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Move where CHIP-8 Program Counter is updated

This commit is contained in:
Rekai Musuka 2020-07-13 22:16:42 -05:00
parent f4a8840b91
commit acf1b10e66
2 changed files with 14 additions and 16 deletions
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12
src/emu.rs
View File

@ -59,7 +59,8 @@ impl Chip8 {
pub fn execute_cycle(&mut self) {
let opcode = self.get_opcode();
// println!("{:#x}", self.opcode);
self.pc += 2; // Immediately increment the Program Counter
self.execute_opcode(opcode);
self.delay.tick();
@ -82,7 +83,6 @@ impl Chip8 {
fn get_opcode(&self) -> u16 {
let pc = self.pc as usize;
((self.memory[pc] as u16) << 8) | self.memory[pc + 1] as u16
}
@ -105,8 +105,6 @@ impl Chip8 {
let y = nib_3;
let n = nib_4;
self.pc += 2;
match (nib_1, nib_2, nib_3, nib_4) {
// CLS
(0x0, 0x0, 0xE, 0x0) => self.cls(),
@ -197,7 +195,7 @@ impl Chip8 {
fn jmp_addr(&mut self, nnn: u16) {
// sets the program counter to addr (nnn)
self.pc = nnn - 2; // We want to execute nnn so decrement pc by 2;
self.pc = nnn; // We want to execute nnn so decrement pc by 2;
}
fn call_addr(&mut self, nnn: u16) {
@ -205,7 +203,7 @@ impl Chip8 {
// pc is then set to addr
self.sp += 1;
self.stack[self.sp as usize] = self.pc;
self.pc = nnn - 2; // see Chip8#jmp_addr()
self.pc = nnn; // see Chip8#jmp_addr()
}
fn se_vx_byte(&mut self, x: u8, kk: u8) {
@ -323,7 +321,7 @@ impl Chip8 {
fn jmp_addr_with_offset(&mut self, nnn: u16) {
// set program counter to addr + V0
self.pc = nnn + self.v[0] as u16 - 2; // see Chip8#jmp_addr
self.pc = nnn + self.v[0] as u16; // see Chip8#jmp_addr
}
fn rand(&mut self, x: u8, kk: u8) {

18
src/main.rs
View File

@ -15,17 +15,15 @@ static WIDTH: u32 = 64;
static HEIGHT: u32 = 32;
fn main() {
let mut chip8: Chip8 = Default::default();
let mut input = WinitInputHelper::new();
let event_loop = EventLoop::new();
let window = init_window(&event_loop);
let mut hidpi_factor = window.scale_factor();
let mut pixels = init_pixels(&window);
let mut hidpi_factor = window.scale_factor();
let mut input = WinitInputHelper::new();
let mut chip8: Chip8 = Default::default();
chip8
.load_rom(Path::new("./games/ibm_logo.ch8"))
.expect("Unable to load ROM");
let rom_path = Path::new("./games/ibm_logo.ch8");
chip8.load_rom(rom_path).expect("Unable to load ROM");
event_loop.run(move |event, _, control_flow| {
if let Event::RedrawRequested(_) = event {
@ -67,11 +65,13 @@ fn init_pixels(window: &Window) -> Pixels {
}
fn init_window(event_loop: &EventLoop<()>) -> Window {
let size = LogicalSize::new(WIDTH as f64, HEIGHT as f64);
const SCALE: u32 = 10;
let min_size = LogicalSize::new(WIDTH as f64, HEIGHT as f64);
let size = LogicalSize::new((WIDTH * SCALE) as f64, (HEIGHT * SCALE) as f64);
WindowBuilder::new()
.with_title("Chip8 Emulator")
.with_inner_size(size)
.with_min_inner_size(size)
.with_min_inner_size(min_size)
.build(event_loop)
.unwrap()
}