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Gambatte core experimental change to the definition of a frame. gambatte runs the number of cycles it feels like even when you tell it. So track the difference between the desired amount of actual run and adjust the next frame. This way, in thoery it should average out to the desired 35112 cycles per frame. Also track the cycle count and expose it for future api to use

This commit is contained in:
adelikat 2014-04-28 16:02:11 +00:00
parent c863d57113
commit 4269098e8a
1 changed files with 11 additions and 1 deletions
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12
BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/Gambatte.cs
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@ -221,14 +221,24 @@ namespace BizHawk.Emulation.Cores.Nintendo.Gameboy
endofframecallback(LibGambatte.gambatte_cpuread(GambatteState, 0xff40));
}
ulong _cycleCount = 0;
uint _nextRunAdjust = 0;
public ulong CycleCount { get { return _cycleCount; } }
public void FrameAdvance(bool render, bool rendersound)
{
FrameAdvancePrep();
uint nsamp = 35112; // according to gambatte docs, this is the nominal length of a frame in 2mhz clocks
uint nsamp = 35112 + _nextRunAdjust; // according to gambatte docs, this is the nominal length of a frame in 2mhz clocks
// Gambatte is going to run whatever it feels like, and report what it ran into nsamp
// Therefore we should track it and factor this in next frame, to keep a consistent definition of 1 frame = 35112 cycles
LibGambatte.gambatte_runfor(GambatteState, VideoBuffer, 160, soundbuff, ref nsamp);
_cycleCount += (ulong)nsamp;
_nextRunAdjust = 35112 - nsamp;
if (rendersound)
{
soundbuffcontains = (int)nsamp;