https://bugs.freedesktop.org/show_bug.cgi?id=93970
--- Comment #2 from Ilia Mirkin imirkin@alum.mit.edu --- Try running with force_glsl_extensions_warn=true in the environment. Looks like the shader tries to use some advanced functionality without enabling the extensions. It checks with #ifdef GL_ARB_gpu_shader5, without enabling the ext, which is unfortunate. My understanding is that the preprocessor macros are set to 1 even when the ext isn't enabled with #extension.