Duckstation/src/core/timers.h

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#pragma once
#include "common/bitfield.h"
#include "types.h"
#include <array>
#include <memory>
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class StateWrapper;
class System;
class TimingEvent;
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class InterruptController;
class GPU;
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class Timers
{
public:
Timers();
~Timers();
void Initialize(System* system, InterruptController* interrupt_controller, GPU* gpu);
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void Reset();
bool DoState(StateWrapper& sw);
void SetGate(u32 timer, bool state);
void DrawDebugStateWindow();
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// dot clock/hblank/sysclk div 8
bool IsUsingExternalClock(u32 timer) const { return m_states[timer].external_counting_enabled; }
// queries for GPU
bool IsExternalIRQEnabled(u32 timer) const
{
const CounterState& cs = m_states[timer];
return (cs.external_counting_enabled && (cs.mode.bits & ((1u << 4) | (1u << 5))) != 0);
}
TickCount GetTicksUntilIRQ(u32 timer) const;
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void AddTicks(u32 timer, TickCount ticks);
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u32 ReadRegister(u32 offset);
void WriteRegister(u32 offset, u32 value);
// changing interfaces
void SetGPU(GPU* gpu) { m_gpu = gpu; }
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private:
static constexpr u32 NUM_TIMERS = 3;
enum class SyncMode : u8
{
PauseOnGate = 0,
ResetOnGate = 1,
ResetAndRunOnGate = 2,
FreeRunOnGate = 3
};
union CounterMode
{
u32 bits;
BitField<u32, bool, 0, 1> sync_enable;
BitField<u32, SyncMode, 1, 2> sync_mode;
BitField<u32, bool, 3, 1> reset_at_target;
BitField<u32, bool, 4, 1> irq_at_target;
BitField<u32, bool, 5, 1> irq_on_overflow;
BitField<u32, bool, 6, 1> irq_repeat;
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BitField<u32, bool, 7, 1> irq_pulse_n;
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BitField<u32, u8, 8, 2> clock_source;
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BitField<u32, bool, 10, 1> interrupt_request_n;
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BitField<u32, bool, 11, 1> reached_target;
BitField<u32, bool, 12, 1> reached_overflow;
};
struct CounterState
{
CounterMode mode;
u32 counter;
u32 target;
bool gate;
bool use_external_clock;
bool external_counting_enabled;
bool counting_enabled;
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bool irq_done;
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};
void UpdateCountingEnabled(CounterState& cs);
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void UpdateIRQ(u32 index);
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void AddSysClkTicks(TickCount sysclk_ticks);
TickCount GetTicksUntilNextInterrupt() const;
void UpdateSysClkEvent();
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System* m_system = nullptr;
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InterruptController* m_interrupt_controller = nullptr;
GPU* m_gpu = nullptr;
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std::unique_ptr<TimingEvent> m_sysclk_event;
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std::array<CounterState, NUM_TIMERS> m_states{};
u32 m_sysclk_div_8_carry = 0; // partial ticks for timer 3 with sysclk/8
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};