Re-add simple, cross-platform UI

Cargo.lock

@@ -185,7 +185,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "sdl-frontend"
+name = "sdl-ui"
 version = "0.1.0"
 dependencies = [
  "nes",
@@ -307,7 +307,7 @@ dependencies = [
  "native-windows-gui",
  "nes",
  "rand",
- "sdl-frontend",
+ "sdl-ui",
  "sdl2",
  "sdl2-sys",
 ]

Cargo.toml

@@ -5,7 +5,7 @@ members = [
     "ppu",
     "apu",
     "memory",
-    "sdl-frontend",
+    "sdl-ui",
     "windows-ui",
 ]
 

sdl-ui/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "sdl-frontend"
+name = "sdl-ui"
 version = "0.1.0"
 authors = ["Henry Sloan <henryksloan@gmail.com>"]
 edition = "2018"

sdl-ui/src/lib.rs

@@ -24,13 +24,13 @@ const COLORS: &'static [i32] = &[
     0x000000,
 ];
 
-pub struct SDLFrontend {
+pub struct SDLUI {
     sdl_context: Sdl,
     canvas: WindowCanvas,
     nes: Rc<RefCell<NES>>,
 }
 
-impl SDLFrontend {
+impl SDLUI {
     pub fn new(sdl_context: Sdl, window: Window, nes: Rc<RefCell<NES>>) -> Self {
         Self {
             sdl_context,

sdl-ui/src/main.rs

@@ -0,0 +1,38 @@
+use nes::NES;
+
+use std::cell::RefCell;
+use std::env;
+use std::fs::File;
+use std::process;
+use std::rc::Rc;
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    if args.len() < 2 {
+        eprintln!("usage: {} <NES ROM file>", args[0]);
+        process::exit(1);
+    }
+
+    let file = File::open(&args[1]).unwrap_or_else(|err| {
+        println!("failed to read file: {}", err);
+        process::exit(1);
+    });
+
+    let mut nes = Rc::new(RefCell::new(NES::new()));
+    nes.borrow_mut().load_rom(file).unwrap_or_else(|err| {
+        println!("failed to load ROM: {}", err);
+        process::exit(1);
+    });
+
+    let sdl_context = sdl2::init().unwrap();
+    let video_subsystem = sdl_context.video().unwrap();
+
+    let window = video_subsystem
+        .window("KindNES", (256.0 * 3.0) as u32, (240.0 * 3.0) as u32)
+        .position_centered()
+        .build()
+        .unwrap();
+
+    let mut sdl_ui = sdl_ui::SDLUI::new(sdl_context, window, nes);
+    sdl_ui.render_loop();
+}

windows-ui/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2018"
 nes = { path = "../nes" }
 cpu = { path = "../cpu" }
 memory = { path = "../memory" }
-sdl-frontend = { path = "../sdl-frontend" }
+sdl-ui = { path = "../sdl-ui" }
 sdl2 = "0.34.3"
 sdl2-sys = "0.34.3"
 rand = "0.8.3"

windows-ui/src/main.rs

@@ -1,7 +1,7 @@
 #![windows_subsystem = "windows"]
 
 use nes::NES;
-use sdl_frontend::SDLFrontend;
+use sdl_ui::SDLUI;
 
 use core::ffi::c_void;
 use std::cell::RefCell;
@@ -107,6 +107,6 @@ fn main() {
         SDL_Window::from_ll(video_subsystem, window_raw)
     };
 
-    let mut sdl_frontend = SDLFrontend::new(sdl_context, window, app.nes.clone());
-    sdl_frontend.render_loop();
+    let mut sdl_ui = SDLUI::new(sdl_context, window, app.nes.clone());
+    sdl_ui.render_loop();
 }