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Fix T48139: Checker texture strange behavior in cycles

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Seems particular CUDA implementations has some precision issues,
which made integer coordinate (which was expected to always be
positive) to go negative.
This commit is contained in:
Sergey Sharybin
2016-04-15 15:29:12 +02:00
parent 177d051126
commit 3165e8740b
2 changed files with 8 additions and 3 deletions
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6
intern/cycles/kernel/svm/svm_checker.h
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@@ -25,9 +25,9 @@ ccl_device_noinline float svm_checker(float3 p)
p.y = (p.y + 0.000001f)*0.999999f;
p.z = (p.z + 0.000001f)*0.999999f;
int xi = float_to_int(fabsf(floorf(p.x)));
int yi = float_to_int(fabsf(floorf(p.y)));
int zi = float_to_int(fabsf(floorf(p.z)));
int xi = abs(float_to_int(floorf(p.x)));
int yi = abs(float_to_int(floorf(p.y)));
int zi = abs(float_to_int(floorf(p.z)));
return ((xi % 2 == yi % 2) == (zi % 2))? 1.0f: 0.0f;
}