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<div class="subTitle">com.badlogic.gdx.graphics.g3d.decals
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<h2 title="Interface GroupStrategy" class="title">Interface GroupStrategy
</h2>
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<dt>All Known Implementing Classes:
</dt>
<dd><a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/CameraGroupStrategy.html" title="class in com.badlogic.gdx.graphics.g3d.decals">CameraGroupStrategy
</a>,
<a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/DefaultGroupStrategy.html" title="class in com.badlogic.gdx.graphics.g3d.decals">DefaultGroupStrategy
</a>,
<a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/PluggableGroupStrategy.html" title="class in com.badlogic.gdx.graphics.g3d.decals">PluggableGroupStrategy
</a>,
<a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/SimpleOrthoGroupStrategy.html" title="class in com.badlogic.gdx.graphics.g3d.decals">SimpleOrthoGroupStrategy
</a></dd>
</dl>
<hr>
<br>
<pre>public interface
<span class="strong">GroupStrategy
</span></pre>
<div class="block"><p>
This class provides hooks which are invoked by
<a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/DecalBatch.html" title="class in com.badlogic.gdx.graphics.g3d.decals"><code>DecalBatch
</code></a> to evaluate the group a sprite falls into, as well as to
adjust settings before and after rendering a group.
</p>
<p>
A group is identified by an integer. The
<a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/GroupStrategy.html#beforeGroup(int, com.badlogic.gdx.utils.Array)"><code>beforeGroup()
</code></a> method provides the strategy with a list
of all the decals, which are contained in the group itself, and will be rendered before the associated call to
<a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/GroupStrategy.html#afterGroup(int)"><code>afterGroup(int)
</code></a>.
<br/>
A call to
<code>beforeGroup()
</code> is always fallowed by a call to
<code>afterGroup()
</code>.
<br/>
<b>Groups are always invoked based on their ascending int values
</b>. Group -10 will be rendered before group -5, group -5
before group 0, group 0 before group 6 and so on.
<br/>
The call order for a single flush is always
<code>beforeGroups(), beforeGroup1(), afterGroup1(), ... beforeGroupN(),
afterGroupN(), afterGroups()
</code>.
</p>
<p>
The contents of the
<code>beforeGroup()
</code> call can be modified at will to realize view frustum culling, material
& depth
sorting, ... all based on the requirements of the current group. The batch itself does not change OpenGL settings except for
whichever changes are entailed <a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/DecalMaterial.html#set()"><code>DecalMaterial.set()</code></a>. If the group requires a special shader, blending,
<a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/GroupStrategy.html#getGroupShader(int)"><code>getGroupShader(int)</code></a> should return it so that DecalBatch can apply it while rendering the group.
</p></div>
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<h3>Method Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type
</th>
<th class="colLast" scope="col">Method and Description
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<tr class="altColor">
<td class="colFirst"><code>void
</code></td>
<td class="colLast"><code><strong><a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/GroupStrategy.html#afterGroup(int)">afterGroup
</a></strong>(int
group)
</code>
<div class="block">Invoked directly after rendering of a group has completed
</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void
</code></td>
<td class="colLast"><code><strong><a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/GroupStrategy.html#afterGroups()">afterGroups
</a></strong>()
</code>
<div class="block">Invoked after having rendered all groups
</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void
</code></td>
<td class="colLast"><code><strong><a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/GroupStrategy.html#beforeGroup(int, com.badlogic.gdx.utils.Array)">beforeGroup
</a></strong>(int
group,
<a href="../../../../../../com/badlogic/gdx/utils/Array.html" title="class in com.badlogic.gdx.utils">Array
</a><<a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/Decal.html" title="class in com.badlogic.gdx.graphics.g3d.decals">Decal
</a>> contents)
</code>
<div class="block">Invoked directly before rendering the contents of a group
</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void
</code></td>
<td class="colLast"><code><strong><a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/GroupStrategy.html#beforeGroups()">beforeGroups
</a></strong>()
</code>
<div class="block">Invoked before rendering any group
</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int
</code></td>
<td class="colLast"><code><strong><a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/GroupStrategy.html#decideGroup(com.badlogic.gdx.graphics.g3d.decals.Decal)">decideGroup
</a></strong>(
<a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/Decal.html" title="class in com.badlogic.gdx.graphics.g3d.decals">Decal
</a> decal)
</code>
<div class="block">Assigns a group to a decal
</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../../com/badlogic/gdx/graphics/glutils/ShaderProgram.html" title="class in com.badlogic.gdx.graphics.glutils">ShaderProgram
</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/GroupStrategy.html#getGroupShader(int)">getGroupShader
</a></strong>(int
group)
</code>
<div class="block">Returns the shader to be used for the group.
