mirror of https://github.com/Ivsucram/ivsemu.git
Functions refactor
A small function refactor where we centralize things around the cpu. Also, now it is easier to create more instructions (for SC and OX) and link the decoded instruction with the correct emulated function.
This commit is contained in:
parent
26a1b85841
commit
5c90a93239
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@ -10,7 +10,10 @@ const DISPLAY_HEIGHT: usize = 32;
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const DISPLAY_SCALE: u32 = 10;
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pub struct ProgramCounter(usize);
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pub struct Registers([u8; 0x10]);
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pub struct Registers{
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x_0: u8, x_1: u8, x_2: u8, x_3: u8, x_4: u8, x_5: u8, x_6: u8, x_7: u8,
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x_8: u8, x_9: u8, x_a: u8, x_b: u8, x_c: u8, x_d: u8, x_e: u8, x_f: u8
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}
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pub struct Ram([u8; 4 * 1024]);
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pub struct DisplayBuffer([[bool; DISPLAY_HEIGHT]; DISPLAY_WIDTH]);
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@ -21,16 +24,21 @@ pub struct Timer{
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}
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pub struct Keypad {
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keys: [bool; 0x10],
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// layout: String
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key_status: [bool; 0x10],
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keys: std::collections::HashMap<sdl2::keyboard::Keycode, usize>
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}
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pub struct OpCodes {
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opcode: u16,
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nible_1: u8,
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nible_2: u8,
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nible_3: u8,
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nible_4: u8
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n1: u8,
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n2: u8,
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n3: u8,
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n4: u8,
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x: usize,
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y: usize,
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n: u8,
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nn: u8,
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nnn: usize
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}
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impl ProgramCounter {
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@ -60,16 +68,31 @@ impl ProgramCounter {
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impl Registers {
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fn init() -> Registers {
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Registers {
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0: [0x0; 16]
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x_0: 0, x_1: 0, x_2: 0, x_3: 0, x_4: 0, x_5: 0, x_6: 0, x_7: 0,
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x_8: 0, x_9: 0, x_a: 0, x_b: 0, x_c: 0, x_d: 0, x_e: 0, x_f: 0
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}
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}
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fn get(&self, register: usize) -> u8 {
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self.0[register]
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assert!(register <= 0xF);
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match register {
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0x0 => self.x_0, 0x1 => self.x_1, 0x2 => self.x_2, 0x3 => self.x_3,
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0x4 => self.x_4, 0x5 => self.x_5, 0x6 => self.x_6, 0x7 => self.x_7,
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0x8 => self.x_8, 0x9 => self.x_9, 0xA => self.x_a, 0xB => self.x_b,
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0xC => self.x_c, 0xD => self.x_d, 0xE => self.x_e, 0xF => self.x_f,
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_ => 0
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}
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}
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fn set(&mut self, register: usize, value: u8) {
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self.0[register] = value;
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assert!(register <= 0xF);
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match register {
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0x0 => self.x_0 = value, 0x1 => self.x_1 = value, 0x2 => self.x_2 = value, 0x3 => self.x_3 = value,
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0x4 => self.x_4 = value, 0x5 => self.x_5 = value, 0x6 => self.x_6 = value, 0x7 => self.x_7 = value,
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0x8 => self.x_8 = value, 0x9 => self.x_9 = value, 0xA => self.x_a = value, 0xB => self.x_b = value,
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0xC => self.x_c = value, 0xD => self.x_d = value, 0xE => self.x_e = value, 0xF => self.x_f = value,
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_ => {}
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}
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}
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}
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@ -165,61 +188,53 @@ impl Timer {
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impl Keypad {
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fn init() -> Keypad {
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Keypad {
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keys: [false; 0x10],
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// layout: String::from("123C456D789EA0BF")
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key_status: [false; 0x10],
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keys: [(sdl2::keyboard::Keycode::Num1, 0x1),
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(sdl2::keyboard::Keycode::Num2, 0x2),
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(sdl2::keyboard::Keycode::Num3, 0x3),
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(sdl2::keyboard::Keycode::Num4, 0xC),
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(sdl2::keyboard::Keycode::Q, 0x4),
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(sdl2::keyboard::Keycode::W, 0x5),
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(sdl2::keyboard::Keycode::E, 0x6),
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(sdl2::keyboard::Keycode::R, 0xD),
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(sdl2::keyboard::Keycode::A, 0x7),
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(sdl2::keyboard::Keycode::S, 0x8),
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(sdl2::keyboard::Keycode::D, 0x9),
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(sdl2::keyboard::Keycode::F, 0xE),
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(sdl2::keyboard::Keycode::Z, 0xA),
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(sdl2::keyboard::Keycode::X, 0x0),
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(sdl2::keyboard::Keycode::C, 0xB),
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(sdl2::keyboard::Keycode::V, 0xF)
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].iter().cloned().collect()
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}
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}
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fn compute_keycode(&self, keycode: sdl2::keyboard::Keycode) -> Option<usize> {
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match keycode {
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sdl2::keyboard::Keycode::Num1 => Some(0x1),
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sdl2::keyboard::Keycode::Num2 => Some(0x2),
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sdl2::keyboard::Keycode::Num3 => Some(0x3),
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sdl2::keyboard::Keycode::Num4 => Some(0xC),
