DESCR: An OpenGL and OpenGL ES shader front end and validator. There are several components: A GLSL/ESSL front-end for reference validation and translation of GLSL/ESSL into an AST. An HLSL front-end for translation of a broad generic HLL into the AST. A SPIR-V back end for translating the AST to SPIR-V. A standalone wrapper, glslangValidator, that can be used as a command-line tool for the above.