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<div class="section" id="depth-stencil-alpha">
<span id="id1"></span><h1>Depth, Stencil, & Alpha<a class="headerlink" href="#depth-stencil-alpha" title="Permalink to this headline">¶</a></h1>
<p>These three states control the depth, stencil, and alpha tests, used to
discard fragments that have passed through the fragment shader.</p>
<p>Traditionally, these three tests have been clumped together in hardware, so
they are all stored in one structure.</p>
<p>During actual execution, the order of operations done on fragments is always:</p>
<ul class="simple">
<li>Stencil</li>
<li>Depth</li>
<li>Alpha</li>
</ul>
<div class="section" id="depth-members">
<h2>Depth Members<a class="headerlink" href="#depth-members" title="Permalink to this headline">¶</a></h2>
<dl class="docutils">
<dt>enabled</dt>
<dd>Whether the depth test is enabled.</dd>
<dt>writemask</dt>
<dd>Whether the depth buffer receives depth writes.</dd>
<dt>func</dt>
<dd>The depth test function. One of PIPE_FUNC.</dd>
</dl>
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<div class="section" id="stencil-members">
<h2>Stencil Members<a class="headerlink" href="#stencil-members" title="Permalink to this headline">¶</a></h2>
<p>XXX document valuemask, writemask</p>
<dl class="docutils">
<dt>enabled</dt>
<dd>Whether the stencil test is enabled. For the second stencil, whether the
two-sided stencil is enabled.</dd>
<dt>func</dt>
<dd>The stencil test function. One of PIPE_FUNC.</dd>
<dt>ref_value</dt>
<dd>Stencil test reference value; used for certain functions.</dd>
<dt>fail_op</dt>
<dd>The operation to carry out if the stencil test fails. One of
PIPE_STENCIL_OP.</dd>
<dt>zfail_op</dt>
<dd>The operation to carry out if the stencil test passes but the depth test
fails. One of PIPE_STENCIL_OP.</dd>
<dt>zpass_op</dt>
<dd>The operation to carry out if the stencil test and depth test both pass.
One of PIPE_STENCIL_OP.</dd>
</dl>
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<h2>Alpha Members<a class="headerlink" href="#alpha-members" title="Permalink to this headline">¶</a></h2>
<dl class="docutils">
<dt>enabled</dt>
<dd>Whether the alpha test is enabled.</dd>
<dt>func</dt>
<dd>The alpha test function. One of PIPE_FUNC.</dd>
<dt>ref_value</dt>
<dd>Alpha test reference value; used for certain functions.</dd>
</dl>
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<li><a class="reference external" href="">Depth, Stencil, & Alpha</a><ul>
<li><a class="reference external" href="#depth-members">Depth Members</a></li>
<li><a class="reference external" href="#stencil-members">Stencil Members</a></li>
<li><a class="reference external" href="#alpha-members">Alpha Members</a></li>
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