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sdl2::keyboard::Keycode::Q => Some(0x4),
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sdl2::keyboard::Keycode::W => Some(0x5),
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sdl2::keyboard::Keycode::E => Some(0x6),
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sdl2::keyboard::Keycode::R => Some(0xD),
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sdl2::keyboard::Keycode::A => Some(0x7),
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sdl2::keyboard::Keycode::S => Some(0x8),
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sdl2::keyboard::Keycode::D => Some(0x9),
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sdl2::keyboard::Keycode::F => Some(0xE),
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sdl2::keyboard::Keycode::Z => Some(0xA),
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sdl2::keyboard::Keycode::X => Some(0x0),
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sdl2::keyboard::Keycode::C => Some(0xB),
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sdl2::keyboard::Keycode::V => Some(0xF),
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_ => Option::None,
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match self.keys.get(&keycode) {
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Some(chip8_key) => Some(*chip8_key),
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None => None
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}
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}
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// fn set_layout(&mut self, layout: &str) {
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// assert_eq!(layout.len(), self.layout.len());
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// self.layout = layout.to_string();
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// }
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fn get(&mut self, pos: usize) -> bool {
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self.keys[pos]
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self.key_status[pos]
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}
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fn being_pressed(&self) -> u8 {
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fn being_pressed(&self) -> Option<u8> {
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for key in 0x0..0x10 {
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if self.keys[key] {
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return key as u8
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if self.key_status[key] {
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return Some(key as u8)
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}
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}
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return 0x10
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None
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}
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fn press(&mut self, key: usize) {
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self.keys[key] = true;
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self.key_status[key] = true;
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}
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fn release(&mut self, key: usize) {
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self.keys[key] = false;
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self.key_status[key] = false;
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}
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}
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@ -237,34 +252,26 @@ impl DisplayBuffer {
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impl OpCodes {
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fn init(opcode: u16) -> OpCodes {
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let n1 = (opcode & 0xF000) >> 12;
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let n2 = (opcode & 0xF00) >> 8;
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let n3 = (opcode & 0xF0) >> 4;
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let n4 = opcode & 0xF;
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let nn = opcode & 0xFF;
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let nnn = opcode & 0xFFF;
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OpCodes {
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opcode: opcode,
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nible_1: ((opcode & 0xF000) >> 12) as u8,
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nible_2: ((opcode & 0x0F00) >> 8) as u8,
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nible_3: ((opcode & 0x00F0) >> 4) as u8,
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nible_4: (opcode & 0x000F) as u8
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n1: n1 as u8,
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n2: n2 as u8,
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n3: n3 as u8,
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n4: n4 as u8,
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x: n2 as usize,
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y: n3 as usize,
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n: n4 as u8,
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nn: nn as u8,
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nnn: nnn as usize
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}
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}
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fn get_x(&self) -> usize {
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self.nible_2 as usize
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}
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fn get_y(&self) -> usize {
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self.nible_3 as usize
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}
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fn get_nnn(&self) -> u16 {
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self.opcode & 0xFFF
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}
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fn get_nn(&self) -> u8 {
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(self.opcode & 0xFF) as u8
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}
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fn get_n(&self) -> u8 {
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(self.opcode & 0xF) as u8
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}
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}
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}
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struct CPU {
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@ -277,7 +284,10 @@ struct CPU {
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registers: Registers,
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ram: Ram,
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keypad: Keypad,
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display_buffer: DisplayBuffer
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display_buffer: DisplayBuffer,
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opcode: OpCodes,
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str_to_hex_map: std::collections::HashMap<char, Option<u8>>
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}
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impl CPU {
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@ -292,7 +302,81 @@ impl CPU {
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registers: Registers::init(),
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ram: Ram::init(),
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keypad: Keypad::init(),
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display_buffer: DisplayBuffer::init()
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display_buffer: DisplayBuffer::init(),
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opcode: OpCodes::init(0000),
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str_to_hex_map: [('0', Some(0x0)), ('1', Some(0x1)), ('2', Some(0x2)), ('3', Some(0x3)),
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('4', Some(0x4)), ('5', Some(0x5)), ('6', Some(0x6)), ('7', Some(0x7)),
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('8', Some(0x8)), ('9', Some(0x9)), ('A', Some(0xA)), ('B', Some(0xB)),
