brentdc-nz/pcsx-reloadedx

A Xbox port of PCSX-Reloaded with hardware rendered graphics. Stable repo i.e. only thoroughly tested optimizations are merged(testing still in progress).

PCSX-ReloadedX - Beta v1.0

This is a port of PCSX-Reloaded to Xbox using hardware rendered graphics.

Main remaining tasks:

• Explore speed optimizations further.
• Get built in cheats working.
• Get save states working.
• Make a intermediate menu while running a rom.

Knowen bugs:

• Fix rumble, it currently works but has a bug that causes it to say on sometimes.

Compiled build available here:

https://www.emuxtras.net/forum/viewtopic.php?f=189&t=6561

pcsx-reloadedx's Issues

Lightrec

I'd suggest experimenting with my dynarec: https://github.com/pcercuei/lightrec

It's likely to be much faster than the dynarec you have in pcsx-reloadedX, from what I can see from the code, especially if you can use the MMU. It's been used on the GameCube for instance, and some 3D games like Spyro 2 average ~40fps with software rendering.

I'd do it myself but I have zero experience with Xbox development, and I'm running Linux exclusively.

You guys would get a faster dynarec, and I would get good testing on a x86 32-bit platform - which is interesting as it has a very limited number of registers to play with.

Xbox supports immediate mode rendering

https://github.com/marty28/PCSX-ReloadedX/blob/08d568c3e1be175bd52fbc736f94553ca0b41f4b/xbox/fakeglx/fakeglx09.c#L980-L988

This is not true for Xbox Direct3D. The Xbox GPU (NV2A) supports immediate mode rendering.
Microsoft added hardware extensions which should be available as:

• D3DDevice::Begin
• D3DDevice::SetVertexData4f and friends
• D3DDevice::End

The mapping is the one that you'd expect from the nvidia OpenGL implementation; vertex attribute 0 submits the vertex (equivalent to glVertex4f).

The data would be inlined into the pushbuffers. You can avoid the call overhead, by constructing a custom pushbuffer from scratch to get zero-copy for extra performance. You can then use D3DDevice::RunPushBuffer or something to submit it.
Wether this is faster: I don't know. It certainly depends on what kind of data you submit.

Also check @xqemu code or nxdk source-code for more information. @XboxDev community in general will have knowledge about this (although we might not always know what's best for performance yet).