add some command line switches for the gpu window

Cargo.lock

@@ -3165,12 +3165,14 @@ checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
 [[package]]
 name = "uw8"
-version = "0.2.0"
+version = "0.2.1"
 dependencies = [
  "ansi_term",
  "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",

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"

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>
 

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:

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();
             }
@@ -167,7 +177,8 @@ fn load_cart(filename: &Path, config: &Config) -> (Result<Vec<u8>>, Vec<PathBuf>
         if let Some(ref pack_config) = config.pack {
             cart = uw8_tool::pack(&cart, pack_config)?;
             println!(
-                "\npacked size: {:.2} bytes",
+                "\npacked size: {} bytes ({:.2})",
+                cart.len(),
                 uw8_tool::compressed_size(&cart)
             );
         }

src/run_native.rs

@@ -5,23 +5,20 @@ use std::{thread, time::Instant};
 use anyhow::{anyhow, Result};
 use cpal::traits::*;
 use rubato::Resampler;
+use uw8_window::{Window, WindowConfig};
 use wasmtime::{
     Engine, GlobalType, Memory, MemoryType, Module, Mutability, Store, TypedFunc, ValType,
 };
 
 pub struct MicroW8 {
-    tx: mpsc::SyncSender<Option<UW8Instance>>,
-    rx: mpsc::Receiver<UIEvent>,
+    window: Window,
     stream: Option<cpal::Stream>,
     engine: Engine,
     loader_module: Module,
     disable_audio: bool,
     module_data: Option<Vec<u8>>,
-}
-
-enum UIEvent {
-    Error(Result<()>),
-    Reset,
+    timeout: u32,
+    instance: Option<UW8Instance>,
 }
 
 struct UW8Instance {
@@ -48,7 +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() {
@@ -59,39 +56,17 @@ impl MicroW8 {
         let loader_module =
             wasmtime::Module::new(&engine, include_bytes!("../platform/bin/loader.wasm"))?;
 
-        let (to_ui_tx, to_ui_rx) = mpsc::sync_channel(2);
-        let (from_ui_tx, from_ui_rx) = mpsc::sync_channel(1);
-
-        std::thread::spawn(move || {
-            let mut state = State {
-                instance: None,
-                timeout: timeout.unwrap_or(0),
-            };
-
-            uw8_window::run(gpu, move |framebuffer, gamepad, reset| {
-                while let Ok(instance) = to_ui_rx.try_recv() {
-                    state.instance = instance;
-                }
-
-                if reset {
-                    from_ui_tx.send(UIEvent::Reset).unwrap();
-                }
-
-                state.run_frame(framebuffer, gamepad).unwrap_or_else(|err| {
-                    from_ui_tx.send(UIEvent::Error(Err(err))).unwrap();
-                    Instant::now()
-                })
-            });
-        });
+        let window = Window::new(window_config)?;
 
         Ok(MicroW8 {
-            tx: to_ui_tx,
-            rx: from_ui_rx,
+            window,
             stream: None,
             engine,
             loader_module,
             disable_audio: false,
             module_data: None,
+            timeout: timeout.unwrap_or(0),
+            instance: None,
         })
     }
 
@@ -102,12 +77,12 @@ impl MicroW8 {
 
 impl super::Runtime for MicroW8 {
     fn is_open(&self) -> bool {
-        true
+        self.window.is_open()
     }
 
     fn load(&mut self, module_data: &[u8]) -> Result<()> {
         self.stream = None;
-        self.tx.send(None)?;
+        self.instance = None;
 
         let mut store = wasmtime::Store::new(&self.engine, ());
         store.set_epoch_deadline(60);
@@ -174,7 +149,7 @@ impl super::Runtime for MicroW8 {
             }
         };
 
