9. OpenGL Errors

• Because of Client/Server architecture, OpenGL can be hard to debug.

• Note: invalid function calls are quietly disregarded

• Best advice: apply small changes, compile and test often.

• Use glGetError() to determine which error has occurred:

  
      GL_NO_ERROR
      GL_INVALID_OPERATION // your command is ignored!!
      GL_INVALID_ENUM
      GL_INVALID_VALUE
      GL_OUT_OF_MEMORY
  
  

  For example,

  
      GLenum error_code = glGetError();
      if ( error_code != GL_NO_ERROR ) {
          /*...*/
      }