Disabling anti-aliasing

ID:2488792
 
Jul 23 2019, 3:19 pm
Resolved
Applies to:
Status: Resolved
This issue has been resolved.
I would like to turn anti-aliasing off for map rendering.

The reason for this, is because it seems impossible to achieve a non-blurry screen zoom effect via:

obj/hud/master_plane
    plane = 0
    appearance_flags = PLANE_MASTER
    screen_loc = "1,1"

    New()
        ..()
        var/matrix/m = new()
        m.Scale(1.25)
        transform = m


It does not matter what zoom value I input, there is always a noticeable blur.

I was suggested by another developer (using another engine) to turn anti-aliasing off to get the same effect they did -- and so here I am.

Thanks for reading.
Jul 23 2019, 3:27 pm
Lummox JR resolved issue
Jul 23 2019, 3:28 pm
PIXEL_SCALE exists for exactly this purpose.
Jul 23 2019, 4:04 pm
Yeah, you're right. Turns out PIXEL_SCALE only achieves the desired effect when using whole numbers for the scaling, otherwise it destroys the pixels.

Jul 23 2019, 8:56 pm
In response to FKI
FKI wrote:
Yeah, you're right. Turns out PIXEL_SCALE only achieves the desired effect when using whole numbers for the scaling, otherwise it destroys the pixels.

Did you expect a different result?
Jul 23 2019, 10:06 pm
Yes and no. I expected a non-blurry scale, but not the ugliness I saw. It wasn't until Zane mentioned something about "bicubic scaling" and needing to use whole numbers, that I found out that feature isn't as simple as the reference suggests.
Jul 24 2019, 1:11 pm
I've clarified the reference entry for that in 513's ref. PIXEL_SCALE uses nearest-neighbor sampling. When you use non-whole-number scaling, or rotations, you'll see a lot of distortion.

I believe what you really want is something like the nice-upscale shader that BYOND uses in the map renderer by default. This shader uses four carefully placed samples to act as though it's upscaling via nearest-neighbor to the next whole number, then downscaling via linear sampling to the correct size.