There are at least two interfaces to OpenGL for MLton/SML, both of which should be considered alpha quality.
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MikeThomas built a low-level interface, directly translating many of the functions, covering GL, GLU, and GLUT. This is available in the MLton Sources:
opengl. The code contains a number of small, standard OpenGL examples translated to SML. -
ChrisClearwater has written at least an interface to GL, and possibly more. See
Contact us for more information or an update on the status of these projects.