control the front and/or back writing of individual bits in the stencil planes
$faceSpecifies whether the front and/or back stencil writemask is updated. Three symbolic constants are valid:
GL_FRONT, GL_BACK, and GL_FRONT_AND_BACK.
$maskSpecifies a bit mask to enable and disable writing of individual bits in the stencil planes. Initially, the mask is all 1's.
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