A texel represents the smallest unit of a texture that can be read from or written to by the GPU. A texel is composed of 1 to 4 components. Specifically, a texel may be any one of the available texture formats represented in the SurfaceFormat enumeration.

A Texture2D resource contains a 2D grid of texels. Each texel is addressable by a u, v vector. Since it is a texture resource, it may contain mipmap levels. Figure 1 shows a fully populated 2D texture resource.

Figure 1.  Texture2D Resource Architecture

This texture resource contains a single 3×5 texture with three mipmap levels.

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