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