In this case "lower level" means less messy, not less abstract, and more verbose, not more complex. A lot of Of constraining and not very valuable parts of Ope

In this case "lower level" means less messy, not less abstract, and more verbose, not more complex. A lot of Of constraining and not very valuable parts of OpenGL were replaced with do-it-yourself, making the API "retreat" from advanced complex solutions to more general and more portable building blocks.