text: // Copyright 2009-2020 Intel Corporation
  // SPDX-License-Identifier: Apache-2.0
  
  #include "string.h"
  
  #include <algorithm>
  #include <ctype.h>
  
  namespace embree
  {
    char to_lower(char c) { return char(tolower(int(c))); }
    char to_upper(char c) { return char(toupper(int(c))); }
    std::string toLowerCase(const std::string& s) { std::string dst(s); std::transform(dst.begin(), dst.end(), dst.begin(), to_lower); return dst; }
    std::string toUpperCase(const std::string& s) { std::string dst(s); std::transform(dst.begin(), dst.end(), dst.begin(), to_upper); return dst; }
  
    Vec2f string_to_Vec2f ( std::string str )
    {
      size_t next = 0;
      const float x = std::stof(str,&next); str = str.substr(next+1);
      const float y = std::stof(str,&next);
      return Vec2f(x,y);
    }
    
    Vec3f string_to_Vec3f ( std::string str )
    {
      size_t next = 0;
      const float x = std::stof(str,&next); str = str.substr(next+1);
      const float y = std::stof(str,&next); str = str.substr(next+1);
      const float z = std::stof(str,&next); 
      return Vec3f(x,y,z);
    }
    
    Vec4f string_to_Vec4f ( std::string str )
    {
      size_t next = 0;
      const float x = std::stof(str,&next); str = str.substr(next+1);
      const float y = std::stof(str,&next); str = str.substr(next+1);
      const float z = std::stof(str,&next); str = str.substr(next+1);
      const float w = std::stof(str,&next);
      return Vec4f(x,y,z,w);
    }
  }
  