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[cpu] Implement Conditional execution instructions

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Atreya Bain
2024-03-05 10:12:53 +05:30
parent ce7c224470
commit d1b3cff7eb
1 changed files with 41 additions and 27 deletions
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32
src/device/device.rs
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@@ -15,7 +15,7 @@ pub struct Device {
pub timer: Timer, pub timer: Timer,
pub stack: Vec<u16>, pub stack: Vec<u16>,
pub frame_buffer: Arc<Mutex<Box<[bool; 64 * 32]>>>, pub frame_buffer: Arc<Mutex<Box<[bool; 64 * 32]>>>,
pub super_chip8_mode: bool pub super_chip8_mode: bool,
} }
impl Device { impl Device {
@@ -32,7 +32,7 @@ impl Device {
frame_buffer: fb, frame_buffer: fb,
stack: Vec::with_capacity(16), stack: Vec::with_capacity(16),
timer, timer,
super_chip8_mode: false super_chip8_mode: false,
} }
} }
} }
@@ -66,8 +66,6 @@ impl Device {
let instruction = Instruction::decode_instruction(instr_slice); let instruction = Instruction::decode_instruction(instr_slice);
self.execute_instruction(instruction); self.execute_instruction(instruction);
} }
/// convert the 2 indices into one /// convert the 2 indices into one
fn get_framebuffer_index(x: usize, y: usize) -> usize { fn get_framebuffer_index(x: usize, y: usize) -> usize {
@@ -105,7 +103,7 @@ impl Device {
let y = self.registers.v[regy] as usize; let y = self.registers.v[regy] as usize;
let toggle_state = self.draw_sprite_at_location(x, y, n); let toggle_state = self.draw_sprite_at_location(x, y, n);
self.set_flag_register(toggle_state); self.set_flag_register(toggle_state);
}, }
Instruction::JumpAndLink(jump_location) => { Instruction::JumpAndLink(jump_location) => {
self.stack.push(self.registers.pc); self.stack.push(self.registers.pc);
self.registers.pc = jump_location; self.registers.pc = jump_location;
@@ -115,10 +113,26 @@ impl Device {
self.registers.pc = old_pc; self.registers.pc = old_pc;
} }
Instruction::ConditionalEqSkipNext(_, _) => {} Instruction::ConditionalEqSkipNext(regx, num) => {
Instruction::ConditionalInEqSkipNext(_, _) => {} if self.registers.v[regx] == num {
Instruction::ConditionalEqRegisterSkipNext(_, _) => {} self.registers.pc += 2;
Instruction::ConditionalInEqRegisterSkipNext(_, _) => {} }
}
Instruction::ConditionalInEqSkipNext(regx, num) => {
if self.registers.v[regx] != num {
self.registers.pc += 2;
}
}
Instruction::ConditionalEqRegisterSkipNext(regx, regy) => {
if self.registers.v[regx] == self.registers.v[regy] {
self.registers.pc += 2;
}
}
Instruction::ConditionalInEqRegisterSkipNext(regx, regy) => {
if self.registers.v[regx] != self.registers.v[regy] {
self.registers.pc += 2;
}
}
Instruction::JumpWithOffset(_, _) => {} Instruction::JumpWithOffset(_, _) => {}
Instruction::RandomAnd(dest, n) => { Instruction::RandomAnd(dest, n) => {
self.registers.v[dest] = random::<u8>() & n; self.registers.v[dest] = random::<u8>() & n;