328 lines
11 KiB
C++
328 lines
11 KiB
C++
// vst3_host_bridge.cpp — VST3 GUI bridge (T9, spec vsti_gui)
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//
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// DLL export C API để attach VST3 editor vào HWND cha (cửa sổ nổi `vst_gui_*`
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// từ T8). Flow chuẩn hosting: Module::create(path) → PlugProvider →
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// getController → createView(kEditor) → getSize → attached(hwnd,
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// kPlatformTypeHWND). Đóng: view->removed() + release (IPtr).
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//
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// QUYẾT ĐỊNH (T9): VST3 SDK THUẦN (không JUCE) — nhẹ, license BSD-3 sạch;
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// T10 VST2 dùng vestige.h clean-room riêng; T12 native audio loop cũng SDK
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// thuần. Nâng cấp nếu cần: gộp engine bằng JUCE khi có yêu cầu rõ ràng.
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//
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// T11 sẽ mở rộng ComponentHandler::performEdit → đẩy lên JS (vst_param_changed);
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// hiện tại no-op để plugin không crash khi user chỉnh param trong editor.
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#define NOMINMAX
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <cstdint>
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#include <cstdio>
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#include <map>
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#include <memory>
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#include <mutex>
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#include <string>
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#include "public.sdk/source/vst/hosting/module.h"
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#include "public.sdk/source/vst/hosting/plugprovider.h"
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#include "public.sdk/source/common/commonstringconvert.h"
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#include "pluginterfaces/base/funknown.h"
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#include "pluginterfaces/gui/iplugview.h"
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#include "pluginterfaces/vst/ivstaudioprocessor.h"
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#include "pluginterfaces/vst/ivstcomponent.h"
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#include "pluginterfaces/vst/ivsteditcontroller.h"
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using namespace Steinberg;
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using namespace Steinberg::Vst;
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namespace {
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// Callback param: plugin đổi param trong editor → đẩy lên host (T11).
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// handle = instance handle; paramId = ParamID; valueNormalized 0..1.
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typedef void (__cdecl* SF_ParamChangedCallback)(int32 handle, int32 paramId,
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double valueNormalized, void* userdata);
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// ComponentHandler tối thiểu — T11: performEdit → callback param sync.
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class ComponentHandler : public IComponentHandler
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{
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public:
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ComponentHandler () = default;
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tresult PLUGIN_API queryInterface (const TUID _iid, void** obj) override
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{
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if (FUnknownPrivate::iidEqual (_iid, IComponentHandler::iid) ||
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FUnknownPrivate::iidEqual (_iid, FUnknown::iid))
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{
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*obj = this;
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addRef ();
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return kResultOk;
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}
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*obj = nullptr;
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return kNoInterface;
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}
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uint32 PLUGIN_API addRef () override { return 1; }
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uint32 PLUGIN_API release () override { return 1; }
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tresult PLUGIN_API beginEdit (ParamID /*id*/) override { return kResultOk; }
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tresult PLUGIN_API performEdit (ParamID id, ParamValue valueNormalized) override
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{
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if (cb)
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cb (handle, static_cast<int32> (id), static_cast<double> (valueNormalized), userdata);
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return kResultOk;
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}
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tresult PLUGIN_API endEdit (ParamID /*id*/) override { return kResultOk; }
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tresult PLUGIN_API restartComponent (int32 /*flags*/) override { return kResultOk; }
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void setCallback (int32 h, SF_ParamChangedCallback c, void* u)
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{
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handle = h;
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cb = c;
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userdata = u;
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}
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private:
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int32 handle = 0;
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SF_ParamChangedCallback cb = nullptr;
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void* userdata = nullptr;
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};
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struct Instance
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{
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VST3::Hosting::Module::Ptr module;
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IPtr<PlugProvider> plugProvider;
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IPtr<IEditController> controller;
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IPtr<IPlugView> view;
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ComponentHandler handler;
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};
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std::mutex g_mutex;
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std::map<int32, std::unique_ptr<Instance>> g_instances;
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int32 g_next_handle = 1;
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void set_err (char* err, int32 err_cap, const char* msg)
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{
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if (err && err_cap > 0)
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{
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std::snprintf (err, static_cast<size_t> (err_cap), "%s", msg);
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}
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}
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} // namespace
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extern "C" {
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// Attach VST3 editor vào parent_hwnd. module_path_utf8: đường dẫn tới .vst3
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// (UTF-8). plugin_name: tên class VST3 (ClassInfo::name — khớp plugin_id JS).
