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Fix #141388: Cycles: CPU/GPU difference in pow function with 0 base

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If the base is 0 and the exponent is non-zero, return 0 for both CPU and GPU.

Pull Request: https://projects.blender.org/blender/blender/pulls/142678
This commit is contained in:
Weizhen Huang
2025-07-21 14:45:30 +02:00
committed by Weizhen Huang
parent 40b2cd92ee
commit 9404db8c7c
1 changed files with 7 additions and 5 deletions
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12
intern/cycles/util/math_base.h
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@@ -547,10 +547,14 @@ ccl_device float safe_acosf(const float a)
ccl_device float compatible_powf(const float x, const float y)
{
#ifdef __KERNEL_GPU__
if (y == 0.0f) /* x^0 -> 1, including 0^0 */
if (y == 0.0f) {
/* x^0 -> 1, including 0^0. */
return 1.0f;
}
if (x == 0.0f) {
return 0.0f;
}
#ifdef __KERNEL_GPU__
/* GPU pow doesn't accept negative x, do manual checks here */
if (x < 0.0f) {
if (fmodf(-y, 2.0f) == 0.0f) {
@@ -560,8 +564,6 @@ ccl_device float compatible_powf(const float x, const float y)
return -powf(-x, y);
}
}
else if (x == 0.0f)
return 0.0f;
#endif
return powf(x, y);
}