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glClearStencil - specify the clear value for the stencil buffer 
void glClearStencil( GLint s ) 
 eqn not supported
- 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. 
glGet with argument
GL_STENCIL_CLEAR_VALUE
glGet with argument GL_STENCIL_BITS 
glClear(3G)
, glStencilFunc(3G)
,
glStencilOp(3G)
, glStencilMask(3G)
 
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