![]() This means that two of the layers have to be merged to use the hardware acceleration which leads to all sorts of glitches (characters appearing above HUD items, HUD being completely invisible, characters appearing above foreground objects, etc). The biggest problem is that the GBA and DS only support 3 hardware layers, while the SNES has 4. The DS (and GBA) SNES emulators ARE built from the ground up for the hardware and thus can take full advantage of these hardware tricks to High-Level emulate (HLE) the system. The DS is (at it's heart) still a tile based system and has a lot of 2D acceleration tricks including support for hardware layers. This is very CPU intensive and thus requires much beefier specs. When emulating the SNES the PSP has to do the same thing that PC emulators do, that is emulate everything via software. It's only possible because of how similar the SNES/GBA/DS are. Remarkably so given the fact that the DS is a lot weaker than the PSP.
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