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// Trả handle (>= 1) hoặc 0 + err. out_w/out_h: kích thước ưa thích của editor.
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__declspec (dllexport) int32 SF_VST3_Attach (const char* module_path_utf8,
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const char* plugin_name,
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HWND parent_hwnd,
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int32* out_w,
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int32* out_h,
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char* err,
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int32 err_cap)
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{
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std::lock_guard<std::mutex> lock (g_mutex);
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if (!module_path_utf8 || !plugin_name || !parent_hwnd)
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{
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set_err (err, err_cap, "null arg");
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return 0;
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}
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auto inst = std::make_unique<Instance> ();
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std::string loadError;
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inst->module = VST3::Hosting::Module::create (module_path_utf8, loadError);
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if (!inst->module)
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{
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set_err (err, err_cap, "cannot load VST3 module");
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return 0;
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}
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VST3::Hosting::ClassInfo classInfo;
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bool found = false;
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auto factory = inst->module->getFactory ();
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for (auto& ci : factory.classInfos ())
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{
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if (ci.category () == kVstAudioEffectClass && ci.name () == plugin_name)
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{
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classInfo = ci;
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found = true;
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break;
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}
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}
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if (!found)
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{
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set_err (err, err_cap, "no VST3 audio effect class with that name");
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return 0;
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}
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inst->plugProvider = IPtr<PlugProvider> (new PlugProvider (factory, classInfo, true));
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if (!inst->plugProvider->initialize ())
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{
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set_err (err, err_cap, "plugin initialize failed");
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return 0;
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}
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IEditController* rawController = inst->plugProvider->getController (); // +1 ref
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if (!rawController)
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{
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set_err (err, err_cap, "plugin has no edit controller");
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return 0;
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}
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inst->controller = IPtr<IEditController> (rawController); // nhận +1
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inst->controller->setComponentHandler (&inst->handler);
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inst->view = inst->controller->createView (ViewType::kEditor);
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if (!inst->view)
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{
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set_err (err, err_cap, "plugin has no editor view");
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return 0;
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}
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ViewRect r {};
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if (inst->view->getSize (&r) == kResultTrue)
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{
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if (out_w)
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*out_w = r.getWidth ();
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if (out_h)
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*out_h = r.getHeight ();
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}
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if (inst->view->attached ((void*) parent_hwnd, kPlatformTypeHWND) != kResultTrue)
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{
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set_err (err, err_cap, "view attach failed");
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return 0;
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}
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int32 handle = g_next_handle++;
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g_instances[handle] = std::move (inst);
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return handle;
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}
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// Đóng editor: removed() + release (IPtr tự release khi xóa Instance).
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__declspec (dllexport) int32 SF_VST3_Close (int32 handle, char* err, int32 err_cap)
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{
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std::lock_guard<std::mutex> lock (g_mutex);
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auto it = g_instances.find (handle);
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if (it == g_instances.end ())
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{
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set_err (err, err_cap, "bad handle");
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return -1;
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}
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if (it->second->view)
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{
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it->second->view->removed ();
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it->second->view = nullptr;
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}
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g_instances.erase (it);
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return 0;
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}
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// Kích thước ưa thích hiện tại của editor.
