Avoid calculating the filter coefficients multiple times

1 files changed, 36 insertions, 24 deletions

diff --git a/Alc/ALu.c b/Alc/ALu.c
index 22aca28a..28dfd7c1 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -953,19 +953,25 @@ static void CalcPanningAndFilters(ALvoice *voice, const ALfloat Distance, const
         ALfloat lfScale = props->Direct.LFReference / Frequency;
         ALfloat gainHF = maxf(DryGainHF, 0.001f); /* Limit -60dB */
         ALfloat gainLF = maxf(DryGainLF, 0.001f);
-        for(c = 0;c < num_channels;c++)
+
+        voice->Direct.Params[0].FilterType = AF_None;
+        if(gainHF != 1.0f) voice->Direct.Params[0].FilterType |= AF_LowPass;
+        if(gainLF != 1.0f) voice->Direct.Params[0].FilterType |= AF_HighPass;
+        ALfilterState_setParams(
+            &voice->Direct.Params[0].LowPass, ALfilterType_HighShelf,
+            gainHF, hfScale, calc_rcpQ_from_slope(gainHF, 1.0f)
+        );
+        ALfilterState_setParams(
+            &voice->Direct.Params[0].HighPass, ALfilterType_LowShelf,
+            gainLF, lfScale, calc_rcpQ_from_slope(gainLF, 1.0f)
+        );
+        for(c = 1;c < num_channels;c++)
         {
-            voice->Direct.Params[c].FilterType = AF_None;
-            if(gainHF != 1.0f) voice->Direct.Params[c].FilterType |= AF_LowPass;
-            if(gainLF != 1.0f) voice->Direct.Params[c].FilterType |= AF_HighPass;
-            ALfilterState_setParams(
-                &voice->Direct.Params[c].LowPass, ALfilterType_HighShelf,
-                gainHF, hfScale, calc_rcpQ_from_slope(gainHF, 1.0f)
-            );
-            ALfilterState_setParams(
-                &voice->Direct.Params[c].HighPass, ALfilterType_LowShelf,
-                gainLF, lfScale, calc_rcpQ_from_slope(gainLF, 1.0f)
-            );
+            voice->Direct.Params[c].FilterType = voice->Direct.Params[0].FilterType;
+            ALfilterState_copyParams(&voice->Direct.Params[c].LowPass,
+                                     &voice->Direct.Params[0].LowPass);
+            ALfilterState_copyParams(&voice->Direct.Params[c].HighPass,
+                                     &voice->Direct.Params[0].HighPass);
         }
     }
     for(i = 0;i < NumSends;i++)
@@ -974,19 +980,25 @@ static void CalcPanningAndFilters(ALvoice *voice, const ALfloat Distance, const
         ALfloat lfScale = props->Send[i].LFReference / Frequency;
         ALfloat gainHF = maxf(WetGainHF[i], 0.001f);
         ALfloat gainLF = maxf(WetGainLF[i], 0.001f);
-        for(c = 0;c < num_channels;c++)
+
+        voice->Send[i].Params[0].FilterType = AF_None;
+        if(gainHF != 1.0f) voice->Send[i].Params[0].FilterType |= AF_LowPass;
+        if(gainLF != 1.0f) voice->Send[i].Params[0].FilterType |= AF_HighPass;
+        ALfilterState_setParams(
+            &voice->Send[i].Params[0].LowPass, ALfilterType_HighShelf,
+            gainHF, hfScale, calc_rcpQ_from_slope(gainHF, 1.0f)
+        );
+        ALfilterState_setParams(
+            &voice->Send[i].Params[0].HighPass, ALfilterType_LowShelf,
+            gainLF, lfScale, calc_rcpQ_from_slope(gainLF, 1.0f)
+        );
+        for(c = 1;c < num_channels;c++)
         {
-            voice->Send[i].Params[c].FilterType = AF_None;
-            if(gainHF != 1.0f) voice->Send[i].Params[c].FilterType |= AF_LowPass;
-            if(gainLF != 1.0f) voice->Send[i].Params[c].FilterType |= AF_HighPass;
-            ALfilterState_setParams(
-                &voice->Send[i].Params[c].LowPass, ALfilterType_HighShelf,
-                gainHF, hfScale, calc_rcpQ_from_slope(gainHF, 1.0f)
-            );
-            ALfilterState_setParams(
-                &voice->Send[i].Params[c].HighPass, ALfilterType_LowShelf,
-                gainLF, lfScale, calc_rcpQ_from_slope(gainLF, 1.0f)
-            );
+            voice->Send[i].Params[c].FilterType = voice->Send[i].Params[0].FilterType;
+            ALfilterState_copyParams(&voice->Send[i].Params[c].LowPass,
+                                     &voice->Send[i].Params[0].LowPass);
+            ALfilterState_copyParams(&voice->Send[i].Params[c].HighPass,
+                                     &voice->Send[i].Params[0].HighPass);
         }
     }
 }