LambdaCube 3D/Lobby

lambdacube 3d dev and user channel

Anthony Cerruti

@srnb_gitlab

Should I be creating a new ede file? https://github.com/lambdacube3d/lambdacube-ir/blob/master/ddl/templates/data.hs.ede

Csaba Hruska

@csabahruska

lambdacube-ir repo has a Haskell based EDSL solution for cross language data serialization, the repo also contains the lambdacube data type specs in that EDSL. Each language has a corresponding template file. Ede is a haskell library for text templates.

so lambdacube-ir covers only the graphics pipeline data type specs and serialization part

lambdacube-gl and purescript-lambdacube-webgl are handwritten backends and they rely on lambdacube-ir types

generated-backends was an experiment to generate gles 2.0 backend for multiple languages and platforms

Csaba Hruska

@csabahruska

if you plan to write the gles 2.0 kotlin android backend by hand (preferred way), then you'll need to add support for kotlin in lambdacube-ir

and you do not have to deal with the generated-backend repo because it is not for manually written backends

this is the main codegen module for the data serialization EDSL:
https://github.com/lambdacube3d/lambdacube-ir/blob/master/ddl/Generate.hs

these are the lambdacube data type specs: https://github.com/lambdacube3d/lambdacube-ir/blob/master/ddl/Definitions.hs

the compiler and the backends rely strictly on the generated data types and their serializers

again: do not try to add kotlin support for the generated-backends repo, it is a complex task to make it right

Csaba Hruska

@csabahruska

it is not fun

write the backend part manually and add kotlin support for lambdacube-ir data serialzier EDSL

Anthony Cerruti

@srnb_gitlab

:+1:

So to summarize, and make sure I'm understanding it correctly: Add Kotlin to the IR/EDSL and write the GLES20 parts manually? @csabahruska

Csaba Hruska

@csabahruska

yep

Anthony Cerruti

@srnb_gitlab

sealed class StreamData ()

data class StreamData ( 
  val streamData : Map<String, ArrayValue>,

  val streamType : Map<String, InputType>,

  val streamPrimitive : FetchPrimitive,

  val streamPrograms : Array<ProgramName>,
 ): StreamData ()

It doesn't look too pretty, but it's working (a bit)

Csaba Hruska

@csabahruska

postprocess it with a kotlin code formatter

Anthony Cerruti

@srnb_gitlab

Ah, I've just fixed the EDE

So it's nice and tidy

Csaba Hruska

@csabahruska

good!

well done

Anthony Cerruti

@srnb_gitlab

https://mystb.in/pejijoqexa.kt Here's a sample of the first half of stuff right now

Still have to do the JSON and the RT stuff

Oops, I broke things with one field

Anthony Cerruti

@srnb_gitlab

https://mystb.in/otutosebiz.kt Fixed it

Anthony Cerruti

@srnb_gitlab

The question now is how to implement the JSON stuff

Anthony Cerruti

@srnb_gitlab

What does "correct" JSON input/output look like? This looks pretty enticing, but the downfall of it is that optimizers like Proguard on Android are going to have to be configured specifically for it.

The Java backend uses org.json/JSON-java, which is the most portable, so I should probably just copy that

Csaba Hruska

@csabahruska

use the platform default json library

the json format is fixed in the EDSL though

the goal is to be platfom idiomatic as much as possible

Anthony Cerruti

@srnb_gitlab

I'll use JSON-java then

I.e. what the Java backend uses

Csaba Hruska

@csabahruska

is it the de facto json lib for kotlin on android?

if so, then use that

Anthony Cerruti

@srnb_gitlab

It's included by default on Android

Because Kotlin doesn't require separate files, should I implement the JSON logic in data.kt.ede? @csabahruska

Csaba Hruska

@csabahruska

haskell and purescript generator/templates does that, but it is simple in those cases:
https://github.com/lambdacube3d/lambdacube-ir/blob/master/ddl/templates/data.purs.ede#L61-L84

Anthony Cerruti

@srnb_gitlab

Ohhh, because those are instance based I'm gonna have some issues with making it in the data.kt.ede

Because the Java aspect is one giant singleton

So yeah, I'll need to make it a separate file

Csaba Hruska

@csabahruska

ok, java generator does separate file codegen for the serializer

Anthony Cerruti

@srnb_gitlab

@csabahruska Is there a "test case" for backends? I.e. some program where it's easy to see whether a backend is working fully and correctly?

Csaba Hruska

@csabahruska

not for mobiles (started to work on, not finished)

https://github.com/lambdacube3d/lambdacube-compiler/tree/master/backendtest

Anthony Cerruti

@srnb_gitlab

I'll see what I can do; I feel very likely to get stuck on implementing it into something but I'll take a look at the C++ example and the existing Java code

Csaba Hruska

@csabahruska

also check purescript webgl

that is working

in the online editor

Anthony Cerruti

@srnb_gitlab

I haven't been able to digest the purescript as of yet (I can't figure out where some of the functions are coming from), but I'll give it another go once I've finished toJSON

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