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Diffstat (limited to 'intern/cycles/kernel/bvh/util.h')
| -rw-r--r-- | intern/cycles/kernel/bvh/util.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/intern/cycles/kernel/bvh/util.h b/intern/cycles/kernel/bvh/util.h index 572e023db25..1795ae4c790 100644 --- a/intern/cycles/kernel/bvh/util.h +++ b/intern/cycles/kernel/bvh/util.h @@ -5,6 +5,19 @@ CCL_NAMESPACE_BEGIN +/* Offset intersection distance by the smallest possible amount, to skip + * intersections at this distance. This works in cases where the ray start + * position is unchanged and only tmin is updated, since for self + * intersection we'll be comparing against the exact same distances. */ +ccl_device_forceinline float intersection_t_offset(const float t) +{ + /* This is a simplified version of nextafterf(t, FLT_MAX), only dealing with + * non-negative and finite t. */ + kernel_assert(t >= 0.0f && isfinite_safe(t)); + const uint32_t bits = (t == 0.0f) ? 1 : __float_as_uint(t) + 1; + return __uint_as_float(bits); +} + #if defined(__KERNEL_CPU__) ccl_device int intersections_compare(const void *a, const void *b) { |