gb-emu/lib/src/connect/mod.rs

use crate::processor::memory::mmio::gpu::Colour;
pub use crate::processor::memory::mmio::joypad::{JoypadButtons, JoypadState};
pub use crate::{HEIGHT, WIDTH};
use async_ringbuf::{AsyncHeapConsumer, AsyncHeapProducer, AsyncHeapRb};
use futures::executor;

pub enum EmulatorMessage {
    Stop,
}

pub enum RomFile {
    Path(String),
    Raw(Vec<u8>),
}

#[cfg(feature = "async")]
pub trait Renderer<Format: From<Colour>>: Send {
    fn prepare(&mut self, width: usize, height: usize);

    fn display(&mut self, buffer: &[Format]);

    fn set_title(&mut self, _title: String) {}

    fn latest_joypad_state(&mut self) -> JoypadState;

    fn set_rumble(&mut self, _rumbling: bool) {}
}

#[cfg(not(feature = "async"))]
pub trait Renderer<Format: From<Colour>> {
    fn prepare(&mut self, width: usize, height: usize);

    fn display(&mut self, buffer: &[Format]);

    fn set_title(&mut self, _title: String) {}

    fn latest_joypad_state(&mut self) -> JoypadState;

    fn set_rumble(&mut self, _rumbling: bool) {}
}

pub struct AudioOutput {
    pub sample_rate: f32,
    pub send_rb: AsyncHeapProducer<[f32; 2]>,
    pub wait_for_output: bool,
}

impl AudioOutput {
    pub fn new(sample_rate: f32, wait_for_output: bool) -> (Self, AsyncHeapConsumer<[f32; 2]>) {
        let (mut output, rx) = Self::new_unfilled(sample_rate, wait_for_output);

        executor::block_on(
            output
                .send_rb
                .push_iter(vec![[0.; 2]; output.send_rb.free_len() - 1].into_iter()),
        )
        .unwrap();

        (output, rx)
    }

    pub fn new_unfilled(
        sample_rate: f32,
        wait_for_output: bool,
    ) -> (Self, AsyncHeapConsumer<[f32; 2]>) {
        let rb_len = sample_rate as usize / (60 * 2);

        let rb = AsyncHeapRb::<[f32; 2]>::new(rb_len);
        let (send_rb, rx) = rb.split();

        (
            Self {
                sample_rate,
                send_rb,
                wait_for_output,
            },
            rx,
        )
    }
}