2nd Pass Render

src/app/CMakeLists.txt

@@ -27,6 +27,7 @@ add_library(reaper_reasampler MODULE
     ${REASAMPLER_SRC_DIR}/shell/panel/panel_audition.cpp
     ${REASAMPLER_SRC_DIR}/shell/panel/panel_bank_ops.cpp
     ${REASAMPLER_SRC_DIR}/shell/panel/panel_drag.cpp
+    ${REASAMPLER_SRC_DIR}/shell/panel/footer_input.cpp
     ${REASAMPLER_SRC_DIR}/shell/panel/panel_input.cpp
     ${REASAMPLER_SRC_DIR}/shell/panel/panel_layout.cpp
     ${REASAMPLER_SRC_DIR}/shell/panel/panel_render.cpp

src/core/capture/render_settings.cpp

@@ -100,6 +100,10 @@ RenderSettingsChoice renderSettingsFor(SourceMode mode, double /*wetDry*/) {
     return c;
 }
 
+void applySecondPassRenderSettings(const bool secondPass, RenderSettingsChoice& choice) {
+    if (secondPass) { choice.settings |= kSecondPassRender; }
+}
+
 const char* renderSourceLabel(SourceMode mode) {
     switch (mode) {
         // MasterMix and TimeSelection share this label because they ARE the same

src/core/capture/render_settings.h

@@ -20,6 +20,7 @@ inline constexpr int kRenderMasterMix          = 0;      // (&(1|2))==0, no sour
 inline constexpr int kRenderSelItems           = 32;     // &32   selected media items
 inline constexpr int kRenderSelItemsViaMaster  = 64;     // &64   selected media items via master
 inline constexpr int kRenderSelTracksViaMaster = 128;    // &128  selected tracks via master
+inline constexpr int kSecondPassRender         = 2048;   // &2048 2nd Pass Render
 inline constexpr int kRenderRazorEdits         = 4096;   // &4096 render razor edits
 // kRenderPreFaderStems (&8192) is deliberately NOT used — REAPER offline render
 // has no true pre-FX "dry" bit. FX scoping is done by the FX-bypass-around-render
@@ -113,6 +114,9 @@ struct RenderSettingsChoice {
 // SelectedItems -> &32|single-file; RazorArea -> &4096|single-file.
 RenderSettingsChoice renderSettingsFor(SourceMode mode, double wetDry);
 
+// Apply the 2nd Pass Render setting to the RENDER_SETTINGS block
+void applySecondPassRenderSettings(const bool secondPass, RenderSettingsChoice& choice);
+
 // The render source a mode drives, in words. Exists for the offline backend's
 // bounds refusal: the two ways a render can miss its window — a source that
 // derives its own bounds (selected items, razor edits) versus a time-bounded

src/core/capture/tail_control.cpp

@@ -18,6 +18,10 @@ TailMode cycleTailMode(TailMode current) {
     return TailMode::None;  // unreachable for a valid enum; fail to the safe default
 }
 
+bool toggleSecondPass(bool current) {
+    return !current; // wow
+}
+
 double clampManualMs(double manualMs) {
     return std::clamp(manualMs, 0.0, kMaxTailMs);
 }
@@ -77,6 +81,7 @@ std::string serializeTailSetting(const TailSetting& setting) {
         json::Writer w(out);
         w.keyRaw("mode", json::numToStr(modeToInt(setting.mode)));
         w.keyRaw("manualMs", json::numToStr(setting.manualMs));
+        w.keyRaw("secondPass", json::boolToStr(setting.secondPass));
     }  // Writer closes the object here (see bank_model's NRVO note)
     return out;
 }
@@ -87,7 +92,8 @@ std::optional<TailSetting> deserializeTailSetting(const std::string& blob) {
 
