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|
use std::{
io::{stdout, Write},
usize,
};
use bevy::{
prelude::*,
render::render_resource::{Extent3d, TextureFormat},
};
use crossterm::{
cursor::{self, MoveTo},
event::{read, Event, KeyEventKind, KeyboardEnhancementFlags, PushKeyboardEnhancementFlags},
terminal::enable_raw_mode,
ExecutableCommand, QueueableCommand,
};
use grex_framebuffer_extract::{
components::FramebufferExtractDestination, render_assets::FramebufferExtractSource,
};
use crate::{
events::TerminalInputEvent,
resources::{EventQueue, TerminalInput},
};
const BRAILLE_CODE_MIN: u16 = 0x2800;
const BRAILLE_CODE_MAX: u16 = 0x28FF;
const BRAILLE_DOT_BIT_POSITIONS: [u8; 8] = [0, 1, 2, 6, 3, 4, 5, 7];
pub fn setup(event_queue: Res<EventQueue>) {
let event_queue = event_queue.0.clone();
std::thread::spawn(move || {
loop {
// `read()` blocks until an `Event` is available
match read() {
Ok(event) => {
event_queue.lock().unwrap().push(event);
}
Err(err) => {
panic!("Error reading input events: {:?}", err);
}
}
}
});
let mut stdout = stdout();
enable_raw_mode().expect("Failed to put terminal into raw mode");
let _ = stdout.execute(PushKeyboardEnhancementFlags(
KeyboardEnhancementFlags::REPORT_EVENT_TYPES,
));
let _ = stdout.execute(cursor::Hide);
}
pub fn print_to_terminal(image_exports: Query<&FramebufferExtractDestination>) {
for image_export in image_exports.iter() {
let mut image = image_export
.0
.lock()
.expect("Failed to get lock on output texture");
//TODO: Find a better way of preventing first frame
if image.size() == UVec2::ONE {
continue;
}
if image.texture_descriptor.format != TextureFormat::R8Unorm {
warn_once!("Extracted framebuffer texture is not R8Unorm format. Will attempt conversion, but consider changing your render texture's format.");
info_once!("{:?}", image);
match image.convert(TextureFormat::R8Unorm) {
Some(img) => *image = img,
None => error_once!(
"Could not convert to R8Unorm texture format. Unexpected output may occur."
),
};
}
let mut output_buffer = Vec::<char>::new();
let width = image.width();
let height = image.height();
let data = &image.data;
for character_y in (0..height).step_by(4) {
for character_x in (0..width).step_by(2) {
let mut mask: u8 = 0;
for offset_x in 0..2 {
for offset_y in 0..4 {
let x = character_x + offset_x;
let y = character_y + offset_y;
if x < width && y < height && data[(y * width + x) as usize] == 0xFF {
mask |= 1
<< (BRAILLE_DOT_BIT_POSITIONS[(offset_x * 4 + offset_y) as usize]);
}
}
}
output_buffer.push(braille_char(mask));
}
}
let string = output_buffer.into_iter().collect::<String>();
let mut stdout = stdout();
stdout.queue(MoveTo(0, 0)).unwrap();
stdout.write_all(string.as_bytes()).unwrap();
stdout.flush().unwrap();
}
}
fn braille_char(mask: u8) -> char {
match char::from_u32((BRAILLE_CODE_MIN + mask as u16) as u32) {
Some(character) => {
if character as u16 > BRAILLE_CODE_MAX {
panic!("Number too big!")
}
character
}
None => panic!("Error converting character!"),
}
}
pub fn input_handling(
event_queue: Res<EventQueue>,
mut input: ResMut<TerminalInput>,
mut event_writer: EventWriter<TerminalInputEvent>,
) {
let mut event_queue = event_queue.0.lock().unwrap();
while let Some(event) = event_queue.pop() {
if let Event::Key(event) = event {
match event.kind {
KeyEventKind::Press => {
input.press(event.code);
}
KeyEventKind::Release => {
input.release(event.code);
}
_ => (),
}
}
event_writer.send(TerminalInputEvent(event));
}
}
pub fn resize_handling(
mut images: ResMut<Assets<Image>>,
mut sources: ResMut<Assets<FramebufferExtractSource>>,
mut event_reader: EventReader<TerminalInputEvent>,
) {
for event in event_reader.read() {
if let Event::Resize(w, h) = event.0 {
for source in sources.iter_mut() {
let image = images.get_mut(&source.1 .0).unwrap();
image.resize(Extent3d {
width: w as u32 * 2,
height: h as u32 * 4,
depth_or_array_layers: 1,
});
}
}
}
}
|
