tmerritt/trevors_chip8_toy
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emma now has ability to decode an instruction and to display video and system memory

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This commit is contained in:
Trevor Merritt 2024-08-17 13:40:19 -04:00
parent ceb62d2c53
commit 6dc9ce3721
21 changed files with 2772 additions and 374 deletions
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1772
Cargo.lock generated
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File diff suppressed because it is too large Load Diff

2
Cargo.toml
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@ -1,3 +1,3 @@
[workspace]
members = ["chip8_toy","chip8_core"]
members = ["chip8_toy","chip8_core", "emma"]
resolver = "2"

50
chip8_core/src/parts/CPU.rs
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@ -9,21 +9,20 @@ impl Chip8Registers {
}
}
pub struct Chip8InstructionParameter {
mask: u16
pub mask: u16
}
struct Chip8Instruction {
id: String,
mask: u16,
pattern: u16,
arguments: Vec<Chip8InstructionParameter>,
description: Box<str>
pub struct Chip8Instruction {
pub id: String,
pub mask: u16,
pub pattern: u16,
pub arguments: Vec<Chip8InstructionParameter>,
pub description: Box<str>
}
pub fn fill_chip8_instructions() {
let full_instruction_set = vec![
pub fn fill_chip8_instructions() -> [Chip8Instruction; 34] {
[
Chip8Instruction {
id: "SYS".to_string(),
mask: 0x00,
@ -128,7 +127,7 @@ pub fn fill_chip8_instructions() {
mask: 0x00ff
}
],
description: "TBD".into()
description: "Add value in register 0x0f00 with value 0x00ff".into()
},
Chip8Instruction {
id: "CPY".to_string(),
@ -142,7 +141,7 @@ pub fn fill_chip8_instructions() {
mask: 0x00f0
}
],
description: "TBD".into()
description: "Copy value between Register X and Y".into()
},
Chip8Instruction {
id: "OR".to_string(),
@ -366,7 +365,7 @@ pub fn fill_chip8_instructions() {
mask: 0x0f00
}
],
description: "TBD".into()
description: "Wait for a Key to be pressed".into()
},
Chip8Instruction {
id: "LDT".to_string(),
@ -377,7 +376,7 @@ pub fn fill_chip8_instructions() {
mask: 0x0f00
}
],
description: "TBD".into()
description: "Load Data Timer".into()
},
Chip8Instruction {
id: "LST".to_string(),
@ -388,7 +387,7 @@ pub fn fill_chip8_instructions() {
mask: 0x0f00
}
],
description: "TBD".into()
description: "Load Sound Timer".into()
},
Chip8Instruction {
id: "ADDI".to_string(),
@ -399,7 +398,7 @@ pub fn fill_chip8_instructions() {
mask: 0x0f00
}
],
description: "TBD".into()
description: "Add register with value at I".into()
},
Chip8Instruction {
id: "SETI".to_string(),
@ -432,7 +431,7 @@ pub fn fill_chip8_instructions() {
mask: 0x0f00
}
],
description: "TBD".into()
description: "Store value in register X at offset I".into()
},
Chip8Instruction {
id: "MLOAD".to_string(),
@ -443,7 +442,20 @@ pub fn fill_chip8_instructions() {
mask: 0x0f00
}
],
description: "TBD".into()
description: "Load value into register X at offset I".into()
}
];
]
}
struct Chip8System {
}
impl Chip8System {
}
trait CpuInstruction {
fn execute(input: Chip8System) -> Chip8System;
}

1
chip8_core/src/parts/Display.rs
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@ -7,7 +7,6 @@ pub struct Chip8Display {
impl Chip8Display {
pub fn tick(self: &Self) {
println!("Ticking the display");
}
pub fn render_chip8_display(to_render: Chip8Display) {

10
chip8_toy/Cargo.toml
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@ -5,13 +5,15 @@ edition = "2021"
[dependencies]
trevors_chip8_core = { path = "../chip8_core" }
easy-imgui-sys = { version = "=0.6.0" }
easy-imgui = { version = "=0.6.0" }
easy-imgui-renderer = { version = "=0.6.0" }
easy-imgui-window = { version = "0.6.0" }
log ="0.4"
glutin = "0.32"
glutin-winit = { version = "0.5", optional = true }
raw-window-handle = "0.6"
arboard = { version = "3", optional = true, default-features = false }
winit = { version = "0.30", features = ["x11", "mint"] }
copypasta = "0.10.1"
glium = { version = "0.34.0", default-features = true }
image = "0.25.2"
imgui = { version = "0.12.0", features = ["tables-api"] }
imgui-glium-renderer = "0.12.0"
imgui-winit-support = "0.12.0"

15
chip8_toy/src/app.rs Normal file
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@ -0,0 +1,15 @@
/*
#[derive(Default)]
pub struct App;
impl UiBuilder for App {
fn do_ui(&mut self, ui: &Ui<Self>) {
#[cfg(feature = "docking")]
{
ui.dock_space_over_viewport(0, imgui::DockNodeFlags::None);
}
ui.show_demo_window(None);
}
}*/

