Debugging USF (Unreal Shader Files)

[Drayan]

@DanielW;82571

I haven’t tried source in Nsight for a while, but some things you can try:

• Remove the call to D3DStripShader in D3D11ShaderCompiler.cpp. You have to recompile ShaderCompileWorker Win64 Development to propagate the change. And then add a space or something to common.usf to force shaders to recompile (if you are working on a global shader just edit it a bit).
• In UE4 we compile the shaders in a different app (ShaderCompileWorker) which allows making use of all your cores. However tools like NSight don’t know about this other app and they only hook the compile calls in the main executable. If you open BaseEngine.ini and set bAllowCompilingThroughWorkers=False, any future shaders will be compiled from the main executable. Of course, this will make compiling super slow.

Thanks,

That’s exactly what I’m doing, but I didn’t add a space in common.usf. This could explain why I only got my Vertex Factory source in nsight and not the others ?
And I can try for removing the compiling with worker. (Already did too, actually). But, as you said, it’s very slow. And (I guess) as I’m working on a VF, every times I make a change to my VF it need to recompile all the shaders (around 4000 shaders…).

With the worker, it takes something like 10 minutes on my computer. So without, it will be long…

In annex, sometimes my VF compile in less than a seconds (it just recompile the VF ?), sometimes it recompile the whole… I don’t really know why.