From 9e5a388dfe2dbd5250f80675426c95a9bdade39c Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Mon, 24 Aug 2020 19:10:16 -0700
Subject: Add a method for effects to create persistent buffer data

---
 alc/effects/base.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'alc/effects')

diff --git a/alc/effects/base.h b/alc/effects/base.h
index 8ed3c6f8..f4ca6df2 100644
--- a/alc/effects/base.h
+++ b/alc/effects/base.h
@@ -8,6 +8,7 @@
 #include "almalloc.h"
 #include "alspan.h"
 #include "atomic.h"
+#include "buffer_formats.h"
 #include "intrusive_ptr.h"
 
 struct ALeffectslot;
@@ -154,6 +155,10 @@ const EffectVtable T##_vtable = {           \
 }
 
 
+struct EffectBufferBase : public al::intrusive_ref<EffectBufferBase> {
+    virtual ~EffectBufferBase() = default;
+};
+
 struct EffectTarget {
     MixParams *Main;
     RealMixParams *RealOut;
@@ -166,6 +171,14 @@ struct EffectState : public al::intrusive_ref<EffectState> {
     virtual ~EffectState() = default;
 
     virtual void deviceUpdate(const ALCdevice *device) = 0;
+    /* Implementations are currently required to copy the buffer data if they
+     * wish to hold on to it, as there's no guarantee the buffer won't be
+     * detached and deleted or altered during a mix.
+     */
+    virtual EffectBufferBase *createBuffer(const ALCdevice */*device*/,
+        const al::byte */*samplesData*/, ALuint /*sampleRate*/, FmtType /*sampleType*/,
+        FmtChannels /*channelType*/, ALuint /*numSamples*/)
+    { return nullptr; }
     virtual void update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target) = 0;
     virtual void process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn, const al::span<FloatBufferLine> samplesOut) = 0;
 };
-- 
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