#racket on 2019-06-16 — irc logs at freenode.irclog.whitequark.org

2019-05-22 02:51 samth changed the topic of #racket to: Racket v7.3 has been released: https://blog.racket-lang.org/2019/05/racket-v7-3.html -- Racket -- https://racket-lang.org -- https://pkgs.racket-lang.org -- Paste at http://pasterack.org

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09:40 <zipper> Hello, anyone home?

09:40 <zipper> So I've noticed that my repl doesn't have some basic functions like emtpty and enter

09:41 <zipper> the repl that opens in emacs

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10:57 <zipper> Hello

10:57 <zipper> So I have this issue in that the racket repl in emacs doesn't have some functions such as enter! or constants such as empty

10:57 <zipper> I'm using racket layer from spacemacs

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13:35 <greghendershott> later tell zipper Try `(require racket)`. If you open the REPL w/o any file, it is just `#lang racket/base`.

13:35 <greghendershott> derp

13:36 <greghendershott> rudybot: later tell zipper Try `(require racket)`. If you open the REPL w/o any file, it is just `#lang racket/base`.

13:36 <rudybot> greghendershott: I asked `MemoServ' to forward the message to zipper.

13:38 <greghendershott> rudybot: later tell zipper The main, intended use of the REPL is to M-x racket-run a specific file. Whereas if you M-x racket-repl it gives you an "empty" racket/base namespace.

13:38 <rudybot> greghendershott: I asked `MemoServ' to forward the message to zipper.

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15:24 <dzoe> I might have asked before, but I'll try it anyway. Has anyone here tried creating bindings for Vulkan?

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15:43 <efm> dzoe: looking around I don't see racket specific bindings, but I do find racket/OpenGL (sgl/gl) and other functional languages/Vulkan https://projekter.aau.dk/projekter/files/281491858/final.pdf

15:43 <efm> that link has a recent literature review

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16:52 <dzoe> efm: I've done a few projects in Racket's sgl/gl, it is just that I am pondering a new project which requires semi-wireframe rendering with some weird stuff and to be honest, doing it in Cairo is probably the easiest way to do it.

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16:52 <dzoe> However it's going to be slow as hell with SW rendering (tested).

16:52 <soegaard> dzoe: Bindings for Vulcan would be cool.

16:53 <soegaard> There is an objective C FFI which is used for the binding on macOS.

16:53 <soegaard> https://docs.racket-lang.org/foreign/Objective-C_FFI.html?q=objective

16:53 <soegaard> Also: https://docs.racket-lang.org/foreign/ns.html?q=objective

16:54 <dzoe> soegaard: I was wondering whether a pure ffi (ffi/unsafe) interface would be possible cross-platform.

16:55 <soegaard> I was so ignorant that I thought Vulcan was a macOS only thing.

16:55 <soegaard> Yes, if there is a C interface that would be best.

16:55 <dzoe> That was Metal, wasn't it?

16:55 <soegaard> Ah!

16:55 <dzoe> Vulkan is based both on Metal and OpenGL

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16:55 <dzoe> "based on" ...

16:56 <dzoe> And that thing from AMD

16:56 <dzoe> Mantle! That's the last thing.

16:56 <dzoe> Anyway the API would be probably easily covered with ffi/unsafe, however setting things up might require platform-specific code.

16:57 <dzoe> My little venture into tiocgwinsz, ioctl and termios taught me a lot :)

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16:59 <soegaard> A few tutorials on how to write FFIs would be nice.

17:01 <soegaard> dzoe: FWIW sometimes it helps to see how the bindings are made in other languages (lua, python, and similar).

17:02 <dzoe> I've looked at Haskell bindings briefly it seems pretty straightforward.

17:02 <dzoe> If I have the time, I'll look into the current sgl/gl and think about it for a while.

17:02 <soegaard> Are they generated automatically? (I think, that's what happens with the Python binding) https://github.com/KhronosGroup/Vulkan-Docs/tree/master/xml

17:03 <soegaard> If they have xml files that describes the function, it would help a lot.

17:04 <dzoe> Yep, it uses the XML registry too.

17:04 <dzoe> And actually I really like the way Khronos documents the API in machine-readable form.

17:05 <soegaard> +1

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17:27 <soegaard> Do Apple also have XML descriptions of their apis ?

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17:47 <aeth> And if you want to run Vulkan on macOS: https://moltengl.com/moltenvk/

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