This could cause random lockups when loading a savegame for a game not maintaining the feature. The entire engine state really needs to be handled globally instead of repeating this core 5 times...
With the new backend there will always be just one page, never more, so the RS_PERMS case will never be entered.
In addition, since the software renderer has already been nonfunctional due to lacking support from the 2D drawer, its 2D components have also been removed. Its main remaining purpose, drawing camera textures, remains unaffected by this.
The data organization here is a mess, no wonder that this game could only save at the beginning of a level.
Fortunately it's all static so no allocations and pointers to track.
