Nohiya Dev

Game Loops

#include <time.h>

double seconds(void) {
    struct timespec t;
    timespec_get(&t, TIME_UTC);
    return (double)t.tv_sec + t.tv_nsec / 1e9;
}

void update(double dt) {
    // Update your game here.
}

void draw(void) {
    // Draw your game here.
}

int main(void) {
    int running = 1;
    double previous = seconds();

    while (running) {
        double now = seconds();
        double dt = now - previous;
        previous = now;

        // Read input; set running = 0 to quit.
        update(dt);
        draw();

        // Add a platform-specific wait to limit CPU use.
    }

    return 0;
}

function update(dt) {
  // Update your game here.
}

function draw() {
  // Draw your game here.
}

let running = true;
let previous = performance.now();

function loop(now) {
  if (!running) return;

  const dt = (now - previous) / 1000;
  previous = now;

  // Read input; set running = false to quit.
  update(dt);
  draw();

  requestAnimationFrame(loop);
}

requestAnimationFrame(loop);

import std/[monotimes, os]

proc update(dt: float) =
  discard # Update your game here.

proc draw() =
  discard # Draw your game here.

var running = true
var previous = getMonoTime()

while running:
  let now = getMonoTime()
  let dt = float(now.ticks - previous.ticks) / 1_000_000_000.0
  previous = now

  # Read input; set running = false to quit.
  update(dt)
  draw()
  sleep(1) # Briefly yield the CPU.

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