_glStencilMask: control the front and back writing of individual bits in the stencil planes
SUB _glStencilMask (BYVAL mask AS _UNSIGNED LONG) void _glStencilMask(GLuint mask);
- Specifies a bit mask to enable and disable writing of individual bits in the stencil planes. Initially, the mask is all 1's.
_glStencilMask 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. Use _glStencilMaskSeparate to set front and back stencil writemasks to different values.
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