1D Texture

I’m doing a kind of cartoon rendering. I use a 1D texture to store shade values. It looks working fine unless the single texture coordinate is 1.0; then every thing is messy.
Shade values are random and changing as I move or resize the window. I’m rendering trinagles as smooth shaded and 1D textured.
I tried to pass the 1.0 texcoord in a similar program, not mine, and I got the same distrubing results.
Is it a driver problem? or is it a normal thing?

Maybe yuo have the wrap mode set to GL_REPEAT, so when sampling the texture coordinate 1.0, you get a sample from the other edge of the texture aswell (due to linear filterting). Try change the wrap mode to GL_CLAMP.


Bob’s right. The texture wrapping may be causing this.
Though, I’d rather recommend GL_CLAMP_TO_EDGE instead of GL_CLAMP.
Almost all todays cards (if not all) support GL_CLAMP_TO_EDGE.