From 4c59a00d2b4040d0ab33075e3aac274df8aee77f Mon Sep 17 00:00:00 2001
From: Eric Wasylishen <ewasylishen@gmail.com>
Date: Wed, 20 Jul 2016 19:05:55 -0600
Subject: [PATCH] light: add -debugvert command

---
 include/light/light.h |  3 +++
 light/light.cc        | 47 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/include/light/light.h b/include/light/light.h
index 5b307ca1..965603ae 100644
--- a/include/light/light.h
+++ b/include/light/light.h
@@ -228,6 +228,9 @@ extern sun_t *suns;
 
 extern int dump_facenum;
 extern bool dump_face;
+
+extern int dump_vertnum;
+extern bool dump_vert;
     
 /* command-line options */
 
diff --git a/light/light.cc b/light/light.cc
index b96f8a0f..22cef215 100644
--- a/light/light.cc
+++ b/light/light.cc
@@ -108,6 +108,11 @@ int dump_facenum = -1;
 bool dump_face;
 vec3_t dump_face_point = {0,0,0};
 
+int dump_vertnum = -1;
+bool dump_vert;
+vec3_t dump_vert_point = {0,0,0};
+
+
 void
 GetFileSpace(byte **lightdata, byte **colordata, byte **deluxdata, int size)
 {
@@ -1237,6 +1242,44 @@ void FindDebugFace(const bsp2_t *bsp)
     dump_facenum = facenum;
 }
 
+// returns the vert nearest the given point
+static int
+Vertex_NearestPoint(const bsp2_t *bsp, const vec3_t point)
+{
+    int nearest_vert = -1;
+    vec_t nearest_dist = VECT_MAX;
+    
+    for (int i=0; i<bsp->numvertexes; i++) {
+        const dvertex_t *vertex = &bsp->dvertexes[i];
+        
+        vec3_t distvec;
+        VectorSubtract(vertex->point, point, distvec);
+        vec_t dist = VectorLength(distvec);
+        
+        if (dist < nearest_dist) {
+            nearest_dist = dist;
+            nearest_vert = i;
+        }
+    }
+    
+    return nearest_vert;
+}
+
+void FindDebugVert(const bsp2_t *bsp)
+{
+    if (!dump_vert)
+        return;
+    
+    int v = Vertex_NearestPoint(bsp, dump_vert_point);
+    const dvertex_t *vertex = &bsp->dvertexes[v];
+    
+    logprint("FindDebugVert: dumping vert %d at %f %f %f\n", v,
+             vertex->point[0],
+             vertex->point[1],
+             vertex->point[2]);
+    dump_vertnum = v;
+}
+
 static void PrintUsage()
 {
     printf("usage: light [options] mapname.bsp\n"
@@ -1581,6 +1624,9 @@ main(int argc, const char **argv)
         } else if ( !strcmp( argv[ i ], "-debugface" ) ) {
             ParseVec3(dump_face_point, &i, argc, argv);
             dump_face = true;
+        } else if ( !strcmp( argv[ i ], "-debugvert" ) ) {
+            ParseVec3(dump_vert_point, &i, argc, argv);
+            dump_vert = true;
         } else if ( !strcmp( argv[ i ], "-sunlight" ) ) {
             sunlight.value = ParseVec(&i, argc, argv);
             sunlight.locked = true;
@@ -1691,6 +1737,7 @@ main(int argc, const char **argv)
     LoadEntities(bsp);
 
     FindDebugFace(bsp);
+    FindDebugVert(bsp);
     
     modelinfo = (modelinfo_t *)malloc(bsp->nummodels * sizeof(*modelinfo));
     FindModelInfo(bsp, lmscaleoverride);