IBM logo mostly working with slight graphical error

.gitignore

@@ -1 +1,3 @@
 /target
+/IBMLogo.ch8
+/.idea

Cargo.toml

@@ -4,3 +4,9 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+clap = { version = "4.5.28", features = ["derive"] }
+clap_derive = "4.5.28"
+pixels = "0.15.0"
+tao = "0.31.1"
+tracing = "0.1.41"
+tracing-subscriber = { version = "0.3.19", features = ["env-filter"] }

src/main.rs

@@ -1,3 +1,306 @@
-fn main() {
-    println!("Hello, world!");
+use std::path::PathBuf;
+use clap::Parser;
+use std::fs::File;
+use std::io::prelude::*;
+use std::num::NonZeroU32;
+use std::rc::Rc;
+use pixels::{Error, Pixels, SurfaceTexture};
+use tao::{
+    event::{Event, KeyEvent, WindowEvent},
+    event_loop::{ControlFlow, EventLoop},
+    window::WindowBuilder,
+    keyboard::KeyCode,
+};
+use tao::dpi::LogicalSize;
+use tracing::{info, error};
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
+use std::sync::Arc;
+
+
+#[derive(Parser, Debug)]
+struct Args {
+    #[arg(short, long)]
+    file: PathBuf,
 }
+
+#[derive(Copy, Clone)]
+struct Chip8 {
+    display: [u64; 32],
+    index_register: u16,
+    registers: [u8; 16],
+    sound_timer: u8,
+    delay_timer: u8,
+    ram: [u8; 4096],
+    pc: u16,
+    stack: [u8; 64],
+    stack_pointer: u8,
+}
+
+impl Chip8 {
+    fn new() -> Self {
+        Chip8 {
+            display: [0;32],
+            index_register: 0,
+            registers: [0;16],
+            sound_timer: 0,
+            delay_timer: 0,
+            ram: [0; 4096],
+            pc: 0x200,
+            stack: [0; 64],
+            stack_pointer: 0,
+        }
+    }
+
+    fn insert_font(mut self) -> Self {
+        font_initialiser(&mut self.ram);
+        self
+    }
+
+    fn load_file(mut self, file: PathBuf) -> Self {
+        file_reader(&mut self.ram, file);
+        self
+    }
+
+    fn draw(self, frame: &mut [u8], dimensions: (u32, u32)) -> Self {
+        for(i, pixel) in frame.chunks_exact_mut(4).enumerate() {
+            let x = i % dimensions.0 as usize;
+            let y = i / dimensions.0 as usize;
+
+            let sx = (x * 64) / dimensions.0 as usize;
+            let sy = (y * 32) / dimensions.1 as usize;
+
+            let rgba = if get_bit(self.display[sy], sx as u8) {
+                [0xff, 0xff, 0xff, 0xff]
+            } else {
+                [0x00, 0x00, 0x00, 0xff]
+            };
+
+            pixel.copy_from_slice(&rgba);
+        }
+        info!("done");
+        self
+    }
+
+    fn update(&mut self, instructions: u32) -> Self {
+        for i in 0..instructions {
+            let pointer = self.pc as usize;
+            let opcodes: [u8; 4] = [
+                ((self.ram[pointer] & 240) / 16),
+                (self.ram[pointer] & 15),
+                ((self.ram[pointer + 1] & 240) /16),
+                (self.ram[pointer + 1] & 15)
+            ];
+            self.pc += 2;
+            //info!("{:?}",opcodes);
+            match opcodes[0] {
+                0x00 => {
+                    match opcodes[1] {
+                        0x00 => {
+                            match opcodes[2] {
+                                0x0e => {
+                                    match opcodes[3] {
+                                        0x00 => {
+                                            self.clear_screen();
+                                        },
+                                        _ => {}
+                                    }
+                                },
+                                _ => {}
+                            }
+                        },
+                        _ => {}
+                    }
+                },
+                0x01 => {
+                    let position = (opcodes[1] as u16) << 8 | (opcodes[2] as u16) << 4 | opcodes[3] as u16;
+                    self.pc = position;
+                },
+                0x02 => {
+
+                },
+                0x03 => {
+
+                },
+                0x04 => {
+
+                },
+                0x05 => {
+
+                },
+                0x06 => {
+                    self.registers[opcodes[1] as usize] = opcodes[2] << 4 | opcodes[3];
+                },
+                0x07 => {
+                    let value = (opcodes[2] << 4 | opcodes[3]) as u16;
+                    self.registers[opcodes[1] as usize] = (((self.registers[opcodes[1] as usize] as u16) + value) & 255) as u8;
+                },
