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Use sub-tic accuracy for smooth sine quakes

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- Converting the wave speed back to floats, since I'm using sin() instead
  of the finesine table now.
- Pre-shift the quake intensities to avoid extra shifting in GetModIntensity.
- Loading old saves will shift the intensities to fixed point but will not
  convert the fixed wave speeds to floats. The chances of this
  being in a savegame where the speeds are non-zero is pretty much nil,
  and int and floating point 0 are bitwise identical (not counting -0.0).
This commit is contained in:
Randy Heit 2015-03-02 19:17:24 -06:00
commit 156d1e61fd
4 changed files with 26 additions and 28 deletions
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38
src/g_shared/a_quake.cpp
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@ -35,23 +35,23 @@ DEarthquake::DEarthquake()
DEarthquake::DEarthquake (AActor *center, int intensityX, int intensityY, int intensityZ, int duration,
int damrad, int tremrad, FSoundID quakesound, int flags,
fixed_t waveSpeedX, fixed_t waveSpeedY, fixed_t waveSpeedZ)
double waveSpeedX, double waveSpeedY, double waveSpeedZ)
: DThinker(STAT_EARTHQUAKE)
{
m_QuakeSFX = quakesound;
m_Spot = center;
// Radii are specified in tile units (64 pixels)
m_DamageRadius = damrad << (FRACBITS);
m_TremorRadius = tremrad << (FRACBITS);
m_IntensityX = intensityX;
m_IntensityY = intensityY;
m_IntensityZ = intensityZ;
m_DamageRadius = damrad << FRACBITS;
m_TremorRadius = tremrad << FRACBITS;
m_IntensityX = intensityX << FRACBITS;
m_IntensityY = intensityY << FRACBITS;
m_IntensityZ = intensityZ << FRACBITS;
m_CountdownStart = duration;
m_Countdown = duration;
m_Flags = flags;
m_WaveSpeedX = waveSpeedX;
m_WaveSpeedY = waveSpeedY;
m_WaveSpeedZ = waveSpeedZ;
m_WaveSpeedX = (float)waveSpeedX;
m_WaveSpeedY = (float)waveSpeedY;
m_WaveSpeedZ = (float)waveSpeedZ;
}
//==========================================================================
@ -87,6 +87,9 @@ void DEarthquake::Serialize (FArchive &arc)
if (SaveVersion < 4521)
{
m_WaveSpeedX = m_WaveSpeedY = m_WaveSpeedZ = 0;
m_IntensityX <<= FRACBITS;
m_IntensityY <<= FRACBITS;
m_IntensityZ <<= FRACBITS;
}
else
{
@ -163,15 +166,14 @@ void DEarthquake::Tick ()
}
}
fixed_t DEarthquake::GetModWave(fixed_t waveMultiplier) const
fixed_t DEarthquake::GetModWave(double waveMultiplier) const
{
//QF_WAVE converts intensity into amplitude and unlocks a new property, the wave length.
//This is, in short, waves per second (full cycles, mind you, from 0 to 360.)
//Named waveMultiplier because that's as the name implies: adds more waves per second.
fixed_t wavesPerSecond = (waveMultiplier >> 15) * m_Countdown % (TICRATE * 2);
fixed_t index = ((wavesPerSecond * (FINEANGLES / 2)) / (TICRATE));
return finesine[index & FINEMASK];
double time = m_Countdown - FIXED2DBL(r_TicFrac);
return FLOAT2FIXED(sin(waveMultiplier * time * (M_PI * 2 / TICRATE)));
}
//==========================================================================
@ -182,7 +184,7 @@ fixed_t DEarthquake::GetModWave(fixed_t waveMultiplier) const
//
//==========================================================================
fixed_t DEarthquake::GetModIntensity(int intensity) const
fixed_t DEarthquake::GetModIntensity(fixed_t intensity) const
{
assert(m_CountdownStart >= m_Countdown);
intensity += intensity; // always doubled
@ -209,11 +211,7 @@ fixed_t DEarthquake::GetModIntensity(int intensity) const
scalar = m_CountdownStart - m_Countdown;
}
assert(m_CountdownStart > 0);
intensity = intensity * (scalar << FRACBITS) / m_CountdownStart;
}
else
{
intensity <<= FRACBITS;
intensity = Scale(intensity, scalar, m_CountdownStart);
}
return intensity;
}
@ -305,7 +303,7 @@ int DEarthquake::StaticGetQuakeIntensities(AActor *victim, FQuakeJiggers &jigger
bool P_StartQuakeXYZ(AActor *activator, int tid, int intensityX, int intensityY, int intensityZ, int duration,
int damrad, int tremrad, FSoundID quakesfx, int flags,
fixed_t waveSpeedX, fixed_t waveSpeedY, fixed_t waveSpeedZ)
double waveSpeedX, double waveSpeedY, double waveSpeedZ)
{
AActor *center;
bool res = false;