print gl extensions

printGlExtensions

  string extensions = (const char*)glGetString(GL_EXTENSIONS);
  set<string> extensionSet;
  
  size_t strStart = 0;
  for (size_t i = 0; i < extensions.size(); ++i) {
      if (extensions[i] == ' ') {
          string ext = extensions.substr(strStart, i - strStart);
          extensionSet.insert(ext);
          strStart = i+1;
      }
  }

  string extensionSorted = "gles extension begin: \n";
  for (auto idx: extensionSet) {
      extensionSorted += idx + "\n";
  }
  
  extensionSorted += "gles extension end";
  SHANA_LOG("%s", extensionSorted.c_str());