Move the direct and send params into separate different types

Alc/ALu.c

@@ -320,7 +320,7 @@ ALvoid CalcNonAttnSourceParams(ALsource *ALSource, const ALCcontext *ALContext)
             Slot = Device->DefaultSlot;
         if(Slot && Slot->effect.type == AL_EFFECT_NULL)
             Slot = NULL;
-        ALSource->Params.Send[i].Slot = Slot;
+        ALSource->Params.Slot[i] = Slot;
         ALSource->Params.Send[i].Gain = WetGain[i] * ListenerGain;
     }
 
@@ -458,7 +458,7 @@ ALvoid CalcSourceParams(ALsource *ALSource, const ALCcontext *ALContext)
             RoomAirAbsorption[i] = AIRABSORBGAINHF;
         }
 
-        ALSource->Params.Send[i].Slot = Slot;
+        ALSource->Params.Slot[i] = Slot;
     }
 
     /* Transform source to listener space (convert to head relative) */

Alc/mixer.c

@@ -336,7 +336,7 @@ static void MixSend_##sampler(ALsource *Source, ALuint sendidx,               \
                                                                               \
     increment = Source->Params.Step;                                          \
                                                                               \
-    Slot = Source->Params.Send[sendidx].Slot;                                 \
+    Slot = Source->Params.Slot[sendidx];                                      \
     WetBuffer = Slot->WetBuffer;                                              \
     WetClickRemoval = Slot->ClickRemoval;                                     \
     WetPendingClicks = Slot->PendingClicks;                                   \
@@ -719,7 +719,7 @@ ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo)
                               OutPos, SamplesToDo, BufferSize);
         for(i = 0;i < Device->NumAuxSends;i++)
         {
-            if(!Source->Params.Send[i].Slot)
+            if(!Source->Params.Slot[i])
                 continue;
             Source->Params.WetMix(Source, i, SrcData, DataPosFrac,
                                   OutPos, SamplesToDo, BufferSize);

OpenAL32/Include/alSource.h

@@ -28,6 +28,14 @@ typedef struct ALbufferlistitem
     struct ALbufferlistitem *prev;
 } ALbufferlistitem;
 
+typedef struct HrtfState {
+    ALboolean Moving;
+    ALuint Counter;
+    ALfloat History[MAXCHANNELS][SRC_HISTORY_LENGTH];
+    ALfloat Values[MAXCHANNELS][HRIR_LENGTH][2];
+    ALuint Offset;
+} HrtfState;
+
 typedef struct HrtfParams {
     ALfloat Gain;
     ALfloat Dir[3];
@@ -37,13 +45,27 @@ typedef struct HrtfParams {
     ALint DelayStep[2];
 } HrtfParams;
 
-typedef struct HrtfState {
-    ALboolean Moving;
-    ALuint Counter;
-    ALfloat History[MAXCHANNELS][SRC_HISTORY_LENGTH];
-    ALfloat Values[MAXCHANNELS][HRIR_LENGTH][2];
-    ALuint Offset;
-} HrtfState;
+typedef struct DirectParams {
+    /* A mixing matrix. First subscript is the channel number of the input data
+     * (regardless of channel configuration) and the second is the channel
+     * target (eg. FRONT_LEFT). */
+    ALfloat Gains[MAXCHANNELS][MAXCHANNELS];
+
+    /* A low-pass filter, using 2 chained one-pole filters. */
+    FILTER iirFilter;
+    ALfloat history[MAXCHANNELS*2];
+} DirectParams;
+
+typedef struct SendParams {
+    /* Gain control, which applies to all input channels to a single (mono)
+     * output buffer. */
+    ALfloat Gain;
+
+    /* A low-pass filter, using a one-pole filter. */
+    FILTER iirFilter;
+    ALfloat history[MAXCHANNELS];
+} SendParams;
+
 
 typedef struct ALsource
 {
@@ -130,22 +152,10 @@ typedef struct ALsource
 
         HrtfParams Hrtf;
 
-        struct {
-            /* A mixing matrix. First subscript is the channel number of the
-             * input data (regardless of channel configuration) and the second
-             * is the channel target (eg. FRONT_LEFT). */
-            ALfloat Gains[MAXCHANNELS][MAXCHANNELS];
+        DirectParams Direct;
 
-            FILTER iirFilter;
-            ALfloat history[MAXCHANNELS*2];
-        } Direct;
-
-        struct {
-            struct ALeffectslot *Slot;
-            ALfloat Gain;
-            FILTER iirFilter;
-            ALfloat history[MAXCHANNELS];
-        } Send[MAX_SENDS];
+        struct ALeffectslot *Slot[MAX_SENDS];
+        SendParams Send[MAX_SENDS];
     } Params;
     /** Source needs to update its mixing parameters. */
     volatile ALenum NeedsUpdate;