This is a GLSL parser implemented with flex and bison. The grammar is based on the OpenGL 4.5 reference specs. The parser generates an AST represented in C data structures. The AST structure is documented in AstNodes.md.

The header file glsl_parser.h documents the interface to the parser and the header file glsl_ast.h defines some useful functions for working with the AST it generates.

The included Makefile builds a test program that reads a shader from a file or standard input and prints out a human readable version of the shader's AST and attempts to regenerate the input shader from the AST.

Some features provided by GLSL was not implemented in original sources. For example, compiler directives. So I have converted extra rules got from antlr4