| // 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/. | |
| // 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); | |
| } | |
| // Explicit template instantiation | |