BLI: add safe_divide, safe_modf and safe_logf

Those are defined exactly as their corresponding functions in Cycles.

2 files changed, 22 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_base.h b/source/blender/blenlib/BLI_math_base.h
index 49aa9f3b465..93cd902c27f 100644
--- a/source/blender/blenlib/BLI_math_base.h
+++ b/source/blender/blenlib/BLI_math_base.h
@@ -218,6 +218,10 @@ MINLINE unsigned short round_db_to_ushort_clamp(double a);
 MINLINE int round_db_to_int_clamp(double a);
 MINLINE unsigned int round_db_to_uint_clamp(double a);
 
+MINLINE float safe_divide(float a, float b);
+MINLINE float safe_modf(float a, float b);
+MINLINE float safe_logf(float a, float base);
+
 int pow_i(int base, int exp);
 double double_round(double x, int ndigits);
 
diff --git a/source/blender/blenlib/intern/math_base_inline.c b/source/blender/blenlib/intern/math_base_inline.c
index 26dc4d35c80..bd4eb12a72c 100644
--- a/source/blender/blenlib/intern/math_base_inline.c
+++ b/source/blender/blenlib/intern/math_base_inline.c
@@ -348,6 +348,24 @@ MINLINE signed char round_db_to_char_clamp(double a){
 #undef _round_clamp_fl_impl
 #undef _round_clamp_db_impl
 
+MINLINE float safe_divide(float a, float b)
+{
+  return (b != 0.0f) ? a / b : 0.0f;
+}
+
+MINLINE float safe_modf(float a, float b)
+{
+  return (b != 0.0f) ? fmodf(a, b) : 0.0f;
+}
+
+MINLINE float safe_logf(float a, float base)
+{
+  if (UNLIKELY(a <= 0.0f || base <= 0.0f)) {
+    return 0.0f;
+  }
+  return safe_divide(logf(a), logf(base));
+}
+
 /* integer division that rounds 0.5 up, particularly useful for color blending
  * with integers, to avoid gradual darkening when rounding down */
 MINLINE int divide_round_i(int a, int b)