     int modeInt = 0;
     double ms = 0.0;
-    bool haveMode = false, haveMs = false;
+    bool secondPass = false;
+    bool haveMode = false, haveMs = false, haveSecondPass = false;
     r.skipWs();
     if (!r.consume('}')) {
         do {
@@ -99,13 +105,16 @@ std::optional<TailSetting> deserializeTailSetting(const std::string& blob) {
             } else if (key == "manualMs") {
                 if (!r.parseDouble(ms)) return std::nullopt;
                 haveMs = true;
+            } else if (key == "secondPass") {
+                if (!r.parseBool(secondPass)) return std::nullopt;
+                haveSecondPass = true;
             } else {
                 if (!r.skipValue()) return std::nullopt;  // forward-compat
             }
         } while (r.consume(','));
         if (!r.consume('}')) return std::nullopt;
     }
-    if (!haveMode || !haveMs) return std::nullopt;  // absent key -> malformed -> default
+    if (!haveMode || !haveMs || !haveSecondPass) return std::nullopt;  // absent key -> malformed -> default
 
     const std::optional<TailMode> mode = modeFromInt(modeInt);
     if (!mode) return std::nullopt;
@@ -113,6 +122,7 @@ std::optional<TailSetting> deserializeTailSetting(const std::string& blob) {
     TailSetting out;
     out.mode = *mode;
     out.manualMs = ms;
+    out.secondPass = secondPass;
     return out;
 }
 

src/core/capture/tail_control.h

@@ -21,14 +21,19 @@ inline constexpr double kManualStepMs = 250.0;
 // The panel's current tail setting: mode + the length used only when Manual.
 // Default None so a capture with no explicit choice stays exact-bounds.
 // `manualMs` is clamped to kMaxTailMs before it ever reaches a CaptureRequest.
+// 2nd-Pass Render optional, off by default
 struct TailSetting {
-    TailMode mode     = TailMode::None;
-    double   manualMs = kDefaultManualTailMs;
+    TailMode mode       = TailMode::None;
+    double   manualMs   = kDefaultManualTailMs;
+    bool     secondPass = false;
 };
 
 // Cycles the tail mode: None -> Auto -> Manual -> None.
 TailMode cycleTailMode(TailMode current);
 
+// Toggles the 2nd-Pass Render
+bool toggleSecondPass(bool current);
+
 // The effective manual length a Manual capture uses: clamped to [0, kMaxTailMs].
 // Exposed so the panel can show the clamped value. Meaningful only for Manual.
 double clampManualMs(double manualMs);

src/core/json/json.cpp

@@ -54,6 +54,12 @@ std::string numToStr(int v) {
     return buf;
 }
 
+std::string boolToStr(bool v) {
+    char buf[6];
+    std::snprintf(buf, sizeof(buf), "%s", v ? "true" : "false");
+    return buf;
+}
+
 void writeStringArray(std::string& out, const std::vector<std::string>& v) {
     out += '[';
     for (std::size_t i = 0; i < v.size(); ++i) {

src/core/json/json.h

@@ -34,6 +34,7 @@ void writeEscaped(std::string& out, const std::string& s);
 std::string numToStr(double v);
 std::string numToStr(std::int64_t v);
 std::string numToStr(int v);
+std::string boolToStr(bool v);
 
 // Flat homogeneous arrays: ["a","b"] / [1,2]. Empty vector -> "[]".
 void writeStringArray(std::string& out, const std::vector<std::string>& v);

src/core/ui/footer_bar.cpp

@@ -2,6 +2,8 @@
 
 #include "core/ui/footer_bar.h"
 
+#include <assert.h>
+
 namespace reasampler::ui {
 
 namespace {
@@ -50,8 +52,18 @@ FooterBarLayout computeFooterBar(const FooterRect& footer, const FooterBarSpec&
     }
 
