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control the front and/or back writing of individual bits in the stencil planes

function glStencilMaskSeparate(int $face, int $mask) : void
  1. int $face Specifies whether the front and/or back stencil writemask is updated. Three symbolic constants are valid: GL_FRONT, GL_BACK, and GL_FRONT_AND_BACK.
  2. int $mask Specifies 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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