diff --git a/Cargo.lock b/Cargo.lock
index fa4b4fc..7e09314 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3171,6 +3171,8 @@ dependencies = [
  "anyhow",
  "cpal",
  "curlywas",
+ "env_logger 0.9.0",
+ "log",
  "notify",
  "pico-args",
  "rubato",
@@ -3207,6 +3209,7 @@ dependencies = [
  "env_logger 0.9.0",
  "log",
  "minifb",
+ "pico-args",
  "pollster",
  "wgpu",
  "winapi 0.3.9",
diff --git a/Cargo.toml b/Cargo.toml
index 4fe2c03..5addf32 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,6 +13,8 @@ browser = ["warp", "tokio", "tokio-stream", "webbrowser"]
 [dependencies]
 wasmtime = { version = "0.37.0", optional = true }
 anyhow = "1"
+env_logger = "0.9"
+log = "0.4"
 uw8-window = { path = "uw8-window", optional = true }
 notify = "4"
 pico-args = "0.4"
diff --git a/README.md b/README.md
index 0989a30..39e839a 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,27 @@ Options:
 -l LEVEL, --level LEVEL : Compression level (0-9). Higher compression levels are really slow.
 -o FILE, --output FILE  : Write the loaded and optionally packed cart back to disk.
 
+when using the native runtime:
+
+-m, --no-audio          : Disable audio, also reduces cpu load a bit
+--no-gpu                : Force old cpu-only window code
+--filter FILTER         : Select an upscale filter at startup
+--fullscreen            : Start in fullscreen mode
+
+Note that the cpu-only window does not support fullscreen nor upscale filters.
+
+Unless --no-gpu is given, uw8 will first try to open a gpu accelerated window, falling back to the old cpu-only window if that fails.
+Therefore you should rarely need to manually pass --no-gpu. If you prefer the old pixel doubling look to the now default crt filter,
+you can just pass "--filter nearest" or "--filter 1".
+
+The upscale filter options are:
+1, nearest              : Anti-aliased nearest filter
+2, fast_crt             : Very simple, cheap crt filter, not very good below a window size of 960x720
+3, ss_crt               : Super sampled crt filter, a little more demanding on the GPU but scales well to smaller window sizes
+4, chromatic_crt        : Variant of fast_crt with a slight offset of the three color dots of a pixel, still pretty cheap
+5, auto_crt (default)   : ss_crt below 960x720, chromatic_crt otherwise
+
+You can switch the upscale filter at any time using the keys 1-5. You can toggle fullscreen with F.
 
 uw8 pack [<options>] <infile> <outfile>
 
diff --git a/site/content/docs.md b/site/content/docs.md
index d69a34f..c26c2d8 100644
--- a/site/content/docs.md
+++ b/site/content/docs.md
@@ -436,6 +436,30 @@ and execution of the cart is stopped. Defaults to 30 (0.5s)
 * `-l LEVEL`, `--level LEVEL`: Compression level (0-9). Higher compression levels are really slow.
 * `-o FILE`, `--output FILE`: Write the loaded and optionally packed cart back to disk.
 
+when using the native runtime:
+
+* `-m`, `--no-audio`: Disable audio, also reduces cpu load a bit
+* `--no-gpu`:  Force old cpu-only window code
+* `--filter FILTER`:  Select an upscale filter at startup
+* `--fullscreen`:  Start in fullscreen mode
+
+Note that the cpu-only window does not support fullscreen nor upscale filters.
+
+Unless --no-gpu is given, uw8 will first try to open a gpu accelerated window, falling back to the old cpu-only window if that fails.
+Therefore you should rarely need to manually pass --no-gpu. If you prefer the old pixel doubling look to the now default crt filter,
+you can just pass `--filter nearest` or `--filter 1`.
+
+The upscale filter options are:
+```
+1, nearest              : Anti-aliased nearest filter
+2, fast_crt             : Very simple, cheap crt filter, not very good below a window size of 960x720
+3, ss_crt               : Super sampled crt filter, a little more demanding on the GPU but scales well to smaller window sizes
+4, chromatic_crt        : Variant of fast_crt with a slight offset of the three color dots of a pixel, still pretty cheap
+5, auto_crt (default)   : ss_crt below 960x720, chromatic_crt otherwise
+```
+
+You can switch the upscale filter at any time using the keys 1-5. You can toggle fullscreen with F.
+
 ## `uw8 pack`
 
