1 files changed, 55 insertions, 28 deletions

diff --git a/alc/effects/fshifter.cpp b/alc/effects/fshifter.cpp
index a6c2c747..addf512c 100644
--- a/alc/effects/fshifter.cpp
+++ b/alc/effects/fshifter.cpp
@@ -62,9 +62,10 @@ alignas(16) const std::array<ALdouble,HIL_SIZE> HannWindow = InitHannWindow();
 struct FshifterState final : public EffectState {
     /* Effect parameters */
     ALsizei  mCount{};
-    ALsizei  mPhaseStep{};
-    ALsizei  mPhase{};
-    ALdouble mLdSign{};
+    ALsizei  mPhaseStep[2]{};
+    ALsizei  mPhase[2]{};
+    ALdouble mSign[2]{};
+
 
     /*Effects buffers*/ 
     ALfloat   mInFIFO[HIL_SIZE]{};
@@ -76,8 +77,10 @@ struct FshifterState final : public EffectState {
     alignas(16) ALfloat mBufferOut[BUFFERSIZE]{};
 
     /* Effect gains for each output channel */
-    ALfloat mCurrentGains[MAX_OUTPUT_CHANNELS]{};
-    ALfloat mTargetGains[MAX_OUTPUT_CHANNELS]{};
+    struct {
+        ALfloat Current[MAX_OUTPUT_CHANNELS]{};
+        ALfloat Target[MAX_OUTPUT_CHANNELS]{};
+    }mGains[2];
 
 
     ALboolean deviceUpdate(const ALCdevice *device) override;
@@ -91,17 +94,20 @@ ALboolean FshifterState::deviceUpdate(const ALCdevice*)
 {
     /* (Re-)initializing parameters and clear the buffers. */
     mCount     = FIFO_LATENCY;
-    mPhaseStep = 0;
-    mPhase     = 0;
-    mLdSign    = 1.0;
 
+    std::fill(std::begin(mPhaseStep),   std::end(mPhaseStep),   0);
+    std::fill(std::begin(mPhase),       std::end(mPhase),       0);
+    std::fill(std::begin(mSign),        std::end(mSign),        1.0);
     std::fill(std::begin(mInFIFO),      std::end(mInFIFO),      0.0f);
     std::fill(std::begin(mOutFIFO),     std::end(mOutFIFO),     complex_d{});
     std::fill(std::begin(mOutputAccum), std::end(mOutputAccum), complex_d{});
     std::fill(std::begin(mAnalytic),    std::end(mAnalytic),    complex_d{});
 
-    std::fill(std::begin(mCurrentGains), std::end(mCurrentGains), 0.0f);
-    std::fill(std::begin(mTargetGains),  std::end(mTargetGains),  0.0f);
+    for (auto &gain : mGains)
+    {
+        std::fill(std::begin(gain.Current), std::end(gain.Current), 0.0f);
+        std::fill(std::begin(gain.Target), std::end(gain.Target), 0.0f);
+    }
 
     return AL_TRUE;
 }
@@ -111,29 +117,47 @@ void FshifterState::update(const ALCcontext *context, const ALeffectslot *slot,
     const ALCdevice *device{context->mDevice.get()};
 
     ALfloat step{props->Fshifter.Frequency / static_cast<ALfloat>(device->Frequency)};
-    mPhaseStep = fastf2i(minf(step, 0.5f) * FRACTIONONE);
+    mPhaseStep[0] = mPhaseStep[1]  = fastf2i(minf(step, 0.5f) * FRACTIONONE);
 
     switch(props->Fshifter.LeftDirection)
     {
         case AL_FREQUENCY_SHIFTER_DIRECTION_DOWN:
-            mLdSign = -1.0;
+            mSign[0] = -1.0;
             break;
 
         case AL_FREQUENCY_SHIFTER_DIRECTION_UP:
-            mLdSign = 1.0;
+            mSign[0] = 1.0;
             break;
 
         case AL_FREQUENCY_SHIFTER_DIRECTION_OFF:
-            mPhase = 0;
-            mPhaseStep = 0;
+            mPhase[0]     = 0;
+            mPhaseStep[0] = 0;
             break;
     }
 
-    ALfloat coeffs[MAX_AMBI_CHANNELS];
-    CalcDirectionCoeffs({0.0f, 0.0f, -1.0f}, 0.0f, coeffs);
+    switch (props->Fshifter.RightDirection)
+    {
+        case AL_FREQUENCY_SHIFTER_DIRECTION_DOWN:
+            mSign[1] = -1.0;
+        break;
+
+        case AL_FREQUENCY_SHIFTER_DIRECTION_UP:
+            mSign[1] = 1.0;
+        break;
+
+        case AL_FREQUENCY_SHIFTER_DIRECTION_OFF:
+             mPhase[1]     = 0;
+             mPhaseStep[1] = 0;
+             break;
+    }
+
+    ALfloat coeffs[2][MAX_AMBI_CHANNELS];
+    CalcDirectionCoeffs({-1.0f, 0.0f, -1.0f}, 0.0f, coeffs[0]);
+    CalcDirectionCoeffs({1.0f, 0.0f, -1.0f }, 0.0f, coeffs[1]);
 
     mOutTarget = target.Main->Buffer;
-    ComputePanGains(target.Main, coeffs, slot->Params.Gain, mTargetGains);
+    ComputePanGains(target.Main, coeffs[0], slot->Params.Gain, mGains[0].Target);
+    ComputePanGains(target.Main, coeffs[1], slot->Params.Gain, mGains[1].Target);
 }
 
 void FshifterState::process(const ALsizei samplesToDo, const FloatBufferLine *RESTRICT samplesIn, const ALsizei /*numInput*/, const al::span<FloatBufferLine> samplesOut)
@@ -185,19 +209,22 @@ void FshifterState::process(const ALsizei samplesToDo, const FloatBufferLine *RE
     }
 
     /* Process frequency shifter using the analytic signal obtained. */
-    for(k = 0;k < samplesToDo;k++)
+    for (ALsizei c{0}; c < 2; c++)
     {
-        double phase = mPhase * ((1.0/FRACTIONONE) * al::MathDefs<double>::Tau());
-        BufferOut[k] = static_cast<float>(mOutdata[k].real()*std::cos(phase) +
-            mOutdata[k].imag()*std::sin(phase)*mLdSign);
+        for (k = 0; k < samplesToDo; k++)
+        {
+            double phase = mPhase[c] * ((1.0 / FRACTIONONE) * al::MathDefs<double>::Tau());
+            BufferOut[k] = static_cast<float>(mOutdata[k].real()*std::cos(phase) +
+                mOutdata[k].imag()*std::sin(phase)*mSign[c]);
 
-        mPhase += mPhaseStep;
-        mPhase &= FRACTIONMASK;
-    }
+            mPhase[c] += mPhaseStep[c];
+            mPhase[c] &= FRACTIONMASK;
+        }
 
-    /* Now, mix the processed sound data to the output. */
-    MixSamples(BufferOut, samplesOut, mCurrentGains, mTargetGains, maxi(samplesToDo, 512), 0,
-        samplesToDo);
+        /* Now, mix the processed sound data to the output. */
+        MixSamples(BufferOut, samplesOut, mGains[c].Current, mGains[c].Target, maxi(samplesToDo, 512), 0,
+            samplesToDo);
+    }
 }