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System: Implement CPU overclocking [SAVEVERSION+]

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Partial credit to @CookiePLMonster as well.
This commit is contained in:
Connor McLaughlin
2020-09-29 23:29:28 +10:00
parent 8f9f039665
commit 27697d0508
19 changed files with 249 additions and 36 deletions
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25
src/core/gpu.cpp
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@ -57,6 +57,11 @@ void GPU::UpdateSettings()
UpdateCRTCDisplayParameters();
}
void GPU::CPUClockChanged()
{
UpdateCRTCConfig();
}
void GPU::UpdateResolutionScale() {}
std::tuple<u32, u32> GPU::GetEffectiveDisplayResolution()
@ -427,8 +432,9 @@ float GPU::ComputeHorizontalFrequency() const
{
const CRTCState& cs = m_crtc_state;
TickCount fractional_ticks = 0;
return static_cast<float>(static_cast<double>(SystemTicksToCRTCTicks(MASTER_CLOCK, &fractional_ticks)) /
static_cast<double>(cs.horizontal_total));
return static_cast<float>(
static_cast<double>(SystemTicksToCRTCTicks(System::GetTicksPerSecond(), &fractional_ticks)) /
static_cast<double>(cs.horizontal_total));
}
float GPU::ComputeVerticalFrequency() const
@ -436,8 +442,9 @@ float GPU::ComputeVerticalFrequency() const
const CRTCState& cs = m_crtc_state;
const TickCount ticks_per_frame = cs.horizontal_total * cs.vertical_total;
TickCount fractional_ticks = 0;
return static_cast<float>(static_cast<double>(SystemTicksToCRTCTicks(MASTER_CLOCK, &fractional_ticks)) /
static_cast<double>(ticks_per_frame));
return static_cast<float>(
static_cast<double>(SystemTicksToCRTCTicks(System::GetTicksPerSecond(), &fractional_ticks)) /
static_cast<double>(ticks_per_frame));
}
float GPU::GetDisplayAspectRatio() const
@ -459,7 +466,7 @@ void GPU::UpdateCRTCConfig()
cs.current_scanline %= PAL_TOTAL_LINES;
cs.horizontal_total = PAL_TICKS_PER_LINE;
cs.horizontal_sync_start = PAL_HSYNC_TICKS;
cs.current_tick_in_scanline %= PAL_TICKS_PER_LINE;
cs.current_tick_in_scanline %= System::ScaleTicksToOverclock(PAL_TICKS_PER_LINE);
}
else
{
@ -467,7 +474,7 @@ void GPU::UpdateCRTCConfig()
cs.current_scanline %= NTSC_TOTAL_LINES;
cs.horizontal_total = NTSC_TICKS_PER_LINE;
cs.horizontal_sync_start = NTSC_HSYNC_TICKS;
cs.current_tick_in_scanline %= NTSC_TICKS_PER_LINE;
cs.current_tick_in_scanline %= System::ScaleTicksToOverclock(NTSC_TICKS_PER_LINE);
}
cs.in_hblank = (cs.current_tick_in_scanline >= cs.horizontal_sync_start);
@ -498,6 +505,12 @@ void GPU::UpdateCRTCConfig()
cs.current_tick_in_scanline %= NTSC_TICKS_PER_LINE;
}
cs.horizontal_display_start =
static_cast<u16>(System::ScaleTicksToOverclock(static_cast<TickCount>(cs.horizontal_display_start)));
cs.horizontal_display_end =
static_cast<u16>(System::ScaleTicksToOverclock(static_cast<TickCount>(cs.horizontal_display_end)));
cs.horizontal_total = static_cast<u16>(System::ScaleTicksToOverclock(static_cast<TickCount>(cs.horizontal_total)));
System::SetThrottleFrequency(ComputeVerticalFrequency());
UpdateCRTCDisplayParameters();