-        self.tx.send(Some(UW8Instance {
+        self.instance = Some(UW8Instance {
             store,
             memory,
             end_frame,
@@ -182,56 +157,36 @@ impl super::Runtime for MicroW8 {
             start_time: Instant::now(),
             watchdog,
             sound_tx,
-        }))?;
+        });
         self.stream = stream;
         self.module_data = Some(module_data.into());
         Ok(())
     }
 
     fn run_frame(&mut self) -> Result<()> {
-        if let Ok(event) = self.rx.try_recv() {
-            match event {
-                UIEvent::Error(err) => err,
-                UIEvent::Reset => {
+        let input = self.window.begin_frame();
+
+        if input.reset {
             if let Some(module_data) = self.module_data.take() {
-                        self.load(&module_data)
-                    } else {
-                        Ok(())
+                self.load(&module_data)?;
             }
         }
-            }
-        } else {
-            Ok(())
-        }
-    }
-}
 
-struct State {
-    instance: Option<UW8Instance>,
-    timeout: u32,
-}
-
-impl State {
-    fn run_frame(
-        &mut self,
-        framebuffer: &mut dyn uw8_window::Framebuffer,
-        gamepad: u32,
-    ) -> Result<Instant> {
         let now = Instant::now();
-        let mut result = Ok(now);
+        let mut result = Ok(());
         if let Some(mut instance) = self.instance.take() {
             let time = (now - instance.start_time).as_millis() as i32;
-            {
+            let next_frame = {
                 let offset = ((time as u32 as i64 * 6) % 100 - 50) / 6;
                 let max = now + Duration::from_millis(17);
                 let next_center = now + Duration::from_millis((16 - offset) as u64);
-                result = Ok(next_center.min(max));
-            }
+                next_center.min(max)
+            };
 
             {
                 let mem = instance.memory.data_mut(&mut instance.store);
                 mem[64..68].copy_from_slice(&time.to_le_bytes());
-                mem[68..72].copy_from_slice(&gamepad.to_le_bytes());
+                mem[68..72].copy_from_slice(&input.gamepads);
             }
 
             instance.store.set_epoch_deadline(self.timeout as u64);
@@ -255,14 +210,16 @@ impl State {
 
             let framebuffer_mem = &memory[120..(120 + 320 * 240)];
             let palette_mem = &memory[0x13000..];
-            framebuffer.update(framebuffer_mem, palette_mem);
+            self.window
+                .end_frame(framebuffer_mem, palette_mem, next_frame);
 
             if result.is_ok() {
                 self.instance = Some(instance);
             }
         }
 
-        Ok(result?)
+        result?;
+        Ok(())
     }
 }
 

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",

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" ] }

uw8-window/src/cpu.rs

@@ -1,7 +1,8 @@
 use std::time::Instant;
 
-use crate::Framebuffer;
-use minifb::{Key, Window, WindowOptions};
+use crate::{Input, WindowImpl};
+use anyhow::Result;
+use minifb::{Key, WindowOptions};
 
 static GAMEPAD_KEYS: &[Key] = &[
     Key::Up,
@@ -14,13 +15,19 @@ static GAMEPAD_KEYS: &[Key] = &[
     Key::S,
 ];
 
-pub fn run(mut update: Box<dyn FnMut(&mut dyn Framebuffer, u32, bool) -> Instant + 'static>) -> ! {
+pub struct Window {
+    window: minifb::Window,
+    buffer: Vec<u32>,
+}
+
+impl Window {
+    pub fn new() -> Result<Window> {
         #[cfg(target_os = "windows")]
         unsafe {
             winapi::um::timeapi::timeBeginPeriod(1);
         }
 
-    let mut buffer: Vec<u32> = vec![0; 320 * 240];
+        let buffer: Vec<u32> = vec![0; 320 * 240];
 
         let options = WindowOptions {
             scale: minifb::Scale::X2,
@@ -28,44 +35,33 @@ pub fn run(mut update: Box<dyn FnMut(&mut dyn Framebuffer, u32, bool) -> Instant
             resize: true,
             ..Default::default()
         };
-    let mut window = Window::new("MicroW8", 320, 240, options).unwrap();
+        let window = minifb::Window::new("MicroW8", 320, 240, options).unwrap();
 
