"Interpolant" precision on a texture read with linear interpolation?

[n.b.agostini]

I read in 2 places that the index during a texture read using linear interpolation is quantized to 256 values.

• texture interpolation - #7 by Simon_Green
• http://www.orangeowlsolutions.com/archives/1189 last question

Is it the case for the latest Cuda Toolkit (11) and latest hardware (Pascal, Volta, Turing, Ampere)?

I could not find this information on the Cuda Toolkit Documentation.

[njuffa]

linear interpolation is quantized to 256 values.

That is correct and applies to all GPUs supported by CUDA. Documented in appendix H of the CUDA Programming Guide:

https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#linear-filtering