add some command line switches for the gpu window

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,