+                0x08 => {
+
+                },
+                0x09 => {
+
+                },
+                0x0a => {
+                    self.index_register = (opcodes[1] as u16) << 8 | (opcodes[2] as u16) << 4 | (opcodes[3] as u16);
+                },
+                0x0b => {
+
+                },
+                0x0c => {
+
+                },
+                0x0d => {
+                    let x = self.registers[opcodes[1] as usize] % 64;
+                    let y = self.registers[opcodes[2] as usize] % 32;
+                    self.registers[0x0f] = 0;
+                    for n in 0..opcodes[3] {
+                        let spritedata = self.ram[self.index_register as usize + n as usize];
+                        for i in 0..7 {
+                            let bit = get_bit_u8(spritedata, i);
+                            self.display[(y + n) as usize] = self.display[(y + n) as usize] ^ ((bit as u64) << (x + i));
+                        }
+                    }
+                },
+                0x0e => {
+
+                },
+                0x0f => {
+
+                },
+                _ => {
+                    error!("out of scope opcode");
+                }
+            }
+        }
+        //info!("{:?}",self.display);
+        *self
+    }
+
+    fn clear_screen(mut self) -> Self {
+        self.display = [0;32];
+        self
+    }
+}
+
+fn main() {
+    tracing_subscriber::registry()
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "INFO=debug".into()),
+        )
+        .with(tracing_subscriber::fmt::layer())
+        .init();
+
+    let args = Args::parse();
+    let mut chip8 = Chip8::new().insert_font().load_file(args.file);
+
+    println!("ram: {:?}", chip8.ram);
+
+    let event_loop = EventLoop::new();
+
+    let window = { let window = WindowBuilder::new()
+        .with_title("Chip8 Emulator")
+        .with_inner_size(LogicalSize::new(320, 240))
+        .with_min_inner_size(LogicalSize::new(320, 240))
+        .build(&event_loop)
+        .unwrap();
+        Arc::new(window)
+    };
+
+    let mut pixels = {
+        let window_size = window.inner_size();
+        let surface_texture = SurfaceTexture::new(window_size.width, window_size.height, Arc::clone(&window));
+        Pixels::new(window_size.width, window_size.height, surface_texture).unwrap()
+    };
+
+    let test: u64 = 1;
+    info!("{}", get_bit(test, 0));
+
+    event_loop.run(move |event, _, control_flow| {
+        match event {
+            Event::WindowEvent {event, ..} => match event {
+                WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
+                WindowEvent::Resized(size) => {
+                    if let Err(e) = pixels.resize_surface(size.width, size.height) {
+                        error!("pixels.resize_surface");
+                        *control_flow = ControlFlow::Exit;
+                    }
+                },
+                _ => {}
+            },
+            Event::MainEventsCleared => {
+                info!(chip8.pc);
+                chip8.update(40);
+                info!(chip8.pc);
+                window.request_redraw();
+            }
+            Event::RedrawRequested(_) => {
+                chip8.draw(pixels.frame_mut(), (window.inner_size().width, window.inner_size().height));
+                if let Err(err) = pixels.render() {
+                    error!("pixels.render");
+                    *control_flow = ControlFlow::Exit;
+                }
+            }
+            _ => {}
+        }
+    });
+
+
+}
+
+fn file_reader(ram: &mut [u8; 4096], file: PathBuf) {
+    let mut file = File::open(file).unwrap();
+    let mut file_contents:Vec<u8> = Vec::new();
+    file.read_to_end(&mut file_contents).unwrap();
+    for i in 0..file_contents.len() {
+        ram[i + 0x200] = file_contents[i];
+    }
+}
+
+fn font_initialiser(ram: &mut [u8; 4096]) {
+    let font: [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
+    ];
+
+    for i in 0..80 {
+        ram[i + 0x050] = font[i];
+    }
+}
+
+
+
+fn get_bit(num: u64, bit: u8) -> bool {
+    //info!(bit);
+    if bit <= 63 {
+        let mask: u64 = 1 << bit;
+        let bitvalue = ((num & mask)) != 0;
+        bitvalue
+    } else {
+        false
+    }
+}
+
+fn get_bit_u8(num: u8, bit: u8) -> bool {
+    if bit <= 8 {
+        let mask: u8 = 128 >> bit;
+        let bitvalue = (num & mask) != 0;
+        bitvalue
+    } else {
+        false
+    }
+}