commit e565a98e6d4f0d59e08eca57a6ced8fe655f5c1b
Author: rick <rick@gnous.eu>
Date:   Mon Feb 7 01:24:11 2022 +0100

    first files: code skeleton

diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..e23b384
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "chip8-emulator"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+sdl2 = "0.35.1"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..f5a7238
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,198 @@
+extern crate sdl2;
+
+use sdl2::pixels::Color;
+use sdl2::event::Event;
+use sdl2::keyboard::Keycode;
+use sdl2::video::Window;
+
+use std::fs::File;
+use std::path::Path;
+use std::io;
+use std::io::Read;
+
+const font: [u8; 80] = [
+    0xF0, 0x90, 0x90, 0x90, 0xF0,
+    0x20, 0x60, 0x20, 0x20, 0x70,
+    0xF0, 0x10, 0xF0, 0x80, 0xF0,
+    0xF0, 0x10, 0xF0, 0x10, 0xF0,
+    0x90, 0x90, 0xF0, 0x10, 0x10,
+    0xF0, 0x80, 0xF0, 0x10, 0xF0,
+    0xF0, 0x80, 0xF0, 0x90, 0xF0,
+    0xF0, 0x10, 0x20, 0x40, 0x40,
+    0xF0, 0x90, 0xF0, 0x90, 0xF0,
+    0xF0, 0x90, 0xF0, 0x10, 0xF0,
+    0xF0, 0x90, 0xF0, 0x90, 0x90,
+    0xE0, 0x90, 0xE0, 0x90, 0xE0,
+    0xF0, 0x80, 0x80, 0x80, 0xF0,
+    0xE0, 0x90, 0x90, 0x90, 0xE0,
+    0xF0, 0x80, 0xF0, 0x80, 0xF0,
+    0xF0, 0x80, 0xF0, 0x80, 0x80 
+];
+
+struct Machine {
+    memory: [u8; 4096],
+    key_inputs: [i32; 16],
+    display_buffer: [[i32; 64]; 32],
+    gpio: [i8; 16],
+    index: i16,
+    opcode: u16,
+    pc: usize,
+    stack: Vec<i32>
+}
+
+fn decodeOp(op1: u8, op2: u8) -> u16 {
+    let ret: u16 = u16::from(op1) << 2;
+    ret + u16::from(op2) >> 2
+}
+
+impl Machine {
+    /// Initialise une machine en mettant tout à 0 (RAM, PC...)
+    pub fn new() -> Self {
+        Machine {
+            memory: [0; 4096],
+            key_inputs: [0; 16],
+            display_buffer: [[0; 64]; 32],
+            gpio: [0; 16],
+            index: 0,
+            opcode: 0,
+            pc: 0,
+            stack: Vec::new(),
+        }
+    }
+
+    pub fn init(&mut self) {
+        for i in 0..font.len() {
+            self.memory[i] = font[i];
+        }
+
+        self.pc = 0x200;
+    }
+
+    /// charge une ROM en mémoire
+    pub fn loadRom(&mut self, p: &Path) -> io::Result<()> {
+        let mut buffer = Vec::new();
+        let mut f = File::open(p)?;
+        f.read_to_end(&mut buffer)?;
+
+        for i in 0..buffer.len() {
+            self.memory[i + 0x200] = buffer[i];
+        }
+
+        Ok(())
+    }
+
+    pub fn cycle(&mut self, screen: &mut sdl2::render::Canvas<Window>) {
+        self.opcode = ((self.memory[self.pc] as u16) << 8) 
+            + (self.memory[self.pc + 1] as u16);
+
+        self.pc += 2;
+        //let o = self.opcode & 0xf000;
+
+        match (self.opcode & 0xf000) >> 12 {
+            0 => match self.opcode {
+                0x00E0 => screen.clear(),
+                0x00EE => println!("RET"),
+                _ => println!("SYS"),
+            }
+            1 => println!("JP"),
+            2 => println!("CALL"),
+            3 => println!("SE"),
+            4 => println!("SNE"),
+            5 => println!("SE 5"),
+            6 => println!("LD"),
+            7 => println!("ADD"),
+            8 => {
+                let x = (self.opcode & 0x0f00) >> 8;
+                let y = (self.opcode & 0x00f0) >> 4;
+                match self.opcode & 0x000f {
+                    0 => println!("LD 8"),
+                    1 => println!("OR"),
+                    2 => println!("AND"),
+                    3 => println!("XOR"),
+                    4 => println!("ADD"),
+                    5 => println!("SUB"),
+                    6 => println!("SHR"),
+                    7 => println!("SUBN"),
+                    0xE => println!("SHL"),
+                    _ => println!("error 8")
+                }
+            }
+            9 => println!("SNE 9"),
+            0xA => println!("LD A"),
+            0xB => println!("JP B"),
+            0xC => println!("RND "),
+            0xD => println!("DRW"),
+            0xE => {
+                let x = (self.opcode & 0x0f00) >> 8;
+                match self.opcode & 0x00ff {
+                    0x9E => println!("SKP"),
+                    0xA1 => println!("SKNP"),
+                    _ => println!("error E")
+                }
+            }
+            0xF => {
+                let x = (self.opcode & 0x0f00) >> 8;
+                match self.opcode & 0x00ff {
+                    0x07 => println!("LD F 7"),
+                    0x0A => println!("LD F A"),
+                    0x15 => println!("LD F 15"),
+                    0x18 => println!("LD F 18"),
+                    0x1E => println!("ADD F 1E"),
+                    0x29 => println!("LD F 2"),     // self.index = self.gpio[x] * 5) & 0x0fff
+                    0x33 => println!("LD F 3"),
+                    0x55 => println!("LD F 5"),
+                    0x65 => println!("LD F 6"),
+                    _ => println!("error F")
+                }
+            }
+            _ => println!("error")
+        }
+    }
+}
+
+
+fn main() {
+    let mut t : Machine = Machine::new();
+    println!("{:?}", t.memory);
+    t.init();
+    t.loadRom(Path::new("15PUZZLE"));
+    println!("\n\n{:?}", t.memory);
+    //t.cycle();
+
+    let sdl_context = sdl2::init().unwrap();
+    let video_subsystem = sdl_context.video().unwrap();
+    let window = video_subsystem.window("Chip8 Emulator", 900, 700)
+        .position_centered()
+        .build()
+        .unwrap();
+
+    let mut canvas = window.into_canvas().build().unwrap();
+    canvas.set_draw_color(Color::RGB(0, 255, 255));
+    canvas.clear();
+    canvas.present();
+
+    let mut event_pump = sdl_context.event_pump().unwrap();
+    let mut i = 0;
+
+    'running: loop {
+        /*
+        i = (i + 1) % 255;
+        canvas.set_draw_color(Color::RGB(i, 64, 255 - i));
+        canvas.clear();
+        */
+        t.cycle(&mut canvas);
+
+        /*
+        for event in event_pump.poll_iter() {
+            match event {
+                Event::KeyDown { keycode: Some(Keycode::Escape), ..} => {
+                    break 'running
+                },
+                _ => {}
+            }
+        }
+        */
+
+        canvas.present();
+    }
+}