Store the resampler as part of the source

Alc/ALu.c

@@ -455,6 +455,7 @@ static void CalcNonAttnSourceParams(ALvoice *voice, const struct ALvoiceProps *p
     else
         voice->Step = maxi(fastf2i(Pitch*FRACTIONONE + 0.5f), 1);
     BsincPrepare(voice->Step, &voice->ResampleState.bsinc);
+    voice->Resampler = SelectResampler(props->Resampler);
 
     /* Calculate gains */
     DryGain  = clampf(SourceVolume, MinVolume, MaxVolume);
@@ -1095,6 +1096,7 @@ static void CalcAttnSourceParams(ALvoice *voice, const struct ALvoiceProps *prop
     else
         voice->Step = maxi(fastf2i(Pitch*FRACTIONONE + 0.5f), 1);
     BsincPrepare(voice->Step, &voice->ResampleState.bsinc);
+    voice->Resampler = SelectResampler(props->Resampler);
 
     voice->Flags &= ~(VOICE_IS_HRTF | VOICE_HAS_NFC);
     if(Device->Render_Mode == HrtfRender)

Alc/mixer.c

@@ -53,7 +53,6 @@ enum Resampler ResamplerDefault = LinearResampler;
 
 static MixerFunc MixSamples = Mix_C;
 static HrtfMixerFunc MixHrtfSamples = MixHrtf_C;
-static ResamplerFunc ResampleSamples = Resample_point32_C;
 
 MixerFunc SelectMixer(void)
 {
@@ -177,7 +176,6 @@ void aluInitMixer(void)
 
     MixHrtfSamples = SelectHrtfMixer();
     MixSamples = SelectMixer();
-    ResampleSamples = SelectResampler(ResamplerDefault);
 }
 
 
@@ -295,7 +293,7 @@ ALboolean MixSource(ALvoice *voice, ALsource *Source, ALCdevice *Device, ALsizei
     IrSize = (Device->HrtfHandle ? Device->HrtfHandle->irSize : 0);
 
     Resample = ((increment == FRACTIONONE && DataPosFrac == 0) ?
-                Resample_copy32_C : ResampleSamples);
+                Resample_copy32_C : voice->Resampler);
 
     Counter = (voice->Flags&VOICE_IS_MOVING) ? SamplesToDo : 0;
     OutPos = 0;

OpenAL32/Include/alSource.h

@@ -43,6 +43,7 @@ typedef struct ALsource {
     ALboolean HeadRelative;
     ALboolean Looping;
     enum DistanceModel DistanceModel;
+    enum Resampler Resampler;
     ALboolean DirectChannels;
 
     ALboolean DryGainHFAuto;

OpenAL32/Include/alu.h

@@ -40,6 +40,14 @@ struct ALvoice;
 struct ALeffectslot;
 
 
+enum Resampler {
+    PointResampler,
+    LinearResampler,
+    FIR4Resampler,
+    BSincResampler,
+};
+extern enum Resampler ResamplerDefault;
+
 /* The number of distinct scale and phase intervals within the filter table. */
 #define BSINC_SCALE_BITS  4
 #define BSINC_SCALE_COUNT (1<<BSINC_SCALE_BITS)
@@ -66,6 +74,11 @@ typedef union InterpState {
     BsincState bsinc;
 } InterpState;
 
+typedef const ALfloat* (*ResamplerFunc)(const InterpState *state,
+    const ALfloat *restrict src, ALsizei frac, ALint increment,
+    ALfloat *restrict dst, ALsizei dstlen
+);
+
 
 typedef union aluVector {
     alignas(16) ALfloat v[4];
@@ -172,6 +185,7 @@ struct ALvoiceProps {
     ALfloat Orientation[2][3];
     ALboolean HeadRelative;
     enum DistanceModel DistanceModel;
+    enum Resampler Resampler;
     ALboolean DirectChannels;
 
     ALboolean DryGainHFAuto;
@@ -245,6 +259,8 @@ typedef struct ALvoice {
     /** Current target parameters used for mixing. */
     ALint Step;
 
+    ResamplerFunc Resampler;
+
     ALuint Flags;
 
     ALuint Offset; /* Number of output samples mixed since starting. */
@@ -272,11 +288,6 @@ typedef struct ALvoice {
 void DeinitVoice(ALvoice *voice);
 
 
-typedef const ALfloat* (*ResamplerFunc)(const InterpState *state,
-    const ALfloat *restrict src, ALsizei frac, ALint increment,
-    ALfloat *restrict dst, ALsizei dstlen
-);
-
 typedef void (*MixerFunc)(const ALfloat *data, ALsizei OutChans,
                           ALfloat (*restrict OutBuffer)[BUFFERSIZE], ALfloat *CurrentGains,
                           const ALfloat *TargetGains, ALsizei Counter, ALsizei OutPos,
@@ -364,21 +375,12 @@ inline ALfloat resample_fir4(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat v
 }
 
 
-enum Resampler {
-    PointResampler,
-    LinearResampler,
-    FIR4Resampler,
-    BSincResampler,
-};
-extern enum Resampler ResamplerDefault;
-
 enum HrtfRequestMode {
     Hrtf_Default = 0,
     Hrtf_Enable = 1,
     Hrtf_Disable = 2,
 };
 
-
 void aluInitMixer(void);
 
 MixerFunc SelectMixer(void);

OpenAL32/alSource.c

@@ -2946,6 +2946,7 @@ static void InitSourceParams(ALsource *Source, ALsizei num_sends)
     Source->HeadRelative = AL_FALSE;
     Source->Looping = AL_FALSE;
     Source->DistanceModel = DefaultDistanceModel;
+    Source->Resampler = ResamplerDefault;
     Source->DirectChannels = AL_FALSE;
 
     Source->StereoPan[0] = DEG2RAD( 30.0f);
@@ -3054,6 +3055,7 @@ static void UpdateSourceProps(ALsource *source, ALvoice *voice, ALsizei num_send
     }
     props->HeadRelative = source->HeadRelative;
     props->DistanceModel = source->DistanceModel;
+    props->Resampler = source->Resampler;
     props->DirectChannels = source->DirectChannels;
 
     props->DryGainHFAuto = source->DryGainHFAuto;