main.rs

#![no_std]
#![no_main]
#![feature(never_type)]
#![feature(unwrap_infallible)]

mod framebuffer;

#[panic_handler]
fn panic(_info: &core::panic::PanicInfo) -> ! {
    loop {}
}

fn draw_demo<T>(fb: &mut T) -> Result<(), T::Error>
where
    T: embedded_graphics::DrawTarget<embedded_graphics::pixelcolor::Rgb888>,
{
    use embedded_graphics::prelude::*;
    use embedded_graphics::pixelcolor::Rgb888;
    use embedded_graphics::primitives::Circle;
    use embedded_graphics::fonts::{Font24x32, Text};
    use embedded_graphics::style::{PrimitiveStyle, TextStyle};

    fb.clear(Rgb888::BLACK)?;

    Circle::new(Point::new(20, 20), 8)
        .into_styled(PrimitiveStyle::with_fill(Rgb888::RED))
        .draw(fb)?;

    Text::new("Hello framebuffer!", Point::new(20, 16))
        .into_styled(TextStyle::new(Font24x32, Rgb888::BLUE))
        .draw(fb)?;

    Ok(())
}

blueloader_info::entry_point!(kmain);
fn kmain(info: blueloader_info::BootInfo) -> ! {
    let mut fb = framebuffer::Framebuffer::new(&info.framebuffer);
    draw_demo(&mut fb).into_ok();

    loop {
        x86_64::instructions::hlt();
    }
}