GLSL Language Parsers for Java?

homac · May 8, 2017, 4:42pm

I’m looking for an open source GLSL parser preferably producing an abstract syntax tree.

What we found so far:

glsl4idea: IntelliJ plugin. Too many dependencies on IntelliJ code, but language description for FLEX might be useful.
glslang: Reference implementation of a GLSL compiler in C, by Khronos Group. Contains language description for Bison.
fragbyte: GLSL to bytecode compiler based on ANTLR4. Uses AST for bytecode representation. Rule set possibly useful.
antlr4_convert: Compiler based on ANTLR4, which converts between GLSL and HLSL.

Does anybody of you know of some others? Maybe integrated in graphics/game engines?

CoDi_R · May 8, 2017, 8:33pm

Seems there is no “official” GLSL grammar for ANTLR, but Google points me to a few Github projects:

github.com

divanburger/fragbyte/blob/master/grammar/GLSL.g4

grammar GLSL;

@header {
import java.util.Stack;

import whitesquare.glslcross.ast.*;
import whitesquare.glslcross.ast.optimizers.*;
}

@members {
private Functions functions = new Functions();
private Variables variables = new Variables();
private LogWriter log = null;
private TypeHelper typeHelper = null;
private ScopeManager scope = new ScopeManager();
private Type tInt;
private Type tFloat;
private Type tVec2;
private Type tVec3;
private Type tVec4;

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https://github.com/labud/antlr4_convert/blob/master/src/GLSL/GLSL.g4

homac · May 9, 2017, 2:24pm

Thanks, CoDi^R. fragbyte looks promising and uses even an AST. Will see.

EDIT: Nope. The AST is for the bytecode which is getting generated by the compiler. But the ANTLR rule set might be a good start.

gouessej · May 15, 2017, 7:18am

Hi

The author of Unlicense Lib probably knows the answer, you should contact him.

homac · May 16, 2017, 4:34pm

@ gouessej: had a look at their repository but didn’t find anything related to GLSL parsing. Also, I couldn’t find a contact address.

Ported the grammar from Khronos’ reference impl to ANTLR4 and extended it by the rules for preprocessing according to ISO C standard (also added #include directive while I’m at it - doesn’t hurt to have it).

The grammar is written. Test coverage is currently at 30%, roughly.

douira · June 3, 2022, 3:22pm

I just stumbled upon this looking for other GLSL parsers. I have written a GLSL parsing and program transformation library in java which you might find helpful: GitHub - IrisShaders/glsl-transformer: An advanced Java library for GLSL parsing, program transformation, and printing that uses ANTLR4. Developed and maintained by @douira.
The grammar I’m using is adapted from the grammar given in the spec and the grammar used by graphicsfuzz.