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GPU: Run draw clock at sysclk * 2

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This commit is contained in:
Connor McLaughlin
2020-06-13 01:28:49 +10:00
parent 0dfb9f7d90
commit dad63f2303
4 changed files with 150 additions and 98 deletions
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32
src/core/gpu.h
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@ -143,16 +143,17 @@ public:
void DMAWrite(const u32* words, u32 word_count);
/// Returns the number of pending GPU ticks.
TickCount GetPendingGPUTicks() const;
TickCount GetPendingCRTCTicks() const;
TickCount GetPendingCommandTicks() const;
/// Returns true if enough ticks have passed for the raster to be on the next line.
bool IsRasterScanlinePending() const;
bool IsCRTCScanlinePending() const;
/// Returns true if a raster scanline or command execution is pending.
bool IsRasterScanlineOrCommandPending() const;
bool IsCommandCompletionPending() const;
// Synchronizes the CRTC, updating the hblank timer.
void Synchronize();
void SynchronizeCRTC();
// Recompile shaders/recreate framebuffers when needed.
virtual void UpdateSettings();
@ -173,8 +174,15 @@ public:
void UpdateHardwareType();
protected:
TickCount GPUTicksToSystemTicks(TickCount gpu_ticks, TickCount fractional_ticks) const;
TickCount SystemTicksToGPUTicks(TickCount sysclk_ticks, TickCount* fractional_ticks) const;
TickCount CRTCTicksToSystemTicks(TickCount crtc_ticks, TickCount fractional_ticks) const;
TickCount SystemTicksToCRTCTicks(TickCount sysclk_ticks, TickCount* fractional_ticks) const;
// The GPU internally appears to run at 2x the system clock.
ALWAYS_INLINE static constexpr TickCount GPUTicksToSystemTicks(TickCount gpu_ticks)
{
return std::max<TickCount>(gpu_ticks >> 1, 1);
}
ALWAYS_INLINE static constexpr TickCount SystemTicksToGPUTicks(TickCount sysclk_ticks) { return sysclk_ticks << 1; }
// Helper/format conversion functions.
static constexpr u8 Convert5To8(u8 x5) { return (x5 << 3) | (x5 & 7); }
@ -332,13 +340,16 @@ protected:
void UpdateCRTCDisplayParameters();
// Update ticks for this execution slice
void UpdateSliceTicks();
void UpdateCRTCTickEvent();
void UpdateCommandTickEvent();
// Updates dynamic bits in GPUSTAT (ready to send VRAM/ready to receive DMA)
void UpdateDMARequest();
void UpdateGPUIdle();
// Ticks for hblank/vblank.
void Execute(TickCount ticks);
void CRTCTickEvent(TickCount ticks);
void CommandTickEvent(TickCount ticks);
/// Returns false if the DAC is loading any data from VRAM.
ALWAYS_INLINE bool IsDisplayDisabled() const
@ -419,7 +430,8 @@ protected:
InterruptController* m_interrupt_controller = nullptr;
Timers* m_timers = nullptr;
std::unique_ptr<TimingEvent> m_tick_event;
std::unique_ptr<TimingEvent> m_crtc_tick_event;
std::unique_ptr<TimingEvent> m_command_tick_event;
// Pointer to VRAM, used for reads/writes. In the hardware backends, this is the shadow buffer.
u16* m_vram_ptr = nullptr;
@ -649,8 +661,8 @@ protected:
} m_crtc_state = {};
BlitterState m_blitter_state = BlitterState::Idle;
TickCount m_command_ticks = 0;
u32 m_command_total_words = 0;
TickCount m_pending_command_ticks = 0;
/// GPUREAD value for non-VRAM-reads.
u32 m_GPUREAD_latch = 0;