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('C', Some(0xC)), ('D', Some(0xD)), ('E', Some(0xE)), ('F', Some(0xF)),
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('?', None)].iter().cloned().collect()
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}
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}
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fn fetch(&mut self) {
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self.opcode = OpCodes::init(self.ram.read16(self.pc.get()));
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self.pc.increase();
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}
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fn decode(&mut self) {
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if self.decode_match("00E0") { op_00e0(self);
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} else if self.decode_match("1???") { op_1nnn(self);
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} else if self.decode_match("00EE") { op_00ee(self);
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} else if self.decode_match("2???") { op_2nnn(self);
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} else if self.decode_match("3???") { op_3xnn(self);
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} else if self.decode_match("4???") { op_4xnn(self);
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} else if self.decode_match("5??0") { op_5xy0(self);
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} else if self.decode_match("9??0") { op_9xy0(self);
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} else if self.decode_match("6???") { op_6xnn(self);
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} else if self.decode_match("7???") { op_7xnn(self);
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} else if self.decode_match("8??0") { op_8xy0(self);
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} else if self.decode_match("8??1") { op_8xy1(self);
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} else if self.decode_match("8??2") { op_8xy2(self);
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} else if self.decode_match("8??3") { op_8xy3(self);
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} else if self.decode_match("8??4") { op_8xy4(self);
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} else if self.decode_match("8??5") { op_8xy5(self);
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} else if self.decode_match("8??6") { op_8xy6(self);
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} else if self.decode_match("8??7") { op_8xy7(self);
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} else if self.decode_match("8??E") { op_8xye(self);
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} else if self.decode_match("A???") { op_annn(self);
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} else if self.decode_match("B???") { op_bnnn(self);
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} else if self.decode_match("C???") { op_cxnn(self);
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} else if self.decode_match("D???") { op_dxyn(self);
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} else if self.decode_match("E?9E") { op_ex9e(self);
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} else if self.decode_match("E?A1") { op_exa1(self);
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} else if self.decode_match("F??7") { op_fx07(self);
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} else if self.decode_match("F?15") { op_fx15(self);
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} else if self.decode_match("F?18") { op_fx18(self);
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} else if self.decode_match("F?1E") { op_fx1e(self);
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} else if self.decode_match("F?0A") { op_fx0a(self);
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} else if self.decode_match("F?29") { op_fx29(self);
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} else if self.decode_match("F?33") { op_fx33(self);
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} else if self.decode_match("F?55") { op_fx55(self);
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} else if self.decode_match("F?65") { op_fx65(self);
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} else {
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println!{"Unknown instruction: {:04x}", self.opcode.opcode};
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}
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}
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fn decode_match(&self, hex_code: &str) -> bool {
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let mut res: bool = true;
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for (i, c) in hex_code.chars().enumerate() {
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match self.str_to_hex_map.get(&c) {
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Some(Some(hex)) => res = res && self.compare_nibble(i, &hex),
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Some(None) => res = res && true,
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_ => res = res && false
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}
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}
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res
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}
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fn compare_nibble(&self, pos: usize, nibble: &u8) -> bool{
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match pos {
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0 => *nibble == self.opcode.n1,
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1 => *nibble == self.opcode.n2,
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2 => *nibble == self.opcode.n3,
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3 => *nibble == self.opcode.n4,
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_ => false
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}
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}
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}
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@ -301,15 +385,23 @@ pub fn run() {
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let mut cpu = CPU::init();
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cpu.ram.init_fonts();
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// load_rom("src/chip_8/roms/ibm_logo.ch8", &mut cpu);
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load_rom("src/chip_8/roms/BC_test.ch8", &mut cpu);
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// load_rom("src/chip_8/roms/BC_test.ch8", &mut cpu);
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// load_rom("src/chip_8/roms/Keypad_Test_Hap_2006.ch8", &mut cpu);
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// load_rom("src/chip_8/roms/Trip8 Demo (2008) [Revival Studios].ch8", &mut cpu);
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// load_rom("src/chip_8/roms/Zero Demo [zeroZshadow, 2007].ch8", &mut cpu);
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// load_rom("src/chip_8/roms/Particle Demo [zeroZshadow, 2008].ch8", &mut cpu);
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// load_rom("src/chip_8/roms/Sierpinski [Sergey Naydenov, 2010].ch8", &mut cpu);
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// load_rom("src/chip_8/roms/Chip8 emulator Logo [Garstyciuks].ch8", &mut cpu);
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// load_rom("src/chip_8/roms/Stars [Sergey Naydenov, 2010].ch8", &mut cpu);
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// load_rom("src/chip_8/roms/test_opcode.ch8", &mut cpu);
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// load_rom("src/chip_8/roms/HIDDEN.ch8", &mut cpu); // Good to test keyboard
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// load_rom("src/chip_8/roms/CAVE.ch8", &mut cpu); // Good to test keyboard
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load_rom("src/chip_8/roms/CAVE.ch8", &mut cpu); // Good to test keyboard
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// load_rom("src/chip_8/roms/TRON.ch8", &mut cpu); // Good to test keyboard
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// load_rom("src/chip_8/roms/PUZZLE.ch8", &mut cpu); // Good to test keyboard?
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// load_rom("src/chip_8/roms/TETRIS.ch8", &mut cpu); // Good to test keyboard?