14
chip8_toy/src/gui/display.rs
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@ -1,8 +1,6 @@
use easy_imgui::{Ui, UiBuilder};
use easy_imgui_window::{MainWindow, MainWindowWithRenderer};
use winit::{application::ApplicationHandler, event_loop::ActiveEventLoop, window::{Window, WindowAttributes}};
/*
pub struct Chip8Display {
pub window: MainWindowWithRenderer,
}
@ -54,15 +52,6 @@ impl ApplicationHandler for Chip8AppHandler {
if window.main_window().window().id() != window_id {
continue;
}
let res = window.window_event(
&mut self,
&event,
easy_imgui_window::EventFlags::empty(),
);
if res.window_closed {
event_loop.exit();
}
break;
}
}
fn new_events(&mut self, _event_loop: &ActiveEventLoop, _cause: winit::event::StartCause) {
@ -77,3 +66,4 @@ impl ApplicationHandler for Chip8AppHandler {
}
}
*/

4
chip8_toy/src/lib.rs
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@ -1,3 +1,7 @@
pub mod app;
pub mod gui {
pub mod display;
}
pub mod support;

179
chip8_toy/src/main.rs
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@ -1,87 +1,128 @@
use easy_imgui_window::{
easy_imgui as imgui,
easy_imgui_renderer::Renderer,
winit::{
event_loop::{ActiveEventLoop, EventLoop},
window::Window,
},
MainWindow, MainWindowWithRenderer,
};
use trevors_chip8_toy::gui::display::{Chip8App, Chip8AppHandler};
use std::rc::Rc;
use trevors_chip8_core::parts::CPU::fill_chip8_instructions;
use trevors_chip8_toy::support;
use winit::{event::WindowEvent, event_loop::EventLoop};
use imgui::*;
/*
pub fn display_instruction_table(current_index: u32, ui: &Ui<App>) -> u32 {
let to_display = fill_chip8_instructions();
let mut return_index = current_index;
let current_instruction = to_display.get(return_index as usize).unwrap();
ui.text("Instructions");
ui.set_next_item_width(100f32);
ui.with_group(|| {
ui.text(format!("{}", current_instruction.description).as_str());
if current_instruction.arguments.is_empty() {
ui.text("No Parameters");
} else {
for current_parameter in current_instruction.arguments {
ui.text(format!("{}", current_parameter.mask).as_str());
}
}
ui.text(format!("{:#}", current_instruction.arguments).as_str());
ui.text("This is where cool stuff happens part 2");
});
ui.same_line();
ui.with_group(|| {
for (index, current) in to_display.iter().enumerate() {
if ui
.selectable_config(current.id.clone())
.selected(index == return_index as usize)
.build()
{
return_index = index as u32;
}
}
});
return_index
}
*/
fn chip8_instructions(initial_index: u32, ui: &mut Ui) -> u32 {
let to_display = fill_chip8_instructions();
let mut return_index = initial_index;
let instruction_to_display = to_display.get(return_index as usize).unwrap();
let instruction_window = ui
.window("Instructions")
.size([400.0, 400.0], Condition::FirstUseEver)
.build(|| {
ui.text("This should be my current instruction example");
ui.same_line();
ui.set_next_item_width(-1.0f32);
for (index, instruction) in to_display.iter().enumerate() {
if ui
.selectable_config(instruction.id.to_string())
.selected(index as u32 == return_index)
.build()
{
return_index = index as u32;
println!("RETURN INDEX {return_index}");
}
}
});
return_index
}
fn main() {
let mut value = 0;
let choices = ["test test this is 1", "test test this is 2"];
let mut selected_instruction = 0;
support::simple_init(file!(), move |_, ui| {
selected_instruction = chip8_instructions(selected_instruction, ui);
ui.window("Hello world")
.size([300.0, 110.0], Condition::FirstUseEver)
.build(|| {
ui.text_wrapped("Hello world!");
if ui.button(choices[value]) {
value += 1;
value %= 2;
}
ui.button("This...is...imgui-rs!");
ui.separator();
let mouse_pos = ui.io().mouse_pos;
ui.text(format!(
"Mouse Position: ({:.1},{:.1})",
mouse_pos[0], mouse_pos[1]
));
});
});
}
/*
fn main() {
let event_loop = EventLoop::new().unwrap();
let mut main = Chip8AppHandler {
windows: vec![],
app: Chip8App,
};
let mut main = AppHandler::<App>::default();
main.attributes().title = String::from("Example-420");
event_loop.run_app(&mut main).unwrap();
}
#[derive(Default)]
struct AppHandler {
windows: Vec<MainWindowWithRenderer>,
app: App,
pub struct App {
pub selected_instruction_index: u32,
}
impl winit::application::ApplicationHandler for AppHandler {
fn suspended(&mut self, _event_loop: &ActiveEventLoop) {
self.windows.clear();
}
fn resumed(&mut self, event_loop: &ActiveEventLoop) {
let wattr_1 = Window::default_attributes().with_title("Example #1");
let main_window_1 = MainWindow::new::<()>(&event_loop, wattr_1).unwrap();
let mut window_1 = MainWindowWithRenderer::new(main_window_1);
impl App {}
let wattr_2 = Window::default_attributes().with_title("Example #2");
let main_window_2 = MainWindow::new::<()>(&event_loop, wattr_2).unwrap();
// The GL context can be reused, but the imgui context cannot
let mut renderer_2 = Renderer::new(Rc::clone(window_1.renderer().gl_context())).unwrap();
renderer_2.set_background_color(Some(imgui::Color::GREEN));
let window_2 = MainWindowWithRenderer::new_with_renderer(main_window_2, renderer_2);
self.windows.push(window_1);
self.windows.push(window_2);
impl Application for App {
type UserEvent = ();
type Data = ();
fn new(_: Args<()>) -> App {
App {
selected_instruction_index: 0,
}
fn window_event(
&mut self,
event_loop: &ActiveEventLoop,
window_id: winit::window::WindowId,
event: winit::event::WindowEvent,
) {
for window in &mut self.windows {
if window.main_window().window().id() != window_id {
continue;
}
let res = window.window_event(
&mut self.app,
&event,
easy_imgui_window::EventFlags::empty(),
);
fn window_event(&mut self, args: Args<()>, _event: WindowEvent, res: EventResult) {
if res.window_closed {
event_loop.exit();
}
break;
}
}
fn new_events(&mut self, _event_loop: &ActiveEventLoop, _cause: winit::event::StartCause) {
for window in &mut self.windows {
window.new_events();
}
}
fn about_to_wait(&mut self, _event_loop: &ActiveEventLoop) {
for window in &mut self.windows {
window.about_to_wait();
args.event_loop.exit();
}
}
}
#[derive(Default)]
struct App;
impl imgui::UiBuilder for App {
fn do_ui(&mut self, ui: &imgui::Ui<Self>) {
#[cfg(feature = "docking")]
@ -89,6 +130,14 @@ impl imgui::UiBuilder for App {
ui.dock_space_over_viewport(0, imgui::DockNodeFlags::None);
}
let x = ui.collapsing_header_config("collapsing header");
ui.with_group(|| {
self.selected_instruction_index =
display_instruction_table(self.selected_instruction_index, ui);
});
ui.show_demo_window(None);
}
}
*/

