84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <chrono>
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#include <mutex>
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#include "common/common_types.h"
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namespace Core {
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/**
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* Class to manage and query performance/timing statistics. All public functions of this class are
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* thread-safe unless stated otherwise.
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*/
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class PerfStats {
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public:
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using Clock = std::chrono::high_resolution_clock;
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struct Results {
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/// System FPS (LCD VBlanks) in Hz
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double system_fps;
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/// Game FPS (GSP frame submissions) in Hz
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double game_fps;
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/// Walltime per system frame, in seconds, excluding any waits
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double frametime;
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/// Ratio of walltime / emulated time elapsed
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double emulation_speed;
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};
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void BeginSystemFrame();
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void EndSystemFrame();
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void EndGameFrame();
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Results GetAndResetStats(u64 current_system_time_us);
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/**
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* Gets the ratio between walltime and the emulated time of the previous system frame. This is
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* useful for scaling inputs or outputs moving between the two time domains.
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*/
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double GetLastFrameTimeScale();
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private:
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std::mutex object_mutex;
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/// Point when the cumulative counters were reset
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Clock::time_point reset_point = Clock::now();
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/// System time when the cumulative counters were reset
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u64 reset_point_system_us = 0;
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/// Cumulative duration (excluding v-sync/frame-limiting) of frames since last reset
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Clock::duration accumulated_frametime = Clock::duration::zero();
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/// Cumulative number of system frames (LCD VBlanks) presented since last reset
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u32 system_frames = 0;
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/// Cumulative number of game frames (GSP frame submissions) since last reset
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u32 game_frames = 0;
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/// Point when the previous system frame ended
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Clock::time_point previous_frame_end = reset_point;
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/// Point when the current system frame began
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Clock::time_point frame_begin = reset_point;
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/// Total visible duration (including frame-limiting, etc.) of the previous system frame
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Clock::duration previous_frame_length = Clock::duration::zero();
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};
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class FrameLimiter {
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public:
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using Clock = std::chrono::high_resolution_clock;
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void DoFrameLimiting(u64 current_system_time_us);
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private:
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/// Emulated system time (in microseconds) at the last limiter invocation
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u64 previous_system_time_us = 0;
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/// Walltime at the last limiter invocation
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Clock::time_point previous_walltime = Clock::now();
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/// Accumulated difference between walltime and emulated time
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std::chrono::microseconds frame_limiting_delta_err{0};
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};
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} // namespace Core
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