 Usage:
diff --git a/src/main.rs b/src/main.rs
index 93e0c03..f1fc3c7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,6 +13,7 @@ use uw8::RunWebServer;
 use uw8::Runtime;
 
 fn main() -> Result<()> {
+    env_logger::Builder::from_env(env_logger::Env::default()).init();
     let mut args = Arguments::from_env();
 
     // try to enable ansi support in win10 cmd shell
@@ -35,7 +36,7 @@ fn main() -> Result<()> {
             println!();
             println!("Usage:");
             #[cfg(any(feature = "native", feature = "browser"))]
-            println!("  uw8 run [-t/--timeout <frames>] [--no-gpu] [--b/--browser] [-w/--watch] [-p/--pack] [-u/--uncompressed] [-l/--level] [-o/--output <out-file>] <file>");
+            println!("  uw8 run [-t/--timeout <frames>] [--b/--browser] [-w/--watch] [-p/--pack] [-u/--uncompressed] [-l/--level] [-o/--output <out-file>] <file>");
             println!("  uw8 pack [-u/--uncompressed] [-l/--level] <in-file> <out-file>");
             println!("  uw8 unpack <in-file> <out-file>");
             println!("  uw8 compile [-d/--debug] <in-file> <out-file>");
@@ -54,8 +55,6 @@ fn run(mut args: Arguments) -> Result<()> {
     let watch_mode = args.contains(["-w", "--watch"]);
     #[allow(unused)]
     let timeout: Option<u32> = args.opt_value_from_str(["-t", "--timeout"])?;
-    #[allow(unused)]
-    let gpu = !args.contains("--no-gpu");
 
     let mut config = Config::default();
     if args.contains(["-p", "--pack"]) {
@@ -82,7 +81,16 @@ fn run(mut args: Arguments) -> Result<()> {
     #[cfg(not(feature = "native"))]
     let run_browser = args.contains(["-b", "--browser"]) || true;
 
-    let disable_audio = args.contains(["-m", "--disable-audio"]);
+    let disable_audio = args.contains(["-m", "--no-audio"]);
+
+    #[cfg(feature = "native")]
+    let window_config = {
+        let mut config = WindowConfig::default();
+        if !run_browser {
+            config.parse_arguments(&mut args);
+        }
+        config
+    };
 
     let filename = args.free_from_os_str::<PathBuf, bool>(|s| Ok(s.into()))?;
 
@@ -90,12 +98,14 @@ fn run(mut args: Arguments) -> Result<()> {
 
     use std::process::exit;
 
+    use uw8_window::WindowConfig;
+
     let mut runtime: Box<dyn Runtime> = if !run_browser {
         #[cfg(not(feature = "native"))]
         unimplemented!();
         #[cfg(feature = "native")]
         {
-            let mut microw8 = MicroW8::new(timeout, gpu)?;
+            let mut microw8 = MicroW8::new(timeout, window_config)?;
             if disable_audio {
                 microw8.disable_audio();
             }
diff --git a/src/run_native.rs b/src/run_native.rs
index c15a322..1e3ee41 100644
--- a/src/run_native.rs
+++ b/src/run_native.rs
@@ -5,7 +5,7 @@ use std::{thread, time::Instant};
 use anyhow::{anyhow, Result};
 use cpal::traits::*;
 use rubato::Resampler;
-use uw8_window::Window;
+use uw8_window::{Window, WindowConfig};
 use wasmtime::{
     Engine, GlobalType, Memory, MemoryType, Module, Mutability, Store, TypedFunc, ValType,
 };
@@ -45,7 +45,7 @@ struct UW8WatchDog {
 }
 
