From a862768b65062376cb5396a2a49b699494dd9d33 Mon Sep 17 00:00:00 2001
From: Frank Galligan <fgalligan@google.com>
Date: Mon, 16 Oct 2017 11:57:49 -0700
Subject: [PATCH 1/2] Spec: Add ProcessInteriorEdges function

- This addresses a comment in KhronosGroup/glTF#1114
---
 docs/spec/edgebreaker.decoder.md   | 44 ++++++++++++++++++++++++++++++
 docs/spec/variable.descriptions.md |  2 ++
 2 files changed, 46 insertions(+)

diff --git a/docs/spec/edgebreaker.decoder.md b/docs/spec/edgebreaker.decoder.md
index ed4c223..2877cc2 100644
--- a/docs/spec/edgebreaker.decoder.md
+++ b/docs/spec/edgebreaker.decoder.md
@@ -360,3 +360,47 @@ void DecodeEdgeBreakerConnectivity() {
 }
 ~~~~~
 {:.draco-syntax }
+
+
+### ProcessInteriorEdges()
+
+~~~~~
+void ProcessInteriorEdges() {
+  while (active_corner_stack.size() > 0) {
+    corner_a = active_corner_stack.pop_back();
+    interior_face = eb_start_face_buffer.ReadBits32(1);
+    if (interior_face) {
+      corner_b = Previous(corner_a);
+      while (PosOpposite(corner_b) >= 0) {
+        b_opp = PosOpposite(corner_b);
+        corner_b = Previous(b_opp);
+      }
+      corner_c = Next(corner_a);
+      while (PosOpposite(corner_c) >= 0) {
+        c_opp = PosOpposite(corner_c);
+        corner_c = Next(c_opp);
+      }
+      new_corner = face_to_vertex[0].size() * 3;
+      SetOppositeCorners(new_corner, corner_a);
+      SetOppositeCorners(new_corner + 1, corner_b);
+      SetOppositeCorners(new_corner + 2, corner_c);
+
+      CornerToVerts(0, corner_a, &temp_v, &next_a, &temp_p);
+      CornerToVerts(0, corner_b, &temp_v, &next_b, &temp_p);
+      CornerToVerts(0, corner_c, &temp_v, &next_c, &temp_p);
+      MapCornerToVertex(new_corner, next_b);
+      MapCornerToVertex(new_corner + 1, next_c);
+      MapCornerToVertex(new_corner + 2, next_a);
+      face_to_vertex[0].push_back(next_b);
+      face_to_vertex[1].push_back(next_c);
+      face_to_vertex[2].push_back(next_a);
+
+      // Mark all three vertices as interior.
+      is_vert_hole_[next_b] = false;
+      is_vert_hole_[next_c] = false;
+      is_vert_hole_[next_a] = false;
+    }
+  }
+}
+~~~~~
+{:.draco-syntax }
diff --git a/docs/spec/variable.descriptions.md b/docs/spec/variable.descriptions.md
index 43e0b7f..279da78 100644
--- a/docs/spec/variable.descriptions.md
+++ b/docs/spec/variable.descriptions.md
@@ -139,6 +139,8 @@
   * Id of the last vertex decoded
 * bit_symbol_buffer
   * Standard EdgeBreaker encoded symbol buffer
+* active_corner_stack
+  * Array of current working corners used during EdgeBreaker decoding
 
 #### EdgeBreaker Traversal
 * eb_symbol_buffer_size

From 23494dbdbc80a272a295422bec44f50bba68236d Mon Sep 17 00:00:00 2001
From: Frank Galligan <fgalligan@google.com>
Date: Mon, 16 Oct 2017 12:49:57 -0700
Subject: [PATCH 2/2] Fix ReadBits call

---
 docs/spec/edgebreaker.decoder.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/spec/edgebreaker.decoder.md b/docs/spec/edgebreaker.decoder.md
index 2877cc2..3c16d0f 100644
--- a/docs/spec/edgebreaker.decoder.md
+++ b/docs/spec/edgebreaker.decoder.md
@@ -368,7 +368,7 @@ void DecodeEdgeBreakerConnectivity() {
 void ProcessInteriorEdges() {
   while (active_corner_stack.size() > 0) {
     corner_a = active_corner_stack.pop_back();
-    interior_face = eb_start_face_buffer.ReadBits32(1);
+    interior_face = eb_start_face_buffer.ReadBits(1);
     if (interior_face) {
       corner_b = Previous(corner_a);
       while (PosOpposite(corner_b) >= 0) {