https://bugs.freedesktop.org/show_bug.cgi?id=66067
--- Comment #20 from Marek Olšák maraeo@gmail.com --- (In reply to comment #19)
By the way, I really wonder how this manages to work correctly with the blobs. Are they fixing up the shader on demand somehow?
No idea. Catalyst should be broken too unless it recompiles shaders. The GL spec says that if GL_TEXTURE_COMPARE_MODE doesn't match the sampler type, the behavior is undefined.