: Specifies the index used when the stencil buffer is cleared. The initial value is 0.
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'''_glClearStencil''' specifies the index used by {{KW|_glClear}} to clear the stencil buffer. {{Parameter|s}} is masked with 2<sup>m</sup> - 1, where m is the number of bits in the stencil buffer.
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{{KW|_glGet}} with argument {{KW|_GL_STENCIL_CLEAR_VALUE}}
{{KW|_glGet}} with argument {{KW|_GL_STENCIL_BITS}}