Question

Just like topic says. Can one access CUDA texture using integer coordinates?
ex.

tex2D(myTex, 1, 1);

I’d like to store float values in texture, and use it as my framebuffer.
I will pass it to OpenGL than to render on a screen.

Is this addressing possible? I don’t want to interpolate between pixels. I want value from exactly specified point.

Answer 1

Note: there isn’t really interpolation going on when you use the 0.5 offset notation for multi-dimensional textures (the actual pixel values start at (0.5, 0.5)). If you’re really worried, set round-to-nearest point rather than default of bilinear.

If you use 1D textures instead (when the underlying data is 2D), you may lose performance due to lack of data locality in the other dimension.