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cl-opengl is a set of bindings and utilities for accessing the OpenGL, GLU and GLUT APIs using CFFI. The examples/ directory contains a couple of examples using cl-glut, cl-opengl and cl-glu. Note, however, that you can use each of these independently. In particular, you can use a windowing toolkit other than (Free)GLUT, if you wish. build-time configuration: By default, cl-opengl checks for errors after GL calls where valid, and disables FP traps around ffi calls to match assumptions of C code in drivers. If these cause performance or other problems, they can be disabled by pushing :cl-opengl-no-check-error or :cl-opengl-no-masked-traps onto *features* before compiling cl-opengl (probably will need to clear .fasl caches or force a rebuild with asdf if cl-opengl has been loaded previously). When disabling the per-call masked fp traps in cl-opengl, you might need to do so yourself to run on some drivers. See with-float-traps-masked in the float-features library for a portable wrapper.