From 803bc041c7e228e2b7c88afd1121550e51db3f82 Mon Sep 17 00:00:00 2001
From: Max Roncace <me@caseif.net>
Date: Fri, 20 Feb 2026 05:53:27 -0500
Subject: Implement Z2AudioCS (#3103)

---
 src/Z2AudioCS/SpkMixingBuffer.cpp | 51 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/Z2AudioCS/SpkMixingBuffer.cpp

(limited to 'src/Z2AudioCS/SpkMixingBuffer.cpp')

diff --git a/src/Z2AudioCS/SpkMixingBuffer.cpp b/src/Z2AudioCS/SpkMixingBuffer.cpp
new file mode 100644
index 0000000000..3118f07f94
--- /dev/null
+++ b/src/Z2AudioCS/SpkMixingBuffer.cpp
@@ -0,0 +1,51 @@
+#include "Z2AudioCS/SpkMixingBuffer.h"
+
+#include "Z2AudioCS/SpkSound.h"
+#include "JSystem/JAudio2/JASCalc.h"
+#include "JSystem/JAudio2/JASGadget.h"
+#include "JSystem/JAudio2/JASHeapCtrl.h"
+
+SpkMixingBuffer::SpkMixingBuffer(JKRHeap* heap) {
+    JUT_ASSERT(25, heap);
+    for (s32 chan = 0; chan < ARRAY_SIZE(mBuffer); chan++) {
+        mBuffer[chan] = new (heap, 0) s16[cSamplesPerAudioPacket];
+        JUT_ASSERT(29, mBuffer[chan]);
+        bzeroBuffer(chan);
+    }
+}
+
+void SpkMixingBuffer::mix(s32 chan, s16* src, s32 len, f32 weight,
+                          s32 offset) {
+    JUT_ASSERT(61, chan < 4);
+    JUT_ASSERT(62, mBuffer[chan]);
+    JUT_ASSERT(63, src);
+    JUT_ASSERT(64, offset >= 0);
+    JUT_ASSERT(65, (offset+len) <= cSamplesPerAudioPacket);
+
+    for (s32 i = 0; i < len; i++) {
+        s32 sample = mBuffer[chan][i + offset];
+        s16 srcSample = src[i];
+        sample += (s32)(srcSample * weight);
+        mBuffer[chan][i + offset] = JASCalc::clamp<s16, s32>(sample);
+    }
+}
+
+s16* SpkMixingBuffer::getSamples(s32 chan) const {
+    JUT_ASSERT(97, chan < 4);
+    JUT_ASSERT(98, mBuffer[chan]);
+    return mBuffer[chan];
+}
+
+bool SpkMixingBuffer::update(s32 chan) {
+    bzeroBuffer(chan);
+    SpkSoundHolder* sound_holder = JASGlobalInstance<SpkSoundHolder>::getInstance();
+    JUT_ASSERT(121, sound_holder);
+    bool result = sound_holder->update(chan);
+    return result;
+}
+
+void SpkMixingBuffer::bzeroBuffer(s32 chan) {
+    JUT_ASSERT(143, chan < 4);
+    JUT_ASSERT(144, mBuffer[chan]);
+    JASCalc::bzero(mBuffer[chan], cSamplesPerAudioPacket * sizeof(s16));
+}
-- 
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