Improving generated random numbers

[240-185]

Hi,

I'm coding for now a homebrew which involves lots of random events, so I have to generate a lot of pseudo-random numbers. After having read tutorials from some places over the web, the code is:

Code:

int main(void)
{

SceKernelUtilsMt19937Context ctx;
sceKernelUtilsMt19937Init(&ctx, time(NULL));
char UnsecureBuffer[25];

u32 rand_val = (sceKernelUtilsMt19937UInt(&ctx))%201;
sprintf(UnsecureBuffer, "Your current IQ is: %d\n", (int)rand_val);

printf(UnsecureBuffer);

return 0;

}

This works on the real hardware, not in PPSSPP, where the generated number is always 0.

[[Unknown]]

Ah, we haven't implemented those functions yet. Presumably it's a Mersenne Twister MT19937 implementation. Pull request welcome.

I think the VFPU also provides random numbers (using rnds and e.g. rndi), but I don't know their quality.

-[Unknown]

[Henrik]

Just for the record, I went ahead and implemented this. Haven't tested it yet though, please report if it works.

I don't know what generator the VFPU uses, but its state is "just" 8 32-bit registers IIRC so it can't be MT.