donaldmunro

public static void copyFile(File sourceFile, File destFile, final boolean isOverwrite) throws IOException {
  if (destFile.isDirectory())
     destFile = new File(destFile, sourceFile.getName());
  if (destFile.exists())
  {
     if (isOverwrite)
        destFile.delete();
     else
        throw new IOException(destFile.getAbsolutePath() + " exists");
  }

donaldmunro

/*
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

donaldmunro

/*
 Copyright (c) 2016, Donald Munro

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

donaldmunro

#include <eigen3/Eigen/Dense>
#include <eigen3/Eigen/Eigenvalues>
..
..
using RowMatrixXf = Eigen::Matrix<float, Eigen::Dynamic, Eigen::Dynamic, Eigen::RowMajor>;
Eigen::Map<RowMatrixXf> mapped(extended_homograpy.ptr<float>(), homography.rows, homography.cols);
Eigen::EigenSolver<Eigen::MatrixXf> eigen_solve(mapped, true);
auto ev = eigen_solve.eigenvectors();
std::cout << "No of EigenVectors = " << ev.cols() << std::endl;
for (auto i=0; i<ev.cols(); i++)

donaldmunro

size_t split(std::string s, std::vector<std::string>& tokens,
             std::string delim ="\t\n ")
{
   tokens.clear();
   size_t pos = s.find_first_not_of(delim);
   while (pos != std::string::npos)
   {
      size_t next = s.find_first_of(delim, pos);
      if (pos == std::string::npos)
         tokens.emplace_back(s.substr(pos));

donaldmunro

#include <glm/gtx/string_cast.hpp>
..
..
glm::mat4 mat;
..
..
std::cout << glm::to_string(mat) << std::endl;

donaldmunro

#include <glm/gtc/type_ptr.hpp>
..
glm::mat4 m = glm::mat4(1.0f);
..
auto p = glm::value_ptr(m);
std::cout << sizeof(p) << std::endl;
glUniformMatrix4fv(shader_uniform_m, 1, GL_FALSE, p);

donaldmunro

Compiling Boost for Android

1. Download Boost and cd to base directory.

2. Create Android toolchains for desired architectures by running a script as below:

   NDK=/opt/android-sdk/ndk-bundle/
   TOOLCHAINS="$PWD/toolchains/"

rm -rf $TOOLCHAINS

donaldmunro

# Using javah to generate .h files for Kotlin
# Assuming JNI function calls are in MainActivity.companion
STUDIO=/opt/android-studio
PACKAGE=my.package
$STUDIO/jre/bin/javah -jni -cp "$STUDIO/lib/kotlin-runtime.jar:build/tmp/kotlin-classes/debug" $PACKAGE.MainActivity.Companion

donaldmunro

#ifndef _BOUNDED_MAP_H
#define _BOUNDED_MAP_H

#include <iostream>
#include <map>
#include <vector>
#include  <utility>

/**
 * A wrapped std::multimap which limits size by removing the smallest keys first.