diff options
Diffstat (limited to 'intern/cycles/kernel/kernel_random.h')
| -rw-r--r-- | intern/cycles/kernel/kernel_random.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/intern/cycles/kernel/kernel_random.h b/intern/cycles/kernel/kernel_random.h index 9083b7cbfd7..e2eb8d5db83 100644 --- a/intern/cycles/kernel/kernel_random.h +++ b/intern/cycles/kernel/kernel_random.h @@ -200,5 +200,19 @@ __device void path_rng_end(KernelGlobals *kg, __global uint *rng_state, RNG rng) #endif +__device float lcg_step(uint *rng) +{ + /* implicit mod 2^32 */ + *rng = (1103515245*(*rng) + 12345); + return (float)*rng * (1.0f/(float)0xFFFFFFFF); +} + +__device uint lcg_init(float seed) +{ + uint rng = __float_as_int(seed); + lcg_step(&rng); + return rng; +} + CCL_NAMESPACE_END |