tiling textures: you can "wrap" the coordinate in the shader prior making the look up. You only have to preserve original texture coordinate gradients so that the mipmaps are not screwed. Basically mipmaps are computed from the difference of texture coordinates with quad (2x2 pixel threads). When you do the coordinate…
Simon, all the screenshots you present come from the emulator right? So unless someone looks up what the original hardware was capable of, we don't know 100%. As you say it makes no sense if the depth-buffer was lower res. Maybe the emulator decided to visualize the depth-buffer in lower-res to make it pop out more? Maybe…