What happens when I have a uint32 (R32) texture and I sample/fetch from it in a shader?

Question

Note: I distinguish sample from fetch in the title, since in my tests this behavior seems to differ between the two.

Possible answers:

• The [0..2^32] range is scaled down to [0..1] (I think OpenGL works this way)
• The uint32s are casted to float32s (which, incidentally, means that some precision is lost).
• Other?

Answer 1

I made a test with renderdoc.

When using fetch, and the texture is defined with Texture2D<uint>, the fetch functions simply return a uint instead of a float4.