Special Cases
Textures aren't infinite, in general, and sometimes one ends up with a pixel coordinate that lies outside the grid of texel coordinates. There are a few ways to handle this:
- Wrap the texture, so that the last texel in a row also comes right before the first, and the last texel in a column also comes right above the first. This works best when the texture is being tiled.
- Make the area outside the texture all one color. This may be of use for a texture designed to be laid over a solid background or to be transparent.
- Repeat the edge texels out to infinity. This works best if the texture is not designed to be repeated.
Read more about this topic: Bilinear Filtering
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