vulkano-rs/Lobby

Ok, I found the problem. vulkano-shaders generates the DescriptorDesc for the shader. When I view the result of macro expansion I can see that it produced this code:

 ty: DescriptorDescTy::Buffer(DescriptorBufferDesc {
                    dynamic: Some(false),
                    storage: false,
                }),

for some strange reason, the storage flag is false. This causes the buffer to be interpreted as UBO which fails because the limit for UBO is 64kb. In the tutorial the buffer contains 64K of u32 - which is over the limit for UBO (64kb). Another problem is that the compute shader does not update the buffer because UBOs are inherently read-only. By Replacing the macro invocation with expanded code and changing the storage flag to true the code magically starts working. If I understand correctly this is because now the buffer is interpreted as storage buffer instead of being the uniform one. This solves both the 64kb issue and the one with CS not changing the buffer.

However I still do not understand what is the reason why vulkan-shaders emitted this (not working) code and whether it is actually a bug ( I would say it is). Another thing that puzzles me is that is also emitted readonly: true, which I am not sure what it means but from what I understand I want to modify contents of the buffer so it seems conter-intuitive to me.