lifeblood_os/src/dev/framebuffer/mod.rs

use crate::dev::{linebuffer_push, FRAMEBUFFER_HEIGHT, FRAMEBUFFER_WIDTH, LINEBUFFER_ADDR, LINEBUFFER_BPP};
use crate::trafficcontrol::TrafficControl;
use core::sync::atomic::Ordering;

pub mod console;

pub const VAPFONT: &[u8] = include_bytes!("./vapfont.data");
pub const VAPFONT_W: usize = 256;
pub const VAPFONT_H: usize = 112;

pub struct FBColor {
    pub red: u8,
    pub green: u8,
    pub blue: u8,
}

pub const FB_BG_COLOR: FBColor = FBColor {
    red: 216,
    green: 216,
    blue: 216,
};

pub const FB_FG_COLOR: FBColor = FBColor {
    red: 0,
    green: 0,
    blue: 0,
};

impl FBColor {
    #[inline]
    pub const fn to_bytes(&self) -> [u8; 3] {
        [self.red, self.green, self.blue]
    }
}

pub fn fb_write_char_array(tc: &mut TrafficControl, mut x: usize, mut y: usize, chars: &[char]) {
    const BYTES: [u8; 3] = FB_FG_COLOR.to_bytes();
    let fbaddr = LINEBUFFER_ADDR.load(Ordering::Relaxed);
    if fbaddr == 0 {
        return;
    }
    const CHAR_SIZE: usize = 16;
    let mut drew_anything = false;
    for line in 0..FRAMEBUFFER_HEIGHT {
        for c in chars {
            let c = *c;
            if c == ' ' {
                x += CHAR_SIZE;
            } else if c as u8 > 32 {
                let c = c as u8 - 32;
                let cx = (c % 16) as usize * CHAR_SIZE;
                let cy = (c / 16) as usize * CHAR_SIZE;
                for row in 0..CHAR_SIZE {
                    if (y+row) != line {
                        continue;
                    }
                    for col in 0..CHAR_SIZE {
                        let coff = (VAPFONT_W * (cy + row)) + (cx + col);
                        let draw = VAPFONT[coff / 8] & (0x80 >> (coff % 8));
                        if draw != 0 {
                            unsafe {
                                //let fb = (fbaddr as *mut u8).add(((y + row) * fbstride) + ((x + col) * 4)) as *mut u32;
                                let fb = (fbaddr as *mut u8).add((x + col) * 4) as *mut u32;
                                fb.write_volatile(u32::from_ne_bytes([0, BYTES[0], BYTES[1], BYTES[2]]));
                                drew_anything = true;
                            }
                        }
                    }
                }
                x += CHAR_SIZE;
            }
        }
        if drew_anything {
            linebuffer_push(tc, line as u32);
        }
    }
}

pub fn fb_clearscreen(tc: &mut TrafficControl) {
    const BYTES: [u8; 3] = FB_BG_COLOR.to_bytes();
    let fbaddr = LINEBUFFER_ADDR.load(Ordering::Relaxed);
    if fbaddr == 0 {
        return;
    }
    for y in 0..FRAMEBUFFER_HEIGHT {
        for x in 0..FRAMEBUFFER_WIDTH {
            unsafe {
                //let fb = (fbaddr as *mut u8).add(((y)*fbstride) + ((x)*4)) as *mut u32;
                let fb = (fbaddr as *mut u8).add(x*4) as *mut u32;
                fb.write_volatile(u32::from_ne_bytes([0, BYTES[0], BYTES[1], BYTES[2]]));
            }
        }
        linebuffer_push(tc, y as u32);
    }
}