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.
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// reasampler_editor.cpp — see reasampler_editor.h. The IPlugView<->LICE bridge.
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// Windows-only (D5); the whole file is guarded so a non-Windows build (not a target,
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// but keeps the TU honest) degrades to the CPluginView defaults.
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#include "reasampler_editor.h"
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#include <string>
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#include "editor_geometry.h"
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#include "reaper_bridge.h"
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#ifdef _WIN32
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#include <windowsx.h> // GET_X_LPARAM / GET_Y_LPARAM
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// LICE — the same drawing stack bank_panel uses. On Windows LICE routes through native
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// GDI; no SWELL needed for the child window itself.
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#include "wdltypes.h"
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#include "lice/lice.h"
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#endif
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using namespace Steinberg;
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namespace reasampler::vst {
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namespace {
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#ifdef _WIN32
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constexpr const wchar_t* kChildClassName = L"ReaSamplerVstEditor";
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// Palette — house style, mirrored from bank_panel's dark theme so the instrument reads
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// as the same tool.
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const LICE_pixel kColBackground = LICE_RGBA(28, 28, 30, 255);
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const LICE_pixel kColTitleBg = LICE_RGBA(20, 20, 22, 255);
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const LICE_pixel kColBtnBg = LICE_RGBA(44, 44, 48, 255);
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const LICE_pixel kColBtnHitBg = LICE_RGBA(58, 96, 84, 255);
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const LICE_pixel kColBtnBorder = LICE_RGBA(120, 200, 160, 255);
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const COLORREF kRgbText = RGB(210, 230, 220);
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void drawText(LICE_IBitmap* bmp, const Rect& r, const char* s, COLORREF col) {
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// LICE has no built-in font handle here; use GDI text into the bitmap DC, matching
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// bank_panel's drawCenteredText approach (SetTextColor + DrawText on getDC()).
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HDC dc = bmp->getDC();
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SetBkMode(dc, TRANSPARENT);
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SetTextColor(dc, col);
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RECT gr{r.left, r.top, r.right, r.bottom};
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DrawTextA(dc, s, -1, &gr, DT_LEFT | DT_VCENTER | DT_SINGLELINE | DT_NOPREFIX);
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}
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#endif
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} // namespace
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ReaSamplerEditor::ReaSamplerEditor(ReaperBridge* bridge)
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: CPluginView(nullptr), bridge_(bridge) {
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// Default view size; the host may resize (canResize() == true).
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ViewRect r(0, 0, 420, 260);
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setRect(r);
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}
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ReaSamplerEditor::~ReaSamplerEditor() {
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#ifdef _WIN32
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// Defensive teardown: the host normally calls removed() (which destroys the child)
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// before releasing us, but if we're destroyed while still attached, don't leak the
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// window — mirror the create in attachedToParent().
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if (childHwnd_) {
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DestroyWindow(childHwnd_);
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childHwnd_ = nullptr;
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}
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#endif
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}
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tresult PLUGIN_API ReaSamplerEditor::isPlatformTypeSupported(FIDString type) {
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#ifdef _WIN32
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if (type && std::string(type) == kPlatformTypeHWND) return kResultTrue;
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#endif
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return kResultFalse;
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}
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tresult PLUGIN_API ReaSamplerEditor::canResize() {
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return kResultTrue;
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}
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#ifdef _WIN32
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void ReaSamplerEditor::attachedToParent() {
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// systemWindow is the parent HWND the host created (CPluginView::attached set it
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// from the void* parent when the type is HWND).
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HWND parent = static_cast<HWND>(systemWindow);
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if (!parent) return;
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HINSTANCE hInst = reinterpret_cast<HINSTANCE>(
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GetWindowLongPtr(parent, GWLP_HINSTANCE));
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if (!hInst) hInst = GetModuleHandle(nullptr);
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// Register the child window class once per module.
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static bool classRegistered = false;
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if (!classRegistered) {
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WNDCLASSW wc{};
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wc.lpfnWndProc = &ReaSamplerEditor::wndProc;
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wc.hInstance = hInst;
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wc.lpszClassName = kChildClassName;
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wc.hCursor = LoadCursor(nullptr, IDC_ARROW);
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wc.style = CS_HREDRAW | CS_VREDRAW;
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RegisterClassW(&wc);
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classRegistered = true;
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}
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const ViewRect& r = getRect();
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childHwnd_ = CreateWindowExW(
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0, kChildClassName, L"", WS_CHILD | WS_VISIBLE, 0, 0, r.getWidth(),
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r.getHeight(), parent, nullptr, hInst, nullptr);
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if (childHwnd_) {
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// Stash `this` so wndProc can route messages back to the instance.
