feat(weld): add sidechain test build

Weld will phase-align a bass layer to another layer it hears through the
sidechain. This first build only checks that FL Studio delivers the
sidechain to a CLAP aux port: it passes the main layer through unchanged,
meters the sidechain and offers Layer/Sum/Sum dry listening. No latency.

tools/editor-check/src/main.rs

@@ -10,8 +10,8 @@ fn main() {
         .find(|a| a[0] == "--plugin")
         .map(|a| a[1].as_str())
         .unwrap_or("rivet");
-    if !["rivet", "patina", "anvil", "crucible", "lathe", "temper"].contains(&plugin) {
-        eprintln!("Use --plugin rivet, patina, anvil, crucible, lathe or temper");
+    if !["rivet", "patina", "anvil", "crucible", "lathe", "temper", "weld"].contains(&plugin) {
+        eprintln!("Use --plugin rivet, patina, anvil, crucible, lathe, temper or weld");
         std::process::exit(2);
     }
     let patina = plugin == "patina" || args.iter().any(|arg| arg == "--resonance");
@@ -20,7 +20,10 @@ fn main() {
     let crucible = plugin == "crucible";
     let lathe = plugin == "lathe";
     let temper = plugin == "temper";
-    let (width, height) = if temper {
+    let weld = plugin == "weld";
+    let (width, height) = if weld {
+        (weld_ui::WIDTH, weld_ui::HEIGHT)
+    } else if temper {
         (temper_ui::WIDTH, temper_ui::HEIGHT)
     } else if lathe {
         (lathe_ui::WIDTH, lathe_ui::HEIGHT)
@@ -139,6 +142,22 @@ fn main() {
         }
         temper_state.accept_frame(engine.take_analyzer());
     }
+    let mut weld_settings = weld_core::Settings::default();
+    let mut weld_state = weld_ui::State::default();
+    if weld {
+        // Two layers of an F1 saw bass; the sidechain layer is polarity-flipped.
+        let mut engine = weld_core::Engine::new(48000., 2).unwrap();
+        engine.set_settings(weld_settings).unwrap();
+        let mut saw = common_dsp::Saw::new(48000., 43.65);
+        for i in 0..36000 {
+            let x = (saw.sample() * 1.6).tanh() * 0.4;
+            engine.process_sample([x, x], [-0.7 * x, -0.7 * x]);
+            if i % 1600 == 0 {
+                weld_state.accept_frame(engine.take_analyzer());
+            }
+        }
+        weld_state.accept_frame(engine.take_analyzer());
+    }
     let mut crucible_settings = crucible_core::Settings {
         folder: "C:\\Users\\you\\Documents\\Crucible".into(),
         ..Default::default()
@@ -227,7 +246,9 @@ fn main() {
     let session_motif = session.motifs[0].id;
     shared.replace(session).unwrap();
     let ctx = egui::Context::default();
-    if temper {
+    if weld {
+        weld_ui::style(&ctx);
+    } else if temper {
         temper_ui::style(&ctx);
     } else if lathe {
         lathe_ui::style(&ctx);
@@ -260,7 +281,9 @@ fn main() {
             },
             |ui| {
                 egui::CentralPanel::default().show(ui, |ui| {
-                    if temper {
+                    if weld {
+                        weld_ui::show(ui, &mut weld_settings, &mut weld_state);
+                    } else if temper {
                         temper_ui::show(ui, &mut temper_settings, &mut temper_state);
                     } else if lathe {
                         lathe_ui::show(ui, &mut lathe_settings, &mut lathe_state);