movement

1 files changed, 6 insertions, 0 deletions

diff --git a/public/gl/gl.js b/public/gl/gl.js
index 20b6225..ca0dbe6 100644
--- a/public/gl/gl.js
+++ b/public/gl/gl.js
@@ -10,9 +10,15 @@ export { Mat4 } from './math/Mat4.js'
 export { Vec2 } from './math/Vec2.js'
 export { Vec3 } from './math/Vec3.js'
 export { Loop }
+export { DT }
 
+var DT = 0;
+var last = Date.now()
 const Loop = (fn) => {
     const callback = () => {
+        var now = Date.now()
+        DT = ( now - last) / 1000
+        last = now
         fn()
         window.requestAnimationFrame(callback)
     }