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author | Sergey Sharybin <sergey.vfx@gmail.com> | 2016-11-26 19:30:02 +0300 |
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committer | Sergey Sharybin <sergey.vfx@gmail.com> | 2016-12-01 16:19:15 +0300 |
commit | 9d50175b6cc5860926f0974fafd9e8e7868eb805 (patch) | |
tree | cad6adc656bb48c9083a0759cde31d585bff348d /intern/cycles/kernel/kernel_jitter.h | |
parent | 87cd56b012494e20be06b63f85b798fa043c3194 (diff) |
Cycles: Fix correlation issues in certain cases
There were two cases where correlation issues were obvious:
- File from T38710 was giving issues in 2.78a again
- File from T50116 was having totally different shadow between
sample 1 and sample 32.
Use some more simplified version of CMJ hash which seems to give
nice randomized value which solves the correlation.
This commit will break all unit test files, but it's a bug fix
so perhaps OK to commit this.
This also fixes T41143: Sobol gives nonuniform noise
Proper science paper about hash function is coming.
Reviewers: brecht
Reviewed By: brecht
Subscribers: lukasstockner97
Differential Revision: https://developer.blender.org/D2385
Diffstat (limited to 'intern/cycles/kernel/kernel_jitter.h')
-rw-r--r-- | intern/cycles/kernel/kernel_jitter.h | 9 |
1 files changed, 9 insertions, 0 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); |