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// load_rom("src/chip_8/roms/delay_timer_test.ch8", &mut cpu);
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// load_rom("src/chip_8/roms/random_number_test.ch8", &mut cpu);
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// load_rom("src/chip_8/roms/SNAKE.ch8", &mut cpu);
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let sdl_context = sdl2::init().unwrap();
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let mut display = crate::chip_8::display::Display::init(&sdl_context, DISPLAY_SCALE);
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@ -332,6 +424,10 @@ pub fn run() {
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println!("Decreasing cpu clock from {} Hz to {} Hz", cpu.clock.clock_hz, cpu.clock.clock_hz - 10);
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cpu.clock.clock_hz -= 10;
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},
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sdl2::event::Event::KeyDown {
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keycode: Some(sdl2::keyboard::Keycode::Backspace), .. } => {
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cpu.pc.set(0x200);
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},
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sdl2::event::Event::KeyDown { keycode: Some(keycode), ..} => {
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if let Some(key_index) = cpu.keypad.compute_keycode(keycode) {
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cpu.keypad.press(key_index);
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@ -349,9 +445,9 @@ pub fn run() {
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cpu.delay_timer.tick();
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cpu.sound_timer.tick();
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if cpu.clock.tick() {
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let opcode = OpCodes::init(fetch(&mut cpu));
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decode(&opcode, &mut cpu);
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if opcode.nible_1 == 0xD {
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cpu.fetch();
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cpu.decode();
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if cpu.decode_match("D???") {
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display.draw(&cpu.display_buffer.0)
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}
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}
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@ -366,104 +462,17 @@ fn load_rom(filename: &str, cpu: &mut CPU) {
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cpu.ram.load_rom(&buffer);
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}
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fn fetch(cpu: &mut CPU) -> u16 {
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let opcode = cpu.ram.read16(cpu.pc.get());
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cpu.pc.increase();
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opcode
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}
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fn decode(opcode: &OpCodes, cpu: &mut CPU) {
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if opcode.opcode == 0x00E0 {
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op_00e0(cpu);
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} else if opcode.nible_1 == 0x1 {
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op1nnn(cpu, opcode.get_nnn() as usize);
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} else if opcode.opcode == 0x00EE {
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op00ee(cpu);
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} else if opcode.nible_1 == 0x2 {
