border color of rendertexture in postprocess of HDRP

Hi,

I am making a custom postprocess in HDRP. I am confused when I sample a texture with a uv less than 0 or greater than 1, I will get a black color.
I 'd like to know what's the wrapmode of rendertexture in the RTHandle. And Why I got a black color.

Code (CSharp):

1. // I add a offset value to uv.x to simulate a glitch effect. It makes the uv.x at the border of rendertexture maybe less than 0 or greater than 1
2. float4 c = LOAD_TEXTURE2D_X(_InputTexture, float2(uv.x + noise * 0.05, uv.y) * _ScreenSize.xy)

Thanks.

 

hello，how did u due with it？