Re: NVIDIA releases OpenGL 4.2 drivers
It is legal. The "binding" part isn't covered in the ARB_shader_image_load_store extension, because the binding feature for samplers and images is in ARB_shading_language_420pack.
Originally Posted by Chris Lux
I'll be investigating further tomorrow, but it appears that the problem involves a combination of qualifiers. A test shader I wrote based on your example above, fails with the declaration as above, but compiles successfully without the "writeonly" qualifier.