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__declspec (dllexport) int32 SF_VST3_GetSize (int32 handle, int32* out_w, int32* out_h)
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{
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std::lock_guard<std::mutex> lock (g_mutex);
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auto it = g_instances.find (handle);
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if (it == g_instances.end ())
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return -1;
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ViewRect r {};
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if (it->second->view && it->second->view->getSize (&r) == kResultTrue)
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{
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if (out_w)
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*out_w = r.getWidth ();
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if (out_h)
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*out_h = r.getHeight ();
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return 0;
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}
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return -2;
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}
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// Báo view: parent HWND đã được resize (w,h) — plugin cập nhật nội dung.
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__declspec (dllexport) int32 SF_VST3_Resize (int32 handle, int32 w, int32 h)
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{
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std::lock_guard<std::mutex> lock (g_mutex);
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auto it = g_instances.find (handle);
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if (it == g_instances.end ())
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return -1;
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if (it->second->view)
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{
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ViewRect r = {};
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r.right = w;
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r.bottom = h;
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if (it->second->view->onSize (&r) == kResultTrue)
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return 0;
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}
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return -2;
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}
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// Đăng ký callback param (T11): plugin đổi param trong editor → cb(handle,
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// paramId, valueNormalized, userdata). userdata là con trỏ do host giữ.
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__declspec (dllexport) int32 SF_VST3_SetParamCallback (int32 handle,
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SF_ParamChangedCallback cb,
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void* userdata)
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{
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std::lock_guard<std::mutex> lock (g_mutex);
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auto it = g_instances.find (handle);
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if (it == g_instances.end ())
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return -1;
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it->second->handler.setCallback (handle, cb, userdata);
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return 0;
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}
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// JS automation → setParamNormalized (T11).
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__declspec (dllexport) int32 SF_VST3_SetParam (int32 handle, int32 paramId, double valueNormalized)
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{
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std::lock_guard<std::mutex> lock (g_mutex);
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auto it = g_instances.find (handle);
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if (it == g_instances.end ())
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return -1;
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if (!it->second->controller)
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return -2;
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it->second->controller->setParamNormalized (static_cast<ParamID> (paramId),
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static_cast<ParamValue> (valueNormalized));
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return 0;
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}
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// Số tham số plugin (để JS dựng UI param list).
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__declspec (dllexport) int32 SF_VST3_GetParamCount (int32 handle)
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{
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std::lock_guard<std::mutex> lock (g_mutex);
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auto it = g_instances.find (handle);
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if (it == g_instances.end ())
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return -1;
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if (!it->second->controller)
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return -2;
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return static_cast<int32> (it->second->controller->getParameterCount ());
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}
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// Thông tin param thứ index (0-based): id + tên (title) + giá trị normalized.
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// Trả 0 nếu OK; -1 bad handle; -2 no controller; -3 index ngoài phạm vi.
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__declspec (dllexport) int32 SF_VST3_GetParamInfo (int32 handle, int32 index,
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int32* out_id, char* out_title,
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int32 title_cap, double* out_value)
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{
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std::lock_guard<std::mutex> lock (g_mutex);
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auto it = g_instances.find (handle);
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if (it == g_instances.end ())
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return -1;
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IEditController* ctrl = it->second->controller;
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if (!ctrl)
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return -2;
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if (index < 0 || static_cast<uint32> (index) >= ctrl->getParameterCount ())
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return -3;
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ParameterInfo info = {};
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if (ctrl->getParameterInfo (static_cast<int32> (index), info) != kResultTrue)
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return -3;
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if (out_id)
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*out_id = static_cast<int32> (info.id);
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if (out_title && title_cap > 0)
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{
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std::string titleUtf8 = StringConvert::convert (std::u16string (info.title));
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std::strncpy (out_title, titleUtf8.c_str (), static_cast<size_t> (title_cap - 1));
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out_title[title_cap - 1] = '\0';
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}
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if (out_value)
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*out_value = static_cast<double> (ctrl->getParamNormalized (info.id));
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return 0;
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}
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} // extern "C"
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