-    let mut next_frame = Instant::now();
-    while window.is_open() && !window.is_key_down(Key::Escape) {
-        if let Some(sleep) = next_frame.checked_duration_since(Instant::now()) {
-            std::thread::sleep(sleep);
+        Ok(Window { window, buffer })
     }
+}
 
-        let mut gamepad = 0;
-        for key in window.get_keys() {
+impl WindowImpl for Window {
+    fn begin_frame(&mut self) -> Input {
+        let mut gamepads = [0u8; 4];
+        for key in self.window.get_keys() {
             if let Some(index) = GAMEPAD_KEYS
                 .iter()
                 .enumerate()
                 .find(|(_, &k)| k == key)
                 .map(|(i, _)| i)
             {
-                gamepad |= 1 << index;
+                gamepads[0] |= 1 << index;
             }
         }
 
-        next_frame = update(
-            &mut CpuFramebuffer {
-                buffer: &mut buffer,
-            },
-            gamepad,
-            window.is_key_pressed(Key::R, minifb::KeyRepeat::No),
-        );
-        window.update_with_buffer(&buffer, 320, 240).unwrap();
+        Input {
+            gamepads,
+            reset: self.window.is_key_pressed(Key::R, minifb::KeyRepeat::No),
+        }
     }
-    std::process::exit(0);
-}
 
-struct CpuFramebuffer<'a> {
-    buffer: &'a mut Vec<u32>,
-}
-
-impl<'a> Framebuffer for CpuFramebuffer<'a> {
-    fn update(&mut self, framebuffer: &[u8], palette: &[u8]) {
+    fn end_frame(&mut self, framebuffer: &[u8], palette: &[u8], next_frame: Instant) {
         for (i, &color_index) in framebuffer.iter().enumerate() {
             let offset = color_index as usize * 4;
             self.buffer[i] = 0xff000000
@@ -73,5 +69,15 @@ impl<'a> Framebuffer for CpuFramebuffer<'a> {
                 | ((palette[offset + 1] as u32) << 8)
                 | palette[offset + 2] as u32;
         }
+        self.window
+            .update_with_buffer(&self.buffer, 320, 240)
+            .unwrap();
+        if let Some(sleep) = next_frame.checked_duration_since(Instant::now()) {
+            std::thread::sleep(sleep);
+        }
+    }
+
+    fn is_open(&self) -> bool {
+        self.window.is_open() && !self.window.is_key_down(Key::Escape)
     }
 }

uw8-window/src/gpu/crt.rs

@@ -112,7 +112,7 @@ impl CrtFilter {
 }
 
 impl Filter for CrtFilter {
-    fn resize(&self, queue: &wgpu::Queue, new_size: PhysicalSize<u32>) {
+    fn resize(&mut self, queue: &wgpu::Queue, new_size: PhysicalSize<u32>) {
         let uniforms = Uniforms {
             texture_scale: texture_scale_from_resolution(new_size),
         };

uw8-window/src/gpu/fast_crt.rs

@@ -15,6 +15,7 @@ impl FastCrtFilter {
         screen: &wgpu::TextureView,
         resolution: PhysicalSize<u32>,
         surface_format: wgpu::TextureFormat,
+        chromatic: bool,
     ) -> FastCrtFilter {
         let uniforms = Uniforms {
             texture_scale: texture_scale_from_resolution(resolution),
@@ -104,7 +105,11 @@ impl FastCrtFilter {
             },
             fragment: Some(wgpu::FragmentState {
                 module: &shader,
-                entry_point: "fs_main",
+                entry_point: if chromatic {
+                    "fs_main_chromatic"
+                } else {
+                    "fs_main"
+                },
                 targets: &[Some(wgpu::ColorTargetState {
                     format: surface_format,
                     blend: None,
@@ -126,7 +131,7 @@ impl FastCrtFilter {
 }
 
 impl Filter for FastCrtFilter {
-    fn resize(&self, queue: &wgpu::Queue, new_size: PhysicalSize<u32>) {
+    fn resize(&mut self, queue: &wgpu::Queue, new_size: PhysicalSize<u32>) {
         let uniforms = Uniforms {
             texture_scale: texture_scale_from_resolution(new_size),
         };

uw8-window/src/gpu/fast_crt.wgsl

@@ -34,10 +34,9 @@ fn col_factor(offset: f32) -> f32 {
     return 1.0 / (1.0 + offset * offset * 16.0);
 }
 
