glStencilMaskSeparate - control the front and/or back writing of individual bits
in the stencil planes
void glStencilMaskSeparate(GLenum 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.
Specifies a bit mask to enable and disable writing of
individual bits in the stencil planes. Initially, the mask is all 1's.
glStencilMaskSeparate controls the writing of individual bits in the
stencil planes. The least significant n bits of mask, where n is the
number of bits in the stencil buffer, specify a mask. Where a 1 appears in the
mask, it's possible to write to the corresponding bit in the stencil buffer.
Where a 0 appears, the corresponding bit is write-protected. Initially, all
bits are enabled for writing.
There can be two separate mask writemasks; one affects
back-facing polygons, and the other affects front-facing polygons as well as
other non-polygon primitives. glStencilMask() sets both front and
back stencil writemasks to the same values, as if
glStencilMaskSeparate() were called with face set to
GL_INVALID_ENUM is generated if face is not one of the accepted
glGet() with argument GL_STENCIL_WRITEMASK,
GL_STENCIL_BACK_WRITEMASK, or GL_STENCIL_BITS
glColorMask(), glDepthMask(), glStencilFunc(),
glStencilFuncSeparate(), glStencilMask(), glStencilOp(),
Copyright © 2006 Khronos Group. This material may be distributed subject
to the terms and conditions set forth in the Open Publication License, v 1.0,
8 June 1999. http://opencontent.org/openpub/.
Copyright © 1991-2006 Silicon Graphics, Inc.
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