got it working by overlaying another view on top, still need to fix the brightness issue tho

ShhShell/Terminal/CRT.metal

@@ -17,7 +17,8 @@ using namespace metal;
 	
 	//scanlines
 	newCol *= 0.5 + 0.5 * sin(uv.y * 1250.0);
-	half4 output = half4(color.xyz*newCol, 1);
+//	half4 output = half4(layer.sample(pos).xyz*newCol, 1);
+	half4 output = half4(color.xyz*newCol*0.24, 0.25);
 	return output;
 }
 

ShhShell/Views/ContentView.swift

@@ -18,6 +18,13 @@ struct ContentView: View {
 				hostsManager.selectedTheme.background.suiColor.opacity(0.7)
 					.ignoresSafeArea(.all)
 				List {
+					ForEach(0..<6) {
+						Color.red.frame(width: 60, height: 60, alignment: .center)
+							.brightness(Double($0) * 0.2)
+							.overlay(Text("\(Double($0) * 0.2 * 100, specifier: "%.0f")%"),
+									 alignment: .bottom)
+							.border(Color.gray)
+					}
 					SessionsListView(
 						handler: handler,
 						hostsManager: hostsManager,

ShhShell/Views/Terminal/CRTView.swift

@@ -0,0 +1,33 @@
+//
+//  CRTView.swift
+//  ShhShell
+//
+//  Created by neon443 on 25/08/2025.
+//
+
+import SwiftUI
+
+struct CRTView: View {
+	@State var startTime: Date = .now
+	
+	var body: some View {
+		TimelineView(.animation) { tl in
+			let time = tl.date.distance(to: startTime)
+			Rectangle()
+				.foregroundStyle(.white.opacity(0.1))
+				.visualEffect { content, proxy in
+					content
+						.colorEffect(
+							ShaderLibrary.crt(
+								.float2(proxy.size),
+								.float(time)
+							)
+						)
+				}
+		}
+	}
+}
+
+#Preview {
+    CRTView()
+}

ShhShell/Views/Terminal/ShellView.swift

@@ -20,44 +20,47 @@ struct ShellView: View {
 	
 	var body: some View {
 		NavigationStack {
+			let time = startTime.timeIntervalSinceNow
 			ZStack {
-				TimelineView(.animation) { tl in
-					let time = tl.date.distance(to: startTime)
-					let shaderEnabled = hostsManager.settings.filter == .crt
-					hostsManager.selectedTheme.background.suiColor
-						.ignoresSafeArea(.all)
-					TerminalController(handler: handler, hostsManager: hostsManager)
-					
-					Group {
-						Color.gray.opacity(0.2)
-							.transition(.opacity)
-						Image(systemName: "bell.fill")
-							.foregroundStyle(
-								hostsManager.selectedTheme.background.luminance > 0.5 ?
-									.black : .white
-							)
-							.font(.largeTitle)
-							.shadow(color: .black, radius: 5)
-					}
-					.opacity(handler.bell ? 1 : 0)
-					.onChange(of: handler.bell) { _ in
-						guard handler.bell else { return }
-						if hostsManager.settings.bellHaptic {
-							Haptic.warning.trigger()
-						}
-						if hostsManager.settings.bellSound {
-							AudioServicesPlaySystemSound(1103)
+				hostsManager.selectedTheme.background.suiColor
+					.ignoresSafeArea(.all)
+				
+				TerminalController(handler: handler, hostsManager: hostsManager)
+//					.visualEffect { content, proxy in
+//						content
+//							.layerEffect(
+//							ShaderLibrary.crt(
+//								.float2(proxy.size),
+//								.float(time)
+//							),
+//							maxSampleOffset: .zero
+//						)
+//					}
+					.overlay {
+						if hostsManager.settings.filter == .crt {
+							CRTView()
 						}
 					}
-					.visualEffect { content, proxy in
-						content
-							.colorEffect(
-								ShaderLibrary.crt(
-									.float2(proxy.size),
-									.float(time)
-								),
-								isEnabled: shaderEnabled
-							)
+				
+				Group {
+					Color.gray.opacity(0.2)
+						.transition(.opacity)
+					Image(systemName: "bell.fill")
+						.foregroundStyle(
+							hostsManager.selectedTheme.background.luminance > 0.5 ?
+								.black : .white
+						)
+						.font(.largeTitle)
+						.shadow(color: .black, radius: 5)
+				}
+				.opacity(handler.bell ? 1 : 0)
+				.onChange(of: handler.bell) { _ in
+					guard handler.bell else { return }
+					if hostsManager.settings.bellHaptic {
+						Haptic.warning.trigger()
+					}
+					if hostsManager.settings.bellSound {
+						AudioServicesPlaySystemSound(1103)
 					}
 				}
 			}