platforms, but needs testing to confirm
if (Stopwatch.IsHighResolution)
{
afsfreq = (ulong)Stopwatch.Frequency;
tmethod = 1;
}
else
{
#endif
afsfreq = 1000;
tmethod = 0;
#if WINDOWS
}
#endif
Console.WriteLine("throttle method: {0}; resolution: {1}", tmethod, afsfreq);
tfreq = afsfreq * 65536;
}
public void SetCoreFps(double desired_fps)
@ -343,35 +334,43 @@ namespace BizHawk.Client.EmuHawk
{
AutoFrameSkip_BeforeThrottle();
waiter:
if (signal_unthrottle)
return;
bool lowCPUMode = false; // Hard-code to true for testing
ulong timePerFrame = tfreq / desiredfps;
ulong ttime = GetCurTime();
if ((ttime - ltime) < (tfreq / desiredfps))
while (true)
{
ulong sleepy = (tfreq / desiredfps) - (ttime - ltime);
sleepy *= 1000;
if (tfreq >= 65536)
sleepy /= afsfreq;
else
sleepy = 0;
if (sleepy >= 10 || paused)
if (signal_unthrottle)
return;
ulong ttime = GetCurTime();
ulong elapsedTime = ttime - ltime;
if (elapsedTime >= timePerFrame)
{
if (elapsedTime >= timePerFrame * 4)
ltime = ttime;
else
ltime += timePerFrame;
return;
}
int sleepy = (int)((timePerFrame - elapsedTime) * 1000 / afsfreq);
if (lowCPUMode && (sleepy >= 2 || paused))
{
// Subtract 1 to reduce the chance of oversleeping
Thread.Sleep(Math.Max(sleepy - 1, 1));
}
else if (sleepy >= 10 || paused)
{
Thread.Sleep((int)(sleepy / 2));
// reduce it further beacuse Sleep usually sleeps for more than the amount we tell it to
Thread.Sleep(sleepy / 2);
}
else if (sleepy > 0) // spin for <1 millisecond waits
{
Thread.Yield(); // limit to other threads on the same CPU core for other short waits
}
goto waiter;
}
if ((ttime - ltime) >= (tfreq * 4 / desiredfps))
ltime = ttime;
else
ltime += tfreq / desiredfps;
}
}
}