* There is a substantial speed gain from HLEing the ARM7. So far, I've implemented enough of the utility services to get some games to boot, and observe a few things: So I've been experimenting with this in a private repo. Most of these services are fairly simple, with sound and wifi being by far the most complex ones. The services serve to provide access to the ARM7-side hardware: sound, wifi, touchscreen controller, PMIC, firmware memory, etc. When the game boots, there is a IPCSYNC handshake, then the ARM7 exposes a bunch of services that are accessed via the IPC FIFO. The ARM9 communicates with the ARM7 via the IPC hardware (IPCSYNC and the IPC FIFO), and some shared memory areas. It also means that the ARM7 is limited to taking care of utility tasks, while all the game logic is running on the ARM9. This means that, in theory, all commercial games out there will have one of the few possible ARM7 binary versions. It may seem feasible if you consider that Nintendo never allowed game developers to write their own ARM7 binaries. What I've been experimenting with melonHLE goes further: HLEing the ARM7. BIOS calls aren't critical enough that HLEing them might boost performance significantly. The main advantage to this is that the emulator doesn't require a proper BIOS dump to run games, but there is no other real benefit from this. Some emulators, like DeSmuME, are able to HLE the BIOS calls, basically replicating them inside the emulator. DS games are mostly self-contained and run on the bare metal, relying on the small BIOSes for basic functions like interrupt waits, decompression, etc. While my situation is being sorted out, I will make a post about an idea I had a while ago: attempting HLE for DS emulation.Īll the existing DS emulators, as far as I'm aware, are essentially LLE.
#Retroarch switch nighly full#
Full 3D games are more demanding, so this is a worthy optimization target.Ĩ comments (last by Melondslover) | Post a comment For example, Generic is trying to optimize melonDS for the Switch, and more particularly trying to optimize the whole 3D graphics pipeline. This joins the general idea of optimizing melonDS for lower-end platforms. Now, you may ask, how does any of this relate to the netplay saga? In the end, it might be integrated into melonDS as an option, though it needs more work and testing. Regardless, melonHLE may prove a viable option for lower-end platforms. A much bigger kMaxIterationCycles value increases performance to some extent and has no downsides. The current value of 64 is chosen to keep the ARM9 and ARM7 somewhat in sync, but obviously, in melonHLE we don't need to keep the ARM7 in sync. There are some simple ways to make melonHLE faster, one of which is increasing the maximum CPU time slice (kMaxIterationCycles). However, keep in mind that this is largely a quick and dirty experiment. MelonHLE shows to be faster, but it's not mindblowing either. Numbers are an average measure of frames per second. The tests were done on my laptop Crepe (Core i7-5500U, 2.4GHz). I've had some fun reverse-engineering the sound engines and implementing them, with decent results. The compatibility rate seemed good, even though some games don't run because some auxiliary services aren't completely implemented. I continued my work on melonHLE, taking it to a point where it may be something serious. So first of all, I'm done with the mold problem and its consequences, meaning that my apartment finally looks like an actual apartment and I can exhale a big sigh of relief. If you're running into trouble: Howto/FAQ (WIP) Wifi: local multiplayer, online connectivity.Various display position/sizing/rotation modes.Nearly complete core (CPU, video, audio.While it is still a work in progress, it has a pretty solid set of features: MelonDS aims at providing fast and accurate Nintendo DS emulation.
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