perfect resolution camera/window

Unity Engine
1

I’m trying to make it so that trying to scale up the game will just take the game (at 160 x 144 Pixels) and just jump to the next perfect resolution( 320 x 288, 480 x 432, 640 x 576, ect…) instead of just stretching out the game,
but if possible i would like to fill the edges with a background texture until the window stretches out to a possible resolution then make the jump to it so that full screen is still possible.

I’m happy to clarify if its needed.

2

Choose an aspect ratio, then you can do something like this:

void Start()  {
        cam = GetComponent<Camera>();
        var targetaspect = 4.0f / 3.0f;
        var windowaspect = (float) Screen.width / (float) Screen.height;
        var scaleheight = windowaspect / targetaspect;
        var rect = cam.rect;
        if (scaleheight < 1.0f) {
            rect.width = 1.0f;
            rect.height = scaleheight;
            rect.x = 0;
            rect.y = (1.0f - scaleheight) / 2.0f;
        } else {
            var scalewidth = 1.0f / scaleheight;
            rect.width = scalewidth;
            rect.height = 1.0f;
            rect.x = (1.0f - scalewidth) / 2.0f;
            rect.y = 0;
        }
        cam.rect = rect;
    }
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