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Fix crashes if the system clock moves backwards.

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Glenn Maynard
2004-02-20 21:41:37 +00:00
parent c3196a4a46
commit 96b719162f
1 changed files with 6 additions and 2 deletions
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stepmania/src/RageTimer.cpp
+6 -2
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@@ -29,7 +29,9 @@ void RageTimer::Touch()
float RageTimer::Ago() const float RageTimer::Ago() const
{ {
const RageTimer Now; const RageTimer Now;
return Now - *this;
/* If the system clock has moved backwards (for example, ntpd), don't return negative values. */
return max( 0.0f, Now - *this );
} }
float RageTimer::GetDeltaTime() float RageTimer::GetDeltaTime()
@@ -37,7 +39,9 @@ float RageTimer::GetDeltaTime()
const RageTimer Now; const RageTimer Now;
const float diff = Difference( Now, *this ); const float diff = Difference( Now, *this );
*this = Now; *this = Now;
return diff;
/* If the system clock has moved backwards (for example, ntpd), don't return negative values. */
return max( 0.0f, diff );
} }
/* Get a timer representing half of the time ago as this one. This is /* Get a timer representing half of the time ago as this one. This is