From 3e34cfb96b1d094655ac8d8a9ead4d05ea62325c Mon Sep 17 00:00:00 2001
From: Nick Gasson <nick@nickg.me.uk>
Date: Sun, 7 Jun 2009 16:46:25 +0100
Subject: [PATCH] Use vertex arrays for small meshes

---
 include/IMesh.hpp | 2 ++
 src/Mesh.cpp      | 8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/IMesh.hpp b/include/IMesh.hpp
index 1dbe06c..2ccd0ab 100644
--- a/include/IMesh.hpp
+++ b/include/IMesh.hpp
@@ -43,6 +43,8 @@ struct IMeshBuffer {
    typedef unsigned Index;
 
    virtual ~IMeshBuffer() {}
+
+   virtual size_t vertexCount() const = 0;
    
    virtual void add(const Vertex& aVertex, const Normal& aNormal) = 0;
    virtual void add(const Vertex& aVertex, const Normal& aNormal,
diff --git a/src/Mesh.cpp b/src/Mesh.cpp
index e8798cd..97e832c 100644
--- a/src/Mesh.cpp
+++ b/src/Mesh.cpp
@@ -36,6 +36,8 @@ struct MeshBuffer : IMeshBuffer {
    MeshBuffer();
    ~MeshBuffer() {}
 
+   size_t vertexCount() const { return vertices.size(); }
+   
    void add(const Vertex& aVertex, const Normal& aNormal);
    void add(const Vertex& aVertex, const Normal& aNormal,
             const TexCoord& aTexCoord);
@@ -549,10 +551,10 @@ IMeshPtr makeMesh(IMeshBufferPtr aBuffer)
 {
    static bool havePrintedMeshChoice = false;
    
-   //aBuffer->printStats();
+   aBuffer->printStats();
 
-   // Prefer VBO meshes
-   if (GLEW_ARB_vertex_buffer_object) {
+   // Prefer VBOs for large meshes meshes
+   if (aBuffer->vertexCount() > 100 && GLEW_ARB_vertex_buffer_object) {
       if (!havePrintedMeshChoice) {
          log() << "Using VBO mesh implementation";
          havePrintedMeshChoice = true;
-- 
2.39.2