[Openexr-devel] OT: examples on doing simple 1D LUTs with Cg?

[Paul Miller]

Hey guys. I have code to read in a text file of float values (256 right 
now) and stuff them into a 256x1 RGB texture, with component values in 
the range of 0-255.

I'm using the Cg Toolkit to specify the value of my sampler1D uniform to 
the texture ID of the LUT texture.

Now I'm a bit hazy on how to access the texture for each channel in my 
display shader. But all I get is black output.

Either I'm setting up the sampler uniform improperly, or accessing the 
1D texels wrong in the shader.

Does anyone have some pointers to the proper way to do simple 1D LUTs 
using Cg? I'm not even sure of the correct way to make sure the LUT 
texture is sampled using bilinear interpolation.

Thanks for any tips!

--
Paul Miller | address@hidden | www.fxtech.com | Got Tivo?