1 files changed, 20 insertions, 0 deletions

diff --git a/src/vischeck.cpp b/src/vischeck.cpp
index 97a2c12..c8c0942 100644
--- a/src/vischeck.cpp
+++ b/src/vischeck.cpp
@@ -232,6 +232,26 @@ void *trace_entity(const Vector &start, const Vector &end, void *ignore) {
   return tr.ent;
 }
 
+// True when a downward point trace from just above `point` finds a standable
+// surface. Used by edge jump: a ledge has no floor within the probe, slopes and
+// stairs do.
+bool point_ground(const Vector &point, void *ignore) {
+  if (!g_iface.enginetrace)
+    return false;
+  RayCompat ray;
+  Vector start{point.x, point.y, point.z + 4.0f};
+  Vector end{point.x, point.y, point.z - 96.0f};
+  make_ray(ray, start, end);
+  GameTraceCompat tr{};
+  EntityFilter filter(ignore);
+  using TraceRayFn = void (*)(void *, const RayCompat *, unsigned, void *,
+                              GameTraceCompat *);
+  vfunc<TraceRayFn>(g_iface.enginetrace, 4)(g_iface.enginetrace, &ray,
+                                            MASK_PLAYERSOLID, &filter, &tr);
+  // A start inside geometry means a wall/step there, not a ledge.
+  return tr.startsolid || tr.fraction < 1.0f;
+}
+
 // Vertical distance from the standing player hull's feet to the first
 // standable surface below. Matches CategorizePosition's 2-unit probe and its
 // plane.normal.z >= 0.7 rule, but sweeps much farther so the caller can