Fixed issue when with several monitors

[FolloW12587]

Hey!

I noticed an issue where the snow effect doesn’t work correctly on the secondary screen.

Issues

• If the active window is on the left screen the right screen mirrors left one
• If the active window is on the right screen - it doesn't work at all

Reason

The shader was working with each screen separately, and the coordinates of the snowflakes are local to each screen. Meanwhile, Uniforms.windowRect which is send in updateSnowflakes has global coordinates for all combined screens.

Solution

To fix this, I added a conversion of the window coordinates from global to local. So I've added the calculation of the global 'united' display and pass it to each screens' renderer with the origin of each screen, so it can calculate local coordinate of point in global coordinate system.

[BarredEwe]

Hi! I checked it, it works perfectly. Thanks for the fix.

#3