BLI: add safe_powf function

The same function is also used by cycles.

2 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_base.h b/source/blender/blenlib/BLI_math_base.h
index c456ab0ecef..49aa9f3b465 100644
--- a/source/blender/blenlib/BLI_math_base.h
+++ b/source/blender/blenlib/BLI_math_base.h
@@ -103,6 +103,7 @@ MINLINE float pow2f(float x);
 MINLINE float pow3f(float x);
 MINLINE float pow4f(float x);
 MINLINE float pow7f(float x);
+MINLINE float safe_powf(float base, float exponent);
 
 MINLINE float sqrt3f(float f);
 MINLINE double sqrt3d(double d);
diff --git a/source/blender/blenlib/intern/math_base_inline.c b/source/blender/blenlib/intern/math_base_inline.c
index 1b388dcf11f..26dc4d35c80 100644
--- a/source/blender/blenlib/intern/math_base_inline.c
+++ b/source/blender/blenlib/intern/math_base_inline.c
@@ -70,6 +70,13 @@ MINLINE float pow7f(float x)
 {
   return pow2f(pow3f(x)) * x;
 }
+MINLINE float safe_powf(float base, float exponent)
+{
+  if (UNLIKELY(base < 0.0f && exponent != (int)exponent)) {
+    return 0.0f;
+  }
+  return powf(base, exponent);
+}
 
 MINLINE float sqrt3f(float f)
 {