     // Tail button.
-    if (fitsLeftOf(cursorX, spec.tailWidth, rightBound))
+    if (fitsLeftOf(cursorX, spec.tailWidth, rightBound)) {
         out.tail = FooterBarRect{cursorX, top, spec.tailWidth, boxH};
+        cursorX += spec.tailWidth + spec.gap;
+    }
+    // 2nd Pass Render button.
+    if (fitsLeftOf(cursorX, spec.secondPassWidth, rightBound)) {
+        out.secondPass = FooterBarRect{cursorX,top, spec.secondPassWidth, boxH};
+        // no need to increment the cursor for final element
+    }
+
+    // Package the whole footer bounds into the layout object
+    out.footer = FooterRect{footer};
 
     return out;
 }
@@ -61,7 +73,10 @@ FooterHit hitTestFooterBar(int px, int py, const FooterBarLayout& layout) {
     // count label is a passive readout — never a hit target.
     if (pointIn(px, py, layout.toggle)) return FooterHit::Toggle;
     if (pointIn(px, py, layout.tail))   return FooterHit::Tail;
-    return FooterHit::None;
+    if (pointIn(px, py, layout.secondPass))   return FooterHit::SecondPass;
+    // Finally test if it's within the footer at all
+    if (pointIn(px, py, layout.footer)) return FooterHit::Invalid;
+    return FooterHit::Outside;
 }
 
 bool modeSegmentEnabled(bool isActiveSegment, bool transportRunning, bool routable) {

src/core/ui/footer_bar.h

@@ -25,18 +25,24 @@ using FooterBarRect = Rect;
 // left of the reserved right margin; placement is greedy left-to-right (toggle survives longest,
 // Tail drops first on a very narrow footer).
 struct FooterBarLayout {
+    FooterRect footer;
     FooterBarRect toggle;
     FooterBarRect count;
     FooterBarRect tail;
+    FooterBarRect secondPass;
 
     bool operator==(const FooterBarLayout& o) const {
-        return toggle == o.toggle && count == o.count && tail == o.tail;
+        return  footer == o.footer          &&
+                toggle == o.toggle          &&
+                count == o.count            &&
+                tail == o.tail              &&
+                secondPass == o.secondPass;
     }
 };
 
 // Which footer LEFT-group affordance a point landed on. Prune is hit-tested separately via
 // hitTestPruneButton.
-enum class FooterHit { None, Toggle, Tail };
+enum class FooterHit { Invalid, Toggle, Tail, SecondPass, Outside };
 
 // Layout inputs, in pixels; defaults are the bank_panel footer metrics.
 //   * rightReserve — pixels reserved at the footer's right for the prune button + version
@@ -45,6 +51,7 @@ struct FooterBarSpec {
     int toggleWidth = 132;
     int countWidth = 64;
     int tailWidth = 132;
+    int secondPassWidth = 96;
     int gap = 6;
     int leftPad = 8;
     int verticalInset = 4;

src/shell/capture/capture.cpp

@@ -367,7 +367,7 @@ CaptureResult OfflineRenderBackend::capture(const CaptureRequest& request) {
 
     // SourceMode::Realtime is refused here — that's the realtime backend's job —
     // so the offline path never silently renders the wrong thing.
-    const RenderSettingsChoice choice =
+    RenderSettingsChoice choice =
         renderSettingsFor(request.sourceMode, request.wetDry);
     if (!choice.supported) {
         result.status  = CaptureStatus::UnsupportedMode;
@@ -487,8 +487,12 @@ CaptureResult OfflineRenderBackend::capture(const CaptureRequest& request) {
                       static_cast<double>(tail.tailFlag), true);
     GetSetProjectInfo(proj, "RENDER_TAILMS", tail.tailMs, true);
 
