I use the D-pad on the 3DS, rendering the L and ZL buttons basically
unusable. By swapping ZL and ZR, I can cycle through the weapons both
ways with only my right hand.
This commit customises the software renderer specifically for the
3DS, taking into account its rotated framebuffer and BGR format.
With this, the game appears to run full-speed on Old3DSs. Of course,
the level transition effect still makes the console chug, but that
thing was always a bit of a bottleneck.
On the 3DS, I want the data files to go in the read-only ROMFS, while
save data goes on the SD card. This is impossible with the current
system, so I'm changing it.
The other backends will need updating to support this.
Was a lot easier than I expected. The software renderer is such a
godsend for quick-and-dirty ports.
Oddly enough, even on an old3DS, this actually almost runs at full
speed (hits around 40FPS in Mimiga Village).
There's a lot of work left to do before this is actually useable:
* There's no audio
* You can't save
* A proper hardware-accelerated renderer is needed
