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use std::fmt::Write;
pub struct ErrorReport {
pub y_offset: i32,
// One extra leading byte for a null terminator when word-breaking.
buf: [u8; Self::LINE_MAX_WIDTH + 1],
pos: usize,
}
impl ErrorReport {
pub const DISPLAY_WIDTH: i32 = 480;
pub const DISPLAY_HEIGHT: i32 = 240;
pub const BOX_MARGIN: i32 = 16;
pub const BOX_PADDING: i32 = 16;
pub const LINE_HEIGHT: i32 = 20;
pub const LINE_MAX_WIDTH: usize = 52;
pub const COLOR_RED: u32 = 0x8b0_000;
pub const COLOR_WHITE: u32 = 0xFFF_FFF;
pub fn begin() -> Self {
unsafe {
vex_sdk::vexDisplayDoubleBufferDisable();
vex_sdk::vexDisplayForegroundColor(Self::COLOR_RED);
vex_sdk::vexDisplayRectFill(
Self::BOX_MARGIN,
Self::BOX_MARGIN,
Self::DISPLAY_WIDTH - Self::BOX_MARGIN,
Self::DISPLAY_HEIGHT - Self::BOX_MARGIN,
);
vex_sdk::vexDisplayForegroundColor(Self::COLOR_WHITE);
vex_sdk::vexDisplayRectDraw(
Self::BOX_MARGIN,
Self::BOX_MARGIN,
Self::DISPLAY_WIDTH - Self::BOX_MARGIN,
Self::DISPLAY_HEIGHT - Self::BOX_MARGIN,
);
vex_sdk::vexDisplayFontNamedSet(c"monospace".as_ptr());
}
Self {
buf: [0; 53],
pos: 0,
y_offset: Self::BOX_MARGIN + Self::BOX_PADDING,
}
}
#[allow(unused)]
pub fn write_registers(&mut self, regs: [u32; 16]) {
unsafe {
vex_sdk::vexDisplayTextSize(1, 5);
}
for (i, reg) in regs.iter().enumerate() {
let x = 50 + (i as i32 % 4) * 95;
match i {
0..=12 => unsafe {
let format = c" r%d: 0x%08x";
vex_sdk::vexDisplayPrintf(
x,
self.y_offset,
0,
if i < 10 {
format.as_ptr()
} else {
format[1..].as_ptr()
},
i,
*reg,
);
},
13..16 => unsafe {
vex_sdk::vexDisplayPrintf(
x,
self.y_offset,
0,
match i {
13 => c" sp: 0x%08x".as_ptr(),
14 => c" lr: 0x%08x".as_ptr(),
15 => c" pc: 0x%08x".as_ptr(),
_ => core::hint::unreachable_unchecked(),
},
*reg,
i,
);
},
_ => {}
}
if i % 4 == 3 {
self.y_offset += 10;
}
}
self.y_offset += 10;
}
pub fn write_backtrace(&mut self, i: i32, frame: u32) {
unsafe {
vex_sdk::vexDisplayTextSize(1, 5);
}
let format = c" %d: 0x%08x";
unsafe {
vex_sdk::vexDisplayPrintf(
50 + (i % 4) * 95,
self.y_offset,
0,
if i < 10 {
format.as_ptr()
} else {
format[1..].as_ptr()
},
i,
frame,
);
}
if i % 4 == 3 {
self.y_offset += 10;
}
}
pub const fn finish_backtrace(&mut self, i: i32) {
if i % 4 != 0 {
self.y_offset += 20;
} else {
self.y_offset += 10;
}
}
}
impl Write for ErrorReport {
fn write_str(&mut self, s: &str) -> std::fmt::Result {
unsafe {
vex_sdk::vexDisplayTextSize(1, 4);
}
for mut character in s.chars() {
// Brain's default font handling only supports ASCII (though there are CJK fonts).
if !character.is_ascii() {
character = '?';
}
self.buf[self.pos] = character as u8;
if character == '\n' || self.pos == Self::LINE_MAX_WIDTH - 1 {
let wrap_point = if character == '\n' {
// Wrap due to early LF.
self.buf[self.pos] = 0; // insert null terminator at newline
self.pos
} else if let Some(space_position) = self.buf.iter().rposition(|x| *x == b' ') {
// Word wrap if there's a space on the current line.
self.buf[space_position] = 0; // insert null terminator at space
space_position
} else {
// Fallback to letter wrapping if there's no space on the line.
Self::LINE_MAX_WIDTH - 1
};
// Put the thing on the screen!
unsafe {
vex_sdk::vexDisplayPrintf(
Self::BOX_MARGIN + Self::BOX_PADDING,
self.y_offset,
0,
self.buf.as_ptr().cast(),
);
}
self.y_offset += Self::LINE_HEIGHT;
// Since we just wrapped, we need to move the remaining characters in the string (if
// there are any) to the front of the next line.
if self.pos == Self::LINE_MAX_WIDTH - 1 {
self.buf.copy_within(wrap_point + 1.., 0);
self.pos -= wrap_point;
} else {
self.pos = 0;
}
continue;
}
self.pos += 1;
}
Ok(())
}
}