+    // 2nd Pass Render
+    applySecondPassRenderSettings(request.secondPass, choice);
+
     // Source-selection bits for this mode (SDK header ~3041), all wet-only:
     // master mix = 0; tracks = &128; items = &32|single-file; razor = &4096|single-file.
+    // Also is the door to control the 2nd Pass Render setting.
     GetSetProjectInfo(proj, "RENDER_SETTINGS",
                       static_cast<double>(choice.settings), true);
 

src/shell/capture/capture.h

@@ -59,11 +59,13 @@ struct CaptureRequest {
     // bounds, no added silence — the only mode valid for null-test/verify captures.
     // tailMs applies only to Manual (clamped to 8s by the pure mapping); Auto uses
     // the 8s cap + -72 dB trim internally, None ignores it.
-    TailMode tailMode = TailMode::None;
-    double   tailMs   = 0.0;
+    TailMode tailMode   = TailMode::None;
+    double   tailMs     = 0.0;
+    bool     secondPass = false;
 
     // 0 sampleRate => follow project rate.
     int         sampleRate   = 0;
+
     // What the RENDER is asked for (RENDER_CHANNELS / the realtime record mode), not
     // what the capture lands as: a dual-mono render is collapsed to 1 channel after
     // the fact, and the Sample's count comes from the produced file.

src/shell/capture/capture_orchestrator.cpp

@@ -257,6 +257,7 @@ CaptureResult captureAndIndexOne(ReaSamplerSession& session,
     req.wetDry       = 1.0;                 // wet post the FX left enabled by the scope
     req.tailMode     = tail.mode;           // None / Auto / Manual, from the panel toggle
     req.tailMs       = tail.manualMs;       // Manual-only (clamped); ignored for None/Auto
+    req.secondPass   = tail.secondPass;     // Whether 2nd-Pass Render should be performed
     req.sampleRate   = 0;                   // follow project rate
     req.channelCount = 2;
     req.bitDepth     = WavBitDepth::Float32;  // deterministic, no dither

src/shell/capture/render_in_place.cpp

@@ -101,6 +101,7 @@ void RunRenderTrackInPlace(ReaSamplerSession& session) {
     req.wetDry       = 1.0;
     req.tailMode     = tail.mode;
     req.tailMs       = tail.manualMs;
+    req.secondPass   = tail.secondPass;
     req.sampleRate   = 0;                  // follow project rate
     req.channelCount = 2;
     req.bitDepth     = WavBitDepth::Float32;

src/shell/instrument/editor_paint_chrome.cpp

@@ -102,7 +102,7 @@ void ReaSamplerEditor::paintChrome(LICE_IBitmap* bmp, const FaceLayout& fl, bool
 
     // Toolbar: product name + live readout. The beta channel gets no distinct accent; the
     // channel-derived vstPluginName is the only beta-vs-stable signal.
-    std::string title = version::vstPluginName();
+    std::string title = version::vstPluginName() + " v" + version::appVersion();
     if (processor_ && processor_->bridge().isConnected()) {
         // The instance's own loaded state outranks bank availability (the bank is a browser
         // source, not the instrument's identity) — a self-contained instance names its sound

