<html><head><meta http-equiv="content-type" content="text/html; charset=us-ascii"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div><blockquote type="cite"><div><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">I mean, constants like "1 / 2.75" will sure be evaluated at compile time.<br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">And even if not, it's just a division, nothing expensive.<br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"></div></blockquote><div> </div><div>Do you know where in the docs it says that will happen? I couldn't find anything as reassurance, and I assumed then that a floating point division would take place, at that point, every time, which feels inefficient, given that it is in fact a constant and should require zero calculation at runtime. </div><div> </div><div>Expensive is relative I guess. I come from the days when a 1MHz CPU was considered exotic.</div><div> </div> <blockquote type="cite"><div><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">Volker<br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><blockquote type="cite" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"> Volker Am Freitag, dem 18.08.2023 um 09:26 +0100 schrieb Sean Charles (emacstheviking): <blockquote type="cite">I am currently working on a simple 2D game engine using raylib, all good. I'm implementing a tweening library based on -the- easing equations by Robert Penner. The ones I need I have implemented, but I don't think I will need the complete set. On implementing the easeInBounce, easeOutBounce and easeInOutBounce, using this as my guide, the raylib Rust easing source: https://docs.rs/raylib/latest/src/raylib/ease.rs.html#242-256 , I noticed that there are some constants which I decided I didn't want to have to recalculate at run time. In a game loop, anything you can do to save pointless repetition means more rendering time between frames. This MIGHT be over eager optimisation I guess as all I am doing at the moment is a simple proof-of-concept for a 2D engine which I will then port over as the core of my transpiler IDE I have started. Here is what I ended up for as the implementation of easeOutBounce, I decided to use the apostrophe naming rule so that the code reads like the source code, and I also did this because I wasn't really sure what those constants are for, I have a rough idea but I couldn't decide on an effectively communicable name for the source so I opted to call them what they do! tween_(bounce_out, Time, Range, Duration) = V :- Percent = Time / Duration, ( if Percent < '1 / 2.75' then V = Range * n1 * Percent * Percent else if Percent < '2 / 2.75' then Td1 = Percent - '1.5 / 2.75', V = Range * ( n1 * Td1 * Td1 +0.75 ) else if Percent < '2.5 / 2.75' then Td1 = Percent - '2.25 / 2.75', V = Range * ( n1 * Td1 * Td1 +0.9375 ) else Td1 = Percent - '2.625 / 2.75', V = Range * ( n1 * Td1 * Td1 + 0.984375 ) ), trace [io(!IO)] ( io.format("bounce_out: %f\n", [f(V)], !IO) ). The above code then make suse of the following constants, I read somewhere that small functions are automatically inlined (but not 100% sure I read it) so I explicitly made then inlined, the idea being that at runtime, referential transparency would be applied, like in Haskell... % Bounce constants. :- pragma inline(func(n1/0)). :- func n1 = (float::out) is det. n1 = 7.5625. :- pragma inline(func(d1/0)). :- func d1 = (float::out) is det. d1 = 2.75. :- pragma inline(func('1.5 / 2.75'/0)). :- func '1.5 / 2.75' = (float::out) is det. '1.5 / 2.75' = 0.5454. :- pragma inline(func('1 / 2.75'/0)). :- func '1 / 2.75' = (float::out) is det. '1 / 2.75' = 0.3636. :- pragma inline(func('2 / 2.75'/0)). :- func '2 / 2.75' = (float::out) is det. '2 / 2.75' = 0.7272. :- pragma inline(func('2.25 / 2.75'/0)). :- func '2.25 / 2.75' = (float::out) is det. '2.25 / 2.75' = 0.8181. :- pragma inline(func('2.5 / 2.75'/0)). :- func '2.5 / 2.75' = (float::out) is det. '2.5 / 2.75' = 0.909. :- pragma inline(func('2.625 / 2.75'/0)). :- func '2.625 / 2.75' = (float::out) is det. '2.625 / 2.75' = 0.9545. My question is simple this: is what I have done 'ok' or is it a diabolical insult to all that as beautiful and holy in the Mercury world? Could I have used some other aspect / feature of the language? Thanks Sean _______________________________________________ users mailing list users@lists.mercurylang.org https://lists.mercurylang.org/listinfo/users </blockquote> _______________________________________________ users mailing list users@lists.mercurylang.org https://lists.mercurylang.org/listinfo/users </blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">_______________________________________________<br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">users mailing list<br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><a href="mailto:users@lists.mercurylang.org" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">users@lists.mercurylang.org</a><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><a href="https://lists.mercurylang.org/listinfo/users" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">https://lists.mercurylang.org/listinfo/users</a></div></blockquote></div> </body></html>