From 7d1dc710699abe4fd3df4a508c7b9120ce9ae46b Mon Sep 17 00:00:00 2001
From: Eric Wasylishen <ewasylishen@gmail.com>
Date: Sat, 22 Jul 2017 16:14:45 -0600
Subject: [PATCH] qbsp: add Face_Plane

---
 include/qbsp/brush.hh |  2 ++
 qbsp/brush.cc         | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/include/qbsp/brush.hh b/include/qbsp/brush.hh
index 6c1db835..4e18a88d 100644
--- a/include/qbsp/brush.hh
+++ b/include/qbsp/brush.hh
@@ -35,6 +35,8 @@ typedef struct brush_s {
 
 class mapbrush_t;
 
+plane_t Face_Plane(const face_t *face);
+
 int Brush_ListCountWithCFlags(const brush_t *brush, int cflags);
 int Brush_ListCount(const brush_t *brush);
 int Brush_NumFaces(const brush_t *brush);
diff --git a/qbsp/brush.cc b/qbsp/brush.cc
index f2bfe0a5..38c453ca 100644
--- a/qbsp/brush.cc
+++ b/qbsp/brush.cc
@@ -44,6 +44,28 @@ typedef struct hullbrush_s {
     int edges[MAX_HULL_EDGES][2];
 } hullbrush_t;
 
+/*
+=================
+Face_Plane
+=================
+*/
+plane_t
+Face_Plane(const face_t *face)
+{
+    const qbsp_plane_t *plane = &map.planes.at(face->planenum);
+    plane_t result;
+    
+    result.dist = plane->dist;
+    VectorCopy(plane->normal, result.normal);
+    
+    if (face->planeside) {
+        VectorScale(result.normal, -1.0, result.normal);
+        result.dist = -result.dist;
+    }
+    
+    return result;
+}
+
 /*
 =================
 CheckFace