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add boot-up vram randomization for homebrew games, to more accurately mimic being loaded from a flash card that leaves behind some junk

This commit is contained in:
zeromus 2011-04-14 21:05:19 +00:00
parent 2c8a4603ab
commit c44819873a
1 changed files with 18 additions and 1 deletions
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19
desmume/src/NDSSystem.cpp
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@ -493,11 +493,28 @@ int NDS_LoadROM(const char *filename, const char *logicalFilename)
INFO("ROM game code: %c%c%c%c\n\n", gameInfo.header.gameCode[0], gameInfo.header.gameCode[1], gameInfo.header.gameCode[2], gameInfo.header.gameCode[3]);
//for homebrew, try auto-patching DLDI. should be benign if there is no DLDI or if it fails
if(!memcmp(gameInfo.header.gameCode,"####",4))
bool isHomebrew = !memcmp(gameInfo.header.gameCode,"####",4);
if(isHomebrew)
DLDI::tryPatch((void*)gameInfo.romdata, gameInfo.romsize);
NDS_Reset();
//put garbage in vram for homebrew games, to help mimic the situation where libnds does not clear out junk
//which the card's launcher may or may not have left behind
if(isHomebrew)
{
u32 w=100000,x=99,y=117,z=19382173;
for(int i=0;i<sizeof(MMU.ARM9_LCD);i++)
{
u32 t= (x^(x<<11));
x=y;
y=z;
z=w;
t = (w= (w^(w>>19))^(t^(t>>8)));
MMU.ARM9_LCD[i] = t;
}
}
memset(buf, 0, MAX_PATH);
path.getpathnoext(path.BATTERY, buf);