What is the RHI thread?What is the difference between RHI thread and rendering thread

[anonymous_user_f2b8b290]

Thank you for reply,but how to compile the source code make the RHIThread actually work.is there any preprocessor macro defined to enable the feature?

It is used by default, in fact you have to launch with ‘-norhithread’ to disable it.

Will the RHI threading be more useful in DX12? I notice that DX12 mentions some optimisations provide a ten-fold increase in the number of polygons that can be handled - would that be related to fixing that botched threading?

D3D12 will allow parallel command list building, which D3D11 did not (efficiently). Ideally the engine will do less and less work on the RHI thread and more work in command list building tasks. This can enable massive parallelization of rendering. However, a huge amount of work has to be done to refactor the renderer to get those gains.

In summary, the RHI thread is a temporary measure to get graphics API overhead off of the rendering thread, until graphics API’s come around (like Vulkan and D3D12) that can properly support parallel command list creation.