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Use the average frame time to limit frame rate.

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Helps a lot with games that don't run at 60fps internally (ex.: FFX).
This commit is contained in:
Jean-Philip Desjardins 2021-12-15 17:28:48 -05:00
parent 695cb21e06
commit 130dcb7d51
2 changed files with 23 additions and 3 deletions
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18
Source/FrameLimiter.cpp
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@ -11,6 +11,10 @@ CFrameLimiter::CFrameLimiter()
#ifdef _WIN32
timeBeginPeriod(1);
#endif
for (uint32 i = 0; i < MAX_FRAMETIMES; i++)
{
m_frameTimes[i] = std::chrono::microseconds(0);
}
}
CFrameLimiter::~CFrameLimiter()
@ -32,9 +36,17 @@ void CFrameLimiter::EndFrame()
assert(m_frameStarted);
auto currentFrameTime = std::chrono::high_resolution_clock::now();
auto frameDuration = std::chrono::duration_cast<std::chrono::microseconds>(currentFrameTime - m_lastFrameTime);
if(frameDuration < m_minFrameDuration)
m_frameTimes[m_frameTimeIndex++] = frameDuration;
m_frameTimeIndex %= MAX_FRAMETIMES;
std::chrono::microseconds averageFrameTime = std::chrono::microseconds(0);
for(uint32 i = 0; i < MAX_FRAMETIMES; i++)
{
auto delay = m_minFrameDuration - frameDuration;
averageFrameTime += m_frameTimes[i];
}
averageFrameTime /= MAX_FRAMETIMES;
if(averageFrameTime < m_minFrameDuration)
{
auto delay = m_minFrameDuration - averageFrameTime;
#ifdef _WIN32
{
LARGE_INTEGER ft = {};
@ -47,7 +59,7 @@ void CFrameLimiter::EndFrame()
}
#elif defined(__APPLE__)
//Sleeping for the whole delay on macOS/iOS doesn't provide a good enough resolution
while(frameDuration < m_minFrameDuration)
while(averageFrameTime < m_minFrameDuration)
{
std::this_thread::sleep_for(std::chrono::microseconds(250));
currentFrameTime = std::chrono::high_resolution_clock::now();

8
Source/FrameLimiter.h
View file

@ -17,6 +17,14 @@ public:
private:
typedef std::chrono::high_resolution_clock::time_point TimePoint;
enum
{
MAX_FRAMETIMES = 4,
};
std::chrono::microseconds m_frameTimes[MAX_FRAMETIMES];
uint32 m_frameTimeIndex = 0;
std::chrono::microseconds m_minFrameDuration = std::chrono::microseconds(0);
bool m_frameStarted = false;
TimePoint m_lastFrameTime;