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

ShhShell.xcodeproj/project.pbxproj

@@ -72,6 +72,7 @@
 		A96C6B022E0C49E800F377FE /* CenteredLabel.swift in Sources */ = {isa = PBXBuildFile; fileRef = A96C6B012E0C49E800F377FE /* CenteredLabel.swift */; };
 		A96C90A12E12B87A00724253 /* TextBox.swift in Sources */ = {isa = PBXBuildFile; fileRef = A96C90A02E12B87900724253 /* TextBox.swift */; };
 		A96C90A32E12D53B00724253 /* KeyType.swift in Sources */ = {isa = PBXBuildFile; fileRef = A96C90A22E12D53900724253 /* KeyType.swift */; };
+		A97AF1802E5D07BE00829443 /* CRTView.swift in Sources */ = {isa = PBXBuildFile; fileRef = A97AF17F2E5D07BE00829443 /* CRTView.swift */; };
 		A9835C3C2E17CCA500969508 /* TrafficLights.swift in Sources */ = {isa = PBXBuildFile; fileRef = A9835C3B2E17CCA500969508 /* TrafficLights.swift */; };
 		A98554552E05535F009051BD /* KeyManagerView.swift in Sources */ = {isa = PBXBuildFile; fileRef = A98554542E05535F009051BD /* KeyManagerView.swift */; };
 		A98554592E0553AA009051BD /* KeyManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = A98554582E0553AA009051BD /* KeyManager.swift */; };
@@ -212,6 +213,7 @@
 		A96C6B012E0C49E800F377FE /* CenteredLabel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CenteredLabel.swift; sourceTree = "<group>"; };
 		A96C90A02E12B87900724253 /* TextBox.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TextBox.swift; sourceTree = "<group>"; };
 		A96C90A22E12D53900724253 /* KeyType.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KeyType.swift; sourceTree = "<group>"; };
+		A97AF17F2E5D07BE00829443 /* CRTView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CRTView.swift; sourceTree = "<group>"; };
 		A9835C3B2E17CCA500969508 /* TrafficLights.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TrafficLights.swift; sourceTree = "<group>"; };
 		A98554542E05535F009051BD /* KeyManagerView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KeyManagerView.swift; sourceTree = "<group>"; };
 		A98554582E0553AA009051BD /* KeyManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KeyManager.swift; sourceTree = "<group>"; };
@@ -358,6 +360,7 @@
 			children = (
 				A923172E2E08851200ECE1E6 /* ShellView.swift */,
 				A9FD37682E16A6BF005319A8 /* ShellTabView.swift */,
+				A97AF17F2E5D07BE00829443 /* CRTView.swift */,
 			);
 			path = Terminal;
 			sourceTree = "<group>";
@@ -873,6 +876,7 @@
 				A98554592E0553AA009051BD /* KeyManager.swift in Sources */,
 				A93F283D2E2A5DCB0092B8D5 /* SnippetManagerView.swift in Sources */,
 				A9C060EB2E357FD300CA9374 /* Haptics.swift in Sources */,
+				A97AF1802E5D07BE00829443 /* CRTView.swift in Sources */,
 				A9C897EF2DF1A9A400EF9A5F /* SSHHandler.swift in Sources */,
 				A9D819312E102D8700442D38 /* HostkeysView.swift in Sources */,
 				A98554552E05535F009051BD /* KeyManagerView.swift in Sources */,

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

@@ -20,13 +20,27 @@ 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)
+//					.visualEffect { content, proxy in
+//						content
+//							.layerEffect(
+//							ShaderLibrary.crt(
+//								.float2(proxy.size),
+//								.float(time)
+//							),
+//							maxSampleOffset: .zero
+//						)
+//					}
+					.overlay {
+						if hostsManager.settings.filter == .crt {
+							CRTView()
+						}
+					}
 				
 				Group {
 					Color.gray.opacity(0.2)
@@ -49,17 +63,6 @@ struct ShellView: View {
 						AudioServicesPlaySystemSound(1103)
 					}
 				}
-					.visualEffect { content, proxy in
-						content
-							.colorEffect(
-								ShaderLibrary.crt(
-									.float2(proxy.size),
-									.float(time)
-								),
-								isEnabled: shaderEnabled
-							)
-					}
-				}
 			}
 		}
 	}