67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
#include "FPSLimiter.h"
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#include <Windows.h>
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#include <chrono>
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#include <thread>
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#include <cmath>
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#include <cstdio>
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#include <tchar.h>
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using dsec = std::chrono::duration<double>;
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using seconds = std::chrono::seconds;
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// this is pretty much just lybxlpsv's limiter, but removed from GLComponent
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namespace TLAC::Components
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{
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using namespace std::chrono;
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static std::chrono::time_point mBeginFrame = system_clock::now();
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static std::chrono::time_point prevTimeInSeconds = time_point_cast<seconds>(mBeginFrame);
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const LPCTSTR config_file_name = _T(".\\config.ini");
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int fpsLimit = GetPrivateProfileIntW(L"graphics", L"fps.limit", 0, config_file_name);
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FPSLimiter::FPSLimiter()
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{
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}
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FPSLimiter::~FPSLimiter()
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{
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}
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const char* FPSLimiter::GetDisplayName()
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{
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return "fps_limiter";
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}
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void FPSLimiter::Initialize(ComponentsManager* manager)
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{
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mBeginFrame = std::chrono::system_clock::now();
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prevTimeInSeconds = std::chrono::time_point_cast<seconds>(mBeginFrame);
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frameCountPerSecond = 0;
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if(fpsLimit != 0)
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printf("FPSLimiter fpsLimit: %d\n", fpsLimit);
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}
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// I assume this gets called once per frame... if not this won't work
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void FPSLimiter::Update()
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{
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auto invFpsLimit = round<std::chrono::system_clock::duration>(dsec{ 1. / fpsLimit });
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auto mEndFrame = mBeginFrame + invFpsLimit;
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auto timeInSeconds = std::chrono::time_point_cast<seconds>(std::chrono::system_clock::now());
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++frameCountPerSecond;
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if (timeInSeconds > prevTimeInSeconds)
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{
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//printf("FPSLimiter::Update(): FPS: %d\n", frameCountPerSecond);
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frameCountPerSecond = 0;
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prevTimeInSeconds = timeInSeconds;
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}
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// This part keeps the frame rate.
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if (fpsLimit > 19) // not sure why lyb used 19 here
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std::this_thread::sleep_until(mEndFrame);
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mBeginFrame = mEndFrame;
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mEndFrame = mBeginFrame + invFpsLimit;
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}
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} |