-@fragment
-fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
-    let base = round(in.tex_coords) - vec2<f32>(0.5);
-    let frac = in.tex_coords - base;
+fn sample_screen(tex_coords: vec2<f32>) -> vec4<f32> {
+    let base = round(tex_coords) - vec2<f32>(0.5);
+    let frac = tex_coords - base;
     
     let top_factor = row_factor(frac.y);
     let bottom_factor = row_factor(frac.y - 1.0);
@@ -52,3 +51,16 @@ fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
     return textureSample(screen_texture, linear_sampler, vec2<f32>(u, v) / vec2<f32>(320.0, 240.0)) * (top_factor + bottom_factor) * (left_factor + right_factor) * 1.1;
 }
 
+@fragment
+fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
+    return sample_screen(in.tex_coords);
+}
+
+@fragment
+fn fs_main_chromatic(in: VertexOutput) -> @location(0) vec4<f32> {
+    let r = sample_screen(in.tex_coords + vec2<f32>(0.2, 0.2)).r;
+    let g = sample_screen(in.tex_coords + vec2<f32>(0.07, -0.27)).g;
+    let b = sample_screen(in.tex_coords + vec2<f32>(-0.27, 0.07)).b;
+    return vec4<f32>(r, g, b, 1.0);
+}
+

uw8-window/src/gpu/mod.rs

@@ -1,4 +1,4 @@
-use crate::Framebuffer;
+use crate::{Input, WindowConfig, WindowImpl};
 use anyhow::{anyhow, Result};
 use std::{num::NonZeroU32, time::Instant};
 
@@ -9,12 +9,7 @@ use winit::{
     window::{Fullscreen, WindowBuilder},
 };
 
-#[cfg(target_os = "macos")]
-use winit::platform::macos::EventLoopExtMacOS;
-#[cfg(target_os = "linux")]
-use winit::platform::unix::EventLoopExtUnix;
-#[cfg(target_os = "windows")]
-use winit::platform::windows::EventLoopExtWindows;
+use winit::platform::run_return::EventLoopExtRunReturn;
 
 mod crt;
 mod fast_crt;
@@ -25,23 +20,35 @@ use fast_crt::FastCrtFilter;
 use square::SquareFilter;
 
 pub struct Window {
-    event_loop: EventLoop<()>,
-    window: winit::window::Window,
-    instance: wgpu::Instance,
+    _instance: wgpu::Instance,
     surface: wgpu::Surface,
-    adapter: wgpu::Adapter,
+    _adapter: wgpu::Adapter,
     device: wgpu::Device,
     queue: wgpu::Queue,
+    palette_screen_mode: PaletteScreenMode,
+    surface_config: wgpu::SurfaceConfiguration,
+    filter: Box<dyn Filter>,
+    event_loop: EventLoop<()>,
+    window: winit::window::Window,
+    gamepads: [u8; 4],
+    next_frame: Instant,
+    is_fullscreen: bool,
+    is_open: bool,
 }
 
 impl Window {
-    pub fn new() -> Result<Window> {
-        async fn create() -> Result<Window> {
-            let event_loop = EventLoop::new_any_thread();
+    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);
@@ -61,37 +68,9 @@ impl Window {
                 .request_device(&wgpu::DeviceDescriptor::default(), None)
                 .await?;
 
-            Ok(Window {
-                event_loop,
-                window,
-                instance,
-                surface,
-                adapter,
-                device,
-                queue,
-            })
-        }
-
-        pollster::block_on(create())
-    }
-
-    pub fn run(
-        self,
-        mut update: Box<dyn FnMut(&mut dyn Framebuffer, u32, bool) -> Instant + 'static>,
-    ) -> ! {
-        let Window {
-            event_loop,
-            window,
-            instance,
-            surface,
-            adapter,
-            device,
-            queue,
-        } = self;
-
             let palette_screen_mode = PaletteScreenMode::new(&device);
 