 impl MicroW8 {
-    pub fn new(timeout: Option<u32>, gpu: bool) -> Result<MicroW8> {
+    pub fn new(timeout: Option<u32>, window_config: WindowConfig) -> Result<MicroW8> {
         let mut config = wasmtime::Config::new();
         config.cranelift_opt_level(wasmtime::OptLevel::Speed);
         if timeout.is_some() {
@@ -56,7 +56,7 @@ impl MicroW8 {
         let loader_module =
             wasmtime::Module::new(&engine, include_bytes!("../platform/bin/loader.wasm"))?;
 
-        let window = Window::new(gpu)?;
+        let window = Window::new(window_config)?;
 
         Ok(MicroW8 {
             window,
diff --git a/uw8-window/Cargo.lock b/uw8-window/Cargo.lock
index e944fb7..34ba9e1 100644
--- a/uw8-window/Cargo.lock
+++ b/uw8-window/Cargo.lock
@@ -986,6 +986,12 @@ version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
 
+[[package]]
+name = "pico-args"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db8bcd96cb740d03149cbad5518db9fd87126a10ab519c011893b1754134c468"
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.9"
@@ -1296,6 +1302,7 @@ dependencies = [
  "env_logger",
  "log",
  "minifb",
+ "pico-args",
  "pollster",
  "wgpu",
  "winapi",
diff --git a/uw8-window/Cargo.toml b/uw8-window/Cargo.toml
index 11eff51..8ef2236 100644
--- a/uw8-window/Cargo.toml
+++ b/uw8-window/Cargo.toml
@@ -9,6 +9,7 @@ edition = "2021"
 winit = "0.26.1"
 env_logger = "0.9"
 log = "0.4"
+pico-args = "0.4"
 wgpu = "0.13.1"
 pollster = "0.2"
 bytemuck = { version = "1.4", features = [ "derive" ] }
diff --git a/uw8-window/src/cpu.rs b/uw8-window/src/cpu.rs
index 02081b3..1e026e3 100644
--- a/uw8-window/src/cpu.rs
+++ b/uw8-window/src/cpu.rs
@@ -78,6 +78,6 @@ impl WindowImpl for Window {
     }
 
     fn is_open(&self) -> bool {
-        self.window.is_open()
+        self.window.is_open() && !self.window.is_key_down(Key::Escape)
     }
 }
diff --git a/uw8-window/src/gpu/mod.rs b/uw8-window/src/gpu/mod.rs
index 407eab5..f8811e5 100644
--- a/uw8-window/src/gpu/mod.rs
+++ b/uw8-window/src/gpu/mod.rs
@@ -1,4 +1,4 @@
-use crate::{Input, WindowImpl};
+use crate::{Input, WindowConfig, WindowImpl};
 use anyhow::{anyhow, Result};
 use std::{num::NonZeroU32, time::Instant};
 
@@ -37,13 +37,18 @@ pub struct Window {
 }
 
 impl Window {
-    pub fn new() -> Result<Window> {
-        async fn create() -> Result<Window> {
+    pub fn new(window_config: WindowConfig) -> Result<Window> {
+        async fn create(window_config: WindowConfig) -> Result<Window> {
             let event_loop = EventLoop::new();
             let window = WindowBuilder::new()
                 .with_inner_size(PhysicalSize::new(640u32, 480))
                 .with_min_inner_size(PhysicalSize::new(320u32, 240))
                 .with_title("MicroW8")
+                .with_fullscreen(if window_config.fullscreen {
+                    Some(Fullscreen::Borderless(None))
+                } else {
+                    None
+                })
                 .build(&event_loop)?;
 
             window.set_cursor_visible(false);
@@ -73,12 +78,13 @@ impl Window {
                 present_mode: wgpu::PresentMode::AutoNoVsync,
             };
 
