Before launching configure enviroment (via schemes in case of Xcode) as: VK_ICD_FILENAMES = /vulkansdk/macOS/etc/vulkan/icd.d/MoltenVK_icd.json VK_LAYER_PATH = /vulkansdk/macOS/etc/vulkan/explicit_layer.d
Also set a working dir as root of repository. Shaders are searched relative to the project root.