OpenGL入门系列- OpenGL版本查询

 void Context::getGLExtension()
   {
           const char* sVersion = (const char*)glGetString(GL_VERSION);
           this->_version = std::string(sVersion);

           const char* sShadingLanguageVersion =  (const char*)glGetString(GL_SHADING_LANGUAGE_VERSION);
           this->_shadingLanguageVersion = std::string(sShadingLanguageVersion);

           const char* sVendor =  (const char*)glGetString(GL_VENDOR);