18
chip8_toy/src/support/clipboard.rs Normal file
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@ -0,0 +1,18 @@
use copypasta::{ClipboardContext, ClipboardProvider};
use imgui::ClipboardBackend;
pub struct ClipboardSupport(pub ClipboardContext);
pub fn init() -> Option<ClipboardSupport> {
ClipboardContext::new().ok().map(ClipboardSupport)
}
impl ClipboardBackend for ClipboardSupport {
fn get(&mut self) -> Option<String> {
self.0.get_contents().ok()
}
fn set(&mut self, text: &str) {
// ignore errors?
let _ = self.0.set_contents(text.to_owned());
}
}

164
chip8_toy/src/support/mod.rs Normal file
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@ -0,0 +1,164 @@
use glium::glutin::surface::WindowSurface;
use glium::{Display, Surface};
use imgui::{Context, FontConfig, FontGlyphRanges, FontSource, Ui};
use imgui_glium_renderer::Renderer;
use imgui_winit_support::winit::dpi::LogicalSize;
use imgui_winit_support::winit::event::{Event, WindowEvent};
use imgui_winit_support::winit::event_loop::EventLoop;
use imgui_winit_support::winit::window::WindowBuilder;
use imgui_winit_support::{HiDpiMode, WinitPlatform};
use std::path::Path;
use std::time::Instant;
mod clipboard;
pub const FONT_SIZE: f32 = 13.0;
#[allow(dead_code)] // annoyingly, RA yells that this is unusued
pub fn simple_init<F: FnMut(&mut bool, &mut Ui) + 'static>(title: &str, run_ui: F) {
init_with_startup(title, |_, _, _| {}, run_ui);
}
pub fn init_with_startup<FInit, FUi>(title: &str, mut startup: FInit, mut run_ui: FUi)
where
FInit: FnMut(&mut Context, &mut Renderer, &Display<WindowSurface>) + 'static,
FUi: FnMut(&mut bool, &mut Ui) + 'static,
{
let mut imgui = create_context();
let title = match Path::new(&title).file_name() {
Some(file_name) => file_name.to_str().unwrap(),
None => title,
};
let event_loop = EventLoop::new().expect("Failed to create EventLoop");
let builder = WindowBuilder::new()
.with_title(title)
.with_inner_size(LogicalSize::new(1024, 768));
let (window, display) = glium::backend::glutin::SimpleWindowBuilder::new()
.set_window_builder(builder)
.build(&event_loop);
let mut renderer = Renderer::init(&mut imgui, &display).expect("Failed to initialize renderer");
if let Some(backend) = clipboard::init() {
imgui.set_clipboard_backend(backend);
} else {
eprintln!("Failed to initialize clipboard");
}
let mut platform = WinitPlatform::init(&mut imgui);
{
let dpi_mode = if let Ok(factor) = std::env::var("IMGUI_EXAMPLE_FORCE_DPI_FACTOR") {
// Allow forcing of HiDPI factor for debugging purposes
match factor.parse::<f64>() {
Ok(f) => HiDpiMode::Locked(f),
Err(e) => panic!("Invalid scaling factor: {}", e),
}
} else {
HiDpiMode::Default
};
platform.attach_window(imgui.io_mut(), &window, dpi_mode);
}
let mut last_frame = Instant::now();
startup(&mut imgui, &mut renderer, &display);
event_loop
.run(move |event, window_target| match event {
Event::NewEvents(_) => {
let now = Instant::now();
imgui.io_mut().update_delta_time(now - last_frame);
last_frame = now;
}
Event::AboutToWait => {
platform
.prepare_frame(imgui.io_mut(), &window)
.expect("Failed to prepare frame");
window.request_redraw();
}
Event::WindowEvent {
event: WindowEvent::RedrawRequested,
..
} => {
let ui = imgui.frame();
let mut run = true;
run_ui(&mut run, ui);
if !run {
window_target.exit();
}
let mut target = display.draw();
target.clear_color_srgb(1.0, 1.0, 1.0, 1.0);
platform.prepare_render(ui, &window);
let draw_data = imgui.render();
renderer
.render(&mut target, draw_data)
.expect("Rendering failed");
target.finish().expect("Failed to swap buffers");
}
Event::WindowEvent {
event: WindowEvent::Resized(new_size),
..
} => {
if new_size.width > 0 && new_size.height > 0 {
display.resize((new_size.width, new_size.height));
}
platform.handle_event(imgui.io_mut(), &window, &event);
}
Event::WindowEvent {
event: WindowEvent::CloseRequested,
..
} => window_target.exit(),
event => {
platform.handle_event(imgui.io_mut(), &window, &event);
}
})
.expect("EventLoop error");
}
/// Creates the imgui context
pub fn create_context() -> imgui::Context {
let mut imgui = Context::create();
// Fixed font size. Note imgui_winit_support uses "logical
// pixels", which are physical pixels scaled by the devices
// scaling factor. Meaning, 13.0 pixels should look the same size
// on two different screens, and thus we do not need to scale this
// value (as the scaling is handled by winit)
imgui.fonts().add_font(&[
FontSource::TtfData {
data: include_bytes!("../../../resources/Roboto-Regular.ttf"),
size_pixels: FONT_SIZE,
config: Some(FontConfig {
// As imgui-glium-renderer isn't gamma-correct with
// it's font rendering, we apply an arbitrary
// multiplier to make the font a bit "heavier". With
// default imgui-glow-renderer this is unnecessary.
rasterizer_multiply: 1.5,
// Oversampling font helps improve text rendering at
// expense of larger font atlas texture.
oversample_h: 4,
oversample_v: 4,
..FontConfig::default()
}),
},
FontSource::TtfData {
data: include_bytes!("../../../resources/mplus-1p-regular.ttf"),
size_pixels: FONT_SIZE,
config: Some(FontConfig {
// Oversampling font helps improve text rendering at
// expense of larger font atlas texture.
oversample_h: 4,
oversample_v: 4,
// Range of glyphs to rasterize
glyph_ranges: FontGlyphRanges::japanese(),
..FontConfig::default()
}),
},
]);
imgui.set_ini_filename(None);
imgui
}

