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OpenTTD-patches/docs/landscape_grid.html
Peter Nelson b2a1ec96f1 Change: Store station blocked/wires/pylons flags in map. 
This stores three flags in unused map bits, and avoids having to look up
station graphics and custom station specs to determine blocked/wires/pylons
status.

This potentially affects rail pathfinding performance.

Savegame version is not bumped, as the flags can just be updated every
time.

(cherry picked from commit cb658e6cc6e1c114c1eaafaaa5b14849f04ca083)
2023-09-30 12:39:09 +01:00

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="Description" content="Structure of OpenTTD (OTTD) landscape arrays #2">
<title>OpenTTD Landscape Internals - #2</title>
<style type="text/css">
span.free { font-family: "Courier New", Courier, mono; background-color: rgb( 70, 190, 70); }
span.usable { font-family: "Courier New", Courier, mono; background-color: rgb( 50, 150, 150); }
span.used { font-family: "Courier New", Courier, mono; background-color: rgb(120, 120, 255); }
span.pool { font-family: "Courier New", Courier, mono; background-color: rgb(220, 120, 255); }
span.patch { font-family: "Courier New", Courier, mono; background-color: rgb(255, 165, 0); }
span.abuse { font-family: "Courier New", Courier, mono; background-color: rgb(255, 100, 100); }
span.rearrange{ font-family: "Courier New", Courier, mono; background-color: rgb(160, 160, 255); }
span.patch-pool{ font-family: "Courier New", Courier, mono; background: repeating-linear-gradient(-45deg, rgb(255, 165, 0), rgb(255, 165, 0) 10px, rgb(220, 120, 255) 10px, rgb(220, 120, 255) 20px); }
td.bits { white-space: nowrap; text-align: center; font-family: "Courier New", Courier, mono; }
td.caption { white-space: nowrap; text-align: left; }
td li { white-space: nowrap; text-align: left; }
th { white-space: nowrap; text-align: center; }
</style>
</head>
<body style="direction: ltr;">
<h3 style="font-weight: bold;">Landscape</h3>
<span style="font-weight: bold;"></span>Nine 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;">type</span> - 8 bits in size, tile class (bits 4..7), bridge (bits 2..3) tropic zone (bits 0..1, only valid in tropic climate)</li>
<li><span style="font-weight: bold;">height</span> - 8 bits in size, stores tile height</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, is used for general storage</li>
<li><span style="font-weight: bold;">m7</span> - 8 bits in size, is used for general storage</li>
<li><span style="font-weight: bold;">m8</span> - 16 bits in size, is used for general storage</li>
</ul>
<p>
<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="usable">X</span></span> - bit is used, but could be freed if needed</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="pool">X</span></span> - bit is used for an index on a pool</li>
<li><span style="font-weight: bold;"><span class="patch">P</span></span> - bit is introduced by a patch</li>
<li><span style="font-weight: bold;"><span class="abuse">X</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="rearrange">X</span></span> - bit is accessed, but a rearrangement of the map array could free some of these bits (probably not done for bit alignment)</li>
</ul>
<table align=center border="1" cellpadding="2" cellspacing="2">
<tbody>
<tr>
<th colspan=2>class</th>
<th>type (8)</th>
<th>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>
<th>m8 (16)</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">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>
<td class="bits">FEDC BA98 7654 3210</td>
</tr>
<tr>
<td rowspan="2">0</td>
<td class="caption">ground</td>
<td class="bits" rowspan=30><span class="used" title="Tile type">XXXX</span> <span class="used" title="Presence and direction of bridge above">XX</span> <span class="used" title="Tropic Zone: only meaningful in tropic climate. It contains the definition of the available zones">XX</span></td>
<td class="bits" rowspan=30><span class="used" title="Tile height">XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="free">OOO</span><span class="usable" title="Owner (always OWNER_NONE)">1 OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO OOOO OOOO</span></td>
<td class="bits"><span class="used" title="Type of hedge on NE border">XXX</span> <span class="used" title="Snow presence">X</span><span class="free">OOOO</span></td>
<td class="bits" rowspan=2><span class="used" title="Type of hedge on SW border">XXX</span> <span class="used" title="Type of hedge on SE border">XXX</span><span class="free">OO</span></td>
<td class="bits" rowspan=2><span class="used" title="Update counter">XXX</span> <span class="used" title="Type: grass, rough land, rocks, fields, snow, desert">XXX</span> <span class="used" title="Density">XX</span></td><td class="bits" rowspan=2><span class="free" >OOO</span><span class="used" title="Type of hedge on NW border">X XX</span><span class="free">OO</span></td>
<td class="bits" rowspan=2><span class="free">OOOO OOOO</span></td>
<td class="bits" rowspan=2><span class="free">OOOO OOOO OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">farmland</td>
<td class="bits"><span class="pool" title="Industry index on pool">XXXX XXXX XXXX XXXX</span></td>
