setMousePosition does not work on Wayland

[PierrickKoch]

in src/morse/blender/view_camera.py

setMousePosition does not work on Wayland (Fedora 26)

Result in unusable FPS view (using left CTRL)

[severin-lemaignan]

You probably want to report that upstream...

[PierrickKoch]

of course :) I will when I find time to reproduce it with minimal example, I'll keep track of any update here

[PierrickKoch]

here is a workaround, I'll open PR soon

diff --git a/src/morse/blender/view_camera.py b/src/morse/blender/view_camera.py
index da36f619..1e7c43db 100644
--- a/src/morse/blender/view_camera.py
+++ b/src/morse/blender/view_camera.py
@@ -18,6 +18,7 @@ from morse.core import blenderapi
 start_position = []
 start_orientation = []
 keyboard_ctrl_objects = []
+last_mouse_pose = None

 robots = []
 current_robot = 0
@@ -164,49 +165,36 @@ def rotate(contr):
                 # Hide the cursor while we control the camera
                 mouse_visible = False
                 if mouse.positive:
-                    # get width and height of game window
-                    width = blenderapi.render().getWindowWidth()
-                    height = blenderapi.render().getWindowHeight()
-
                     # get mouse movement from function
-                    move = mouse_move(camera, mouse, width, height)
-
+                    move = mouse_move(mouse)
                     # set mouse sensitivity
                     sensitivity = camera['Sensitivity']
-
                     # Amount, direction and sensitivity
                     leftRight = move[0] * sensitivity
                     upDown = move[1] * sensitivity
-
                     # set the values
                     camera.applyRotation( [0.0, 0.0, leftRight], 0 )
                     camera.applyRotation( [upDown, 0.0, 0.0], 1 )

-                    # Center mouse in game window
-                    # Using the '//' operator (floor division) to produce an integer result
-                    blenderapi.render().setMousePosition(width//2, height//2)
-
     # Set the cursor visibility
     blenderapi.mousepointer(visible = mouse_visible)
+    if mouse_visible:
+        global last_mouse_pose
+        last_mouse_pose = None

-def mouse_move(camera, mouse, width, height):
-    """ Get the movement of the mouse as an X, Y coordinate. """
-    # distance moved from screen center
-    # Using the '//' operator (floor division) to produce an integer result
-    x = width//2 - mouse.position[0]
-    y = height//2 - mouse.position[1]
-    
-    # intialize mouse so it doesn't jerk first time
-    try:
-        camera['mouseInit']
-    except KeyError:
-        x = 0
-        y = 0
-        # bug in Add Property
-        # can't use True.  Have to use 1
-        camera['mouseInit'] = 1

+def mouse_move(mouse):
+    """ Get the movement of the mouse as an X, Y coordinate. """
+    global last_mouse_pose
+    if not last_mouse_pose:
+        # intialize mouse so it doesn't jerk first time
+        last_mouse_pose = mouse.position
+        return 0, 0
+
+    # distance moved from last pose
+    x = last_mouse_pose[0] - mouse.position[0]
+    y = last_mouse_pose[1] - mouse.position[1]
     logger.debug("Read displacement: %s, %s" % (x, y))
-    
+    last_mouse_pose = mouse.position
     # return mouse movement
     return x, y

[PierrickKoch]

Here is the ticket on d.b.o : https://developer.blender.org/T54238