8
emma/Cargo.toml Normal file
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@ -0,0 +1,8 @@
[package]
name = "emmaemu"
version = "0.1.0"
edition = "2021"
autobenches = true
[dependencies]
ratatui = "0.28.0"

516
emma/src/bin/emma.rs Normal file
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@ -0,0 +1,516 @@
use std::io::{stdout, Result};
use font::load_fonts_into_memory;
use ratatui::{
backend::CrosstermBackend,
crossterm::{
event::{self, KeyCode, KeyEventKind},
terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
ExecutableCommand,
},
layout::{Alignment, Rect},
style::Stylize,
widgets::{List, Paragraph},
Frame, Terminal,
};
// nnn or addr - A 12-bit value, the lowest 12 bits of the instruction
pub fn read_addr_from_instruction(instruction_to_read_from: u16) -> u16 {
instruction_to_read_from & 0b0000111111111111
}
// n or nibble - A 4-bit value, the lowest 4 bits of the instruction
pub fn read_nibble_from_instruction(instruction_to_read_from: u16) -> u16 {
instruction_to_read_from & 0b0000000000001111
}
// x - A 4-bit value, the lower 4 bits of the high byte of the instruction
pub fn read_x_from_instruction(instruction_to_read_from: u16) -> u16 {
(instruction_to_read_from & 0b0000111100000000).rotate_right(8)
}
// y - A 4-bit value, the upper 4 bits of the low byte of the instruction
pub fn read_y_from_instruction(instruction_to_read_from: u16) -> u16 {
(instruction_to_read_from & 0b0000000011110000).rotate_right(4)
}
// kk or byte - An 8-bit value, the lowest 8 bits of the instruction
pub fn read_byte_from_instruction(instruction_to_read_from: u16) -> u16 {
(instruction_to_read_from & 0b0000000011111111)
}
mod font;
#[derive(Clone)]
struct Chip8CpuData {
pub pc: u16,
pub sp: u8,
pub memory: [u8; CHIP8_MEMORY_SIZE as usize],
pub video_memory: [bool; CHIP8_VIDEO_MEMORY],
pub registers: [u8; 16],
pub sound_timer: u8,
pub delay_timer: u8,
pub i_register: u16,
}
const CHIP8_REGISTER_COUNT: i32 = 16;
const CHIP8_MEMORY_SIZE: i32 = 2048i32;
const CHIP8_VIDEO_WIDTH: i32 = 64i32;
const CHIP8_VIDEO_HEIGHT: i32 = 32i32;
const CHIP8_VIDEO_MEMORY: usize = (CHIP8_VIDEO_HEIGHT * CHIP8_VIDEO_WIDTH) as usize;
const CHIP8_ROM_SIZE: usize = 512;
impl Default for Chip8CpuData {
fn default() -> Self {
let mut memory: [u8; 2048] = [0; 2048];
memory = load_fonts_into_memory(memory);
dump_memory_to_console(memory);
Self {
pc: 0x0200,
sp: 0x00,
memory: [0; 2048],
video_memory: [false; CHIP8_VIDEO_MEMORY],
registers: [0; CHIP8_REGISTER_COUNT as usize],
sound_timer: 0xFF,
delay_timer: 0xFF,
i_register: 0x0000,
}
}
}
impl Chip8CpuData {
pub fn new() -> Self {
Chip8CpuData::default()
}
}
fn system_memory_to_text_render(data_to_dump: [u8; 2048]) -> String {
let mut to_return = String::new();
for i in 0..256 {
to_return += &format!("{:x}\t", data_to_dump[i as usize]).to_string();
if ((i + 1) % CHIP8_REGISTER_COUNT) == 0 {
to_return += "\n";
}
}
to_return
}
fn dump_memory_to_console(data_to_dump: [u8; 2048]) {
println!("STARTING TO DUMP MEMORY TO CONSOLE");
println!("{}", system_memory_to_text_render(data_to_dump));
println!("DONE DUMPING!");
panic!("DONE DUMPING");
}
fn display_data_to_text_render(data_display: [bool; 2048]) -> String {
let mut output = String::new();
for row in 0..32 {
let row_offset = row * 32;
for column in 0..64 {
let data_position = row_offset + column;
println!("DP {} {} {} {}", data_position, row, row_offset, column);
output += if data_display[data_position] {
"*"
} else {
" "
};
}
output += "\n";
}
output
}
fn render_display(display_data: [bool; 2048]) {
println!("{}", display_data_to_text_render(display_data));
}
#[derive(Clone)]
enum Chip8CpuStates {
WaitingForInstruction,
ExecutingInstruction,
Error,
}
struct Chip8CpuState {
state: Chip8CpuStates,
cpu: Chip8CpuData
}
enum Chip8CpuInstructions {
SysAddr(u16), // 0x0nnn Exit to System Call
CLS, // 0x00E0 Clear Screen
RET, // 0x00EE Return from Subroutine
JpAddr(u16), // 0x1nnn Jump to Address
CallAddr(u16), // 0x2nnn Call Subroutine
SeVxByte(u16, u16), // 0x3xkk Skip next instruction if Vx = kk.
SneVxByte(u16, u16), // 0x4xkk Skip next instruction if Vx != kk
SeVxVy(u16, u16), // 0x5xy0 Skip next instruction if Vx == Vy
LdVxByte(u16, u16), // 0x6xkk Set Vx = kk
AddVxByte(u16, u16), // 0x7xkk Set Vx = Vx + kk
LdVxVy(u16, u16), // 0x8xy0 Set value of Vy in Vx
OrVxVy(u16, u16), // 0x8xy1 Set Vx = Vx OR Vy
