Crate glsl

GLSL compiler

This crate is a GLSL450 compiler. It’s able to parse valid GLSL450 formatted source into an abstract syntax tree (AST). That AST can then be transformed into SPIR-V, your own format or even folded back to a raw GLSL String (think of a minifier, for instance).

You’ll find several modules:

• parser, which exports the parsing interface.
• syntax, which exports the AST and language definitions.
• transpiler, which provides you with GLSL transpilers.
• visitor, which gives you a way to visit AST nodes and mutate them, both with inner and outer mutation.

Feel free to inspect those modules for further information.

Parsing architecture

Basically, the Parse trait gives you all you need to start parsing. This crate is designed around the concept of type-driven parsing: parsers are hidden and you just have to state what result type you expect.

The most common type you want to parse to is TranslationUnit, which represents a set of ExternalDeclarations. An ExternalDeclaration is just a declaration at the top-most level of a shader. It can be a global, uniform declarations, vertex attributes, a function, a structure, etc.

The crate is also getting more and more combinators and functions to transform the AST or create nodes with regular Rust. The Visitor trait will be a great friend of yours when you will want to cope with deep mutation, filtering and validation.

Modules

parser	GLSL parsing.
syntax	GLSL abstract syntax tree and grammar.
transpiler	GLSL transpilers – i.e. going from GLSL to anything else.
visitor	AST visitors (i.e. on-the-fly mutation at different places in the AST).