HP b2600 Reference Manual page 404

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glStencilFunc
The following values are accepted by func:
GL_NEVER
Always fails.
GL_LESS
Passes if (ref & mask) < (stencil & mask).
GL_LEQUAL
Passes if (ref & mask) (stencil & mask).
GL_GREATER
Passes if (ref & mask) > (stencil & mask).
GL_GEQUAL
Passes if (ref & mask)
GL_EQUAL
Passes if (ref & mask) = (stencil & mask).
GL_NOTEQUAL
Passes if (ref & mask)
GL_ALWAYS
Always passes.
Notes
Initially, the stencil test is disabled. If there is no stencil buffer, no stencil modification
can occur and it is as if the stencil test always passes.
Errors
•
•
Associated Gets
glGet with argument GL_STENCIL_FUNC
glGet with argument GL_STENCIL_VALUE_MASK
glGet with argument GL_STENCIL_REF
glGet with argument GL_STENCIL_BITS
glIsEnabled with argument GL_STENCIL_TEST
See Also
glAlphaFunc,
glBlendFunc,
glDepthFunc,
glEnable,
glIsEnabled,
glLogicOp,
glStencilOp
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(stencil & mask).
(stencil & mask).
GL_INVALID_ENUM is generated if func is not one of the eight accepted values.
GL_INVALID_OPERATION is generated if glStencilFunc is executed between the
execution of glBegin and the corresponding execution of glEnd.
Chapter 17