starting with jme3-lwjgl3-3.10.0-beta1, InputManager.setCursorVisible() re-centers the cursor

[stephengold]

In 3.9.0-alpha4 and earlier builds of JME, invoking inputManager.setCursorVisible() has no effect on the position of the mouse cursor.

In 3.9.0-beta1 and 3.9.0-beta2, inputManager.setCursorVisible() causes the cursor to jump to the center of the window.

Here is a test app:

package mygame;

import com.jme3.app.SimpleApplication;
import com.jme3.input.KeyInput;
import com.jme3.input.controls.ActionListener;
import com.jme3.input.controls.KeyTrigger;
import com.jme3.input.controls.Trigger;

public class Main extends SimpleApplication implements ActionListener {

    public static void main(String[] args) {
        new Main().start();
    }

    @Override
    public void simpleInitApp() {
        // Configure the input mapping:
        Trigger tabTrigger = new KeyTrigger(KeyInput.KEY_TAB);
        String toggleAction = "toggle cursor";
        inputManager.addMapping(toggleAction, tabTrigger);
        inputManager.addListener(this, toggleAction);

        // Pressing the TAB key invokes this.onAction() below.
    }

    @Override
    public void onAction(String string, boolean isPressed, float tpf) {
        if (isPressed) { // toggle cursor visibility:
            boolean isVisible = inputManager.isCursorVisible();
            boolean makeVisible = !isVisible;
            inputManager.setCursorVisible(makeVisible);
        }
    }
}

[JNightRider]

If this happens with lwjgl3, it seems that when the cursor is hidden (invisible), the coordinates are constrained to the window boundaries; that is, the minimum X-coordinate is 0 and the maximum corresponds to the window size. This does not occur in version 3.9 (although I am not sure if this affects other users).

I modified the test that @stephengold provided.

    public void simpleInitApp() {
        // Configure the input mapping:
        Trigger tabTrigger = new KeyTrigger(KeyInput.KEY_TAB);
        MouseButtonTrigger button = new MouseButtonTrigger(MouseInput.BUTTON_LEFT);

        String toggleAction = "toggle cursor";
        String analogAction = "analog action";
        inputManager.addMapping(toggleAction, tabTrigger);
        inputManager.addMapping(analogAction, button);
        inputManager.addListener(this, toggleAction);
        inputManager.addListener(new AnalogListener() {
            @Override
            public void onAnalog(String name, float value, float tpf) {
                System.out.println("position: " + inputManager.getCursorPosition());
            }
        }, analogAction);

        // Pressing the TAB key invokes this.onAction() below.
    }

output

position: (1436.0, 10.0)
position: (1436.0, 10.0)
position: (1436.0, 11.0)
...
position: (180.0, 138.0)
position: (180.0, 138.0)
position: (180.0, 138.0)
position: (180.0, 138.0)
position: (180.0, 138.0)
position: (179.0, 137.0)
position: (179.0, 137.0)
position: (177.0, 137.0)
position: (175.0, 136.0)
position: (172.0, 135.0)
position: (169.0, 134.0)
...
position: (0.0, 1.0)
position: (0.0, 1.0)
position: (0.0, 1.0)
position: (0.0, 1.0)
position: (0.0, 1.0)
position: (0.0, 1.0)
position: (0.0, 1.0)
position: (0.0, 1.0)

[stephengold]

The tests I ran on 16 August were with LWJGL v3.4.1+2.

Today I re-tested using JME v3.10.0-beta1, LWJGL v2.9.5, and AppSettings.LWJGL_OPENGL32. I did not observe this issue, so I believe it is specific to jme3-lwjgl3.

[stephengold]

I tried commenting out this invocation of centerVisibleCursor():

jmonkeyengine/jme3-lwjgl3/src/main/java/com/jme3/input/lwjgl/SdlMouseInput.java

Line 385 in c40043a

centerVisibleCursor();

but that didn't solve this issue.

[stephengold]

Bisection indicates this issue originated with PR #2585.

@riccardobl: Do you have input regarding this issue?