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op2nnn(cpu, opcode.get_nnn() as usize);
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} else if opcode.nible_1 == 0x3 {
|
||||
op3xnn(cpu, opcode.get_x(), opcode.get_nn());
|
||||
} else if opcode.nible_1 == 0x4 {
|
||||
op4xnn(cpu, opcode.get_x(), opcode.get_nn());
|
||||
} else if opcode.nible_1 == 0x5 {
|
||||
op5xy0(cpu, opcode.get_x(), opcode.get_y());
|
||||
} else if opcode.nible_1 == 0x9 {
|
||||
op9xy0(cpu, opcode.get_x(), opcode.get_y());
|
||||
} else if opcode.nible_1 == 0x6 {
|
||||
op6xnn(cpu, opcode.get_x(), opcode.get_nn());
|
||||
} else if opcode.nible_1 == 0x7 {
|
||||
op7xnn(cpu, opcode.get_x(), opcode.get_nn());
|
||||
} else if opcode.nible_1 == 0x8 && opcode.nible_4 == 0x0 {
|
||||
op8xy0(cpu, opcode.get_x(), opcode.get_y());
|
||||
} else if opcode.nible_1 == 0x8 && opcode.nible_4 == 0x1 {
|
||||
op8xy1(cpu, opcode.get_x(), opcode.get_y());
|
||||
} else if opcode.nible_1 == 0x8 && opcode.nible_4 == 0x2 {
|
||||
op8xy2(cpu, opcode.get_x(), opcode.get_y());
|
||||
} else if opcode.nible_1 == 0x8 && opcode.nible_4 == 0x3 {
|
||||
op8xy3(cpu, opcode.get_x(), opcode.get_y());
|
||||
} else if opcode.nible_1 == 0x8 && opcode.nible_4 == 0x4 {
|
||||
op8xy4(cpu, opcode.get_x(), opcode.get_y());
|
||||
} else if opcode.nible_1 == 0x8 && opcode.nible_4 == 0x5 {
|
||||
op8xy5(cpu, opcode.get_x(), opcode.get_y());
|
||||
} else if opcode.nible_1 == 0x8 && opcode.nible_4 == 0x6 {
|
||||
op8xy6(cpu, opcode.get_x(), opcode.get_y());
|
||||
} else if opcode.nible_1 == 0x8 && opcode.nible_4 == 0x7 {
|
||||
op8xy7(cpu, opcode.get_x(), opcode.get_y());
|
||||
} else if opcode.nible_1 == 0x8 && opcode.nible_4 == 0xE {
|
||||
op8xye(cpu, opcode.get_x(), opcode.get_y());
|
||||
} else if opcode.nible_1 == 0xA {
|
||||
opannn(cpu, opcode.get_nnn() as usize);
|
||||
} else if opcode.nible_1 == 0xB {
|
||||
opbnnn(cpu, opcode.get_nnn() as usize);
|
||||
} else if opcode.nible_1 == 0xC {
|
||||
opcxnn(cpu, opcode.get_x(), opcode.get_nn());
|
||||
} else if opcode.nible_1 == 0xD {
|
||||
opdxyn(cpu, opcode.get_x(), opcode.get_y(), opcode.get_n());
|
||||
} else if opcode.nible_1 == 0xE && opcode.nible_3 == 0x9 && opcode.nible_4 == 0xE {
|
||||
opex9e(cpu, opcode.get_x());
|
||||
} else if opcode.nible_1 == 0xE && opcode.nible_3 == 0x9 && opcode.nible_4 == 0xE {
|
||||
opex9e(cpu, opcode.get_x());
|
||||
} else if opcode.nible_1 == 0xE && opcode.nible_3 == 0xA && opcode.nible_4 == 0x1 {
|
||||
opexa1(cpu, opcode.get_x());
|
||||
} else if opcode.nible_1 == 0xF && opcode.nible_3 == 0x0 && opcode.nible_4 == 0x7 {
|
||||
opfx07(cpu, opcode.get_x());
|
||||
} else if opcode.nible_1 == 0xF && opcode.nible_3 == 0x1 && opcode.nible_4 == 0x5 {
|
||||
opfx15(cpu, opcode.get_x());
|
||||
} else if opcode.nible_1 == 0xF && opcode.nible_3 == 0x1 && opcode.nible_4 == 0x8 {
|
||||
opfx18(cpu, opcode.get_x());
|
||||
} else if opcode.nible_1 == 0xF && opcode.nible_3 == 0x1 && opcode.nible_4 == 0xE {
|
||||
opfx1e(cpu, opcode.get_x());
|
||||
} else if opcode.nible_1 == 0xF && opcode.nible_3 == 0x0 && opcode.nible_4 == 0xA {
|
||||
opfx0a(cpu, opcode.get_x());
|
||||
} else if opcode.nible_1 == 0xF && opcode.nible_3 == 0x2 && opcode.nible_4 == 0x9 {
|
||||
opfx29(cpu, opcode.get_x());
|
||||
} else if opcode.nible_1 == 0xF && opcode.nible_3 == 0x3 && opcode.nible_4 == 0x3 {
|
||||
opfx33(cpu, opcode.get_x());
|
||||
} else if opcode.nible_1 == 0xF && opcode.nible_3 == 0x5 && opcode.nible_4 == 0x5 {
|
||||
opfx55(cpu, opcode.get_x());
|
||||
} else if opcode.nible_1 == 0xF && opcode.nible_3 == 0x6 && opcode.nible_4 == 0x5 {
|
||||
opfx65(cpu, opcode.get_x());
|
||||
} else {
|
||||
println!{"Unknown instruction: {:04x}", opcode.opcode};
|
||||
}
|
||||
}
|
||||
// fn execute() {}
|
||||
|
||||
// fn op_0NNN() {}//ignore
|
||||
|
||||
// CLS
|
||||
// Clear the display, turning all pixels off
|
||||
fn op_00e0(cpu: &mut CPU) {
