glClearStencil − specify the clear value for the stencil buffer
void glClearStencil( GLint s )
Specifies 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 $2 sup m^-^1$, where $m$ is the number of bits in the stencil buffer.
GL_INVALID_OPERATION is generated if glClearStencil is executed between the execution of glBegin and the corresponding execution of glEnd.
with argument GL_STENCIL_CLEAR_VALUE
glGet with argument GL_STENCIL_BITS
glClear(3G), glStencilFunc(3G), glStencilOp(3G), glStencilMask(3G)
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