src/shell/panel/footer_input.cpp

@@ -0,0 +1,134 @@
+#include "shell/panel/footer_input.h"
+#include "shell/panel/panel_state.h"
+#include "core/view/view_mode_model.h"
+#include "shell/actions/bank_actions.h"
+#include "shell/persist/session.h"      // ReaSamplerSession — view/tail reads + mutation
+
+#define REAPERAPI_MINIMAL
+#define REAPERAPI_WANT_EnumProjects
+#define REAPERAPI_WANT_MarkProjectDirty
+#define REAPERAPI_WANT_Main_OnCommand
+#include "reaper_plugin_functions.h"
+
+namespace reasampler::panel {
+
+    namespace {
+        // Commits the current tail setting to ext state and marks the active project dirty so the
+        // change travels inside the .rpp on Ctrl+S — closes the gap where toggle/scroll would dirty
+        // the project but never write the new value. No-ops cleanly on an unsaved project.
+        void markTailDirty()
+        {
+            if (g_panel.session) g_panel.session->saveToActiveProject();
+            ReaProject* proj = EnumProjects(-1, nullptr, 0);
+            if (proj) MarkProjectDirty(proj);
+        }
+
+        // click was confirmed on the toggle button;
+        // detect which mode segment was hit (if any)
+        bool clickToggle(int x, int y, ui::FooterBarRect toggleRect)
+        {
+            const int seg = hitTestSegment(x, y, toggleRect, modeCount());
+            if (seg >= 0) {
+                const ViewModeModel& view = g_panel.session->view();
+                const std::vector<Mode>& modes = view.modes().all();
+
+                if (seg < static_cast<int>(modes.size())) {
+                    const std::string& id = modes[static_cast<std::size_t>(seg)].id;
+                    const bool isActive = id == view.activeModeId();
+                    const int cmd = modeActivateCommandId(id);
+                    if (modeSegmentEnabled(isActive, g_panel.modeSwitchBlocked, cmd != 0)) {
+                        if (cmd != 0 && Main_OnCommand) Main_OnCommand(cmd, 0);
+                    }
+                }
+                return true;
+            }
+            return false;
+        }
+
+        // click was confirmed on the Tail button
+        void clickTail()
+        {
+            TailSetting& tail = g_panel.session->tail();
+            tail.mode = cycleTailMode(tail.mode);
+            markTailDirty();
+            invalidatePanel();
+        }
+
+        void clickSecondPass()
+        {
+            TailSetting& tail = g_panel.session->tail();
+            tail.secondPass = capture::toggleSecondPass(tail.secondPass);
+            markTailDirty();
+            invalidatePanel();
+        }
+
+        // click was confirmed on the prune button
+        void clickPrune()
+        {
+            // Fires through its registered command id (not the session directly) so the panel
+            // affordance and the bindable action share the one guarded dry-run/confirm/delete
+            // path in doBankPruneFolder.
+            const int cmd = bankPruneCommandId();
+            if (cmd != 0) Main_OnCommand(cmd, 0);
+        }
+    }
+
+
+
+    // Returns: true if the click was inside the footer bar,
+    //          false if the click was outside the footer bar.
+    bool handleFooterClick(int x, int y, int w, int h)
+    {
+
+        const ButtonRect pb = pruneButtonRectFor(w, h);
+        if (hitTestPruneButton(x, y, pb)) {
+            clickPrune();
+            return true;
+        }
+
+        const FooterBarLayout fb = footerBarLayoutFor(w, h);
+        if (g_panel.session) {
+            FooterHit clicked = hitTestFooterBar(x, y, fb);
+
+            // The short-circuit cases
+            if (clicked == FooterHit::Outside) { return false; }
+            if (clicked == FooterHit::Invalid) { return true; }
+
+            // Check actual clickable elements:
+
+            // Cycles None -> Auto -> Manual -> None
+            if (clicked == FooterHit::Tail) { clickTail(); }
+
+            // Detect which segment was selected and activate that mode
+            if (clicked == FooterHit::Toggle) { clickToggle(x, y, fb.toggle); }
+
+            // Toggle 2nd Pass Render
+            if (clicked == FooterHit::SecondPass) { clickSecondPass(); }
+
+            return true;
+        }
+
+        // If we reach this point, no valid click target inside the footer was hit.
+        return false;
+    }
+
+    bool handleFooterWheel(int x, int y, int delta) {
+        if (!g_panel.session) return false;
+
+        TailSetting& tail = g_panel.session->tail();
+        if (tail.mode != TailMode::Manual) return false;  // fine-adjust is Manual-only
+
+        // One notch is WHEEL_DELTA (120); accumulate whole notches so a high-res trackpad
+        // that sends fractional deltas still steps predictably. Sign carries direction.
+        const int notches = delta / 120;
+        if (notches == 0) return false;  // sub-notch movement — nothing to apply yet
+
+        const double before = tail.manualMs;
+        tail.manualMs = adjustManualMs(tail.manualMs, notches, kManualStepMs);
+        if (tail.manualMs == before) return true;  // already at a bound — consumed, no change
+
+        markTailDirty();
+        invalidatePanel();  // label shows the new length live
+        return true;
+    }
+}

