update: change graphics and rom load

ROM load by argument

Graphics are manage by main and not machine

src/machine.rs

@@ -41,13 +41,9 @@ pub const WIDTH: usize = 64;
 extern crate sdl2;
 extern crate rand;
 
-pub use sdl2::pixels::Color;
 pub use sdl2::event::Event;
 pub use sdl2::EventPump;
 pub use sdl2::keyboard::Keycode;
-pub use sdl2::video::Window;
-pub use sdl2::rect::Point;
-pub use sdl2::render::Canvas;
 
 pub use std::fs::File;
 pub use std::path::Path;
@@ -91,9 +87,10 @@ impl Machine {
     }
 
     /// charge une ROM en mémoire
-    pub fn load_rom(&mut self, p: &Path) -> io::Result<()> {
+    //pub fn load_rom(&mut self, p: &Path) -> Result<String, io::Error> {
-        let mut buffer = Vec::new();
+    pub fn load_rom(&mut self, p: &Path) -> Result<(), io::Error> {
         let mut f = File::open(p)?;
+        let mut buffer = Vec::new();
         f.read_to_end(&mut buffer)?;
 
         for i in 0..buffer.len() {
@@ -101,9 +98,10 @@ impl Machine {
         }
 
         Ok(())
+        //Ok(String::from(p.to_str().unwrap()))
     }
 
-    pub fn cycle(&mut self, screen: &mut Canvas<Window>, events: &mut EventPump) {
+    pub fn cycle(&mut self, events: &mut EventPump) {
         let opcode = ((self.memory[self.pc] as u16) << 8) 
             + (self.memory[self.pc + 1] as u16);
 
@@ -126,12 +124,7 @@ impl Machine {
 
         match (opcode & 0xf000) >> 12 {
             0 => match opcode {
-                0x00E0 => {
+                0x00E0 => self.display_buffer = [[0; 64]; 32],
-                    self.display_buffer = [[0; 64]; 32];
-                    screen.set_draw_color(Color::RGB(0, 0, 0));
-                    screen.clear();
-                    screen.present();
-                },
                 0x00EE => self.pc = self.stack.pop().unwrap() as usize,
                 _ => println!("SYS"),
             }
@@ -140,10 +133,10 @@ impl Machine {
                 self.stack.push(self.pc as u16); 
                 self.pc = (opcode & 0x0fff) as usize
             },
-            3 => if self.gpio[vx] == k as u8 {
+            3 => if self.gpio[vx] == k {
                 self.pc += 2;
             },
-            4 => if self.gpio[vx] != k as u8 {
+            4 => if self.gpio[vx] != k {
                 self.pc += 2;
             },
             5 => if self.gpio[vx] == self.gpio[vy] {
@@ -158,45 +151,37 @@ impl Machine {
                     2 => self.gpio[vx] &= self.gpio[vy],
                     3 => self.gpio[vx] ^= self.gpio[vy],
                     4 => {
+                        /*
+                        let tx = self.gpio[vx] as u16;
+                        let ty = self.gpio[vy] as u16;
+                        let result = tx + ty;
+                        self.gpio[vx] = result;
+                        self
+                        */
                         self.gpio[vx] = self.gpio[vx].saturating_add(self.gpio[vy]);
                         let (_, overflow) = self.gpio[vx].overflowing_add(self.gpio[vy]);
-                        if overflow {
+                        self.gpio[0x0f] = if overflow { 1 } else { 0 };
-                            self.gpio[0xf] = 1;
-                        }
                     },
                     5 => {
-                        if self.gpio[vx] > self.gpio[vy] {
+                        self.gpio[0x0f] = if self.gpio[vx] > self.gpio[vy] { 1 } else { 0 };
-                            self.gpio[0xf] = 1;
-                        } else {
-                            self.gpio[0xf] = 0;
-                        }
 
