Transposed Texture -> degraded accuracy?

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi all,

When I transpose one of my 2D textures (originally: couple thousand X 3, four-channel), my results suddenly become two orders of magnitude less accurate (1e-7 to 1e-5). Has anybody seen something like this?

I’m pretty puzzled.

Andreas

2

Are you using cudaFilterModeLinear? I’m wondering if some weird rounding error in the indexing is causing you to access the texture slightly offset from the point you want.

3

Nope, I’m using point rounding filtering.

4

Huh, well, I’m out of ideas then. Hopefully someone else has seen this…

5

Whoops. I must’ve been imagining this–I can’t reproduce it any more. Weird.

Sorry for the noise.

Andreas