-            let filter: Box<dyn Filter> = Box::new(AutoCrtFilter::new(
+            let filter: Box<dyn Filter> = create_filter(
                 &device,
                 &palette_screen_mode.screen_view,
                 window.inner_size(),
                 surface_config.format,
-            ));
+                window_config.filter,
+            );
 
             surface.configure(&device, &surface_config);
 
@@ -95,12 +101,12 @@ impl Window {
                 filter,
                 gamepads: [0; 4],
                 next_frame: Instant::now(),
-                is_fullscreen: false,
+                is_fullscreen: window_config.fullscreen,
                 is_open: true,
             })
         }
 
-        pollster::block_on(create())
+        pollster::block_on(create(window_config))
     }
 }
 
@@ -109,6 +115,7 @@ impl WindowImpl for Window {
         let mut reset = false;
         self.event_loop.run_return(|event, _, control_flow| {
             *control_flow = ControlFlow::WaitUntil(self.next_frame);
+            let mut new_filter = None;
             match event {
                 Event::WindowEvent { event, .. } => match event {
                     WindowEvent::Resized(new_size) => {
@@ -153,48 +160,11 @@ impl WindowImpl for Window {
                                     self.window.set_fullscreen(fullscreen);
                                 }
                                 Some(VirtualKeyCode::R) => reset = true,
-                                Some(VirtualKeyCode::Key1) => {
-                                    self.filter = Box::new(SquareFilter::new(
-                                        &self.device,
-                                        &self.palette_screen_mode.screen_view,
-                                        self.window.inner_size(),
-                                        self.surface_config.format,
-                                    ))
-                                }
-                                Some(VirtualKeyCode::Key2) => {
-                                    self.filter = Box::new(FastCrtFilter::new(
-                                        &self.device,
-                                        &self.palette_screen_mode.screen_view,
-                                        self.window.inner_size(),
-                                        self.surface_config.format,
-                                        false,
-                                    ))
-                                }
-                                Some(VirtualKeyCode::Key3) => {
-                                    self.filter = Box::new(CrtFilter::new(
-                                        &self.device,
-                                        &self.palette_screen_mode.screen_view,
-                                        self.window.inner_size(),
-                                        self.surface_config.format,
-                                    ))
-                                }
-                                Some(VirtualKeyCode::Key4) => {
-                                    self.filter = Box::new(FastCrtFilter::new(
-                                        &self.device,
-                                        &self.palette_screen_mode.screen_view,
-                                        self.window.inner_size(),
-                                        self.surface_config.format,
-                                        true,
-                                    ))
-                                }
-                                Some(VirtualKeyCode::Key5) => {
-                                    self.filter = Box::new(AutoCrtFilter::new(
-                                        &self.device,
-                                        &self.palette_screen_mode.screen_view,
-                                        self.window.inner_size(),
-                                        self.surface_config.format,
-                                    ))
-                                }
+                                Some(VirtualKeyCode::Key1) => new_filter = Some(1),
+                                Some(VirtualKeyCode::Key2) => new_filter = Some(2),
+                                Some(VirtualKeyCode::Key3) => new_filter = Some(3),
+                                Some(VirtualKeyCode::Key4) => new_filter = Some(4),
+                                Some(VirtualKeyCode::Key5) => new_filter = Some(5),
                                 _ => (),
                             }
 
@@ -215,6 +185,15 @@ impl WindowImpl for Window {
                 }
                 _ => (),
             }
+            if let Some(new_filter) = new_filter {
+                self.filter = create_filter(
+                    &self.device,
+                    &self.palette_screen_mode.screen_view,
+                    self.window.inner_size(),
+                    self.surface_config.format,
+                    new_filter,
+                );
+            }
         });
         Input {
             gamepads: self.gamepads,
@@ -269,6 +248,49 @@ impl WindowImpl for Window {
     }
 }
 