</div>
</td>
</tr>
</table>
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<a name="getGroupShader(int)">
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<h4>getGroupShader
</h4>
<pre><a href="../../../../../../com/badlogic/gdx/graphics/glutils/ShaderProgram.html" title="class in com.badlogic.gdx.graphics.glutils">ShaderProgram
</a> getGroupShader(int
group)
</pre>
<div class="block">Returns the shader to be used for the group. Can be null in which case the GroupStrategy doesn't support GLES 2.0
</div>
<dl><dt><span class="strong">Parameters:
</span></dt><dd><code>group
</code> - the group
</dd>
<dt><span class="strong">Returns:
</span></dt><dd>the
<a href="../../../../../../com/badlogic/gdx/graphics/glutils/ShaderProgram.html" title="class in com.badlogic.gdx.graphics.glutils"><code>ShaderProgram
</code></a></dd></dl>
</li>
</ul>
<a name="decideGroup(com.badlogic.gdx.graphics.g3d.decals.Decal)">
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<h4>decideGroup
</h4>
<pre>int
decideGroup(
<a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/Decal.html" title="class in com.badlogic.gdx.graphics.g3d.decals">Decal
</a> decal)
</pre>
<div class="block">Assigns a group to a decal
</div>
<dl><dt><span class="strong">Parameters:
</span></dt><dd><code>decal
</code> - Decal to assign group to
</dd>
<dt><span class="strong">Returns:
</span></dt><dd>group assigned
</dd></dl>
</li>
</ul>
<a name="beforeGroup(int, com.badlogic.gdx.utils.Array)">
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<h4>beforeGroup
</h4>
<pre>void
beforeGroup(int
group,
<a href="../../../../../../com/badlogic/gdx/utils/Array.html" title="class in com.badlogic.gdx.utils">Array
</a><<a href="../../../../../../com/badlogic/gdx/graphics/g3d/decals/Decal.html" title="class in com.badlogic.gdx.graphics.g3d.decals">Decal
</a>> contents)
</pre>
<div class="block">Invoked directly before rendering the contents of a group
</div>
<dl><dt><span class="strong">Parameters:
</span></dt><dd><code>group
</code> - Group that will be rendered
</dd><dd><code>contents
</code> - Array of entries of arrays containing all the decals in the group
</dd></dl>
</li>
</ul>
<a name="afterGroup(int)">
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<h4>afterGroup
</h4>
<pre>void
afterGroup(int
group)
</pre>
<div class="block">Invoked directly after rendering of a group has completed
</div>
<dl><dt><span class="strong">Parameters:
</span></dt><dd><code>group
</code> - Group which completed rendering
</dd></dl>
</li>
</ul>
<a name="beforeGroups()">
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<h4>beforeGroups
</h4>
<pre>void
beforeGroups()
</pre>
<div class="block">Invoked before rendering any group
</div>
</li>
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<a name="afterGroups()">
<!-- -->
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<h4>afterGroups
</h4>
<pre>void
afterGroups()
</pre>
<div class="block">Invoked after having rendered all groups
</div>
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