Graphics not properly scaled on high dpi screen on Mac

[aviks]

Graphics not properly scaled on high dpi screen on Mac

[rekabrnalla]

I also see this problem on Mac OS. I have an M1 Mac Mini with macOS Ventura. 13.1. 32-inch (3840 × 2160)
Version 0.3.1 of game zero.jl

I have to add the *2 to the mouse position to make the cursor properly track. The window is drawn twice as big as it should be. The lines are only in the 1st quadrant and do not fill the window.

Also I cannot close the window by x-ing out of it. It hangs around even though the prompt comes back in Julia.

Example code below that can be put into a file and run with gamezero.

# initialize screen

WIDTH = 600
HEIGHT = 600
BACKGROUND = colorant"antiquewhite"

# define initial state of actors

hline = Line(0, 300, 600, 300)
vline = Line(300, 0, 300, 600)
mouse = Circle(300,300,50)


function draw(g::Game)
    draw(hline, colorant"black")
    draw(vline, colorant"black")
    draw(mouse, colorant"blue", fill=true)
end


#define mouse inputs
 function on_mouse_move(g::Game, pos)
    mouse.x = pos[1]*2
    mouse.y = pos[2]*2
 end

[aviks]

Yes, unfortunately I haven't been able to find a fix for this yet.

I use GameZero/SDL2 on Windows with a HiDPI display, and it works correctly. It even works with fractional scaling (my monitors are set to 175% and 150% scaling).

SO suggests the corrent way to handle this in SDL is to set SDL_WINDOW_ALLOW_HIGHDPI when creating windows, which we do use here , and that seems to work correctly on windows.

Would appreciate any ideas or investigations.

[rekabrnalla]

So is there a change to the code above that I need to make to resolve it or is it just unusable on MAC.

We just need to pass this issue to the SimpleDirectMediaLayer people? Or is there a different combination of switches that MACOS need?