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Added SDL_rand_float and SDL_rand_n to API

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This commit is contained in:
John Kaniarz
2024-06-16 22:10:54 -04:00
committed by Sam Lantinga
parent f4ee59a1a2
commit 83d21e20df
4 changed files with 47 additions and 9 deletions
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11
src/stdlib/SDL_random.c
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@@ -42,20 +42,13 @@ Uint32 SDL_rand(void)
return SDL_rand_r(&SDL_rand_state);
}
/*
* Return a number between [0, n)
* Fast but slightly biased. Don't run your casino with this.
*/
Sint32 SDL_rand_n(Sint32 n)
Uint32 SDL_rand_n(Uint32 n)
{
// On 32-bit arch, the compiler will optimize to a single 32-bit multiply
Uint64 val = (Uint64)SDL_rand() * n;
return (Sint32)(val >> 32);
return (Uint32)(val >> 32);
}
/*
* Random float in range [0,1)
*/
float SDL_rand_float(void)
{
return (SDL_rand() >> (32-24)) * 0x1p-24f;