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(svn r20593) -Fix: (rlongago, r20547): long ago the service interval was int16, after which is got converted to Date except in the order backup. Much later I copied the savegame snippets from a vehicle and applied that on the order backup. Presto, reading/writing 32 bits (of Date) into 16 bits of ancient style service interval. That would then "spoil" the name pointer and that eventually crashes OpenTTD as it's likely to be an invalid pointer.
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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, i.e. other bits define the actual meaning.</li>
<li><span style="font-weight: bold;"><span class="option">~</span></span> - bit is accessed, but does not really have a meaning (e.g. owner of clear land is always OWNER_NONE)</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"><span class="free">OOO</span><span class="option">~ ~~~~</span></td>
<td class="bits"><span class="free">OOOO OOOO OOOO OOOO</span></td>
<td class="bits"><span class="free">OOO</span>X <span class="free">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">OOO</span>X XXXX</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</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"><span class="free">OOO</span>X XXXX</td>
<td class="bits"><span class="free">OOOO</span> XXXX <span class="free">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">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">rail with signals</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits"><span class="free">OOOO</span> XXXX XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">-inherit-</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">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">O</span>X <span class="free">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"><span class="free">OOO</span>X XXXX</td>
<td class="bits">XXXX XXXX XXXX XXXX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXXX X<span class="free">O</span>XX</td>
<td class="bits">XXX<span class="free">O</span> 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">-inherit-</td>
<td class="bits">XXXX<span class="free"> OOO</span>X</td>
<td class="bits">XXXX X<span class="free">O</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">-inherit-</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits">XX<span class="free">OO OO</span>XX</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">XXX<span class="option">~ ~~</span>XX</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXX<span class="abuse">X XXXX</span></td>
<td class="bits"><span class="abuse">XXXX XX</span>XX</td>
<td class="bits">XXXX <span class="abuse">XXXX</span></td>
</tr>
<tr>
<td>4</td>
<td class="caption">trees</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOO</span><span class="option">~ ~~~~</span></td>
<td class="bits"><span class="free">OOOO OOO</span>X XXXX XXXX</td>
<td class="bits"><span class="option">~~</span>XX 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 rowspan=7>5</td>
<td class="caption">rail station</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">O</span>XXX 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">XXXX XXXX</td>
</tr>
<tr>
<td class="caption">rail waypoint</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
</tr>
<tr>
<td class="caption">road stop</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">XXXX <span class="free">OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="option">~~~~ ~</span>XXX</td>
<td class="bits"><span class="free">OO</span>XX XXXX</td>
<td class="bits">XX<span class="free">O</span>X XXXX</td>
</tr>
<tr>
<td class="caption">dock</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</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="option">~~~~ ~</span>XXX</td>
<td class="bits"><span class="free">OO</span>XX X<span class="free">O</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">airport</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">XXXX <span class="free">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">OO</span>XX X<span class="free">O</span>XX</td>
<td class="bits">XXXX XXXX</td>
</tr>
<tr>
<td class="caption">buoy</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</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="option">~~~~ ~~~~</span></td>
<td class="bits"><span class="free">OO</span>XX X<span class="free">O</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">oilrig</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</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="option">~~~~ ~~~~</span></td>
<td class="bits"><span class="free">OO</span>XX X<span class="free">O</span>XX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td rowspan=3>6</td>
<td class="caption">sea, shore</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">O</span>XXX 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">X<span class="option">~~</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 class="caption">canal, river</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 OOOO</span></td>
<td class="bits">XXXX XXXX</td>
<td class="bits">-inherit-</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">shipdepot</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 OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits">-inherit-</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>8</td>
<td class="caption">industry</td>
<td class="bits">XXXX XXXX</td>
<td class="bits">XXX<span class="free">O</span> <span class="abuse">
XXXX</span></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">XXXX XXXX</td>
</tr>
<tr>
<td rowspan=2>9</td>
<td class="caption">tunnel entrance</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOO</span>X XXXX</td>
<td class="bits"><span class="free">OOOO OOOO OOOO OOOO</span></td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits">X<span class="free">OO</span>X XXXX</td>
<td class="bits">XX<span class="free">OO OO</span>XX</td>
<td class="bits">XXXX X<span class="free">O</span>XX</td>
</tr>
<tr>
<td>bridge ramp</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</td>
<td class="bits">-inherit-</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">-inherit-</td>
</tr>
<tr>
<td rowspan=2>A</td>
<td class="caption">objects</td>
<td class="bits">XXXX XXXX</td>
<td class="bits"><span class="free">O</span>XXX XXXX</td>
<td class="bits">XXXX XXXX XXXX XXXX</td>
<td class="bits">XXXX XXXX</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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