+fn create_filter(
+    device: &wgpu::Device,
+    screen_texture: &wgpu::TextureView,
+    window_size: PhysicalSize<u32>,
+    surface_format: wgpu::TextureFormat,
+    filter: u32,
+) -> Box<dyn Filter> {
+    match filter {
+        1 => Box::new(SquareFilter::new(
+            device,
+            screen_texture,
+            window_size,
+            surface_format,
+        )),
+        2 => Box::new(FastCrtFilter::new(
+            device,
+            screen_texture,
+            window_size,
+            surface_format,
+            false,
+        )),
+        3 => Box::new(CrtFilter::new(
+            device,
+            screen_texture,
+            window_size,
+            surface_format,
+        )),
+        4 => Box::new(FastCrtFilter::new(
+            device,
+            screen_texture,
+            window_size,
+            surface_format,
+            true,
+        )),
+        _ => Box::new(AutoCrtFilter::new(
+            device,
+            screen_texture,
+            window_size,
+            surface_format,
+        )),
+    }
+}
+
 trait Filter {
     fn resize(&mut self, queue: &wgpu::Queue, new_size: PhysicalSize<u32>);
     fn render<'a>(&'a self, render_pass: &mut wgpu::RenderPass<'a>);
diff --git a/uw8-window/src/lib.rs b/uw8-window/src/lib.rs
index 328f84a..dd2dd27 100644
--- a/uw8-window/src/lib.rs
+++ b/uw8-window/src/lib.rs
@@ -7,9 +7,9 @@ mod gpu;
 pub struct Window(Box<dyn WindowImpl>);
 
 impl Window {
-    pub fn new(gpu: bool) -> Result<Window> {
-        if gpu {
-            match gpu::Window::new() {
+    pub fn new(config: WindowConfig) -> Result<Window> {
+        if config.enable_gpu {
+            match gpu::Window::new(config) {
                 Ok(window) => return Ok(Window(Box::new(window))),
                 Err(err) => eprintln!(
                     "Failed to create gpu window: {}\nFalling back tp cpu window",
@@ -32,6 +32,43 @@ impl Window {
     }
 }
 
+#[derive(Debug)]
+pub struct WindowConfig {
+    enable_gpu: bool,
+    filter: u32,
+    fullscreen: bool,
+}
+
+impl Default for WindowConfig {
+    fn default() -> WindowConfig {
+        WindowConfig {
+            enable_gpu: true,
+            filter: 5,
+            fullscreen: false,
+        }
+    }
+}
+
+impl WindowConfig {
+    pub fn parse_arguments(&mut self, args: &mut pico_args::Arguments) {
+        self.enable_gpu = !args.contains("--no-gpu");
+        if let Some(filter) = args.opt_value_from_str::<_, String>("--filter").unwrap() {
+            self.filter = match filter.as_str() {
+                "1" | "nearest" => 1,
+                "2" | "fast_crt" => 2,
+                "3" | "ss_crt" => 3,
+                "4" | "chromatic" => 4,
+                "5" | "auto_crt" => 5,
+                o => {
+                    println!("Unknown --filter '{}'", o);
+                    std::process::exit(1);
+                }
+            }
+        }
+        self.fullscreen = args.contains("--fullscreen");
+    }
+}
+
 pub struct Input {
     pub gamepads: [u8; 4],
     pub reset: bool,
diff --git a/uw8-window/src/main.rs b/uw8-window/src/main.rs
index 15a155c..d7bf52a 100644
--- a/uw8-window/src/main.rs
+++ b/uw8-window/src/main.rs
@@ -1,8 +1,11 @@
 use std::time::Instant;
+use uw8_window::WindowConfig;
 
 fn main() {
     env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();
 
+    let mut args = pico_args::Arguments::from_env();
+
     let mut framebuffer = vec![0u8; 320 * 240];
     let mut start_time = Instant::now();
 
@@ -18,7 +21,10 @@ fn main() {
     let mut fps_start = Instant::now();
     let mut fps_counter = 0;
 
-    let mut window = uw8_window::Window::new(true).unwrap();
+    let mut window_config = WindowConfig::default();
+    window_config.parse_arguments(&mut args);
+
+    let mut window = uw8_window::Window::new(window_config).unwrap();
 
     while window.is_open() {
         let input = window.begin_frame();