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-.. _depth,stencil,&alpha:
-
-Depth, Stencil, & Alpha
-=======================
-
-These three states control the depth, stencil, and alpha tests, used to
-discard fragments that have passed through the fragment shader.
-
-Traditionally, these three tests have been clumped together in hardware, so
-they are all stored in one structure.
-
-During actual execution, the order of operations done on fragments is always:
-
-* Stencil
-* Depth
-* Alpha
-
-Depth Members
--------------
-
-enabled
- Whether the depth test is enabled.
-writemask
- Whether the depth buffer receives depth writes.
-func
- The depth test function. One of PIPE_FUNC.
-
-Stencil Members
----------------
-
-XXX document valuemask, writemask
-
-enabled
- Whether the stencil test is enabled. For the second stencil, whether the
- two-sided stencil is enabled.
-func
- The stencil test function. One of PIPE_FUNC.
-ref_value
- Stencil test reference value; used for certain functions.
-fail_op
- The operation to carry out if the stencil test fails. One of
- PIPE_STENCIL_OP.
-zfail_op
- The operation to carry out if the stencil test passes but the depth test
- fails. One of PIPE_STENCIL_OP.
-zpass_op
- The operation to carry out if the stencil test and depth test both pass.
- One of PIPE_STENCIL_OP.
-
-Alpha Members
--------------
-
-enabled
- Whether the alpha test is enabled.
-func
- The alpha test function. One of PIPE_FUNC.
-ref_value
- Alpha test reference value; used for certain functions.