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57 lines
1.8 KiB
57 lines
1.8 KiB
// 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_vector_vbo.h"
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#include <cassert>
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// http://www.songho.ca/opengl/gl_vbo.html#create
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template <typename T>
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IGL_INLINE void igl::opengl::create_vector_vbo(
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const Eigen::Matrix<T,Eigen::Dynamic,Eigen::Dynamic> & V,
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GLuint & V_vbo_id)
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{
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//// Expects that input is list of 3D vectors along rows
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//assert(V.cols() == 3);
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// Generate Buffers
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glGenBuffers(1,&V_vbo_id);
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// Bind Buffers
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glBindBuffer(GL_ARRAY_BUFFER,V_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(V.Options & Eigen::RowMajor)
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{
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glBufferData(
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GL_ARRAY_BUFFER,
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sizeof(T)*V.size(),
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V.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::Matrix<T,Eigen::Dynamic,Eigen::Dynamic> VT = V.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_ARRAY_BUFFER,
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sizeof(T)*V.size(),
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VT.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_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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// generated by autoexplicit.sh
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template void igl::opengl::create_vector_vbo<int>(Eigen::Matrix<int, -1, -1, 0, -1, -1> const&, unsigned int&);
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// generated by autoexplicit.sh
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template void igl::opengl::create_vector_vbo<double>(Eigen::Matrix<double, -1, -1, 0, -1, -1> const&, unsigned int&);
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#endif
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