pushmatrix - pushes down the transformation matrix stack
pushmatrix pushes down the transformation matrix stack, duplicating the
current matrix. For example, if the stack contains one matrix, M, after
a call to pushmatrix, the stack contains two copies of M. Only the top
copy can be modified.
pushmatrix operates on the single transformation stack when mmode is
MSINGLE, and on the ModelView matrix stack when mmode is MVIEWING. It
should not be called when mmode is MPROJECTION or MTEXTURE.
getmatrix, loadmatrix, mmode, multmatrix, popmatrix
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