From c8dfd248185359d86410340741122943524ed10b Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Mon, 17 Feb 2020 04:50:00 -0800
Subject: Add a callback flag for voices

---
 alc/voice.cpp | 14 +++++++++++---
 alc/voice.h   |  9 ++++++---
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/alc/voice.cpp b/alc/voice.cpp
index 1bcde31c..752f13a9 100644
--- a/alc/voice.cpp
+++ b/alc/voice.cpp
@@ -531,7 +531,7 @@ void ALvoice::mix(const State vstate, ALCcontext *Context, const ALuint SamplesT
     ASSUME(SamplesToDo > 0);
 
     /* Get voice info */
-    const bool isstatic{(mFlags&VOICE_IS_STATIC) != 0};
+    const ALuint vtype{mFlags&VOICE_TYPE_MASK};
     ALuint DataPosInt{mPosition.load(std::memory_order_relaxed)};
     ALuint DataPosFrac{mPositionFrac.load(std::memory_order_relaxed)};
     ALbufferlistitem *BufferListItem{mCurrentBuffer.load(std::memory_order_relaxed)};
@@ -649,9 +649,13 @@ void ALvoice::mix(const State vstate, ALCcontext *Context, const ALuint SamplesT
             if UNLIKELY(!BufferListItem)
                 srciter = std::copy(chandata.mPrevSamples.begin()+(MAX_RESAMPLER_PADDING>>1),
                     chandata.mPrevSamples.end(), srciter);
-            else if(isstatic)
+            else if(vtype == VOICE_IS_STATIC)
                 srciter = LoadBufferStatic(BufferListItem, BufferLoopItem, NumChannels,
                     SampleSize, chan, DataPosInt, {srciter, SrcData.end()});
+            else if(vtype == VOICE_IS_CALLBACK)
+            {
+                /* Not Yet Implemented. */
+            }
             else
                 srciter = LoadBufferQueue(BufferListItem, BufferLoopItem, NumChannels,
                     SampleSize, chan, DataPosInt, {srciter, SrcData.end()});
@@ -745,7 +749,7 @@ void ALvoice::mix(const State vstate, ALCcontext *Context, const ALuint SamplesT
         {
             /* Do nothing extra when there's no buffers. */
         }
-        else if(isstatic)
+        else if(vtype == VOICE_IS_STATIC)
         {
             if(BufferLoopItem)
             {
@@ -769,6 +773,10 @@ void ALvoice::mix(const State vstate, ALCcontext *Context, const ALuint SamplesT
                 }
             }
         }
+        else if(vtype == VOICE_IS_CALLBACK)
+        {
+            /* Do nothing extra for callback buffers. */
+        }
         else
         {
             /* Handle streaming source */
diff --git a/alc/voice.h b/alc/voice.h
index 07abe0eb..a5b6fac5 100644
--- a/alc/voice.h
+++ b/alc/voice.h
@@ -181,10 +181,13 @@ struct ALvoiceProps : public ALvoicePropsBase {
 };
 
 #define VOICE_IS_STATIC    (1u<<0)
-#define VOICE_IS_FADING    (1u<<1) /* Fading sources use gain stepping for smooth transitions. */
+#define VOICE_IS_CALLBACK  (1u<<1)
 #define VOICE_IS_AMBISONIC (1u<<2) /* Voice needs HF scaling for ambisonic upsampling. */
-#define VOICE_HAS_HRTF     (1u<<3)
-#define VOICE_HAS_NFC      (1u<<4)
+#define VOICE_IS_FADING    (1u<<3) /* Fading sources use gain stepping for smooth transitions. */
+#define VOICE_HAS_HRTF     (1u<<4)
+#define VOICE_HAS_NFC      (1u<<5)
+
+#define VOICE_TYPE_MASK (VOICE_IS_STATIC | VOICE_IS_CALLBACK)
 
 struct ALvoice {
     enum State {
-- 
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