83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include "Common/CommonTypes.h"
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namespace SystemTimers
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{
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/*
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GameCube MHz
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flipper <-> ARAM bus: 81 (DSP)
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gekko <-> flipper bus: 162
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flipper <-> 1T-SRAM bus: 324
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gekko: 486
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These contain some guesses:
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Wii MHz
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hollywood <-> GDDR3 RAM bus: ??? no idea really
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broadway <-> hollywood bus: 243
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hollywood <-> 1T-SRAM bus: 486
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broadway: 729
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*/
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// Ratio of TB and Decrementer to clock cycles.
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// TB clk is 1/4 of BUS clk. And it seems BUS clk is really 1/3 of CPU clk.
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// So, ratio is 1 / (1/4 * 1/3 = 1/12) = 12.
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// note: ZWW is ok and faster with TIMER_RATIO=8 though.
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// !!! POSSIBLE STABLE PERF BOOST HACK THERE !!!
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enum
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{
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TIMER_RATIO = 12
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};
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struct TimeBaseTick
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{
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constexpr TimeBaseTick() = default;
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constexpr explicit TimeBaseTick(u64 tb_ticks) : cpu_ticks(tb_ticks * TIMER_RATIO) {}
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constexpr operator u64() const { return cpu_ticks; }
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u64 cpu_ticks = 0;
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};
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enum class Mode
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{
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GC,
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Wii,
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};
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u32 GetTicksPerSecond();
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void PreInit();
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void Init();
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void Shutdown();
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void ChangePPCClock(Mode mode);
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// Notify timing system that somebody wrote to the decrementer
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void DecrementerSet();
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u32 GetFakeDecrementer();
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void TimeBaseSet();
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u64 GetFakeTimeBase();
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// Custom RTC
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s64 GetLocalTimeRTCOffset();
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// Returns an estimate of how fast/slow the emulation is running (excluding throttling induced sleep
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// time). The estimate is computed over the last 1s of emulated time. Example values:
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//
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// - 0.5: the emulator is running at 50% speed (falling behind).
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// - 1.0: the emulator is running at 100% speed.
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// - 2.0: the emulator is running at 200% speed (or 100% speed but sleeping half of the time).
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double GetEstimatedEmulationPerformance();
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} // namespace SystemTimers
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inline namespace SystemTimersLiterals
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{
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/// Converts timebase ticks to clock ticks.
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constexpr SystemTimers::TimeBaseTick operator""_tbticks(unsigned long long value)
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{
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return SystemTimers::TimeBaseTick(value);
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}
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} // namespace SystemTimersLiterals
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