Trevor Merritt
b4383436aa
backend isnt writing a sprite correctly and attempting to poke outside memory
109 lines
3.3 KiB
Rust
109 lines
3.3 KiB
Rust
use log::{debug, error};
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use crate::chip8::delay_timer::DelayTimer;
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use crate::chip8::instructions::Chip8CpuInstructions::XXXXERRORINSTRUCTION;
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use crate::chip8::keypad::Keypad;
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use crate::chip8::registers::Chip8Registers;
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use crate::chip8::sound_timer::SoundTimer;
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use crate::chip8::stack::Chip8Stack;
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use crate::chip8::util::InstructionUtil;
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use crate::constants::{CHIP8_MEMORY_SIZE, CHIP8_REGISTER_COUNT};
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use super::{
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cpu_states::Chip8CpuStates, instructions::Chip8CpuInstructions, system_memory::Chip8SystemMemory, video::Chip8Video,
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};
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const STACK_POINTER_DEFAULT: i16 = 0x100;
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#[derive(Clone)]
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pub struct Chip8Computer {
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pub memory: Chip8SystemMemory,
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pub registers: Chip8Registers,
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pub sound_timer: SoundTimer,
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pub delay_timer: DelayTimer,
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pub video_memory: Chip8Video,
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pub state: Chip8CpuStates,
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pub keypad: Keypad,
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pub stack: Chip8Stack
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}
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impl Default for Chip8Computer {
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fn default() -> Self {
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Self {
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memory: Chip8SystemMemory::default(),
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video_memory: Chip8Video::default(),
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registers: Chip8Registers::default(),
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sound_timer: SoundTimer::new(),
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delay_timer: DelayTimer::new(),
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state: Chip8CpuStates::default(),
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keypad: Keypad::default(),
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stack: Chip8Stack::default()
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}
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}
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}
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impl Chip8Computer {
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pub fn new_with_program(new_program: Box<Vec<u16>>) -> Self {
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let mut working = Chip8Computer::new();
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for i in 0..new_program.len() {
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let high_byte = (new_program[i as usize] >> 8) as u8;
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let low_byte = (new_program[i] & 0xff) as u8;
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let base_offset = i * 2;
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working.memory.poke(base_offset as u16, high_byte);
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working.memory.poke((base_offset + 1) as u16, low_byte);
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}
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working
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}
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pub fn new() -> Self {
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Chip8Computer::default()
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}
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pub fn load_bytes_to_memory(&mut self, offset: u16, to_load: Box<Vec<u8>>) {
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let total_len = to_load.len() as u16;
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for current_index in 0..total_len {
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let new_value = to_load[current_index as usize];
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let new_location = current_index + offset;
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self.memory.poke(new_location, new_value);
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}
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}
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pub fn step_system(&mut self) -> &mut Chip8Computer {
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debug!("Stepping System 1 Step");
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// read the next instruction
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let mut working_instruction: u16 = 0b0000000000000000;
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let start_pc = self.registers.peek_pc();
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let high_byte = (self.memory.clone().peek(start_pc) as u16).rotate_left(8);
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let low_byte = self.memory.clone().peek(start_pc + 1) as u16;
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let result = high_byte | low_byte;
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let decoded_instruction =
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Chip8CpuInstructions::decode(result);
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// todo: THIS IS BAD AND IS A SIDE EFFECT
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decoded_instruction.execute(self);
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match self.state {
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Chip8CpuStates::WaitingForInstruction => {
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self.sound_timer.tick();
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self.delay_timer.tick();
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}
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Chip8CpuStates::WaitingForKey => {
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println!("waiting for a key press...");
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}
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_ => {}
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}
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self
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}
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}
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#[cfg(test)]
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mod test {
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use rand::random;
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use crate::constants::CHIP8_VIDEO_MEMORY;
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use super::*;
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#[test]
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fn smoke() {
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assert!(true)
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}
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}
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