src/shell/panel/footer_input.h

@@ -0,0 +1,9 @@
+#pragma once
+
+namespace reasampler::panel {
+
+    bool handleFooterClick(int x, int y, int w, int h);
+
+    bool handleFooterWheel(int x, int y, int delta);
+
+}

src/shell/panel/panel_drag.cpp

@@ -274,7 +274,9 @@ Hover resolveHover(int x, int y) {
         const int seg = footerToggleSegmentHit(x, y, w, h);
         if (seg >= 0) return Hover{HoverKind::ModeSegment, seg};
         const FooterBarLayout fb = footerBarLayoutFor(w, h);
-        if (hitTestFooterBar(x, y, fb) == FooterHit::Tail) return Hover{HoverKind::TailButton, -1};
+        const FooterHit footerHit = hitTestFooterBar(x, y, fb);
+        if (footerHit == FooterHit::Tail) return Hover{HoverKind::TailButton, -1};
+        if (footerHit == FooterHit::SecondPass) return Hover{HoverKind::SecondPassButton, -1};
         const ButtonRect pb = pruneButtonRectFor(w, h);
         if (hitTestPruneButton(x, y, pb)) return Hover{HoverKind::PruneButton, -1};
     }

src/shell/panel/panel_input.cpp

@@ -13,6 +13,7 @@
 
 #include "shell/panel/panel_state.h"
 #include "shell/panel/panel_input.h"
+#include "shell/panel/footer_input.h"
 
 #include "shell/actions/bank_actions.h" // bankPruneCommandId — the footer Prune dispatch
 #include "shell/persist/session.h"      // ReaSamplerSession — view/tail reads + mutation
@@ -61,15 +62,6 @@ int modeActivateCommandId(const std::string& modeId) {
 
 namespace {
 
-// Commits the current tail setting to ext state and marks the active project dirty so the
-// change travels inside the .rpp on Ctrl+S — closes the gap where toggle/scroll would dirty
-// the project but never write the new value. No-ops cleanly on an unsaved project.
-void markTailDirty() {
-    if (g_panel.session) g_panel.session->saveToActiveProject();
-    ReaProject* proj = EnumProjects(-1, nullptr, 0);
-    if (proj) MarkProjectDirty(proj);
-}
-
 // Routes a click in a toolbar to the hit button's action via Main_OnCommand. Returns true
 // iff the click was inside the bar band, so the caller stops before grid handling.
 bool handleToolbarClick(int x, int y, const ActionBarRect& bar,
@@ -332,46 +324,9 @@ void handleClick(int x, int y) {
     // the More button) so a click there is inert chrome, never a fall-through to the grid.
     if (y >= 0 && y < kTopToolbarHeight && x >= 0 && x < w) return;
 