-        let mut surface_config = wgpu::SurfaceConfiguration {
+            let surface_config = wgpu::SurfaceConfiguration {
                 usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
                 format: surface.get_supported_formats(&adapter)[0],
                 width: window.inner_size().width,
@@ -99,32 +78,58 @@ impl Window {
                 present_mode: wgpu::PresentMode::AutoNoVsync,
             };
 
-        let mut filter: Box<dyn Filter> = Box::new(CrtFilter::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);
 
+            Ok(Window {
+                event_loop,
+                window,
+                _instance: instance,
+                surface,
+                _adapter: adapter,
+                device,
+                queue,
+                palette_screen_mode,
+                surface_config,
+                filter,
+                gamepads: [0; 4],
+                next_frame: Instant::now(),
+                is_fullscreen: window_config.fullscreen,
+                is_open: true,
+            })
+        }
+
+        pollster::block_on(create(window_config))
+    }
+}
+
+impl WindowImpl for Window {
+    fn begin_frame(&mut self) -> Input {
         let mut reset = false;
-        let mut gamepad = 0;
-
-        event_loop.run(move |event, _, control_flow| {
-            let _ = (&window, &instance, &surface, &adapter, &device);
-
+        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) => {
-                        surface_config.width = new_size.width;
-                        surface_config.height = new_size.height;
-                        surface.configure(&device, &surface_config);
-                        filter.resize(&queue, new_size);
+                        self.surface_config.width = new_size.width;
+                        self.surface_config.height = new_size.height;
+                        self.surface.configure(&self.device, &self.surface_config);
+                        self.filter.resize(&self.queue, new_size);
+                    }
+                    WindowEvent::CloseRequested => {
+                        self.is_open = false;
+                        *control_flow = ControlFlow::Exit;
                     }
-                    WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
                     WindowEvent::KeyboardInput { input, .. } => {
-                        fn gamepad_button(input: &winit::event::KeyboardInput) -> u32 {
+                        fn gamepad_button(input: &winit::event::KeyboardInput) -> u8 {
                             match input.scancode {
                                 44 => 16,
                                 45 => 32,
@@ -141,78 +146,79 @@ impl Window {
                         }
                         if input.state == winit::event::ElementState::Pressed {
                             match input.virtual_keycode {
-                                Some(VirtualKeyCode::Escape) => *control_flow = ControlFlow::Exit,
+                                Some(VirtualKeyCode::Escape) => {
+                                    self.is_open = false;
+                                    *control_flow = ControlFlow::Exit;
+                                }
                                 Some(VirtualKeyCode::F) => {
-                                    window.set_fullscreen(if window.fullscreen().is_some() {
+                                    let fullscreen = if self.window.fullscreen().is_some() {
                                         None
                                     } else {
                                         Some(Fullscreen::Borderless(None))
-                                    });
+                                    };
+                                    self.is_fullscreen = fullscreen.is_some();
+                                    self.window.set_fullscreen(fullscreen);
                                 }
                                 Some(VirtualKeyCode::R) => reset = true,
-                                Some(VirtualKeyCode::Key1) => {
-                                    filter = Box::new(SquareFilter::new(
-                                        &device,
-                                        &palette_screen_mode.screen_view,
-                                        window.inner_size(),
-                                        surface_config.format,
-                                    ))
-                                }
-                                Some(VirtualKeyCode::Key2) => {
-                                    filter = Box::new(FastCrtFilter::new(
-                                        &device,
-                                        &palette_screen_mode.screen_view,
-                                        window.inner_size(),
-                                        surface_config.format,
-                                    ))
-                                }
-                                Some(VirtualKeyCode::Key3) => {
-                                    filter = Box::new(CrtFilter::new(
-                                        &device,
-                                        &palette_screen_mode.screen_view,
-                                        window.inner_size(),
-                                        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),
                                 _ => (),
                             }
 
