I am mapping two textures to a polygon and blending them together. One is RGB and the other is ALPHA. When I choose the dimensions of the texture to the higher power of two I get odd shadows. When I choose the lower power of two it looks fine.
The shadow appears as if the alpha value on the opposite edge of the texture gets copied to the other side. I am using GL_CLAMP_TO_EDGE, but it doens't help.