BLI_math: Fix several division-by-zero cases.

Those were caused by various tools used on degenerate geometry, see
T79775.

Note that fixes are as low-level as possible, to ensure they cover as
much as possible of unreported issues too.

We still probably have many more of those hidden in BLI_math though.

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/blenlib/intern/math_vector_inline.c b/source/blender/blenlib/intern/math_vector_inline.c
index ead354c2d87..e0df9665a7e 100644
--- a/source/blender/blenlib/intern/math_vector_inline.c
+++ b/source/blender/blenlib/intern/math_vector_inline.c
@@ -1282,6 +1282,21 @@ MINLINE bool is_zero_v4(const float v[4])
   return (v[0] == 0.0f && v[1] == 0.0f && v[2] == 0.0f && v[3] == 0.0f);
 }
 
+MINLINE bool is_zero_v2_db(const double v[2])
+{
+  return (v[0] == 0.0 && v[1] == 0.0);
+}
+
+MINLINE bool is_zero_v3_db(const double v[3])
+{
+  return (v[0] == 0.0 && v[1] == 0.0 && v[2] == 0.0);
+}
+
+MINLINE bool is_zero_v4_db(const double v[4])
+{
+  return (v[0] == 0.0 && v[1] == 0.0 && v[2] == 0.0 && v[3] == 0.0);
+}
+
 MINLINE bool is_one_v3(const float v[3])
 {
   return (v[0] == 1.0f && v[1] == 1.0f && v[2] == 1.0f);