|
||||
cpu.display_buffer.clear();
|
||||
}
|
||||
|
||||
// JMP
|
||||
// Set PC to NNN, causing the program to jump to that memory location
|
||||
fn op1nnn(cpu: &mut CPU, value: usize) {
|
||||
cpu.pc.set(value);
|
||||
fn op_1nnn(cpu: &mut CPU) {
|
||||
cpu.pc.set(cpu.opcode.nnn);
|
||||
}
|
||||
|
||||
fn op00ee(cpu: &mut CPU) {
|
||||
fn op_00ee(cpu: &mut CPU) {
|
||||
let value = cpu.stack.pop();
|
||||
match value {
|
||||
Some(value) => {
|
||||
|
|
@ -473,132 +482,120 @@ fn op00ee(cpu: &mut CPU) {
|
|||
}
|
||||
}
|
||||
|
||||
fn op2nnn(cpu: &mut CPU, value: usize) {
|
||||
fn op_2nnn(cpu: &mut CPU) {
|
||||
cpu.stack.push(cpu.pc.get());
|
||||
cpu.pc.set(value);
|
||||
cpu.pc.set(cpu.opcode.nnn);
|
||||
}
|
||||
|
||||
fn op3xnn(cpu: &mut CPU, register_x: usize, value: u8) {
|
||||
if cpu.registers.get(register_x) == value {
|
||||
fn op_3xnn(cpu: &mut CPU) {
|
||||
if cpu.registers.get(cpu.opcode.x) == cpu.opcode.nn {
|
||||
cpu.pc.increase();
|
||||
}
|
||||
}
|
||||
|
||||
fn op4xnn(cpu: &mut CPU, register_x: usize, value: u8) {
|
||||
if cpu.registers.get(register_x) != value {
|
||||
fn op_4xnn(cpu: &mut CPU) {
|
||||
if cpu.registers.get(cpu.opcode.x) != cpu.opcode.nn {
|
||||
cpu.pc.increase();
|
||||
}
|
||||
}
|
||||
|
||||
fn op5xy0(cpu: &mut CPU, register_x: usize, register_y: usize) {
|
||||
if cpu.registers.get(register_x) == cpu.registers.get(register_y) {
|
||||
fn op_5xy0(cpu: &mut CPU) {
|
||||
if cpu.registers.get(cpu.opcode.x) == cpu.registers.get(cpu.opcode.y) {
|
||||
cpu.pc.increase();
|
||||
}
|
||||
}
|
||||
|
||||
fn op9xy0(cpu: &mut CPU, register_x: usize, register_y: usize) {
|
||||
if cpu.registers.get(register_x) != cpu.registers.get(register_y) {
|
||||
fn op_9xy0(cpu: &mut CPU) {
|
||||
if cpu.registers.get(cpu.opcode.x) != cpu.registers.get(cpu.opcode.y) {
|
||||
cpu.pc.increase();
|
||||
}
|
||||
}
|
||||
|
||||
// SET
|
||||
// Set the register VX to the value NN
|
||||
fn op6xnn(cpu: &mut CPU, register: usize, value: u8) {
|
||||
cpu.registers.set(register, value);
|
||||
fn op_6xnn(cpu: &mut CPU) {
|
||||
cpu.registers.set(cpu.opcode.x, cpu.opcode.nn);
|
||||
}
|
||||
|
||||
// ADD
|
||||
// Add the value NN to VX. VF is ignored
|
||||
fn op7xnn(cpu: &mut CPU, register: usize, value: u8) {
|
||||
let nn = value as u16;
|
||||
let vx = cpu.registers.get(register) as u16;
|
||||
let value = (nn + vx) & 0xFF;
|
||||
let value = value as u8;
|
||||
cpu.registers.set(register, value);
|
||||
fn op_7xnn(cpu: &mut CPU) {
|
||||
let vx = cpu.registers.get(cpu.opcode.x);
|
||||
cpu.registers.set(cpu.opcode.x, cpu.opcode.nn.wrapping_add(vx));
|
||||
}
|
||||
|
||||
fn op8xy0(cpu: &mut CPU, register_x: usize, register_y: usize) {
|
||||
cpu.registers.set(register_x, cpu.registers.get(register_y));
|
||||
fn op_8xy0(cpu: &mut CPU) {
|
||||
let vy = cpu.registers.get(cpu.opcode.y);
|
||||
cpu.registers.set(cpu.opcode.x, vy);
|
||||
}
|
||||
|
||||
fn op8xy1(cpu: &mut CPU, register_x: usize, register_y: usize) {
|
||||
let vx = cpu.registers.get(register_x);
|
||||
let vy = cpu.registers.get(register_y);
|
||||
cpu.registers.set(register_x, vx | vy);
|
||||
fn op_8xy1(cpu: &mut CPU) {
|
||||
let vx = cpu.registers.get(cpu.opcode.x);
|
||||
let vy = cpu.registers.get(cpu.opcode.y);
|
||||
cpu.registers.set(cpu.opcode.x, vx | vy);
|
||||
}
|
||||
|
||||
fn op8xy2(cpu: &mut CPU, register_x: usize, register_y: usize) {
|
||||
let vx = cpu.registers.get(register_x);
|
||||
let vy = cpu.registers.get(register_y);
|
||||
cpu.registers.set(register_x, vx & vy);
|
||||
fn op_8xy2(cpu: &mut CPU) {
|
||||
let vx = cpu.registers.get(cpu.opcode.x);
|
||||
let vy = cpu.registers.get(cpu.opcode.y);
|
||||
cpu.registers.set(cpu.opcode.x, vx & vy);
|
||||
}
|
||||
|
||||
fn op8xy3(cpu: &mut CPU, register_x: usize, register_y: usize) {
|
||||
let vx = cpu.registers.get(register_x);
|
||||
