Currently even the OpenGL 1.3 device assumes non power of 2 texture support and 2048 x 2048 size limits. The XL Engine should work even with older GPUs that cannot handle non power of 2 textures and/or more severe texture size limits.
Note, however, that GPUs will be required to support at least 512 x 512 textures and that game resolutions may be limited by GPU texture size.
Currently even the OpenGL 1.3 device assumes non power of 2 texture support and 2048 x 2048 size limits. The XL Engine should work even with older GPUs that cannot handle non power of 2 textures and/or more severe texture size limits.
Note, however, that GPUs will be required to support at least 512 x 512 textures and that game resolutions may be limited by GPU texture size.