glu

GLU offers simple interfaces for building mipmaps; checking for the
presence of extensions in the OpenGL (or other libraries which follow
the same conventions for advertising extensions); drawing
piecewise-linear curves, NURBS, quadrics and other primitives
(including, but not limited to, teapots); tesselating surfaces;
setting up projection matrices and unprojecting screen coordinates to
world coordinates.

          

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License: SGI-B-2.0
URL: http://cgit.freedesktop.org/mesa/glu/