*
* The exact semantics of depth varies according to the texture target:
* - For GL_TEXTURE_CUBE_MAP, depth is 6.
- * - For GL_TEXTURE_2D_ARRAY, depth is the number of array slices. It is
- * identical for all miplevels in the texture.
* - For GL_TEXTURE_3D, it is the texture's depth at this miplevel. Its
* value, like width and height, varies with miplevel.
* - For other texture types, depth is 1.