From bbf983bfbb3de7728db6bcdadd4059110cea356a Mon Sep 17 00:00:00 2001
From: Erwin Coumans <erwincoumans@google.com>
Date: Fri, 8 Nov 2019 16:10:05 -0800
Subject: [PATCH] reserve faces (minor performance improvement?)

---
 examples/TinyRenderer/model.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/examples/TinyRenderer/model.cpp b/examples/TinyRenderer/model.cpp
index 664765f12..d4ef4a617 100644
--- a/examples/TinyRenderer/model.cpp
+++ b/examples/TinyRenderer/model.cpp
@@ -126,10 +126,13 @@ int Model::nfaces()
 std::vector<int> Model::face(int idx)
 {
 	std::vector<int> face;
-	for (int i = 0; i < (int)faces_[idx].size(); i++) face.push_back(faces_[idx][i][0]);
-	return face;
+        face.reserve((int)faces_[idx].size());
+        for (int i = 0; i < (int)faces_[idx].size(); i++)
+          face.push_back(faces_[idx][i][0]);
+        return face;
 }
 
+
 Vec3f Model::vert(int i)
 {
 	return verts_[i];