AndVxVy(u16, u16), // 0x8xy2 Set Vx = Vx AND Vy
XorVxVy(u16, u16), // 0x8xy3 Set Vx = Vx XOR Vy
AddVxVy(u16, u16), // 0x8xy4 Set Vx = Vx + Vy (SET VF on Carry)
SubVxVy(u16, u16), // 0x8xy5 Set Vx = Vx - Vy (Set VF NOT Borrow)
ShrVxVy(u16, u16), // 0x8xy6 Set Vx = Vx SHR 1 (Shift Rotated Right 1)
SubnVxVy(u16, u16), // 0x8xy7 Set Vx = Vy - Vx (Set VF NOT Borrow)
ShlVxVy(u16, u16), // 0x8xyE Shift Left
SneVxVy(u16, u16), // 0x9xy0 Skip next instruction if Vx != Vy
LdIAddr(u16), // 0xAnnn VI = nnn
JpV0Addr(u16), // 0xBnnn Jump to nnn+V0
RndVxByte(u16, u16), // 0xCxkk Vx = random byte AND kk
DrawVxVyNibble(u16, u16, u16), // 0xDxyn Display N byte sprite starting at Vx to Vy
SkpVx(u16), // 0xE09E Skip next instruction if key in Vx pressed
SnkpVx(u16), // 0xE0A1 Skip next instruction if key in Vx NOT pressed
LdVxDt(u16), // 0xFx07 Set Vx = Delay timer
LdVxK(u16), // 0xFx0A Wait for key, put in Vx
LdDtVx(u16), // 0xFx15 Set Delay Timer
LdStVx(u16), // 0xFx18 Set Sount Timer
AddIVx(u16), // 0xFx1E I = I + Vx
LdFVu(u16), // 0xFx29 Set I = Location of sprite for Digit Vx
LdBVx(u16), // 0xFx33 Store BCD of Vx in I, I+1, I+2
LdIVx(u16), // 0xFx55 Store V0 to Vx in memory starting at I
LdVxI(u16), // 0xFx65 Load V0 to Vx in memory starting at I
XXXXERRORINSTRUCTION,
}
fn bytes_to_instruction(to_read: u16) -> Chip8CpuInstructions {
let mut decoded_instruction = Chip8CpuInstructions::XXXXERRORINSTRUCTION;
match to_read {
0x00E0 => {
// 00E0 - CLS
// Clear the display.
decoded_instruction = Chip8CpuInstructions::CLS;
}
0x00EE => {
// 00EE - RET
// Return from a subroutine.
decoded_instruction = Chip8CpuInstructions::RET;
}
0x0000..=0x0FFF => {
// 0nnn - SYS addr
// Jump to a machine code routine at nnn.
decoded_instruction =
Chip8CpuInstructions::SysAddr(read_addr_from_instruction(to_read));
}
0x1000..=0x1FFF => {
// 1nnn - JP addr
// Jump to location nnn.
decoded_instruction = Chip8CpuInstructions::JpAddr(read_addr_from_instruction(to_read));
}
0x2000..=0x2FFF => {
// 2nnn - CALL addr
// Call subroutine at nnn.
decoded_instruction =
Chip8CpuInstructions::CallAddr(read_addr_from_instruction(to_read));
}
0x3000..=0x3FFF => {
// 3xkk - SE Vx, byte
// Skip next instruction if Vx = kk.
decoded_instruction = Chip8CpuInstructions::SeVxByte(
read_x_from_instruction(to_read),
read_byte_from_instruction(to_read),
)
}
0x4000..=0x4FFF => {
// 4xkk - SNE Vx, byte
// Skip next instruction if Vx != kk.
decoded_instruction = Chip8CpuInstructions::SneVxByte(
read_x_from_instruction(to_read),
read_byte_from_instruction(to_read),
);
}
0x5000..=0x5FF0 => {
// 5xy0 - SE Vx, Vy
// Skip next instruction if Vx = Vy.
decoded_instruction = Chip8CpuInstructions::SeVxVy(
read_x_from_instruction(to_read),
read_y_from_instruction(to_read),
)
}
0x6000..=0x6FFF => {
// 6xkk - LD Vx, byte
// Set Vx = kk.
decoded_instruction = Chip8CpuInstructions::LdVxVy(
read_x_from_instruction(to_read),
read_byte_from_instruction(to_read),
);
}
0x7000..=0x7FFF => {
// ADD Vx, Byte
decoded_instruction = Chip8CpuInstructions::AddVxByte(
read_x_from_instruction(to_read),
read_byte_from_instruction(to_read),
);
}
0x8000..=0x8FFE => {
// 0x8000 Series
let last_nibble = to_read | 0x8000;
match last_nibble {
0x0 => {
// LD Vx, Vy
decoded_instruction = Chip8CpuInstructions::LdVxVy(
read_x_from_instruction(to_read),
read_y_from_instruction(to_read),
);
}
0x1 => {
// OR Vx, Vy
decoded_instruction = Chip8CpuInstructions::OrVxVy(
read_x_from_instruction(to_read),
read_y_from_instruction(to_read),
);
}
0x2 => {
// AND Vx, Vy
decoded_instruction = Chip8CpuInstructions::AndVxVy(
read_x_from_instruction(to_read),
read_y_from_instruction(to_read),
);
}
0x3 => {
// XOR Vx, Vy
decoded_instruction = Chip8CpuInstructions::XorVxVy(
read_x_from_instruction(to_read),
read_y_from_instruction(to_read),
);
}
0x4 => {
// AND Vx, Vy
decoded_instruction = Chip8CpuInstructions::AndVxVy(
read_x_from_instruction(to_read),
read_y_from_instruction(to_read),
);
}
0x5 => {
// SUB Vx, Vy
decoded_instruction = Chip8CpuInstructions::SubnVxVy(
read_x_from_instruction(to_read),
read_y_from_instruction(to_read),
);
}
0x6 => {
// SHR Vx, {, Vy }
decoded_instruction = Chip8CpuInstructions::ShrVxVy(
read_x_from_instruction(to_read),
read_y_from_instruction(to_read),
);
}
0x7 => {
// SUBN Vx, Vy
decoded_instruction = Chip8CpuInstructions::SubnVxVy(
