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Replace the existing PRNG (Xorshift31) with (minimal) PCG (XSH-RR variant with 32-bit output, 64-bit state).

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PCG is better than many alternatives by many metrics (see www.pcg-random.org) including statistical quality with good speed.
This commit is contained in:
Ferenc Arn
2017-01-14 23:34:51 -06:00
parent 5dde810aa5
commit 4c9004671a
7 changed files with 54 additions and 25 deletions
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4
modules/gdscript/gd_functions.cpp
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@@ -351,14 +351,14 @@ void GDFunctions::call(Function p_func,const Variant **p_args,int p_arg_count,Va
case MATH_SEED: {
VALIDATE_ARG_COUNT(1);
VALIDATE_ARG_NUM(0);
uint32_t seed=*p_args[0];
uint64_t seed=*p_args[0];
Math::seed(seed);
r_ret=Variant();
} break;
case MATH_RANDSEED: {
VALIDATE_ARG_COUNT(1);
VALIDATE_ARG_NUM(0);
uint32_t seed=*p_args[0];
uint64_t seed=*p_args[0];
int ret = Math::rand_from_seed(&seed);
Array reta;
reta.push_back(ret);