In Rust, I'm working on an on_update() function for a renderer. There are certain variables I would like to store outside the loop, then access and change within the function.
Example in pseudocode:
global mut lastMousePos: Vec2 = Vec2::new(0.0, 0.0); // lastMousePos can be written to and read from
pub struct Camera {
/* ... */
}
impl Camera {
/* ... */
pub fn on_update(self, timestep: f32, input: &WinitInputHelper) {
let Some((x, y)) = input.mouse();
let mousePos = Vec2::new(x, y);
let delta = (mousePos - lastMousePos) * 0.002;
lastMousePos = mousePos;
/* ... */
}
/* ... */
}
(/* ... */ = code hidden for brevity)
In this example, I'd like to be able to read lastMousePos, then write a new value to it. I need this functionality in other contexts as well.
I tried reading the Rust docs for solutions, but, as always, I just got more confused.