-    // Footer: mode toggle (left) -> Tail button -> Prune (right). Checked before the bottom
+    // Footer: mode toggle (left) -> Tail button -> 2nd Pass Render -> Prune (right). Checked before the bottom
     // toolbar / grid so a footer click never selects a cell.
-    {
-        const int seg = footerToggleSegmentHit(x, y, w, h);
-        if (seg >= 0) {
-            const ViewModeModel& view = g_panel.session->view();
-            const std::vector<Mode>& modes = view.modes().all();
-            if (seg < static_cast<int>(modes.size())) {
-                const std::string& id = modes[static_cast<std::size_t>(seg)].id;
-                const bool isActive = id == view.activeModeId();
-                const int cmd = modeActivateCommandId(id);
-                // Disabled/dead rationale: core/ui/footer_bar.h. Claimed but inert, the
-                // same shape a disabled toolbar row takes — never falls through to the grid.
-                if (modeSegmentEnabled(isActive, g_panel.modeSwitchBlocked, cmd != 0)) {
-                    if (cmd != 0 && Main_OnCommand) Main_OnCommand(cmd, 0);
-                }
-            }
-            return;
-        }
-
-        const FooterBarLayout fb = footerBarLayoutFor(w, h);
-        if (g_panel.session && hitTestFooterBar(x, y, fb) == FooterHit::Tail) {
-            // Cycles None -> Auto -> Manual -> None; touches NOTHING in the bank/arrange.
-            TailSetting& tail = g_panel.session->tail();
-            tail.mode = cycleTailMode(tail.mode);
-            markTailDirty();
-            invalidatePanel();
-            return;
-        }
-
-        // Fires through its registered command id (not the session directly) so the panel
-        // affordance and the bindable action share the one guarded dry-run/confirm/delete
-        // path in doBankPruneFolder.
-        const ButtonRect pb = pruneButtonRectFor(w, h);
-        if (hitTestPruneButton(x, y, pb)) {
-            const int cmd = bankPruneCommandId();
-            if (cmd != 0) Main_OnCommand(cmd, 0);
-            return;
-        }
-    }
+    if (handleFooterClick(x, y, w, h)) return;
 
     if (handleToolbarClick(x, y, bottomToolbarRect(w, h), bottomBarRows())) return;
 
@@ -456,24 +411,10 @@ void handleClick(int x, int y) {
 // [0, kMaxTailMs]. Otherwise does nothing (returns false so the caller can let REAPER/the
 // docker handle the wheel normally). Returns true iff the wheel was consumed.
 bool handleWheel(int x, int y, int delta) {
-    if (!g_panel.session) return false;
-    if (!pointInFooter(x, y)) return false;
+    if (pointInFooter(x, y)) return handleFooterWheel(x, y, delta);
 
-    TailSetting& tail = g_panel.session->tail();
-    if (tail.mode != TailMode::Manual) return false;  // fine-adjust is Manual-only
-
-    // One notch is WHEEL_DELTA (120); accumulate whole notches so a high-res trackpad
-    // that sends fractional deltas still steps predictably. Sign carries direction.
-    const int notches = delta / 120;
-    if (notches == 0) return false;  // sub-notch movement — nothing to apply yet
-
-    const double before = tail.manualMs;
-    tail.manualMs = adjustManualMs(tail.manualMs, notches, kManualStepMs);
-    if (tail.manualMs == before) return true;  // already at a bound — consumed, no change
-
-    markTailDirty();
-    invalidatePanel();  // label shows the new length live
-    return true;
+    // Unhandled
+    return false;
 }
 
 namespace {

src/shell/panel/panel_render.cpp

@@ -165,6 +165,19 @@ void drawFooter(LICE_IBitmap* bmp, int w, int h) {
         drawButton(bmp, box, label.c_str(), state, /*warn=*/false);
     }
 
+    // 2nd Pass Render BUTTON
+    if (!fb.secondPass.empty()) {
+        const TailSetting tail = currentTail();
+        const InteractionState state = tail.secondPass
+            ? InteractionState::Active
+            : hoverState(g_panel.hovered, HoverKind::SecondPassButton, -1);
+        const std::string label = "2nd Pass";
+        const KitButtonBox box{
+            KitBox{fb.secondPass.x, fb.secondPass.y, fb.secondPass.width, fb.secondPass.height}
+        };
+        drawButton(bmp, box, label.c_str(), state, /*warn=*/false);
+    }
+
     // Version/channel readout. appVersion() renders the configured version string on
     // stable and that string plus "-beta" on beta, so a beta panel self-identifies.
     kitText(bmp, KitBox{f.left, f.top, (f.right - f.left) - 8, f.bottom - f.top},

src/shell/panel/panel_state.h

@@ -272,6 +272,7 @@ enum class HoverKind {
     CreateBank,
     Tab,              // index = tab ordinal
     TailButton,
+    SecondPassButton,
     ModeSegment,      // index = segment ordinal
 };