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Fix T48139: Checker texture strange behavior in cycles 

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
Notes: blender-bot 2023-02-14 07:59:34 +01:00 
Referenced by issue #48139, checker texture strange behavior in cycles
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;
}

5
intern/cycles/util/util_math.h
View File

@ -97,6 +97,11 @@ ccl_device_inline float fminf(float a, float b)
#ifndef __KERNEL_GPU__
ccl_device_inline int abs(int x)
{
return (x > 0)? x: -x;
}
ccl_device_inline int max(int a, int b)
{
return (a > b)? a: b;