From 6dab4e48a6c51f4e52174df5e95ce60f2ec488bc Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop+git@gmail.com>
Date: Sun, 24 Apr 2011 19:14:07 -0400
Subject: [PATCH] build flat_vertices collection for VBO

---
 WFObj.cc | 18 +++++++++++++++++-
 WFObj.h  |  2 +-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/WFObj.cc b/WFObj.cc
index 88a8f10..7be41ad 100644
--- a/WFObj.cc
+++ b/WFObj.cc
@@ -442,12 +442,28 @@ bool WFObj::loadfile(const char *path, Buffer & buff)
 
 void WFObj::buildVBO()
 {
+    map<VertexRef, int> flat_vertices;
+    int vid = 0;
     glGenBuffers(1, &m_vbo);
     bool do_textures = m_loadtexture != NULL
         && m_vertices[VERTEX_TEXTURE].size() > 0;
+    for (map<string, vector<Face> >::iterator it = m_faces.begin();
+            it != m_faces.end();
+            it++)
+    {
+        for (vector<Face>::iterator fit = it->second.begin();
+                fit != it->second.end();
+                fit++)
+        {
+            for (int i = 0; i < 3; i++)
+            {
+                flat_vertices[fit->vertices[i]] = vid++;
+            }
+        }
+    }
 }
 
-bool WFObj::VertexRef::operator<(const VertexRef & other)
+bool WFObj::VertexRef::operator<(const VertexRef & other) const
 {
     if (vertex != other.vertex)
         return vertex < other.vertex;
diff --git a/WFObj.h b/WFObj.h
index 51568fa..b4c8ab4 100644
--- a/WFObj.h
+++ b/WFObj.h
@@ -61,7 +61,7 @@ protected:
             int vertex;
             int texture;
             int normal;
-            bool operator<(const VertexRef & other);
+            bool operator<(const VertexRef & other) const;
     };
 
     class Face