An prototype of editor mode

The editor mode is being developed. A screen capture is left here: The code has not been uploaded yet.

Four textures are rendered. HDR and the shadows are removed to save some time. Update() will be removed as well. But it is kind of slow. I just wonder if it is the problem of the StretchRect or because of the video card capability of my laptop. Tomorrow I would try to use one texture instead of four textures. If it is still slow, I think it would be the problem of "software vertex processing".