Apply a distance decay on the source send for the reverb's DecayLFRatio

3 files changed, 12 insertions, 2 deletions

diff --git a/Alc/ALu.c b/Alc/ALu.c
index 12708cc5..1aa35cb7 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -457,6 +457,7 @@ static bool CalcEffectSlotParams(ALeffectslot *slot, ALCcontext *context, bool f
         {
             slot->Params.RoomRolloff = props->Props.Reverb.RoomRolloffFactor;
             slot->Params.DecayTime = props->Props.Reverb.DecayTime;
+            slot->Params.DecayLFRatio = props->Props.Reverb.DecayLFRatio;
             slot->Params.DecayHFRatio = props->Props.Reverb.DecayHFRatio;
             slot->Params.DecayHFLimit = props->Props.Reverb.DecayHFLimit;
             slot->Params.AirAbsorptionGainHF = props->Props.Reverb.AirAbsorptionGainHF;
@@ -465,6 +466,7 @@ static bool CalcEffectSlotParams(ALeffectslot *slot, ALCcontext *context, bool f
         {
             slot->Params.RoomRolloff = 0.0f;
             slot->Params.DecayTime = 0.0f;
+            slot->Params.DecayLFRatio = 0.0f;
             slot->Params.DecayHFRatio = 0.0f;
             slot->Params.DecayHFLimit = AL_FALSE;
             slot->Params.AirAbsorptionGainHF = 1.0f;
@@ -1186,6 +1188,7 @@ static void CalcAttnSourceParams(ALvoice *voice, const struct ALvoiceProps *prop
     ALeffectslot *SendSlots[MAX_SENDS];
     ALfloat RoomRolloff[MAX_SENDS];
     ALfloat DecayDistance[MAX_SENDS];
+    ALfloat DecayLFDistance[MAX_SENDS];
     ALfloat DecayHFDistance[MAX_SENDS];
     ALfloat DryGain, DryGainHF, DryGainLF;
     ALfloat WetGain[MAX_SENDS];
@@ -1210,6 +1213,7 @@ static void CalcAttnSourceParams(ALvoice *voice, const struct ALvoiceProps *prop
             SendSlots[i] = NULL;
             RoomRolloff[i] = 0.0f;
             DecayDistance[i] = 0.0f;
+            DecayLFDistance[i] = 0.0f;
             DecayHFDistance[i] = 0.0f;
         }
         else if(SendSlots[i]->Params.AuxSendAuto)
@@ -1220,6 +1224,7 @@ static void CalcAttnSourceParams(ALvoice *voice, const struct ALvoiceProps *prop
              */
             DecayDistance[i] = SendSlots[i]->Params.DecayTime *
                                Listener->Params.ReverbSpeedOfSound;
+            DecayLFDistance[i] = DecayDistance[i] * SendSlots[i]->Params.DecayLFRatio;
             DecayHFDistance[i] = DecayDistance[i] * SendSlots[i]->Params.DecayHFRatio;
             if(SendSlots[i]->Params.DecayHFLimit)
             {
@@ -1242,6 +1247,7 @@ static void CalcAttnSourceParams(ALvoice *voice, const struct ALvoiceProps *prop
              * effect slot is the same as the dry path, sans filter effects */
             RoomRolloff[i] = props->RolloffFactor;
             DecayDistance[i] = 0.0f;
+            DecayLFDistance[i] = 0.0f;
             DecayHFDistance[i] = 0.0f;
         }
 
@@ -1386,7 +1392,7 @@ static void CalcAttnSourceParams(ALvoice *voice, const struct ALvoiceProps *prop
              */
             for(i = 0;i < NumSends;i++)
             {
-                ALfloat gain;
+                ALfloat gain, gainhf, gainlf;
 
                 if(!(DecayDistance[i] > 0.0f))
                     continue;
@@ -1398,8 +1404,10 @@ static void CalcAttnSourceParams(ALvoice *voice, const struct ALvoiceProps *prop
                  */
                 if(gain > 0.0f)
                 {
-                    ALfloat gainhf = powf(REVERB_DECAY_GAIN, meters_base/DecayHFDistance[i]);
+                    gainhf = powf(REVERB_DECAY_GAIN, meters_base/DecayHFDistance[i]);
                     WetGainHF[i] *= minf(gainhf / gain, 1.0f);
+                    gainlf = powf(REVERB_DECAY_GAIN, meters_base/DecayLFDistance[i]);
+                    WetGainLF[i] *= minf(gainlf / gain, 1.0f);
                 }
             }
         }
diff --git a/OpenAL32/Include/alAuxEffectSlot.h b/OpenAL32/Include/alAuxEffectSlot.h
index 36f09782..61c72153 100644
--- a/OpenAL32/Include/alAuxEffectSlot.h
+++ b/OpenAL32/Include/alAuxEffectSlot.h
@@ -127,6 +127,7 @@ typedef struct ALeffectslot {
 
         ALfloat RoomRolloff; /* Added to the source's room rolloff, not multiplied. */
         ALfloat DecayTime;
+        ALfloat DecayLFRatio;
         ALfloat DecayHFRatio;
         ALboolean DecayHFLimit;
         ALfloat AirAbsorptionGainHF;
diff --git a/OpenAL32/alAuxEffectSlot.c b/OpenAL32/alAuxEffectSlot.c
index d4e6bf75..301244a0 100644
--- a/OpenAL32/alAuxEffectSlot.c
+++ b/OpenAL32/alAuxEffectSlot.c
@@ -686,6 +686,7 @@ ALenum InitEffectSlot(ALeffectslot *slot)
     slot->Params.EffectState = slot->Effect.State;
     slot->Params.RoomRolloff = 0.0f;
     slot->Params.DecayTime = 0.0f;
+    slot->Params.DecayLFRatio = 0.0f;
     slot->Params.DecayHFRatio = 0.0f;
     slot->Params.DecayHFLimit = AL_FALSE;
     slot->Params.AirAbsorptionGainHF = 1.0f;