-                            gamepad |= gamepad_button(&input);
+                            self.gamepads[0] |= gamepad_button(&input);
                         } else {
-                            gamepad &= !gamepad_button(&input);
+                            self.gamepads[0] &= !gamepad_button(&input);
                         }
                     }
                     _ => (),
                 },
-                Event::MainEventsCleared => {
-                    if let ControlFlow::WaitUntil(t) = *control_flow {
-                        if Instant::now() < t {
-                            return;
+                Event::RedrawEventsCleared => {
+                    if Instant::now() >= self.next_frame
+                        // workaround needed on Wayland until the next winit release
+                        && self.window.fullscreen().is_some() == self.is_fullscreen
+                    {
+                        *control_flow = ControlFlow::Exit
                     }
                 }
-                    let next_frame = update(
-                        &mut GpuFramebuffer {
-                            queue: &queue,
-                            framebuffer: &palette_screen_mode,
-                        },
-                        gamepad,
-                        reset,
+                _ => (),
+            }
+            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,
                 );
-                    reset = false;
-                    *control_flow = ControlFlow::WaitUntil(next_frame);
+            }
+        });
+        Input {
+            gamepads: self.gamepads,
+            reset,
+        }
+    }
 
-                    let output = surface.get_current_texture().unwrap();
+    fn end_frame(&mut self, framebuffer: &[u8], palette: &[u8], next_frame: Instant) {
+        self.next_frame = next_frame;
+        self.palette_screen_mode
+            .write_framebuffer(&self.queue, framebuffer);
+        self.palette_screen_mode.write_palette(&self.queue, palette);
+
+        let output = self.surface.get_current_texture().unwrap();
         let view = output
             .texture
             .create_view(&wgpu::TextureViewDescriptor::default());
-                    let mut encoder = device
+        let mut encoder = self
+            .device
             .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
 
-                    palette_screen_mode.resolve_screen(&mut encoder);
+        self.palette_screen_mode.resolve_screen(&mut encoder);
 
         {
-                        let mut render_pass =
-                            encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+            let mut render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
                 label: None,
                 color_attachments: &[Some(wgpu::RenderPassColorAttachment {
                     view: &view,
@@ -230,35 +236,105 @@ impl Window {
                 depth_stencil_attachment: None,
             });
 
-                        filter.render(&mut render_pass);
+            self.filter.render(&mut render_pass);
         }
 
-                    queue.submit(std::iter::once(encoder.finish()));
+        self.queue.submit(std::iter::once(encoder.finish()));
         output.present();
     }
-                _ => (),
-            }
-        });
+
+    fn is_open(&self) -> bool {
+        self.is_open
     }
 }
 
-struct GpuFramebuffer<'a> {
-    framebuffer: &'a PaletteScreenMode,
-    queue: &'a wgpu::Queue,
-}
-
-impl<'a> Framebuffer for GpuFramebuffer<'a> {
-    fn update(&mut self, pixels: &[u8], palette: &[u8]) {
-        self.framebuffer.write_framebuffer(self.queue, pixels);
-        self.framebuffer.write_palette(self.queue, palette);
+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(&self, queue: &wgpu::Queue, new_size: PhysicalSize<u32>);
+    fn resize(&mut self, queue: &wgpu::Queue, new_size: PhysicalSize<u32>);
     fn render<'a>(&'a self, render_pass: &mut wgpu::RenderPass<'a>);
 }
 
+struct AutoCrtFilter {
+    small: CrtFilter,
+    large: FastCrtFilter,
+    resolution: PhysicalSize<u32>,
+}
+
+impl AutoCrtFilter {
+    fn new(
+        device: &wgpu::Device,
+        screen: &wgpu::TextureView,
+        resolution: PhysicalSize<u32>,
+        surface_format: wgpu::TextureFormat,
+    ) -> AutoCrtFilter {
+        let small = CrtFilter::new(device, screen, resolution, surface_format);
+        let large = FastCrtFilter::new(device, screen, resolution, surface_format, true);
+        AutoCrtFilter {
+            small,
+            large,
+            resolution,
+        }
+    }
+}
+
+impl Filter for AutoCrtFilter {
+    fn resize(&mut self, queue: &wgpu::Queue, new_size: PhysicalSize<u32>) {
+        self.small.resize(queue, new_size);
+        self.large.resize(queue, new_size);
+        self.resolution = new_size;
+    }
+
+    fn render<'a>(&'a self, render_pass: &mut wgpu::RenderPass<'a>) {
+        if self.resolution.width < 960 || self.resolution.height < 720 {
+            self.small.render(render_pass);
+        } else {
+            self.large.render(render_pass);
+        }
+    }
+}
+
 struct PaletteScreenMode {
     framebuffer: wgpu::Texture,
     palette: wgpu::Texture,

