WebAssembly COBOL Pong • Hacker News Board

Re: WebAssembly COBOL Pong

#11

Post by hardmaru » Fri, May 15, 2020, 9:06 AM UTC

I heard COBOL skills are in demand these days in the US.

Re: WebAssembly COBOL Pong

#12

Post by TurboHaskal » Fri, May 15, 2020, 9:18 AM UTC

For player 2, 'J' goes up, while pressing 'L' goes to the left from the perspective of the paddle. This feels like made in purpose to hurt vi users.

Re: WebAssembly COBOL Pong

#13

Post by tgv » Fri, May 15, 2020, 9:28 AM UTC

hardmaru wrote: post #11

I heard COBOL skills are in demand these days in the US.

And now you know why: to reboot Half Life in the browser, leveraging a well-known, time-tested programming language with wide and deep support.

Re: WebAssembly COBOL Pong

#14

Post by ptx » Fri, May 15, 2020, 9:29 AM UTC

Cool!

What's the deal with the alternator function (in app.js)? Why should keypresses be read only on every other attempt?

Also, is there some kind of implicit sleep or requestAnimationFrame somewhere? Or is it busy-looping and polling for key presses as fast as it can?

Re: WebAssembly COBOL Pong

#15

Post by moxon6 » Fri, May 15, 2020, 9:34 AM UTC

ptx wrote: post #14

Cool! What's the deal with the alternator function (in app.js)? Why should keypresses be read only on every other attempt? Also, is there some kind of implicit sleep or requestAnimationFrame somewhere? Or is it busy-looping and polling for key presses as fast as it can?

The emscripten JS will keep "prompt"ing for new input until it receives a null (due to the user pressing escape on the dialog)

This is just a hack around that to simulate entering a value and then pressing escape on the next prompt request

Re: WebAssembly COBOL Pong

#16

Post by elpg454 » Fri, May 15, 2020, 9:57 AM UTC

When I view the source code, it's just a javascript file,

https://moxon6.github.io/cobol-js-emscripten/cobol-js/index....

where is the cobol?

Re: WebAssembly COBOL Pong

#17

Post by madballster » Fri, May 15, 2020, 9:58 AM UTC

sandov wrote: post #10

Right paddle controls are backwards compared to vim.

A hidden swipe at evil/vim fans by an emacs author?

Re: WebAssembly COBOL Pong

#18

Post by brainless » Fri, May 15, 2020, 10:02 AM UTC

elpg454 wrote: post #16

When I view the source code, it's just a javascript file, https://moxon6.github.io/cobol-js-emscripten/cobol-js/index.... where is the cobol?

You mean this file?

https://github.com/moxon6/cobol-js-emscripten/blob/master/co...

I am still looking around so may be wrong.

Re: WebAssembly COBOL Pong

#19

Post by elpg454 » Fri, May 15, 2020, 10:07 AM UTC

brainless wrote: post #18

elpg454 wrote: post #16

When I view the source code, it's just a javascript file, https://moxon6.github.io/cobol-js-emscripten/cobol-js/index.... where is the cobol?

You mean this file? https://github.com/moxon6/cobol-js-emscripten/blob/master/co... I am still looking around so may be wrong.

I was looking to see how it is included on the actual website, do you reference a web assembly file from javascript ?

Re: WebAssembly COBOL Pong

#20

Post by moxon6 » Fri, May 15, 2020, 10:24 AM UTC

elpg454 wrote: post #16

When I view the source code, it's just a javascript file, https://moxon6.github.io/cobol-js-emscripten/cobol-js/index.... where is the cobol?

That's the JS generated by emscripten for linking in the WASM, which is `index.wasm`

`index.wasm` is built using the build scripts in the source repo

`main.cob` contains the main logic used to generate `index.wasm`

https://github.com/moxon6/cobol-js-emscripten/blob/master/co...