Add force sgx mode for games like darius about beetle-pce-libretro

[bslenul]

All the games listed here force SGX mode:

beetle-pce-libretro/mednafen/pce/pce.cpp

Lines 255 to 268 in 7f03756

	static const struct
	{
	uint32 crc;
	const char* name;
	} sgx_table[] =
	{
	{ 0xbebfe042, "Darius Plus", },
	{ 0x4c2126b0, "Aldynes" },
	{ 0x8c4588e2, "1941 - Counter Attack" },
	{ 0x1f041166, "Madouou Granzort" },
	{ 0xb486a8ed, "Daimakaimura" },
	{ 0x3b13af61, "Battle Ace" },
	{ 0, "" }
	};

so Darius Plus already runs in SGX mode with this core.

Very obvious on the 1st boss, look at all that sprite flickering if I manually remove the game from that list:

forcesgx_off.mp4

vs. how it looks like in SGX mode:

forcesgx_on.mp4

I added Darius Alpha in the list but couldn't see any difference, after some google searches it looks like it's not actually enhanced despite the logo on the box: https://forums.atariage.com/topic/237235-the-official-turbografx-16-thread/page/76/

[007mesen]

Ok. Is there any reason to keep the force sgx core option hidden? It used to be there then some one removed it. What advantage is there to having removed the option to force sgx?

[bslenul]

AFAICT it was never an option in the Beetle PCE core, however there is a "Force SuperGrafx Emulation" core option in the Beetle SuperGrafx core.