<td class="bits"><span class="used" title="Type of hedge on NE border">XXX</span> <span class="used" title="Field production stage">XXXXX</span></td>
</tr>
<tr>
<td rowspan=3>1</td>
<td class="caption">rail</td>
<td class="bits" rowspan=3><span class="used" title="Ship docking tile status (for half-tile with water)">X</span><span class="free">OO</span><span class="used" title="Owner">X XXXX</span></td>
<td class="bits"><span class="free">OOOO</span> <span class="used" title="Reserved tracks">XXXX</span> <span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span> </td>
<td class="bits"><span class="free">OOOO</span> <span class="used" title="Ground type: fences, snow, desert">XXXX</span></td>
<td class="bits"><span class="used" title="Rail tile type: rail, rail with signals, depot">OO</span> <span class="used" title="Track pieces">XXXXXX</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" rowspan=2><span class="free">OOOO</span> <span class="patch" title="Secondary railway type (used for lower or right track when two parallel tracks on tile)">PPPP PP</span><span class="used" title="Railway type">XX XXXX</span></td>
</tr>
<tr>
<td class="caption">rail with signals</td>
<td class="bits"><span class="free">OOO</span><span class="patch" title="1 or more routing restrictions present">P</span> <span class="used" title="Reserved tracks">XXXX</span> <span class="used" title="Signal types and sempahore/lights">XXXX XXXX</span></td>
<td class="bits"><span class="used" title="Signals present">XXXX</span> <span class="free">OOOO</span></td>
<td class="bits"><span class="used" title="Signals colors">XXXX</span> <span class="used" title="Ground type: fences, snow, desert">XXXX</span></td>
<td class="bits"><span class="used" title="Rail tile type: rail, rail with signals, depot">O1</span> <span class="used" title="Track pieces">XXXXXX</span></td>
<td class="bits"><span class="patch" title="Signal styles">PPPP PPPP</span></td>
<td class="bits"><span class="patch" title="Signal always reserve through">PP</span> <span class="patch" title="Signal aspects">PPPPPP</span></td>
</tr>
<tr>
<td class="caption">depot</td>
<td class="bits"><span class="pool" title="Depot index on pool">XXXX XXXX XXXX XXXX</span></td>
<td class="bits"><span class="free">OOOO</span> <span class="free">OOOO</span></td>
<td class="bits"><span class="free">OOOO</span> <span class="used" title="Ground type: fences, snow, desert (fences on depot are not valid)">XXXX</span></td>
<td class="bits"><span class="used" title="Rail tile type: rail, rail with signals, depot">11</span><span class="free">O</span><span class="used" title="PBS reservation">X</span> <span class="free">OO</span><span class="used" title="Depot exit direction">XX</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 OOOO OO</span><span class="used" title="Railway type">XX XXXX</span></td>
</tr>
<tr>
<td rowspan=3>2</td>
<td class="caption">road</td>
<td class="bits"><span class="free">OOO</span><span class="used" title="Owner of road">X XXXX</span></td>
<td class="bits" rowspan=2><span class="pool" title="Town index on pool">XXXX XXXX XXXX XXXX</span></td>
<td class="bits"><span class="used" title="Owner of tram">XXXX</span> <span class="used" title="Tram pieces">XXXX</span></td>
<td class="bits" rowspan=3><span class="free">OO</span><span class="used" title="Road type">XX XXXX</span></td>
<td class="bits"><span class="used" title="Tile type: simple road (00), level crossing (01), road depot (10)">OO</span> <span class="used" title="Disallow vehicles to go a specific direction">XX</span> <span class="used" title="Road pieces">XXXX</span></td>
<td class="bits"><span class="free">OO</span> <span class="used" title="Pavement type">XXX</span><span class="free">OOO</span></td>
<td class="bits"><span class="free">OO</span><span class="used" title="Snow/desert present">X</span> <span class="free">O</span><span class="used" title="Roadworks counter">XXXX</span></td>
<td class="bits" rowspan=1><span class="free">O</span><span class="patch" title="Road cached one way state">PPP</span> <span class="used" title="Tram type">XXXX XX<span class="free">OO OOOO</span></td>
</tr>
<tr>
<td class="caption">level crossing</td>
<td class="bits"><span class="free">OOO</span><span class="used" title="Owner of rail track">X XXXX</span></td>
<td class="bits"><span class="used" title="Owner of tram">XXXX</span> <span class="free">OOOO</span></td>
<td class="bits"><span class="used" title="Tile type: simple road (00), level crossing (01), road depot (10)">O1</span> <span class="used" title="Lights are on">X</span> <span class="used" title="PBS reservation">X</span><span class="free">OO</span><span class="patch" title="Crossing is possibly occupied by a road vehicle">P</span><span class="used" title="Direction of the rail and roads">X</span></td>
<td class="bits"><span class="free">OO</span> <span class="used" title="Pavement type">XXX</span><span class="free">OOO</span></td>
<td class="bits"><span class="free">OO</span><span class="used" title="Snow/desert present">X</span> <span class="used" title="Owner of road">XXXXX</span></td>
