From 1c540181116a875f708890bc9c380b71cd1fd6ba Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Sat, 11 Apr 2009 17:04:55 -0700
Subject: [PATCH] Move the WetBuffer into the effect slot object This should
 make it easier to support multiple slots

---
 Alc/ALu.c                          | 12 ++++++++----
 OpenAL32/Include/alAuxEffectSlot.h |  2 ++
 OpenAL32/Include/alu.h             |  2 ++
 OpenAL32/alAuxEffectSlot.c         |  4 +++-
 4 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/Alc/ALu.c b/Alc/ALu.c
index eee4fa9a..5f98d2f9 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -92,7 +92,6 @@ typedef long long ALint64;
 #define __min min
 #endif
 
-#define BUFFERSIZE 24000
 #define FRACTIONBITS 14
 #define FRACTIONMASK ((1L<<FRACTIONBITS)-1)
 #define MAX_PITCH 65536
@@ -894,7 +893,8 @@ static __inline ALshort lerp(ALshort val1, ALshort val2, ALint frac)
 ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum format)
 {
     static float DryBuffer[BUFFERSIZE][OUTPUTCHANNELS];
-    static float WetBuffer[BUFFERSIZE];
+    static float DummyBuffer[BUFFERSIZE];
+    ALfloat *WetBuffer = NULL;
     ALfloat (*Matrix)[OUTPUTCHANNELS] = ALContext->ChannelMatrix;
     ALfloat newDrySend[OUTPUTCHANNELS] = { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f };
     ALfloat newWetSend = 0.0f;
@@ -963,7 +963,6 @@ ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum forma
         rampLength = max(rampLength, SamplesToDo);
 
         //Clear mixing buffer
-        memset(WetBuffer, 0, SamplesToDo*sizeof(ALfloat));
         memset(DryBuffer, 0, SamplesToDo*OUTPUTCHANNELS*sizeof(ALfloat));
 
         //Actual mixing loop
@@ -997,6 +996,9 @@ ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum forma
                     //Get source info
                     DryFilter = &ALSource->iirFilter;
                     WetFilter = &ALSource->Send[0].iirFilter;
+                    WetBuffer = (ALSource->Send[0].Slot ?
+                                 ALSource->Send[0].Slot->WetBuffer :
+                                 DummyBuffer);
                     DrySend = ALSource->DryGains;
                     WetSend = &ALSource->WetGain;
 
@@ -1339,8 +1341,10 @@ ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum forma
         while(ALEffectSlot)
         {
             if(ALEffectSlot->effect.type == AL_EFFECT_REVERB)
-                VerbProcess(ALEffectSlot->ReverbState, SamplesToDo, WetBuffer, DryBuffer);
+                VerbProcess(ALEffectSlot->ReverbState, SamplesToDo, ALEffectSlot->WetBuffer, DryBuffer);
 
+            for(i = 0;i < SamplesToDo;i++)
+                ALEffectSlot->WetBuffer[i] = 0.0f;
             ALEffectSlot = ALEffectSlot->next;
         }
 
diff --git a/OpenAL32/Include/alAuxEffectSlot.h b/OpenAL32/Include/alAuxEffectSlot.h
index cc5b9d34..a818bb47 100644
--- a/OpenAL32/Include/alAuxEffectSlot.h
+++ b/OpenAL32/Include/alAuxEffectSlot.h
@@ -25,6 +25,8 @@ typedef struct ALeffectslot
 
     ALverbState *ReverbState;
 
+    ALfloat WetBuffer[BUFFERSIZE];
+
     ALuint refcount;
 
     // Index to itself
diff --git a/OpenAL32/Include/alu.h b/OpenAL32/Include/alu.h
index 913b0a51..7c6e95b7 100644
--- a/OpenAL32/Include/alu.h
+++ b/OpenAL32/Include/alu.h
@@ -22,6 +22,8 @@ enum {
     OUTPUTCHANNELS
 };
 
+#define BUFFERSIZE 24000
+
 extern ALboolean DuplicateStereo;
 
 __inline ALuint aluBytesFromFormat(ALenum format);
diff --git a/OpenAL32/alAuxEffectSlot.c b/OpenAL32/alAuxEffectSlot.c
index dd524f02..65db34b3 100644
--- a/OpenAL32/alAuxEffectSlot.c
+++ b/OpenAL32/alAuxEffectSlot.c
@@ -38,7 +38,7 @@ static ALvoid InitializeEffect(ALCcontext *Context, ALeffectslot *ALEffectSlot,
 ALvoid AL_APIENTRY alGenAuxiliaryEffectSlots(ALsizei n, ALuint *effectslots)
 {
     ALCcontext *Context;
-    ALsizei i;
+    ALsizei i, j;
 
     Context = alcGetCurrentContext();
     if(!Context)
@@ -74,6 +74,8 @@ ALvoid AL_APIENTRY alGenAuxiliaryEffectSlots(ALsizei n, ALuint *effectslots)
 
                     (*list)->Gain = 1.0;
                     (*list)->AuxSendAuto = AL_TRUE;
+                    for(j = 0;j < BUFFERSIZE;j++)
+                        (*list)->WetBuffer[j] = 0.0f;
                     (*list)->refcount = 0;
 
                     effectslots[i] = (ALuint)ALTHUNK_ADDENTRY(*list);
-- 
2.11.4.GIT