Add main structure of Emulator & Chip8 crate

.gitignore

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+/target
+Cargo.lock

Cargo.toml

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+[package]
+name = "chip8-rs"
+version = "0.0.1"
+authors = ["arnaucube <root@arnaucube.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = "2.33.3"
+chip8 = {path="./chip8"}

README.md

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

chip8/.gitignore

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+/target
+Cargo.lock

chip8/Cargo.toml

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+[package]
+name = "chip8"
+version = "0.1.0"
+authors = ["arnaucube <root@arnaucube.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

chip8/src/lib.rs

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+use std::fs;
+use std::io::Read;
+
+const w: usize = 64;
+const h: usize = 32;
+
+pub struct Chip8 {
+    opcode: u16,
+    memory: [u8; 4096],
+    v: [u8; 16],
+    index: u16,
+    pc: u16,
+    gfx: [u8; w * h],
+    delay_timer: u8,
+    sound_timer: u8,
+    stack: [u16; 16],
+    sp: isize,
+    key: [u8; 16],
+    pub draw_flag: bool,
+}
+
+const font_set: [u8; 80] = [
+    0xF0, 0x90, 0x90, 0x90, 0xF0, // 0
+    0x20, 0x60, 0x20, 0x20, 0x70, // 1
+    0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2
+    0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3
+    0x90, 0x90, 0xF0, 0x10, 0x10, // 4
+    0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5
+    0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6
+    0xF0, 0x10, 0x20, 0x40, 0x40, // 7
+    0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8
+    0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9
+    0xF0, 0x90, 0xF0, 0x90, 0x90, // A
+    0xE0, 0x90, 0xE0, 0x90, 0xE0, // B
+    0xF0, 0x80, 0x80, 0x80, 0xF0, // C
+    0xE0, 0x90, 0x90, 0x90, 0xE0, // D
+    0xF0, 0x80, 0xF0, 0x80, 0xF0, // E
+    0xF0, 0x80, 0xF0, 0x80, 0x80, // F
+];
+
+impl Chip8 {
+    pub fn new() -> Chip8 {
+        let mut c = Chip8 {
+            opcode: 0,
+            memory: [0; 4096],
+            v: [0; 16],
+            index: 0,
+            pc: 0x200,
+            gfx: [0; w * h],
+            delay_timer: 0,
+            sound_timer: 0,
+            stack: [0; 16],
+            sp: 0,
+            key: [0; 16],
+            draw_flag: false,
+        };
+
+        for i in 0..font_set.len() {
+            c.memory[i] = font_set[i];
+        }
+        c
+    }
+    pub fn load_game(&mut self, filepath: &str) {
+        let mut f = fs::File::open(filepath).expect("can not load rom file");
+        let metadata = fs::metadata(filepath).expect("unable to read metadata");
+        let mut b = vec![0; metadata.len() as usize];
+        f.read(&mut b).expect("buffer overflow");
+        for i in 0..b.len() {
+            self.memory[512 + i] = b[i];
+        }
+    }
+    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;
+        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;
+        // TODO
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_load_game() {
+        let mut c = Chip8::new();
+        c.load_game("Cargo.toml");
+        c.emulate_cycle();
+        // println!("{:?}", c.memory);
+    }
+}

src/main.rs

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+use clap::{App, Arg};
+
+use chip8::Chip8;
+
+struct SdlEmulator {
+    w: usize,
+    h: usize,
+    zoom: usize,
+    chip8: Chip8,
+}
+
+impl SdlEmulator {
+    fn new(w: usize, h: usize, zoom: usize) -> SdlEmulator {
+        let mut c = Chip8::new();
+
+        SdlEmulator {
+            w,
+            h,
+            zoom,
+            chip8: c,
+        }
+    }
+    fn draw_graphics(&mut self) {
+        // TODO
+    }
+    fn set_keys(&mut self) {
+        // TODO
+    }
+}
+
+fn main() {
+    let matches = App::new("chip8-rs")
+        .version("0.0.1")
+        .about("chip8 emulator")
+        .arg(
+            Arg::with_name("file")
+                .short("f")
+                .long("file")
+                .takes_value(true)
+                .help("File path of the rom to load"),
+        )
+        .get_matches();
+    let file = matches.value_of("file");
+    let file = match file {
+        Some(file) => file,
+        _ => panic!("Please specify file path of the rom to load"),
+    };
+    println!("{:?}", file);
+
+    let mut e = SdlEmulator::new(64, 32, 8);
+    loop {
+        e.chip8.emulate_cycle();
+        if e.chip8.draw_flag {
+            e.draw_graphics();
+        }
+        e.set_keys();
+        // delay
+    }
+}