feat(vst): stand up VST3 instrument spike (S1) — skeleton, IPlugView↔LICE editor, REAPER bridge read

Vendor Steinberg VST3 SDK (v3.7.9_build_61); add reasampler_vst.vst3 as a second, additive build artifact with pure editor-geometry + bridge-marshal helpers under CTest.
2026-07-26 15:29:54 -04:00
parent 5595ba42f9
commit 3c2a7c45b2
17 changed files with 1256 additions and 0 deletions
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+// reasampler_processor.h — the VST3 SingleComponentEffect skeleton (Phase S1). THIN
+// shell: an instrument that declares an event-input bus + a stereo audio-output bus,
+// sets up processing, and runs an empty (silent) process. Nothing plays yet — S4 wires
+// the pure sampler core into process(); S1 only proves REAPER hosts it.
+//
+// SingleComponentEffect is the SDK's combined processor+controller base — sanctioned
+// for a non-distributable, REAPER-only plugin under D5/D6 (verified: SDK class
+// reference). It gives us addAudioOutput/addEventInput and the IEditController seat, so
+// createView() can hand the host our IPlugView LICE editor.
+
+#pragma once
+
+#include "public.sdk/source/vst/vstsinglecomponenteffect.h"
+
+#include "reaper_bridge.h"
+
+namespace reasampler::vst {
+
+class ReaSamplerProcessor : public Steinberg::Vst::SingleComponentEffect {
+public:
+    ReaSamplerProcessor() = default;
+
+    // The factory create function (registered in vst_entry.cpp).
+    static Steinberg::FUnknown* createInstance(void* /*context*/);
+
+    //--- from IComponent / IPluginBase -------------------------------------
+    // Connects the REAPER bridge (context is REAPER's IHostApplication) and declares
+    // the instrument bus topology.
+    Steinberg::tresult PLUGIN_API initialize(Steinberg::FUnknown* context) override;
+    Steinberg::tresult PLUGIN_API terminate() override;
+    Steinberg::tresult PLUGIN_API setActive(Steinberg::TBool state) override;
+
+    //--- from IAudioProcessor ----------------------------------------------
+    Steinberg::tresult PLUGIN_API setupProcessing(
+        Steinberg::Vst::ProcessSetup& setup) override;
+    // Empty in the spike: emits silence (S4 fills it).
+    Steinberg::tresult PLUGIN_API process(
+        Steinberg::Vst::ProcessData& data) override;
+
+    //--- from IEditController -----------------------------------------------
+    // Hands the host our LICE IPlugView editor.
+    Steinberg::IPlugView* PLUGIN_API createView(Steinberg::FIDString name) override;
+
+private:
+    ReaperBridge bridge_;
+};
+
+}  // namespace reasampler::vst