read_x_from_instruction(to_read),
read_y_from_instruction(to_read),
);
}
0xE => {
// SHL Vx, {, Vy}
decoded_instruction = Chip8CpuInstructions::ShlVxVy(
read_x_from_instruction(to_read),
read_y_from_instruction(to_read),
);
}
_ => {
panic!("UNABLE TO DECODE 0x8000 SERIES INSTRUCTION");
}
}
}
0x9000..=0x9FF0 => {
// SNE Vx, Vy
decoded_instruction = Chip8CpuInstructions::SneVxVy(
read_x_from_instruction(to_read),
read_y_from_instruction(to_read),
);
}
0xA000..=0xAFFF => {
// LD I, Addr
decoded_instruction =
Chip8CpuInstructions::LdIAddr(read_addr_from_instruction(to_read));
}
0xB000..=0xBFFF => {
// JP V0, Addr
}
0xC000..=0xCFFF => {
// RND Vx, byte
}
0xD000..0xDFFF => {
// DRAW Vx, Vy, nibble
}
0xE09E..=0xEFA1 => {}
_ => {
panic!("UNABLE TO DECODE INSTRUCTION")
}
}
return decoded_instruction;
}
impl Chip8CpuState {
fn execute(&mut self, event: Chip8CpuInstructions) {
match (self.state.clone(), event) {
(Chip8CpuStates::WaitingForInstruction, Chip8CpuInstructions::SysAddr(new_address)) => {
self.cpu.pc = new_address;
},
_ => ()
}
}
}
#[derive(Clone)]
struct Chip8System {
pub system_memory: [u8; 2048],
pub rom: [u8; 512],
pub sound_timer: u8,
pub system_timer: u8,
}
impl Default for Chip8System {
fn default() -> Self {
// init by loading the fonts...
let mut working_system_memory: [u8; CHIP8_MEMORY_SIZE as usize] =
[0; CHIP8_MEMORY_SIZE as usize];
// Load fonts to memory
working_system_memory = load_fonts_into_memory(working_system_memory);
Self {
system_memory: working_system_memory,
rom: [0; CHIP8_ROM_SIZE],
sound_timer: 0,
system_timer: 0,
}
}
}
impl Chip8System {
fn add_fonts_to_memory(
to_add_fonts_to: [u8; CHIP8_MEMORY_SIZE as usize],
) -> [u8; CHIP8_MEMORY_SIZE as usize] {
panic!("DONT USE THIS USE \"load_fonts_into_memory\" INSTEAD");
}
pub fn new() -> Self {
Chip8System {
system_memory: [0; CHIP8_MEMORY_SIZE as usize],
rom: [0; CHIP8_ROM_SIZE as usize],
sound_timer: 0,
system_timer: 0,
}
}
}
#[derive(Clone)]
struct AppState {
menu_items: Vec<String>,
selected_menu_item: i32,
system: Chip8CpuData,
}
impl Default for AppState {
fn default() -> Self {
println!("Creating new AppState");
Self {
menu_items: vec![
"Step CPU <F5>".into(),
"Reset CPU <F12>".into(),
"Item 3".into(),
],
selected_menu_item: 0,
system: Chip8CpuData {
..Default::default()
},
}
}
}
fn main() -> Result<()> {
// stdout().execute(EnterAlternateScreen)?;
// enable_raw_mode()?;
// let mut terminal = Terminal::new(CrosstermBackend::new(stdout()))?;
// terminal.clear()?;
let app = AppState::default();
loop {
// Draw Ui...
// terminal.draw(|frame| {
// render_menu_list(app.clone(), frame);
// render_cpu_state(app.system.clone(), frame);
// })?;
// ...handle Events.
if event::poll(std::time::Duration::from_millis(16))? {
if let event::Event::Key(key) = event::read()? {
match key.kind {
KeyEventKind::Press => match key.code {
KeyCode::F(5) => {
println!("Execute Next Instruction");
}
KeyCode::F(12) => {
println!("Resetting CPU");
}
_ => (),
},
_ => (),
}
if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('q') {
break;
}
}
}
}
// stdout().execute(LeaveAlternateScreen)?;
// disable_raw_mode()?;
Ok(())
}
#[cfg(test)]
mod test {
use crate::*;
#[test]
fn blank_screen_renders_to_text() {
let blank_data: [bool; CHIP8_VIDEO_MEMORY] = [false; CHIP8_VIDEO_MEMORY];
let blank_screen = (" ".repeat(CHIP8_VIDEO_WIDTH.try_into().unwrap()) + "\n")
.repeat(CHIP8_VIDEO_HEIGHT.try_into().unwrap());
assert_eq!(display_data_to_text_render(blank_data), blank_screen);
}
#[test]
fn filled_screen_renders_to_text() {
let filled_data: [bool; CHIP8_VIDEO_MEMORY] = [true; CHIP8_VIDEO_MEMORY];
let filled_screen = ("*".repeat(CHIP8_VIDEO_WIDTH.try_into().unwrap()) + "\n")
.repeat(CHIP8_VIDEO_HEIGHT.try_into().unwrap());
assert_eq!(display_data_to_text_render(filled_data), filled_screen);
}
#[test]
fn grid_pattern_renders_to_text() {
let mut grid_data: [bool; CHIP8_VIDEO_MEMORY] = [false; CHIP8_VIDEO_MEMORY];
let mut expected_data = String::new();
for i in 0..CHIP8_VIDEO_MEMORY {
grid_data[i] = (i % 2 == 0);
if i % 2 == 0 {
grid_data[i] = true;
expected_data += "*";
} else {
grid_data[i] = false;
expected_data += " ";
}
if (i as i32 % CHIP8_VIDEO_WIDTH as i32 == CHIP8_VIDEO_WIDTH - 1) {
expected_data += "\n";
}
}
assert_eq!(display_data_to_text_render(grid_data), expected_data);
}
}

