diff options
Diffstat (limited to 'intern')
| -rw-r--r-- | intern/cycles/kernel/kernel_jitter.h | 9 | ||||
| -rw-r--r-- | intern/cycles/kernel/kernel_random.h | 12 | ||||
| -rw-r--r-- | intern/cycles/kernel/kernel_volume.h | 9 |
3 files changed, 16 insertions, 14 deletions
diff --git a/intern/cycles/kernel/kernel_jitter.h b/intern/cycles/kernel/kernel_jitter.h index aec7bc33acd..67546131746 100644 --- a/intern/cycles/kernel/kernel_jitter.h +++ b/intern/cycles/kernel/kernel_jitter.h @@ -149,6 +149,15 @@ ccl_device_inline uint cmj_hash(uint i, uint p) return i; } +ccl_device_inline uint cmj_hash_simple(uint i, uint p) +{ + i = (i ^ 61) ^ p; + i += i << 3; + i ^= i >> 4; + i *= 0x27d4eb2d; + return i; +} + ccl_device_inline float cmj_randfloat(uint i, uint p) { return cmj_hash(i, p) * (1.0f / 4294967808.0f); diff --git a/intern/cycles/kernel/kernel_random.h b/intern/cycles/kernel/kernel_random.h index 2b767da5041..e773753396f 100644 --- a/intern/cycles/kernel/kernel_random.h +++ b/intern/cycles/kernel/kernel_random.h @@ -120,13 +120,11 @@ ccl_device_forceinline float path_rng_1D(KernelGlobals *kg, ccl_addr_space RNG * /* Cranly-Patterson rotation using rng seed */ float shift; - /* using the same *rng value to offset seems to give correlation issues, - * we could hash it with the dimension but this has a performance impact, - * we need to find a solution for this */ - if(dimension & 1) - shift = (*rng >> 16) * (1.0f/(float)0xFFFF); - else - shift = (*rng & 0xFFFF) * (1.0f/(float)0xFFFF); + /* Hash rng with dimension to solve correlation issues. + * See T38710, T50116. + */ + RNG tmp_rng = cmj_hash_simple(dimension, *rng); + shift = tmp_rng * (1.0f/(float)0xFFFFFFFF); return r + shift - floorf(r + shift); #endif diff --git a/intern/cycles/kernel/kernel_volume.h b/intern/cycles/kernel/kernel_volume.h index dd7b0d9812d..a07ce6be077 100644 --- a/intern/cycles/kernel/kernel_volume.h +++ b/intern/cycles/kernel/kernel_volume.h @@ -582,17 +582,12 @@ ccl_device VolumeIntegrateResult kernel_volume_integrate_heterogeneous_distance( ccl_device_noinline VolumeIntegrateResult kernel_volume_integrate(KernelGlobals *kg, PathState *state, ShaderData *sd, Ray *ray, PathRadiance *L, float3 *throughput, RNG *rng, bool heterogeneous) { - /* workaround to fix correlation bug in T38710, can find better solution - * in random number generator later, for now this is done here to not impact - * performance of rendering without volumes */ - RNG tmp_rng = cmj_hash(*rng, state->rng_offset); - shader_setup_from_volume(kg, sd, ray); if(heterogeneous) - return kernel_volume_integrate_heterogeneous_distance(kg, state, ray, sd, L, throughput, &tmp_rng); + return kernel_volume_integrate_heterogeneous_distance(kg, state, ray, sd, L, throughput, rng); else - return kernel_volume_integrate_homogeneous(kg, state, ray, sd, L, throughput, &tmp_rng, true); + return kernel_volume_integrate_homogeneous(kg, state, ray, sd, L, throughput, rng, true); } /* Decoupled Volume Sampling |