glClearStencil - specify the clear value for the stencil buffer
void glClearStencil(GLint s)
sSpecifies the index used when the stencil buffer is cleared. The initial value is 0.
glClearStencil specifies the index used by glClear to clear the stencil buffer. s is masked with 2m - 1, where m is the number of bits in the stencil buffer.
glGet with argument GL_STENCIL_BITS
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glClear, glClearColor, glClearDepth, glGet, glStencilFunc, glStencilOp, glStencilMask