T13: NativeMixer mirror server pipeline (track gain/pan constant-power + brickwall limiter tanh, wired VST2/VST3 bridge, golden test 0.0001dB)

native_host/VST2AudioEngine.cpp

@@ -24,6 +24,7 @@
 
 #include "vestige.h"
 #include "AudioEngine.h"
+#include "NativeMixer.h"
 
 #include <atomic>
 
@@ -50,6 +51,7 @@ struct Instance
     void* paramCbUserdata = nullptr;
     sonicforge::AudioEngine audio; // T12: native audio loop (SPSC + WASAPI)
     std::atomic<bool> audioRunning {false};
+    sonicforge::NativeMixer mixer; // T13: track gain/pan + master limiter
 };
 
 std::mutex g_mutex;
@@ -163,6 +165,7 @@ bool vst2AudioProcess (const sonicforge::MidiEvent* events, int32 eventCount,
     {
         float* outs[2] = { outL, outR };
         inst->effect->processReplacing (inst->effect, nullptr, outs, frames);
+        inst->mixer.processInPlace (outL, outR, frames); // T13: gain/pan + limiter
         return true;
     }
     return false;
@@ -602,4 +605,26 @@ __declspec (dllexport) int32 SF_VST2_AudioBlocks (int32 handle)
     return it->second->audio.blocksRendered ();
 }
 
+// T13: track gain/pan + master limiter (NativeMixer). Set truoc AudioStart;
+// audio thread doc state nay (khong lock).
+__declspec (dllexport) int32 SF_VST2_SetTrackGainPan (int32 handle, float gainDb, float pan)
+{
+    std::lock_guard<std::mutex> lock (g_mutex);
+    auto it = g_instances.find (handle);
+    if (it == g_instances.end ())
+        return -1;
+    it->second->mixer.setTrack (sonicforge::TrackGainPan::fromDbPan (gainDb, pan));
+    return 0;
+}
+
+__declspec (dllexport) int32 SF_VST2_SetMasterLimiter (int32 handle, int32 active, float thresholdDb)
+{
+    std::lock_guard<std::mutex> lock (g_mutex);
+    auto it = g_instances.find (handle);
+    if (it == g_instances.end ())
+        return -1;
+    it->second->mixer.setLimiter (active != 0, thresholdDb);
+    return 0;
+}
+
 } // extern "C"