Added Window Position for LJWGL3 libraries

jme3-core/src/main/java/com/jme3/system/AppSettings.java

@@ -266,6 +266,7 @@ public final class AppSettings extends HashMap<String, Object> {
     public static final String JOAL = "JOAL";
 
     static {
+        defaults.put("CenterWindow", true);
         defaults.put("Width", 640);
         defaults.put("Height", 480);
         defaults.put("BitsPerPixel", 24);
@@ -290,6 +291,8 @@ public final class AppSettings extends HashMap<String, Object> {
         defaults.put("OpenCL", false);
         defaults.put("OpenCLPlatformChooser", DefaultPlatformChooser.class.getName());
         defaults.put("UseRetinaFrameBuffer", true);// MacOS spec
+        defaults.put("WindowYPosition", 0);
+        defaults.put("WindowXPosition", 0);
         //  defaults.put("Icons", null);
     }
 
@@ -1350,4 +1353,91 @@ public boolean isUseRetinaFrameBuffer() {
     public void setUseRetinaFrameBuffer(boolean useRetinaFrameBuffer) {
         putBoolean("UseRetinaFrameBuffer", useRetinaFrameBuffer);
     }
+
+    /**
+     * Tests the state of the Center Window flag.
+     *
+     * <p>The Center Window flag is used only with LWJGL3 and has no effect on
+     * fullscreen windows.
+     *
+     * @return true to center the window on the desktop, false to position the
+     *    window at (WindowXPosition, WindowYPosition)
+     * @see #setCenterWindow(boolean)
+     */
+    public boolean getCenterWindow() {
+        return getBoolean("CenterWindow");
+    }
+
+    /**
+     * Enables or disables the Center Window flag.
+     *
+     * <p>The Center Window flag is used only with LWJGL3 and has no effect on
+     * fullscreen windows. It defaults to true.
+     *
+     * @param center true to center the window on the desktop, false to position
+     *     the window at (WindowXPosition, WindowYPosition)
+     */
+    public void setCenterWindow(boolean center) {
+        putBoolean("CenterWindow", center);
+    }
+
+    /**
+     * Gets the window's initial X position on the desktop.
+     *
+     * <p>This setting is used only with LWJGL3, has no effect on fullscreen
+     * windows, and is ignored if the Center Window flag is true.
+     *
+     * @return the initial position of the window's left edge relative to the
+     *     left edge of the desktop
+     * @see #setCenterWindow(boolean)
+     * @see #setWindowXPosition(int)
+     */
+    public int getWindowXPosition() {
+        return getInteger("WindowXPosition");
+    }
+
+    /**
+     * Sets the window's initial X position on the desktop.
+     *
+     * <p>This setting is used only with LWJGL3, has no effect on fullscreen
+     * windows, and is ignored if the Center Window flag is true. Its default
+     * value is 0.
+     *
+     * @param pos the desired initial position of the window's left edge
+     *     relative to the left edge of the desktop
+     * @see #setCenterWindow(boolean)
+     */
+    public void setWindowXPosition(int pos) {
+        putInteger("WindowXPosition", pos);
+    }
+
+    /**
+     * Gets the window's initial Y position on the desktop.
+     *
+     * <p>This setting is used only with LWJGL3, has no effect on fullscreen
+     * windows, and is ignored if the Center Window flag is true.
+     *
+     * @return the initial position of the window's upper edge relative to the
+     *     upper edge of the desktop
+     * @see #setCenterWindow(boolean)
+     * @see #setWindowYPosition(int)
+     */
+    public int getWindowYPosition() {
+        return getInteger("WindowYPosition");
+    }
+
+    /**
+     * Sets the window's initial Y position on the desktop.
+     *
+     * <p>This setting is used only with LWJGL3, has no effect on fullscreen
+     * windows, and is ignored if the Center Window flag is true. Its default
+     * value is 0.
+     *
+     * @param pos the desired initial position of the window's upper edge
+     *     relative to the upper edge of the desktop
+     * @see #setCenterWindow(boolean)
+     */
+    public void setWindowYPosition(int pos) {
+        putInteger("WindowYPosition", pos);
+    }
 }

jme3-lwjgl3/src/main/java/com/jme3/system/lwjgl/LwjglWindow.java

@@ -276,11 +276,17 @@ public void invoke(final long window, final boolean focus) {
             }
         });
 
-        // Center the window
         if (!settings.isFullscreen()) {
-            glfwSetWindowPos(window,
-                    (videoMode.width() - settings.getWidth()) / 2,
-                    (videoMode.height() - settings.getHeight()) / 2);
+            if (settings.getCenterWindow()) {
+                // Center the window
+                glfwSetWindowPos(window,
+                        (videoMode.width() - settings.getWidth()) / 2,
+                        (videoMode.height() - settings.getHeight()) / 2);
+            } else {
+                glfwSetWindowPos(window,
+                        settings.getWindowXPosition(),
+                        settings.getWindowYPosition());
+            }
         }
 
         // Make the OpenGL context current