uw8-window/src/gpu/square.rs

@@ -126,7 +126,7 @@ impl SquareFilter {
 }
 
 impl Filter for SquareFilter {
-    fn resize(&self, queue: &wgpu::Queue, new_size: PhysicalSize<u32>) {
+    fn resize(&mut self, queue: &wgpu::Queue, new_size: PhysicalSize<u32>) {
         let uniforms = Uniforms {
             texture_scale: texture_scale_from_resolution(new_size),
         };

uw8-window/src/lib.rs

@@ -1,24 +1,81 @@
+use anyhow::Result;
 use std::time::Instant;
 
 mod cpu;
 mod gpu;
 
-pub fn run<F: 'static + FnMut(&mut dyn Framebuffer, u32, bool) -> Instant>(
-    gpu: bool,
-    update: F,
-) -> ! {
-    if gpu {
-        match gpu::Window::new() {
-            Ok(window) => window.run(Box::new(update)),
+pub struct Window(Box<dyn WindowImpl>);
+
+impl Window {
+    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 to cpu window",
+                    "Failed to create gpu window: {}\nFalling back tp cpu window",
                     err
                 ),
             }
         }
-    cpu::run(Box::new(update));
+        cpu::Window::new().map(|window| Window(Box::new(window)))
+    }
+
+    pub fn begin_frame(&mut self) -> Input {
+        self.0.begin_frame()
+    }
+    pub fn end_frame(&mut self, framebuffer: &[u8], palette: &[u8], next_frame: Instant) {
+        self.0.end_frame(framebuffer, palette, next_frame)
+    }
+
+    pub fn is_open(&self) -> bool {
+        self.0.is_open()
+    }
 }
 
-pub trait Framebuffer {
-    fn update(&mut self, pixels: &[u8], palette: &[u8]);
+#[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,
+}
+
+trait WindowImpl {
+    fn begin_frame(&mut self) -> Input;
+    fn end_frame(&mut self, framebuffer: &[u8], palette: &[u8], next_frame: Instant);
+    fn is_open(&self) -> bool;
 }

uw8-window/src/main.rs

@@ -1,10 +1,13 @@
 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 start_time = Instant::now();
+    let mut start_time = Instant::now();
 
     let mut palette = vec![0u32; 256];
     for i in 0..256 {
@@ -18,11 +21,19 @@ fn main() {
     let mut fps_start = Instant::now();
     let mut fps_counter = 0;
 
-    uw8_window::run(true, move |gpu_framebuffer, _gamepads, _reset| {
-        for _ in 0..1 {
-            draw_frame(&mut framebuffer, start_time.elapsed().as_secs_f32());
+    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();
+        if input.reset {
+            start_time = Instant::now();
         }
-        gpu_framebuffer.update(&framebuffer, bytemuck::cast_slice(&palette));
+        draw_frame(&mut framebuffer, start_time.elapsed().as_secs_f32());
+        window.end_frame(&framebuffer, bytemuck::cast_slice(&palette), Instant::now());
+
         fps_counter += 1;
         let elapsed = fps_start.elapsed().as_secs_f32();
         if elapsed >= 1.0 {
@@ -30,8 +41,7 @@ fn main() {
             fps_start = Instant::now();
             fps_counter = 0;
         }
-        Instant::now()
-    });
+    }
 }
 
 fn draw_frame(framebuffer: &mut [u8], time: f32) {