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use crate::CHIP8_MEMORY_SIZE;
pub mod text_rendering;
pub const CHIP8FONT_0: [u8; 5] = [0xF0, 0x90, 0x90, 0x90, 0xF0];
pub const CHIP8FONT_1: [u8; 5] = [0x20, 0x60, 0x20, 0x20, 0x70];
pub const CHIP8FONT_2: [u8; 5] = [0xF0, 0x10, 0xF0, 0x80, 0xF0];
pub const CHIP8FONT_3: [u8; 5] = [0xF0, 0x10, 0xF0, 0x10, 0xF0];
pub const CHIP8FONT_4: [u8; 5] = [0x90, 0x90, 0xF0, 0x10, 0x10];
pub const CHIP8FONT_5: [u8; 5] = [0xF0, 0x80, 0xF0, 0x10, 0xF0];
pub const CHIP8FONT_6: [u8; 5] = [0xF0, 0x80, 0xF0, 0x90, 0xF0];
pub const CHIP8FONT_7: [u8; 5] = [0xF0, 0x10, 0x20, 0x40, 0x40];
pub const CHIP8FONT_8: [u8; 5] = [0xF0, 0x90, 0xF0, 0x90, 0xF0];
pub const CHIP8FONT_9: [u8; 5] = [0xF0, 0x90, 0xF0, 0x10, 0xF0];
pub const CHIP8FONT_A: [u8; 5] = [0xF0, 0x90, 0xF0, 0x90, 0x90];
pub const CHIP8FONT_B: [u8; 5] = [0xE0, 0x90, 0xE0, 0x90, 0xE0];
pub const CHIP8FONT_C: [u8; 5] = [0xF0, 0x80, 0x80, 0x80, 0xF0];
pub const CHIP8FONT_D: [u8; 5] = [0xE0, 0x90, 0x90, 0x90, 0xE0];
pub const CHIP8FONT_E: [u8; 5] = [0xF0, 0x80, 0xF0, 0x80, 0xF0];
pub const CHIP8FONT_F: [u8; 5] = [0xF0, 0x80, 0xF0, 0x80, 0x80];
pub fn load_fonts_into_memory(to_add_fonts_to: [u8; CHIP8_MEMORY_SIZE as usize])
-> [u8; CHIP8_MEMORY_SIZE as usize] {
let mut memory = to_add_fonts_to.clone();
let all_font_characters = [
CHIP8FONT_0,
CHIP8FONT_1,
CHIP8FONT_2,
CHIP8FONT_3,
CHIP8FONT_4,
CHIP8FONT_5,
CHIP8FONT_6,
CHIP8FONT_7,
CHIP8FONT_8,
CHIP8FONT_9,
CHIP8FONT_A,
CHIP8FONT_B,
CHIP8FONT_C,
CHIP8FONT_D,
CHIP8FONT_E,
CHIP8FONT_F,
];
for (font_index, current_font) in all_font_characters.iter().enumerate() {
for font_mem_offset in 0..=4 {
let real_offset = font_index * 5 + font_mem_offset;
memory[real_offset] = current_font[font_mem_offset];
}
}
memory
}