-                        let (t, _) = self.gpio[vx].overflowing_sub(self.gpio[vy]);
+                        //let (t, _) = self.gpio[vx].overflowing_sub(self.gpio[vy]);
-                        self.gpio[vx] = t;
+                        //self.gpio[vx] = t;
+                        self.gpio[vx] = self.gpio[vx].wrapping_sub(self.gpio[vy]);
                     },
                     6 => {
-                        if self.gpio[vx].trailing_ones() > 0 {
+                        self.gpio[0x0f] = self.gpio[vx] & 0x01;
-                            self.gpio[0xf] = 1;
-                        } else {
-                            self.gpio[0xf] = 0;
-                        }
-
                         self.gpio[vx] >>= 1;
                     },
                     7 => {
-                        if self.gpio[vx] < self.gpio[vy] {
+                        self.gpio[0x0f] = if self.gpio[vx] < self.gpio[vy] { 1 } else { 0 };
-                            self.gpio[0xf] = 1;
+                        self.gpio[vx] = self.gpio[vy].wrapping_sub(self.gpio[vx]);
-                        } else {
-                            self.gpio[0xf] = 0;
-                        }
-
-                        self.gpio[vx] = self.gpio[vy] - self.gpio[vx];
                     },
                     0xE => {
                         if self.gpio[vx].leading_ones() > 0 {
-                            self.gpio[0xf] = 1;
+                            self.gpio[0x0f] = 1;
                         } else {
-                            self.gpio[0xf] = 0;
+                            self.gpio[0x0f] = 0;
                         }
 
                         self.gpio[vx] <<= 1;

src/main.rs

@@ -28,10 +28,8 @@ use machine::HEIGHT;
 use machine::WIDTH;
 use machine::Machine;
 
-use std::fs::File;
 use std::path::Path;
 use std::io;
-use std::io::Read;
 use std::env;
 
 fn main() {
@@ -40,11 +38,18 @@ fn main() {
     //return;
     let mut t: Machine = Machine::new();
     t.init();
-    t.load_rom(Path::new(name_file));
+    match t.load_rom(Path::new(name_file)) {
+        Ok(()) => println!("La ROM a correctement été chargée."),
+        Err(e) => match e.kind() {
+            std::io::ErrorKind::NotFound => panic!("Le fichier n'a pas été trouvé."),
+            _ => panic!("Erreur inconnue : {}", e),
+        }
+    }
 
     let sdl_context = sdl2::init().unwrap();
     let video_subsystem = sdl_context.video().unwrap();
     let window = video_subsystem.window("Chip8 Emulator", WIDTH as u32, HEIGHT as u32)
+    //let window = video_subsystem.window("Chip8 Emulator", 100 + 10 * WIDTH as u32, 10 * HEIGHT as u32)
         .position_centered()
         .build()
         .unwrap();
@@ -57,13 +62,15 @@ fn main() {
     let mut event_pump = sdl_context.event_pump().unwrap();
 
     'running: loop {
-        t.cycle(&mut canvas, &mut event_pump);
+        t.cycle(&mut event_pump);
         
-        canvas.set_draw_color(Color::RGB(255, 255, 255));
-
         for i in 0..t.display_buffer.len() {
             for j in 0..t.display_buffer[i].len() {
                 if t.display_buffer[i][j] == 1 {
+                    canvas.set_draw_color(Color::RGB(255, 255, 255));
+                    canvas.draw_point(Point::new(j as i32, i as i32)).unwrap();
+                } else {
+                    canvas.set_draw_color(Color::RGB(0, 0, 0));
                     canvas.draw_point(Point::new(j as i32, i as i32)).unwrap();
                 }
             }
@@ -178,6 +185,8 @@ fn main() {
     }
 }
 
+use std::fs::File;
+use std::io::Read;
 #[allow(dead_code, unused_variables)]
 fn read_file(p: &Path) -> io::Result<()> {
     let mut buffer = Vec::new();