Add Sdl rendering, Add keyboard input

README.md

@@ -1,6 +1,6 @@
 # chip8-rs
 
 CHIP-8 emulator written in Rust.
-(Done from the Go implementation: https://github.com/arnaucube/go-chip8)
+(Done with the Go implementation: https://github.com/arnaucube/go-chip8)
 
 https://en.wikipedia.org/wiki/CHIP-8

chip8/src/lib.rs

@@ -16,7 +16,7 @@ pub struct Chip8 {
     sound_timer: u8,
     stack: [u16; 16],
     sp: isize,
-    key: [u8; 16],
+    pub key: [u8; 16],
     pub draw_flag: bool,
 }
 
@@ -71,12 +71,13 @@ impl Chip8 {
         }
     }
     pub fn emulate_cycle(&mut self) {
-        self.opcode = (self.memory[self.pc as usize] as u16) << 8
-            | self.memory[(self.pc + 1) as usize] as u16;
+        self.opcode = ((self.memory[self.pc as usize] as u16) << 8)
+            | (self.memory[(self.pc + 1) as usize] as u16);
         let x: usize = ((self.opcode & 0x0F00) >> 8) as usize;
         let y: usize = ((self.opcode & 0x00F0) >> 4) as usize;
         let nn: u8 = (self.opcode & 0x00FF) as u8;
         let nnn: u16 = (self.opcode & 0x0FFF) as u16;
+        // println!("{:?} {:?}", self.opcode, self.pc);
 
         // Decode Opcode
         // https://en.wikipedia.org/wiki/CHIP-8#Opcode_table
@@ -275,7 +276,7 @@ impl Chip8 {
                             if self.gfx[pos] == 1 {
                                 self.v[0xF] = 1;
                             } else {
-                                self.v[0xF] ^= 1;
+                                self.gfx[pos] ^= 1;
                             }
                         }
                     }
@@ -367,7 +368,7 @@ impl Chip8 {
                         }
                         self.pc += 2;
                     }
-                    0x0064 => {
+                    0x0065 => {
                         // 0xFX65 Fills V0 to VX (including VX) with values
                         // from memory starting at address I. The offset from I
                         // is increased by 1 for each value written, but I
@@ -382,6 +383,15 @@ impl Chip8 {
             }
             _ => println!("opc {:x}", self.opcode),
         }
+        if self.delay_timer > 0 {
+            self.delay_timer -= 1;
+        }
+        if self.sound_timer > 0 {
+            if self.sound_timer == 1 {
+                println!("Beep");
+            }
+            self.sound_timer -= 1;
+        }
     }
 }
 

src/main.rs

@@ -1,6 +1,11 @@
+use std::collections::HashMap;
+use std::{thread, time};
 extern crate sdl2;
 
+use sdl2::event::Event;
+use sdl2::keyboard::Keycode;
 use sdl2::pixels::Color;
+use sdl2::rect::Rect;
 use sdl2::render::Canvas;
 
 use clap::{App, Arg};
@@ -11,7 +16,9 @@ struct SdlEmulator {
     w: usize,
     h: usize,
     zoom: usize,
+    sdl_context: sdl2::Sdl,
     canvas: Canvas<sdl2::video::Window>,
+    vkeys: HashMap<Keycode, u8>,
     chip8: Chip8,
 }
 
@@ -23,26 +30,97 @@ impl SdlEmulator {
         let video_subsystem = sdl_context.video().unwrap();
 
         let window = video_subsystem
-            .window("rust-sdl2 demo", 800, 600)
+            .window("rust-sdl2 demo", (w * zoom) as u32, (h * zoom) as u32)
             .position_centered()
             .build()
             .unwrap();
 
         let mut canvas = window.into_canvas().build().unwrap();
 
+        let mut vkeys: HashMap<Keycode, u8> = HashMap::new();
+        vkeys.insert(Keycode::Num1, 0x01);
+        vkeys.insert(Keycode::Num2, 0x02);
+        vkeys.insert(Keycode::Num3, 0x03);
+        vkeys.insert(Keycode::Num4, 0x0c);
+        vkeys.insert(Keycode::Q, 0x04);
+        vkeys.insert(Keycode::W, 0x05);
+        vkeys.insert(Keycode::E, 0x06);
+        vkeys.insert(Keycode::R, 0x07);
+        vkeys.insert(Keycode::A, 0x08);
+        vkeys.insert(Keycode::S, 0x09);
+        vkeys.insert(Keycode::D, 0x0E);
+        vkeys.insert(Keycode::F, 0x0A);
+        vkeys.insert(Keycode::Z, 0x00);
+        vkeys.insert(Keycode::X, 0x0B);
+        vkeys.insert(Keycode::V, 0x0F);
+
         SdlEmulator {
             w,
             h,
             zoom,
+            sdl_context,
             canvas,
+            vkeys,
             chip8: c,
         }
     }
     fn draw_graphics(&mut self) {
-        // TODO
+        self.canvas.set_draw_color(Color::RGB(0, 0, 0));
+        self.canvas.clear();
+        self.canvas.set_draw_color(Color::RGB(255, 255, 255));
+        for y in 0..self.h {
+            for x in 0..self.w {
+                let pixel = self.chip8.gfx[y * self.w + x];
+                if pixel != 0 {
+                    self.canvas.fill_rect(Rect::new(
+                        (x * self.zoom) as i32,
+                        (y * self.zoom) as i32,
+                        (self.zoom) as u32,
+                        (self.zoom) as u32,
+                    ));
                 }
-    fn set_keys(&mut self) {
-        // TODO
+            }
+        }
+
+        self.canvas.present();
+        self.chip8.draw_flag = false;
+    }
+    fn set_keys(&mut self) -> Result<(), String> {
+        let mut events = self.sdl_context.event_pump()?;
+        for event in events.poll_iter() {
+            match event {
+                Event::Quit { .. } => {
+                    println!("Quit");
+                    std::process::exit(0);
+                }
+                Event::KeyDown {
+                    keycode: Some(keycode),
+                    ..
+                } => {
+                    println!("k {:?}", keycode);
+                    if self.vkeys.contains_key(&keycode) {
+                        let k_hex = self.vkeys.get(&keycode).unwrap();
+                        self.chip8.key[*k_hex as usize] = 1;
+                    }
+                }
+                Event::KeyUp {
+                    keycode: Some(keycode),
+                    ..
+                } => {
+                    println!("k {:?}", keycode);
+                    if self.vkeys.contains_key(&keycode) {
+                        let k_hex = self.vkeys.get(&keycode).unwrap();
+                        self.chip8.key[*k_hex as usize] = 0;
+                    }
+                    if keycode == Keycode::Escape {
+                        println!("EXIT");
+                        std::process::exit(0);
+                    }
+                }
+                _ => {}
+            }
+        }
+        Ok(())
     }
 }
 
@@ -66,12 +144,14 @@ fn main() {
     println!("{:?}", file);
 
     let mut e = SdlEmulator::new(64, 32, 8);
+    e.chip8.load_game(file);
+
     loop {
         e.chip8.emulate_cycle();
         if e.chip8.draw_flag {
             e.draw_graphics();
         }
         e.set_keys();
-        // delay
+        std::thread::sleep(time::Duration::from_millis(1000 / 60));
     }
 }