update bundled_deps

bundled_deps/libigl/igl/opengl/create_index_vbo.cpp

@@ -0,0 +1,46 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public License 
+// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
+// obtain one at http://mozilla.org/MPL/2.0/.
+#include "create_index_vbo.h"
+
+// http://www.songho.ca/opengl/gl_vbo.html#create
+IGL_INLINE void igl::opengl::create_index_vbo(
+  const Eigen::MatrixXi & F,
+  GLuint & F_vbo_id)
+{
+  // Generate Buffers
+  glGenBuffers(1,&F_vbo_id);
+  // Bind Buffers
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,F_vbo_id);
+  // Copy data to buffers
+  // We expect a matrix with each vertex position on a row, we then want to
+  // pass this data to OpenGL reading across rows (row-major)
+  if(F.Options & Eigen::RowMajor)
+  {
+    glBufferData(
+      GL_ELEMENT_ARRAY_BUFFER,
+      sizeof(int)*F.size(),
+      F.data(),
+      GL_STATIC_DRAW);
+  }else
+  {
+    // Create temporary copy of transpose
+    Eigen::MatrixXi FT = F.transpose();
+    // If its column major then we need to temporarily store a transpose
+    glBufferData(
+      GL_ELEMENT_ARRAY_BUFFER,
+      sizeof(int)*F.size(),
+      FT.data(),
+      GL_STATIC_DRAW);
+  }
+  // bind with 0, so, switch back to normal pointer operation
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+}
+
+#ifdef IGL_STATIC_LIBRARY
+// Explicit template instantiation
+#endif