Classic Macintosh has an easily accessible fixed-point math library. Including from THINK Pascal. If you're thinking of doing 2D graphics or gameplay mechanics/physics/logic, you'll probably want to use it instead of floating point.

· · Web · 3 · 9 · 15

Oh, also, the sine wave here looks pixel-imperfect because I'm only sampling once it every 3 columns. As a demo of a cost-saving measure :) The precision is good enough that it would look perfect if you sampled it every column.

Show thread

@cancel I like how it also shows at which step it's currently at. :)

@cancel Why do we need to include fixMath.p and fixMath.lib? What's a .lib file?

@neauoire .lib is precompiled (or source, too, I think?) code. it doesn't work for you without it, right?

@cancel It doesn't no, looking at FixMath.p it seems like a "header file" for something else. Do you know if a lib file can be opened at all?

@neauoire no. the fixmath.lib is probably completely machine code. there's probably no source for it -- it was likely written entirely in 68k assembly.

@neauoire it would be nice to have the assembly... but it's probably on some backup disk in some closet at Apple since 1990 or something :)

@cancel understood :) I'm glad to have an example that works without sin, but I don't like that this file has dependencies.

@neauoire it came with THINK Pascal 4.0 but it also comes with MPW pascal (with slightly different interface .p file) and the even older mac pascal

@neauoire fixmath came with every dev thing for mac. I think it's mostly code that just points to stuff in the mac's ROM. it's extremely common. way more common than the FPU you're using which induces more dependencies :P

@neauoire correct, you could also use it from C or from 68k assembly. i think fixmath.lib actually doesn't have the full fixed point math routines in it -- I think they're in the Mac ROM and the .lib just points to the locations and maybe has a simple loader init in it, and that's it.

@neauoire not 100% sure on that though. but the .lib seems too small to have stuff like the sin/tan lookup tables.

@neauoire when I get a disassembler working I can look at it :)

@neauoire if you look in the official "Inside Macintosh" development manuals they document this library. so it's pretty important.

@neauoire I actually don't know why it's missing from the 4.5d4 version I originally downloaded. kind of strange. I think the author probably just forgot.

@cancel I need your hand with something. I've been meaning to unsit smalltalk-80, but stuffit example doesn't work if I double-click it, could you try it out?

@neauoire ill do it when i wake up, about to take a nap :)

@cancel yeah, it was a pain in the butt, only to realize that I don't like smalltalk at all.

@cblgh @neauoire I can tell you why I dislike it, if you want :P

@cblgh @cancel Almost everything.

The controls don't work for me since I use a wacom with only 2 buttons.

The environment is very slow and unforgiving, it's really easy to destroy everything by accident, I learnt that the hard way.

And the syntax, I don't like it AT ALL.

Show more
Show more
Sign in to participate in the conversation

Merveilles is a community project aimed at the establishment of new ways of speaking, seeing and organizing information — A culture that seeks augmentation through the arts of engineering and design. A warm welcome to any like-minded people who feel these ideals resonate with them.