Mouse.current.position returns stale value #1073
Description
Mouse.current.position should return the latest mouse position but it returns the previous mouse position instead.
Repro code:
mousetest.zip
using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.UI;
public class Test : MonoBehaviour
{
[SerializeField] Text textOldInputXY;
[SerializeField] Text textInputSystemXY;
[SerializeField] Text textOK;
private void Update()
{
Vector3 oldSystemMousePos = Input.mousePosition;
Vector2 inputSystemMousePos = Mouse.current.position.ReadValue();
if (oldSystemMousePos.x == inputSystemMousePos.x && oldSystemMousePos.y == inputSystemMousePos.y)
{
textOK.color = Color.green;
textOK.text = "ok";
}
else
{
textOK.color = Color.red;
textOK.text = "fail";
}
textOldInputXY.text = $"{oldSystemMousePos.x} {oldSystemMousePos.y}";
textInputSystemXY.text = $"{inputSystemMousePos.x} {inputSystemMousePos.y}";
}
}
Scenario 1: Change mouse DPI to the lowest possible value. Slowly move the mouse (5px/s). Observed result: the text quickly changes: "ok/fail/..." for every pixel, new Input System's position lags behind by 1 px.
Scenario 2: While moving the mouse relatively quickly, lift the mouse up. Keep the mouse in the air. Observed result: Text shows "fail". Old input system mouse position is correct. New Input System's mouse position is different by >10 pixels, showing the previous value.
Unity: 2019.3.2f1
InputSystem: 1.0.0-preview.5
Windows 10
fogbugz Case 1221634.