61 lines
1.6 KiB
Rust
61 lines
1.6 KiB
Rust
use crate::cpu::Cpu as SM83;
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use crate::instruction::Cycle;
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use crate::joypad;
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use crate::ppu::Ppu;
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use anyhow::Result;
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use gilrs::Gilrs;
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use std::time::Duration;
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use winit_input_helper::WinitInputHelper;
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pub const SM83_CYCLE_TIME: Duration = Duration::from_nanos(1_000_000_000 / SM83_CLOCK_SPEED);
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pub const CYCLES_IN_FRAME: Cycle = Cycle::new(456 * 154); // 456 Cycles times 154 scanlines
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pub(crate) const SM83_CLOCK_SPEED: u64 = 0x40_0000; // Hz which is 4.194304Mhz
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const DEFAULT_TITLE: &str = "DMG-01 Emulator";
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const GAMEPAD_ENABLED: bool = false;
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pub fn init(boot_path: Option<&str>, rom_path: &str) -> Result<SM83> {
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let mut cpu = match boot_path {
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Some(path) => SM83::boot_new(path)?,
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None => SM83::new(),
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};
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eprintln!("Initialized GB Emulator");
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cpu.load_cartridge(rom_path)?;
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Ok(cpu)
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}
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pub fn rom_title(game_boy: &SM83) -> &str {
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game_boy.rom_title().unwrap_or(DEFAULT_TITLE)
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}
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pub fn run(
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game_boy: &mut SM83,
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gamepad: &mut Gilrs,
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input: &WinitInputHelper,
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pending: Cycle,
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) -> Cycle {
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let mut elapsed = Cycle::new(0);
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while elapsed < pending {
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elapsed += run_unsynced(game_boy, gamepad, input);
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}
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elapsed
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}
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pub fn run_unsynced(game_boy: &mut SM83, gamepad: &mut Gilrs, input: &WinitInputHelper) -> Cycle {
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if GAMEPAD_ENABLED {
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if let Some(event) = gamepad.next_event() {
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joypad::handle_gamepad_input(game_boy.joypad_mut(), event);
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}
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}
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joypad::handle_keyboard_input(game_boy.joypad_mut(), input);
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game_boy.step()
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}
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pub fn draw(ppu: &Ppu, frame: &mut [u8]) {
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ppu.copy_to_gui(frame);
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}
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