2021-09-10 16:32:09 +02:00
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#![no_std]
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2021-12-09 12:32:45 +01:00
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mod nanolibc;
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2021-12-09 00:18:30 +01:00
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mod sys;
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pub use sys::*;
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2021-09-10 16:32:09 +02:00
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#[derive(Clone, Copy)]
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pub struct Color(u8, u8, u8);
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impl Color {
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pub fn rgb(r: u8, g: u8, b: u8) -> Self {
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Self(r, g, b)
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}
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pub fn r(&self) -> u8 {
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self.0
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}
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2021-09-10 16:32:09 +02:00
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pub fn g(&self) -> u8 {
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self.1
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}
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2021-09-10 16:32:09 +02:00
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pub fn b(&self) -> u8 {
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self.2
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}
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pub fn as_rgb_val(self) -> u32 {
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(self.0 as u32) << 16 | (self.1 as u32) << 8 | (self.0 as u32)
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}
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}
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pub struct Dot {
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pub x: u32,
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pub y: u32,
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}
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#[repr(u32)]
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pub enum WindowKind {
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Fixed = 0,
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NoDraw = 1,
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Resizable = 2,
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Themed = 3,
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FixedThemed = 4,
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}
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pub struct WindowParams<'a> {
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pub color: Color,
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pub kind: WindowKind,
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pub title: Option<&'a cstr_core::CStr>,
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}
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pub fn define_window(start: Dot, width: u32, height: u32, params: WindowParams<'_>) {
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const RELATIVE_FLAG: u32 = 0x20;
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unsafe {
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sys::define_window(
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start.x * 65536 + width,
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start.y * 65536 + height,
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params.color.as_rgb_val()
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| (RELATIVE_FLAG | (params.title.is_some() as u32) << 4 | params.kind as u32) << 24,
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0,
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params
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.title
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.map(|s| s.as_ptr())
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.unwrap_or_else(core::ptr::null) as u32,
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);
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}
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}
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pub struct WindowTextParams<'a> {
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pub color: Color,
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pub text: &'a str,
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pub bg_color: Option<Color>,
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}
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pub fn display_message(start: Dot, params: WindowTextParams<'_>) {
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const UTF8_FLAG: u32 = 0b0011_0000 << 24;
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const BG_FLAG: u32 = 0b0100_0000 << 24;
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2021-12-09 00:18:30 +01:00
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unsafe {
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sys::display_message(
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start.x * 65536 + start.y,
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params.color.as_rgb_val() | BG_FLAG * params.bg_color.is_some() as u32 | UTF8_FLAG,
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params.text.as_ptr() as u32,
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params.text.len() as u32,
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0,
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);
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}
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}
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pub fn exit() -> ! {
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unsafe { sys::exit() }
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}
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#[panic_handler]
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fn panic(_info: &core::panic::PanicInfo) -> ! {
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exit();
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}
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#[non_exhaustive]
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pub enum Event {
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Redraw,
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KeyPress,
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}
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pub fn fetch_event() -> Option<Event> {
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match unsafe { sys::wait_event() } {
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1 => Some(Event::Redraw),
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2 => Some(Event::KeyPress),
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_ => None,
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}
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}
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pub fn fetch_key() -> Option<u8> {
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let res = unsafe { sys::pressed_key() };
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if res == 1 {
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None
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} else {
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Some(((res >> 8) & 0xff) as u8)
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}
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}
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