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Compute Shader - Reading and writing to the same RGBA16 texture?

Started by bjarnia Apr 1, 2013 at 10:55 PM 3 replies 12.1k views

Original Post

Apr 1, 2013 at 10:55 PM

I'm trying to implement post processing in compute shaders and I've been having difficulty figuring out how I can read and write to the same UAV bound texture resource whose format is DXGI_FORMAT_R16G16B16A16_FLOAT. An RGBA8 format would not be an issue as far as I can tell, nor would it be an issue if I was reading from a different intput buffer.. but those are unfortunately 2 constraints that I have :)

I can't simply type it as RWTexture2D, this forbids me from reading from it. I can do RWTexture2D, but I have not found a way of retrieving and writing to all 4 float values of a single pixel.

I figured I'd have to use byte address buffers, but found this note on MSDN; "The UAV format bound to this resource needs to be created with the DXGI_FORMAT_R32_TYPELESS format.", but I need to operate on 64 bit granularity (so I only write to each "pixel" once.

Are there any good ways to do this?

MJP

Apr 2, 2013 at 12:04 AM

Yeah it has to be an R32 format if you want to read and write to it in the same shader. The only workaround is to use a StructuredBuffer instead of a Texture2D, since you can read and write to regardless of the struct size.

Bummel

Mar 3, 2015 at 5:59 PM

Yeah it has to be an R32 format if you want to read and write to it in the same shader.

I'm searching msdn but can't find any source I could cite in my thesis that explicitly states this. Can anyone help me? Thx.

MJP

Mar 4, 2015 at 6:23 AM

Here you go. (scroll down to the section entitled "UAV typed load")

Bummel

Mar 4, 2015 at 10:11 AM

Great! Thank you very much!

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