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(svn r10746) -Codechange: add a generic superclass for almost all pool items so we do not have to duplicate code for each of the pool item classes and use it for the station and roadstop classes.
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<meta name="Description" content="Structure of OpenTTD (OTTD) landscape arrays #2">
<title>OpenTTD Landscape Internals - #2</title>
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<h3 style="font-weight: bold;">Landscape</h3>
<span style="font-weight: bold;"></span>Six attributes hold the information about a tile.
This can be seen in the <a href="landscape.html">Landscape</a> document. This page tries to give an overview of used and free bits of
the array so you can quickly see what is used and what is not.
<ul>
<li><span style="font-weight: bold;"><span class="free">O</span></span> - bit is free</li>
<li><span style="font-weight: bold;"><span class="used">X</span></span> - bit is used</li>
<li><span style="font-weight: bold;"><span class="abuse"> </span></span> - bit of attribute is abused for different purposes</li>
</ul>
<p>
<ul>
<li><span style="font-weight: bold;">type_height</span> - 8 bits in size, stores tile height (lower 4 bits) and tile class (upper 4 bits)</li>
<li><span style="font-weight: bold;">m1</span> - 8 bits in size, used to identify the owner of that tile (eg piece of rail, bridge, etc.)</li>
<li><span style="font-weight: bold;">m2</span> - 16 bits in size, used to identify the index of the given tile (object) in the (object-)array</li>
<li><span style="font-weight: bold;">m3</span> - 8 bits in size, is used for general storage</li>
<li><span style="font-weight: bold;">m4</span> - 8 bits in size, is used for general storage</li>
<li><span style="font-weight: bold;">m5</span> - 8 bits in size, is used for general storage</li>
<li><span style="font-weight: bold;">m6</span> - 8 bits in size, special meaning : lower 2 bits only valid in tropic climate, upper 2 bits for bridges</li>
<li><span style="font-weight: bold;">m7</span> - 8 bits in size, is used for general storage</li>
</ul>
<table align=center border="1" cellpadding="2" cellspacing="2">
<tbody>
<tr>
<th colspan=2>class</th>
<th>type_height (8)</th>
<th>m1 (8)</th>
<th>m2 (16)</th>
<th>m3 (8)</th>
<th>m4 (8)</th>
<th>m5 (8)</th>
<th>m6 (8)</th>
<th>m7 (8)</th>
</tr>
<tr>
<td colspan=2 class="caption">bits</td>
<td class="bits">7654 3210</td>
<td class="bits">7654 3210</td>
<td class="bits">FEDC BA98 7654 3210</td>
<td class="bits">7654 3210</td>
<td class="bits">7654 3210</td>
<td class="bits">7654 3210</td>
<td class="bits">7654 3210</td>
<td class="bits">7654 3210</td>
</tr>
<tr>
<td rowspan="2">0</td>
<td class="caption">ground</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits">XXXX XX<span class="free">OO</span></td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">farmland</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">XXXX XXXX XXXX XXXX</td>
<td class="bits"><span class="free">OOOO</span> XXXX</td>
<td class="bits">-inherit-</td>
<td class="bits"><span class="free">OOO</span>X XXXX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td rowspan=3>1</td>
<td class="caption">rail</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO O</span>XXX <span class="free">O</span>XXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">depot</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits"><span class="free">OOOO OOOO OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO</span> XXXX</td>
<td class="bits"><span class="free">OOOO</span> XXXX</td>
<td class="bits">XX<span class="free">OO O</span>XXX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">waypoint</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">XXXX XXXX XXXX XXXX</td>
<td class="bits"><span class="free">OOOO</span> XXXX</td>
<td class="bits"><span class="free">OOOO</span> XXXX</td>
<td class="bits">XX<span class="free">OO O</span>XXX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td rowspan=3>2</td>
<td class="caption">road</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
</tr>
<tr>
<td class="caption">level crossing</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">O</span>XXX XXXX</td>
<td class="bits">XX<span class="free">OO</span> XXXX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits">XXXX XXXX</td>
</tr>
<tr>
<td class="caption">road depot</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits"><span class="free">OOOO OOOO OOOO OOOO</span></td>
<td class="bits">X<span class="free">OOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits">XX<span class="free">OO</span> XXXX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits">XXX<span class="free">O OOOO</span></td>
</tr>
<tr>
<td>3</td>
<td class="caption">house</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX XXXX XXXX</td>
<td class="bits">XX<span class="free">O</span>X XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XX<span class="abuse">XX XXXX</span></td>
<td class="bits"><span class="abuse">XXXX XX</span>XX</td>
<td class="bits"><span class="abuse">X</span>XX<span class="abuse">X XXX</span>X</td>
</tr>
<tr>
<td>4</td>
<td class="caption">trees</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO</span> XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XX<span class="free">OO</span></td>
<td class="bits">XX<span class="free">OO O</span>XXX</td>
<td class="bits"><span class="free">OOOO OO</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td>5</td>
<td class="caption">station</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OO</span>XX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td>6</td>
<td class="caption">water</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OO</span>XX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td rowspan=3>8</td>
<td class="caption">industry</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="abuse">X</span><span class="free">OO</span><span class="abuse">X
XXXX</span></td>
<td class="bits">XXXX XXXX XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OO</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td>bubble/sugar/toffee,<BR>
gold/copper/coal,<BR>
oil wells, power station</td>
<td class="bits">-inherit-</td>
<td class="bits"><span class="abuse">X</span><span class="free">OOO OOOO</span></td>
<td class="bits">-inherit-</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td>toy factory</td>
<td class="bits">-inherit-</td>
<td class="bits"><span class="abuse">X</span><span class="free">OOO OOOO</span></td>
<td class="bits">-inherit-</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td rowspan=2>9</td>
<td class="caption">tunnel entrance</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO</span> XXXX</td>
<td class="bits">X<span class="free">OOO OOOO</span></td>
<td class="bits">X<span class="free">OOO</span> XXXX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td>bridge ramp</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO</span> <span class="abuse">XXXX</span>
<span class="free">OOOO</span></td>
<td class="bits"><span class="free">OOOO</span> XXXX</td>
<td class="bits">X<span class="free">OOO OOOO</span></td>
<td class="bits">X<span class="free">OOO</span> XXXX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td>A</td>
<td class="caption">unmovables</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
</tbody>
</table>
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