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use ratatui::{style::Stylize, widgets::{List, Paragraph}, Frame};
use crate::{AppState, Chip8CpuData, CHIP8_REGISTER_COUNT};
pub fn render_cpu_state(cpu_state: Chip8CpuData, frame: &mut Frame) {
let mut area = frame.area();
let mut current_state: Vec<String> = vec![];
current_state.push(format!("Delay Timer {:X}", cpu_state.delay_timer));
current_state.push(format!("Sound Timer {:X}", cpu_state.sound_timer));
current_state.push(format!("PC {:X}", cpu_state.pc));
for i in 0 .. CHIP8_REGISTER_COUNT {
current_state.push(format!("V{}: {}", i, cpu_state.registers[i as usize]));
}
frame.render_widget(
List::new(current_state).blue().on_white(), area)
}
pub fn render_menu_list(state: AppState, frame: &mut Frame) {
let mut area = frame.area();
frame.render_widget(List::new(state.menu_items).blue().on_white(), area);
}
pub fn render_hello_world(frame: &mut Frame) {
let area = frame.area();
frame.render_widget(
Paragraph::new("Hello Ratatui! (press 'q' to quit)")
.white()
.on_blue(),
area,
);
}

BIN
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93
resources/LICENSE-Dokdo.txt Normal file
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Copyright (c) 2005-2017 FONTRIX. All Rights Reserved.
This Font Software is licensed under the SIL Open Font License, Version 1.1.
This license is copied below, and is also available with a FAQ at:
http://scripts.sil.org/OFL
-----------------------------------------------------------
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
-----------------------------------------------------------
PREAMBLE
The goals of the Open Font License (OFL) are to stimulate worldwide
development of collaborative font projects, to support the font creation
efforts of academic and linguistic communities, and to provide a free and
open framework in which fonts may be shared and improved in partnership
with others.
The OFL allows the licensed fonts to be used, studied, modified and
redistributed freely as long as they are not sold by themselves. The
fonts, including any derivative works, can be bundled, embedded,
redistributed and/or sold with any software provided that any reserved
names are not used by derivative works. The fonts and derivatives,
however, cannot be released under any other type of license. The
requirement for fonts to remain under this license does not apply
to any document created using the fonts or their derivatives.
DEFINITIONS
"Font Software" refers to the set of files released by the Copyright
Holder(s) under this license and clearly marked as such. This may
include source files, build scripts and documentation.
"Reserved Font Name" refers to any names specified as such after the
copyright statement(s).
"Original Version" refers to the collection of Font Software components as
distributed by the Copyright Holder(s).
"Modified Version" refers to any derivative made by adding to, deleting,
or substituting -- in part or in whole -- any of the components of the
Original Version, by changing formats or by porting the Font Software to a
new environment.
"Author" refers to any designer, engineer, programmer, technical
writer or other person who contributed to the Font Software.
PERMISSION & CONDITIONS
Permission is hereby granted, free of charge, to any person obtaining
a copy of the Font Software, to use, study, copy, merge, embed, modify,
redistribute, and sell modified and unmodified copies of the Font
Software, subject to the following conditions:
1) Neither the Font Software nor any of its individual components,
in Original or Modified Versions, may be sold by itself.
2) Original or Modified Versions of the Font Software may be bundled,
redistributed and/or sold with any software, provided that each copy
contains the above copyright notice and this license. These can be
included either as stand-alone text files, human-readable headers or
in the appropriate machine-readable metadata fields within text or
binary files as long as those fields can be easily viewed by the user.
3) No Modified Version of the Font Software may use the Reserved Font
Name(s) unless explicit written permission is granted by the corresponding
Copyright Holder. This restriction only applies to the primary font name as
presented to the users.
4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
Software shall not be used to promote, endorse or advertise any
Modified Version, except to acknowledge the contribution(s) of the
Copyright Holder(s) and the Author(s) or with their explicit written
permission.
5) The Font Software, modified or unmodified, in part or in whole,
must be distributed entirely under this license, and must not be
distributed under any other license. The requirement for fonts to
remain under this license does not apply to any document created
using the Font Software.
TERMINATION
This license becomes null and void if any of the above conditions are
not met.
DISCLAIMER
THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
OTHER DEALINGS IN THE FONT SOFTWARE.

201
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@ -0,0 +1,201 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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