Fixed update for physics

[Cyrodwd]

Similar to _physics_process in Godot 3.x/4.x.
To perform physics updates at a fixed timestep, to maintain consistent physics (so to speak).
Godot Documentation Here

[Kapendev]

So maybe in ready you call:

every(1.0 / 60.0, &updatePhysics);

[Kapendev]

I think these 3 functions will do what you want:

TaskId schedule(float interval, EngineUpdateFunc func, ubyte count = 0, bool canCallNow = false);
TaskId every(int fps, EngineUpdateFunc func);
void cancel(TaskId id);

You can use them for both physics and as a timer.

schedule(0.5, &countDown, 3); // Run `countDown` every 0.5 seconds and do it 3 times.
every(60, &updatePhysics); // Run `updatePhysics` at 60 FPS (1/60 seconds) and do it forever.

[Kapendev]

Or every could be removed and just write schedule(1.0 / 60.0, &updatePhysics).

[Kapendev]

I kinda like it. Btw, every is now schedule, so it's using seconds instead of FPS.

import parin;

auto str = "Hello world!";

bool updateStr(float dt) {
    str ~= '!';
    return false;
}

void ready() {
    every(1, &updateStr);
}

bool update(float dt) {
    drawDebugText(str, Vec2(8));
    return false;
}

mixin runGame!(ready, update, null);

[Kapendev]

https://github.com/Kapendev/parin/blob/main/TOUR.md#scheduling