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Sleep between frames to save CPU cycles

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GoaLitiuM
2021-05-29 20:15:29 +03:00
parent cc60814334
commit e06200926f
3 changed files with 62 additions and 50 deletions
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61
Source/Engine/Engine/Time.cpp
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@@ -70,6 +70,7 @@ void Time::TickData::OnBeforeRun(float targetFps, double currentTime)
LastLength = static_cast<double>(DeltaTime.Ticks) / Constants::TicksPerSecond;
LastBegin = currentTime - LastLength;
LastEnd = currentTime;
NextBegin = targetFps > ZeroTolerance ? LastBegin + (1.0f / targetFps) : 0.0;
}
void Time::TickData::OnReset(float targetFps, double currentTime)
@@ -91,10 +92,18 @@ bool Time::TickData::OnTickBegin(float targetFps, float maxDeltaTime)
}
else
{
deltaTime = Math::Clamp(time - LastBegin, 0.0, (double)maxDeltaTime);
const double minDeltaTime = targetFps > ZeroTolerance ? 1.0 / (double)targetFps : 0.0;
if (deltaTime < minDeltaTime)
if (time < NextBegin)
return false;
deltaTime = Math::Max((time - LastBegin), 0.0);
if (deltaTime > maxDeltaTime)
{
deltaTime = (double)maxDeltaTime;
NextBegin = time;
}
if (targetFps > ZeroTolerance)
NextBegin += (1.0 / targetFps);
}
// Update data
@@ -135,10 +144,19 @@ bool Time::FixedStepTickData::OnTickBegin(float targetFps, float maxDeltaTime)
}
else
{
deltaTime = Math::Clamp(time - LastBegin, 0.0, (double)maxDeltaTime);
minDeltaTime = targetFps > ZeroTolerance ? 1.0 / (double)targetFps : 0.0;
if (deltaTime < minDeltaTime)
if (time < NextBegin)
return false;
minDeltaTime = targetFps > ZeroTolerance ? 1.0 / targetFps : 0.0;
deltaTime = Math::Max((time - LastBegin), 0.0);
if (deltaTime > maxDeltaTime)
{
deltaTime = (double)maxDeltaTime;
NextBegin = time;
}
if (targetFps > ZeroTolerance)
NextBegin += (1.0 / targetFps);
}
Samples.Add(deltaTime);
@@ -158,26 +176,23 @@ bool Time::FixedStepTickData::OnTickBegin(float targetFps, float maxDeltaTime)
return true;
}
Time::TickData* Time::GetHighestFrequency(float& fps)
double Time::GetNextTick()
{
const auto updateFps = UpdateFPS;
const auto drawFps = DrawFPS;
const auto physicsFps = PhysicsFPS;
const double nextUpdate = Time::Update.NextBegin;
const double nextPhysics = Time::Physics.NextBegin;
const double nextDraw = Time::Draw.NextBegin;
if (physicsFps >= drawFps && physicsFps >= updateFps)
{
fps = physicsFps;
return &Physics;
}
double nextTick = MAX_double;
if (UpdateFPS > 0 && nextUpdate < nextTick)
nextTick = nextUpdate;
if (PhysicsFPS > 0 && nextPhysics < nextTick)
nextTick = nextPhysics;
if (DrawFPS > 0 && nextDraw < nextTick)
nextTick = nextDraw;
if (drawFps >= physicsFps && drawFps >= updateFps)
{
fps = drawFps;
return &Draw;
}
fps = updateFps;
return &Update;
if (nextTick == MAX_double)
return 0.0;
return nextTick;
}
void Time::SetGamePaused(bool value)