let vy = cpu.registers.get(register_y);
|
||||
cpu.registers.set(register_x, vx ^ vy);
|
||||
fn op_8xy3(cpu: &mut CPU) {
|
||||
let vx = cpu.registers.get(cpu.opcode.x);
|
||||
let vy = cpu.registers.get(cpu.opcode.y);
|
||||
cpu.registers.set(cpu.opcode.x, vx ^ vy);
|
||||
}
|
||||
|
||||
fn op8xy4(cpu: &mut CPU, register_x: usize, register_y: usize) {
|
||||
let vx = cpu.registers.get(register_x) as u16;
|
||||
let vy = cpu.registers.get(register_y) as u16;
|
||||
let value = (vx + vy) & 0xFF;
|
||||
cpu.registers.set(register_x, value as u8);
|
||||
fn op_8xy4(cpu: &mut CPU) {
|
||||
let vx = cpu.registers.get(cpu.opcode.x);
|
||||
let vy = cpu.registers.get(cpu.opcode.y);
|
||||
cpu.registers.set(cpu.opcode.x, vx.wrapping_add(vy));
|
||||
}
|
||||
|
||||
fn op8xy5(cpu: &mut CPU, register_x: usize, register_y: usize) {
|
||||
let vx = cpu.registers.get(register_x);
|
||||
let vy = cpu.registers.get(register_y);
|
||||
cpu.registers.set(register_x, vx.wrapping_sub(vy));
|
||||
cpu.registers.set(0xF, if vx > vy {1} else {0});
|
||||
fn op_8xy5(cpu: &mut CPU) {
|
||||
let vx = cpu.registers.get(cpu.opcode.x);
|
||||
let vy = cpu.registers.get(cpu.opcode.y);
|
||||
cpu.registers.set(cpu.opcode.x, vx.wrapping_sub(vy));
|
||||
cpu.registers.x_f = if vx > vy {1} else {0};
|
||||
}
|
||||
|
||||
fn op8xy6(cpu: &mut CPU, register_x: usize, register_y: usize) {
|
||||
let vy = cpu.registers.get(register_y);
|
||||
let vx = cpu.registers.get(register_x);
|
||||
cpu.registers.set(register_x, vy >> 1);
|
||||
cpu.registers.set(0xF, vx & 0x1);
|
||||
fn op_8xy6(cpu: &mut CPU) {
|
||||
let vy = cpu.registers.get(cpu.opcode.x);
|
||||
let vx = cpu.registers.get(cpu.opcode.y);
|
||||
cpu.registers.set(cpu.opcode.x, vy >> 1);
|
||||
cpu.registers.x_f = vx & 0x1;
|
||||
}
|
||||
|
||||
fn op8xy7(cpu: &mut CPU, register_x: usize, register_y: usize) {
|
||||
let vx = cpu.registers.get(register_x);
|
||||
let vy = cpu.registers.get(register_y);
|
||||
cpu.registers.set(register_x, vy.wrapping_sub(vx));
|
||||
cpu.registers.set(0xF, if vy > vx {1} else {0});
|
||||
fn op_8xy7(cpu: &mut CPU) {
|
||||
let vx = cpu.registers.get(cpu.opcode.x);
|
||||
let vy = cpu.registers.get(cpu.opcode.y);
|
||||
cpu.registers.set(cpu.opcode.x, vy.wrapping_sub(vx));
|
||||
cpu.registers.x_f = if vy > vx {1} else {0};
|
||||
}
|
||||
|
||||
fn op8xye(cpu: &mut CPU, register_x: usize, register_y: usize) {
|
||||
let vy = cpu.registers.get(register_y);
|
||||
let vx = cpu.registers.get(register_x);
|
||||
cpu.registers.set(register_x, vy << 1);
|
||||
cpu.registers.set(0xF, (vx & 0x80) >> 7);
|
||||
fn op_8xye(cpu: &mut CPU) {
|
||||
let vx = cpu.registers.get(cpu.opcode.x);
|
||||
let vy = cpu.registers.get(cpu.opcode.y);
|
||||
cpu.registers.set(cpu.opcode.x, vy << 1);
|
||||
cpu.registers.x_f = (vx & 0x80) >> 7;
|
||||
|
||||
}
|
||||
|
||||
// IND
|
||||
// Set index register I to the value NNN
|
||||
fn opannn(cpu: &mut CPU, value: usize) {
|
||||
cpu.index_register = value;
|
||||
fn op_annn(cpu: &mut CPU) {
|
||||
cpu.index_register = cpu.opcode.nnn;
|
||||
}
|
||||
|
||||
fn opbnnn(cpu: &mut CPU, value: usize) {
|
||||
let v0 = cpu.registers.get(0x0) as usize;
|
||||
cpu.pc.set(value + v0);
|
||||
fn op_bnnn(cpu: &mut CPU) {
|
||||
cpu.pc.set(cpu.opcode.nnn + cpu.registers.x_0 as usize);
|
||||
}
|
||||
|
||||
fn opcxnn(cpu: &mut CPU, register_x: usize, value: u8) {
|
||||
fn op_cxnn(cpu: &mut CPU) {
|
||||
let mut rng = rand::thread_rng();
|
||||
cpu.registers.set(register_x,rng.gen_range(0x0..0xFF) & value);
|
||||
cpu.registers.set(cpu.opcode.x, rng.gen_range(0x0..0xFF) & cpu.opcode.nn);
|
||||
}
|
||||
|
||||
// DIS
|
||||
// Display
|
||||
fn opdxyn(cpu: &mut CPU, register_x: usize, register_y: usize, value: u8) {
|
||||
fn op_dxyn(cpu: &mut CPU) {
|
||||
let mut vf: bool = false;
|
||||
let value = value as usize;
|
||||
let ori_x = cpu.registers.get(register_x) as usize % DISPLAY_WIDTH;
