Prevent float rounding issues in LineVsPoly test

Closes #7
GaryOderNichts · May 8, 2022 · d08fff8 · d08fff8
1 parent 93f97d4
commit d08fff8
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/soh/src/code/z_bgcheck.c b/soh/src/code/z_bgcheck.c
@@ -398,6 +398,14 @@ s32 CollisionPoly_LineVsPoly(CollisionPoly* poly, Vec3s* vtxList, Vec3f* posA, V
         (poly->normal.x * posB->x + poly->normal.y * posB->y + poly->normal.z * posB->z) * COLPOLY_NORMAL_FRAC +
         plane.originDist;
 
+    // on some platforms this ends up as very small numbers due to rounding issues
+    if (IS_ZERO(planeDistA)) {
+        planeDistA = 0.0f;
+    }
+    if (IS_ZERO(planeDistB)) {
+        planeDistB = 0.0f;
+    }
+
     planeDistDelta = planeDistA - planeDistB;
     if ((planeDistA >= 0.0f && planeDistB >= 0.0f) || (planeDistA < 0.0f && planeDistB < 0.0f) ||
         (chkOneFace && planeDistA < 0.0f && planeDistB > 0.0f) || IS_ZERO(planeDistDelta)) {