T11: IPC param sync 2 chieu native<->JS (setParamNormalized/setParameter, vst_param_changed event, guard chong loop)

native_host/tests/fake_vst2.cpp

@@ -13,9 +13,33 @@ struct FakeState
 {
     float phase = 0.0f;
     int32 sampleRate = 44100;
+    float gain = 0.5f; // param 0 — "Gain" (0..1)
 };
 
 FakeState g_state;
+void* g_audioMaster = nullptr;
+
+void VSTCALLBACK fakeSetParameter (AEffect* effect, int32 index, float value)
+{
+    if (index == 0)
+    {
+        g_state.gain = value;
+        // Báo host: param đổi từ editor/plugin (T11) — chống loop host-side.
+        if (g_audioMaster)
+        {
+            typedef VstIntPtr (VSTCALLBACK* AMFn) (AEffect*, int32, int32, VstIntPtr, void*, float);
+            reinterpret_cast<AMFn> (g_audioMaster) (effect, audioMasterAutomate, index, 0, nullptr,
+                                                    value);
+        }
+    }
+}
+
+float VSTCALLBACK fakeGetParameter (AEffect*, int32 index)
+{
+    if (index == 0)
+        return g_state.gain;
+    return 0.0f;
+}
 
 int32 VSTCALLBACK fakeDispatcher (AEffect* effect, int32 opcode, int32 index,
                                   VstIntPtr value, void* ptr, float opt)
@@ -91,15 +115,18 @@ void VSTCALLBACK fakeProcessReplacing (AEffect*, float** inputs, float** outputs
 
 AEffect g_effect;
 
-AEffect* VSTCALLBACK createInstance (void*)
+AEffect* VSTCALLBACK createInstance (void* audioMaster)
 {
+    g_audioMaster = audioMaster;
     std::memset (&g_effect, 0, sizeof (g_effect));
     g_effect.magic = CCONST ('V', 's', 't', 'P');
     g_effect.dispatcher = &fakeDispatcher;
     g_effect.processReplacing = &fakeProcessReplacing;
+    g_effect.setParameter = &fakeSetParameter;
+    g_effect.getParameter = &fakeGetParameter;
     g_effect.numInputs = [] (AEffect*) -> int32 { return 0; };
     g_effect.numOutputs = [] (AEffect*) -> int32 { return 2; };
-    g_effect.numParams = [] (AEffect*) -> int32 { return 0; };
+    g_effect.numParams = [] (AEffect*) -> int32 { return 1; };
     g_effect.numPrograms = [] (AEffect*) -> int32 { return 0; };
     g_effect.flags = [] (AEffect*) -> int32 { return effFlagsCanReplacing | effFlagsIsSynth; };
     g_effect.uniqueID = CCONST ('F', 'k', '2', 'V');
@@ -111,6 +138,5 @@ AEffect* VSTCALLBACK createInstance (void*)
 
 extern "C" __declspec (dllexport) AEffect* VSTPluginMain (void* audioMaster)
 {
-    (void) audioMaster;
     return createInstance (audioMaster);
 }