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GPU: Fix timer 1 IRQs sometimes triggering late

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Should hopefully fix missing voices in Akuji the Heartless.
This commit is contained in:
Connor McLaughlin
2020-04-28 20:30:44 +10:00
parent a5ff904b33
commit 5a1b00825d
3 changed files with 38 additions and 7 deletions
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18
src/core/gpu.cpp
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@ -568,20 +568,26 @@ TickCount GPU::GetPendingGPUTicks() const
void GPU::UpdateSliceTicks()
{
// figure out how many GPU ticks until the next vblank
// figure out how many GPU ticks until the next vblank or event
const TickCount lines_until_vblank =
(m_crtc_state.current_scanline >= m_crtc_state.vertical_display_end ?
(m_crtc_state.vertical_total - m_crtc_state.current_scanline + m_crtc_state.vertical_display_end) :
(m_crtc_state.vertical_display_end - m_crtc_state.current_scanline));
const TickCount ticks_until_vblank =
lines_until_vblank * m_crtc_state.horizontal_total - m_crtc_state.current_tick_in_scanline;
const TickCount lines_until_event = m_timers->IsExternalIRQEnabled(HBLANK_TIMER_INDEX) ?
std::min(m_timers->GetTicksUntilIRQ(HBLANK_TIMER_INDEX), lines_until_vblank) :
lines_until_vblank;
const TickCount ticks_until_event =
lines_until_event * m_crtc_state.horizontal_total - m_crtc_state.current_tick_in_scanline;
#if 0
const TickCount ticks_until_hblank =
(m_crtc_state.current_tick_in_scanline >= m_crtc_state.horizontal_display_end) ?
(m_crtc_state.horizontal_total - m_crtc_state.current_tick_in_scanline + m_crtc_state.horizontal_display_end) :
(m_crtc_state.horizontal_display_end - m_crtc_state.current_tick_in_scanline);
(m_crtc_state.horizontal_total - m_crtc_state.current_tick_in_scanline + m_crtc_state.horizontal_display_end) :
(m_crtc_state.horizontal_display_end - m_crtc_state.current_tick_in_scanline);
#endif
m_tick_event->Schedule(
GPUTicksToSystemTicks((m_command_ticks > 0) ? std::min(m_command_ticks, ticks_until_vblank) : ticks_until_vblank));
GPUTicksToSystemTicks((m_command_ticks > 0) ? std::min(m_command_ticks, ticks_until_event) : ticks_until_event));
}
bool GPU::IsRasterScanlinePending() const