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SetWindowLongPtr(childHwnd_, GWLP_USERDATA,
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reinterpret_cast<LONG_PTR>(this));
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}
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}
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void ReaSamplerEditor::removedFromParent() {
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if (childHwnd_) {
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DestroyWindow(childHwnd_);
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childHwnd_ = nullptr;
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}
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}
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tresult PLUGIN_API ReaSamplerEditor::onSize(ViewRect* newSize) {
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// Let CPluginView latch the new rect, then resize the child window to match so the
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// LICE surface fills the host-provided seat.
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tresult res = CPluginView::onSize(newSize);
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if (childHwnd_ && newSize) {
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MoveWindow(childHwnd_, 0, 0, newSize->getWidth(), newSize->getHeight(), TRUE);
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}
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return res;
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}
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void ReaSamplerEditor::paint(HDC hdc) {
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RECT cr{};
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GetClientRect(childHwnd_, &cr);
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const int w = cr.right - cr.left;
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const int h = cr.bottom - cr.top;
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if (w <= 0 || h <= 0) return;
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// Same double-buffered LICE pattern as bank_panel::paintPanel: draw into a
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// LICE_SysBitmap, then BitBlt to the window DC.
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LICE_SysBitmap bmp(w, h);
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LICE_Clear(&bmp, kColBackground);
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const EditorLayout layout = layoutEditor(w, h);
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// Title band.
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LICE_FillRect(&bmp, layout.titleBar.left, layout.titleBar.top,
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layout.titleBar.width(), layout.titleBar.height(), kColTitleBg, 1.0f,
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0);
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// Read a known live-state value over the bridge to prove the read spike. Show the
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// raw ext-state presence (never the full blob) so the title reflects live project
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// state without dumping JSON into the UI.
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std::string title = "ReaSampler Instrument";
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if (bridge_ && bridge_->isConnected()) {
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auto banks = bridge_->readReasamplerExtState("banks");
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title += banks ? " [bank: linked]" : " [bank: none]";
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} else {
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title += " [host: no bridge]";
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}
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Rect titleText{layout.titleBar.left + 8, layout.titleBar.top,
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layout.titleBar.right - 8, layout.titleBar.bottom};
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drawText(&bmp, titleText, title.c_str(), kRgbText);
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// The clickable button — fill reflects the last hit-test (the routing proof).
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LICE_FillRect(&bmp, layout.button.left, layout.button.top, layout.button.width(),
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layout.button.height(), buttonHit_ ? kColBtnHitBg : kColBtnBg, 1.0f,
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0);
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LICE_DrawRect(&bmp, layout.button.left, layout.button.top, layout.button.width(),
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layout.button.height(), kColBtnBorder, 1.0f, 0);
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Rect btnText{layout.button.left + 8, layout.button.top, layout.button.right,
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layout.button.bottom};
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drawText(&bmp, btnText, buttonHit_ ? "clicked" : "click me", kRgbText);
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BitBlt(hdc, 0, 0, w, h, bmp.getDC(), 0, 0, SRCCOPY);
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}
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void ReaSamplerEditor::onClick(int x, int y) {
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RECT cr{};
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GetClientRect(childHwnd_, &cr);
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const EditorLayout layout = layoutEditor(cr.right - cr.left, cr.bottom - cr.top);
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if (hitTest(layout, x, y) == HitTarget::kButton) {
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buttonHit_ = !buttonHit_;
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InvalidateRect(childHwnd_, nullptr, FALSE);
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}
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}
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LRESULT CALLBACK ReaSamplerEditor::wndProc(HWND hwnd, UINT msg, WPARAM wParam,
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LPARAM lParam) {
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auto* self = reinterpret_cast<ReaSamplerEditor*>(
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GetWindowLongPtr(hwnd, GWLP_USERDATA));
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switch (msg) {
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case WM_PAINT: {
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PAINTSTRUCT ps{};
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HDC hdc = BeginPaint(hwnd, &ps);
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if (self) self->paint(hdc);
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EndPaint(hwnd, &ps);
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return 0;
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}
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case WM_LBUTTONDOWN:
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if (self) self->onClick(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
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return 0;
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case WM_ERASEBKGND:
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return 1; // we fully repaint in WM_PAINT; skip the flicker-inducing erase
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default:
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return DefWindowProcW(hwnd, msg, wParam, lParam);
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}
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}
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#else // non-Windows: not a build target (D5), but keep the TU compilable.
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void ReaSamplerEditor::attachedToParent() {}
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void ReaSamplerEditor::removedFromParent() {}
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tresult PLUGIN_API ReaSamplerEditor::onSize(ViewRect* newSize) {
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return CPluginView::onSize(newSize);
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}
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#endif // _WIN32
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} // namespace reasampler::vst
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