|
||||
let ori_y = cpu.registers.get(register_y) as usize % DISPLAY_HEIGHT;
|
||||
let value = cpu.opcode.n as usize;
|
||||
let ori_x = cpu.registers.get(cpu.opcode.x) as usize % DISPLAY_WIDTH;
|
||||
let ori_y = cpu.registers.get(cpu.opcode.y) as usize % DISPLAY_HEIGHT;
|
||||
|
||||
for row in 0..value {
|
||||
let y = ori_y + row;
|
||||
|
|
@ -619,69 +616,66 @@ fn opdxyn(cpu: &mut CPU, register_x: usize, register_y: usize, value: u8) {
|
|||
vf = (memory_pixel && display_pixel) || vf;
|
||||
}
|
||||
}
|
||||
cpu.registers.set(0xF, if vf {1} else {0});
|
||||
cpu.registers.x_f = if vf {1} else {0};
|
||||
}
|
||||
|
||||
fn opex9e(cpu: &mut CPU, register_x: usize) {
|
||||
if cpu.keypad.get(cpu.registers.get(register_x) as usize) {
|
||||
fn op_ex9e(cpu: &mut CPU) {
|
||||
if cpu.keypad.get(cpu.registers.get(cpu.opcode.x) as usize) {
|
||||
cpu.pc.increase();
|
||||
}
|
||||
}
|
||||
|
||||
fn opexa1(cpu: &mut CPU, register_x: usize) {
|
||||
if !cpu.keypad.get(cpu.registers.get(register_x) as usize) {
|
||||
fn op_exa1(cpu: &mut CPU) {
|
||||
if !cpu.keypad.get(cpu.registers.get(cpu.opcode.x) as usize) {
|
||||
cpu.pc.increase();
|
||||
}
|
||||
}
|
||||
|
||||
fn opfx07(cpu: &mut CPU, register_x: usize) {
|
||||
cpu.registers.set(register_x, cpu.delay_timer.tick);
|
||||
fn op_fx07(cpu: &mut CPU) {
|
||||
cpu.registers.set(cpu.opcode.x, cpu.delay_timer.tick);
|
||||
}
|
||||
|
||||
fn opfx15(cpu: &mut CPU, register_x: usize) {
|
||||
cpu.delay_timer.tick = cpu.registers.get(register_x);
|
||||
fn op_fx15(cpu: &mut CPU) {
|
||||
cpu.delay_timer.tick = cpu.registers.get(cpu.opcode.x);
|
||||
}
|
||||
|
||||
fn opfx18(cpu: &mut CPU, register_x: usize) {
|
||||
cpu.sound_timer.tick = cpu.registers.get(register_x);
|
||||
fn op_fx18(cpu: &mut CPU) {
|
||||
cpu.sound_timer.tick = cpu.registers.get(cpu.opcode.x);
|
||||
}
|
||||
|
||||
fn opfx1e(cpu: &mut CPU, register_x: usize) {
|
||||
cpu.index_register += cpu.registers.get(register_x) as usize;
|
||||
fn op_fx1e(cpu: &mut CPU) {
|
||||
cpu.index_register += cpu.registers.get(cpu.opcode.x) as usize;
|
||||
}
|
||||
|
||||
fn opfx0a(cpu: &mut CPU, register_x: usize) {
|
||||
if cpu.keypad.being_pressed() == 0x10 {
|
||||
cpu.pc.decrement();
|
||||
} else {
|
||||
cpu.registers.set(register_x, cpu.keypad.being_pressed());
|
||||
fn op_fx0a(cpu: &mut CPU) {
|
||||
match cpu.keypad.being_pressed() {
|
||||
Some(key) => { cpu.registers.set(cpu.opcode.x, key); },
|
||||
_ => { cpu.pc.decrement(); }
|
||||
}
|
||||
}
|
||||
|
||||
fn opfx29(cpu: &mut CPU, register_x: usize) {
|
||||
let char = (cpu.registers.get(register_x) & 0xF) as usize;
|
||||
fn op_fx29(cpu: &mut CPU) {
|
||||
let char = (cpu.registers.get(cpu.opcode.x) & 0xF) as usize;
|
||||
cpu.index_register = 0x50 + char * 5;
|
||||
}
|
||||
|
||||
fn opfx33(cpu: &mut CPU, register_x: usize) {
|
||||
let vx = cpu.registers.get(register_x);
|
||||
fn op_fx33(cpu: &mut CPU) {
|
||||
let vx = cpu.registers.get(cpu.opcode.x);
|
||||
cpu.ram.write8(cpu.index_register, vx / 100);
|
||||
cpu.ram.write8(cpu.index_register + 1, vx / 10 % 10);
|
||||
cpu.ram.write8(cpu.index_register + 2, vx % 10);
|
||||
}
|
||||
|
||||
fn opfx55(cpu: &mut CPU, register_x: usize) {
|
||||
fn op_fx55(cpu: &mut CPU) {
|
||||
let i = cpu.index_register;
|
||||
for regs in 0x0..(register_x + 1) {
|
||||
for regs in 0x0..(cpu.opcode.x + 1) {
|
||||
cpu.ram.write8(i + regs, cpu.registers.get(regs));
|
||||
}
|
||||
// cpu.index_register += register_x + 1;
|
||||
}
|
||||
|
||||
fn opfx65(cpu: &mut CPU, register_x: usize) {
|
||||
fn op_fx65(cpu: &mut CPU) {
|
||||
let i = cpu.index_register;
|
||||
for regs in 0x0..(register_x + 1) {
|
||||
for regs in 0x0..(cpu.opcode.x + 1) {
|
||||
cpu.registers.set(regs, cpu.ram.read8(i + regs));
|
||||
}
|
||||
// cpu.index_register += register_x + 1;
|
||||
}
|
||||
Loading…
Reference in New Issue