1layout(metal, vulkan, webgpu, direct3d, binding = 0) uniform ubo { float f; }; // multiple backends 2layout(texture=0, sampler=0) sampler2D s; // missing backend 3 4/*%%* 5only one backend qualifier can be used 6layout qualifier 'texture' is not permitted here 7layout qualifier 'sampler' is not permitted here 8*%%*/ 9