82 lines
1.9 KiB
Rust
82 lines
1.9 KiB
Rust
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use femtos::Duration;
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use moa_core::{System, Error, Address, Addressable, Steppable, Transmutable};
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use moa_core::host::{self, Host, Frame, FrameSender, Pixel};
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const SCRN_BASE: u32 = 0x07A700;
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const SCRN_SIZE: (u32, u32) = (512, 342);
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pub struct MacVideo {
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frame_sender: FrameSender,
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}
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impl MacVideo {
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pub fn new<H: Host>(host: &mut H) -> Result<Self, Error> {
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let (frame_sender, frame_receiver) = host::frame_queue(SCRN_SIZE.0, SCRN_SIZE.1);
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host.add_video_source(frame_receiver)?;
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Ok(Self {
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frame_sender,
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})
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}
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}
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pub struct BitIter {
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bit: i8,
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data: u16,
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}
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impl BitIter {
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pub fn new(data: u16) -> Self {
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Self {
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bit: 15,
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data,
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}
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}
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}
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impl Iterator for BitIter {
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type Item = Pixel;
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fn next(&mut self) -> Option<Self::Item> {
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if self.bit < 0 {
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None
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} else {
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let bit = (self.data & (1 << self.bit)) != 0;
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self.bit -= 1;
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if bit {
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Some(Pixel::Rgb(0xC0, 0xC0, 0xC0))
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} else {
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Some(Pixel::Rgb(0, 0, 0))
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}
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}
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}
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}
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impl Steppable for MacVideo {
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fn step(&mut self, system: &System) -> Result<Duration, Error> {
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let mut memory = system.get_bus();
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let mut frame = Frame::new(SCRN_SIZE.0, SCRN_SIZE.1, self.frame_sender.encoding());
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for y in 0..SCRN_SIZE.1 {
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for x in 0..(SCRN_SIZE.0 / 16) {
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let word = memory.read_beu16(system.clock, (SCRN_BASE + (x * 2) + (y * (SCRN_SIZE.0 / 8))) as Address)?;
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frame.blit(x * 16, y, BitIter::new(word), 16, 1);
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}
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}
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self.frame_sender.add(system.clock, frame);
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Ok(Duration::from_micros(16_600))
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}
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}
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impl Transmutable for MacVideo {
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fn as_steppable(&mut self) -> Option<&mut dyn Steppable> {
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Some(self)
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}
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}
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