Thanks Jay, I hope I'm not abusing the terminology. If I have a sprite that is a line, and it's rotated a bit, then is that not similar to a polygon edge not falling on pixel boundaries?
As an example, I've attached a test program and a screenshot of the rotated and scaled down line segment. This is the sort of thing I'm worried about. Any advice? I didn't know that mode-lambda made sure that each pixel only came from a single sprite. Even if some sprites have some transparency? Thanks, Dave On Mon, Nov 14, 2016 at 2:20 PM, Jay McCarthy <jay.mccar...@gmail.com> wrote: > Hi David, > > I know what anti-aliasing is, but I don't think I know how you mean it > to apply for mode-lambda. > > mode-lambda renders a W1xH1 scene onto a W2xH2 canvas and by default > uses a scaling algorithm that is "pixel-perfect" and could be made to > be more fuzzy. Right now, it offers two scalers and could offer more. > > Within a particular rendering, mode-lambda can return a WxH sprite > with some scaling applied (the #:mx and #:my parameters) and it again > does it in a "pixel-perfect" way. This is a pretty deep assumption, > but in principle could be changed. > > In normal 3D graphics engines, anti-aliasing is used because polygon > edges (lines) do not even fall on pixel boundaries, so there are > subtle techniques to figure how they line up well. Given that > mode-lambda only renders rectangles and guarantees that within a layer > every pixel comes from exactly one sprite, I think the normal things > would apply less well. I think this is assumption of mode-lambda that > you want changed so that a rotated sprite would combine its pixel > value with the other sprite sharing a portion of the same location > given that the ultimate rendering canvas would accommodate them? > > Jay > > > > > > > On Mon, Nov 14, 2016 at 1:57 PM, David Vanderson > <david.vander...@gmail.com> wrote: > > I'm working on converting my game to use mode-lambda, and it's going > pretty > > well so far, but I'd like to get smoother rendering of sprites rotated & > > scaled. > > > > I was hoping that (send gl-config set-multisample-size 4) would take > care of > > it. That works for some raw opengl stuff I've tried, but not for > > mode-lambda. > > > > Is there some switch I've missed? Or does this need deeper changes to > the > > shaders? I'm happy to dig into it but wanted to make sure I wasn't > missing > > something obvious. > > > > Thanks, > > Dave > > > > -- > > You received this message because you are subscribed to the Google Groups > > "Racket Users" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to racket-users+unsubscr...@googlegroups.com. > > For more options, visit https://groups.google.com/d/optout. > > > > -- > Jay McCarthy > Associate Professor > PLT @ CS @ UMass Lowell > http://jeapostrophe.github.io > > "Wherefore, be not weary in well-doing, > for ye are laying the foundation of a great work. > And out of small things proceedeth that which is great." > - D&C 64:33 > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
ml-line.rkt
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