<td class="bits" rowspan=1><span class="free">O</span><span class="patch" title="Road cached one way state">PPP</span> <span class="used" title="Tram type">XXXX XX</span> <span class="used" title="Railway type">XXXXXX</span></td>
</tr>
<tr>
<td class="caption">road depot</td>
<td class="bits"><span class="free">OOO</span><span class="used" title="Owner of the depot">X XXXX</span></td>
<td class="bits"><span class="pool" title="Depot index on pool">XXXX XXXX XXXX XXXX</span></td>
<td class="bits"><span class="usable" title="Owner of tram depot">XXXX</span> <span class="free">OOOO</span></td>
<td class="bits"><span class="used" title="Tile type: simple road (00), level crossing (01), road depot (10)">1O</span><span class="free">OO OO</span><span class="used" title="Depot exit direction">XX</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="free">OO</span><span class="used" title="Snow/desert present">X</span> <span class="usable" title="Owner of road depot">XXXXX</span></td>
<td class="bits" rowspan=1><span class="free">O</span><span class="patch" title="Road cached one way state">PPP</span> <span class="used" title="Tram type">XXXX XX</span><span class="free">OO OOOO</span></td>
</tr>
<tr>
<td rowspan=2>3</td>
<td class="caption">finished house</td>
<td class="bits" rowspan=2><span class="used" title="House random bits">XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="pool" title="Town index on pool">XXXX XXXX XXXX XXXX</span></td>
<td class="bits"><span class="used" title="House is complete/in construction (see m5)">1</span> <span class="used" title="House type (m4 + m3[6])">X</span><span class="free">O</span><span class="usable" title="Activated triggers (bits 2..4 don't have a meaning)">XXX</span><span class="used" title="Activated triggers (bits 2..4 don't have a meaning)">XX</span></td>
<td class="bits" rowspan=2><span class="used" title="House type (m4 + m3[6])">XXXX XXXX</span></td>
<td class="bits"><span class="used" title="Age in years, clamped at 255">XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="abuse" title="Newhouses activated: periodic processing time remaining; if not, lift position for houses 04 and 05">XXXX XX</span><span class="free">OO</span></td>
<td class="bits" rowspan=2><span class="abuse" title="If newhouses active, m7 is the current animation frame">XXXX</span> <span class="abuse" title="If newhouses active, m7 is the current animantion frame; if not, lift behaviour for houses 04 and 05">XXXX</span></td>
<td class="bits" rowspan=2><span class="free">OOOO OOOO OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">house under construction</td>
<td class="bits"><span class="used" title="House is complete/in construction (see m5)">O</span> <span class="used" title="House type (m4 + m3[6])">X</span><span class="free">O</span><span class="usable" title="Activated triggers (bits 2..4 don't have a meaning)">XXX</span><span class="used" title="Activated triggers (bits 2..4 don't have a meaning)">XX</span></td>
<td class="bits"><span class="free">OOO</span><span class="used" title="Construction stage">XX</span> <span class="used" title="Construction counter">XXX</span></td>
</tr>
<tr>
<td>4</td>
<td class="caption">trees</td>
<td class="bits"><span class="free">O</span><span class="used" title="Water class">XX</span><span class="usable" title="Owner (always OWNER_NONE)">1 OOOO</span></td>
<td class="bits"><span class="free">OOOO OOO</span><span class="used" title="Tree ground">XXX</span> <span class="used" title="Tree density">XX</span> <span class="free" title="Old tree counter">OOOO</span></td>
<td class="bits"><span class="usable" title="Tree type unused bits">XX</span><span class="used" title="Tree type">XX XXXX</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="used" title="Number of trees on tile (+1)">XX</span><span class="free">OO O</span><span class="used" title="Tree growth">XXX</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 OOOO OOOO OOOO</span></td>
</tr>
<tr>
<td rowspan=8>5</td>
<td class="caption">rail station</td>
<td class="bits" rowspan=8><span class="free">O</span><span class="used" title="Water class">XX</span> <span class="used" title="Owner">XXXXX</span></td>
<td class="bits" rowspan=8><span class="pool" title="Station index on pool">XXXX XXXX XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="used" title="Random bits">XXXX</span> <span class="free">OOOO</span></td>
<td class="bits" rowspan=2><span class="used" title="Custom station specifications ID">XXXX XXXX</span></td>
<td class="bits"><span class="used" title="Graphics index">XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="used" title="May have pylons">X</span> <span class="patch" title="Station type (extra bit)">P</span><span class="used" title="Station type">XXX</span> <span class="used" title="Reserved track">X</span><span class="patch" title="May have wires (moved from bit 6)">P</span><span class="used" title="Tile is blocked">X</span></td>
<td class="bits" rowspan=2><span class="used" title="Animation frame">XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="free">OOOO OOOO OO</span><span class="used" title="Railway type">XX XXXX</span></td>
</tr>
<tr>
<td class="caption">rail waypoint</td>
<td class="bits"><span class="usable" title="Graphics index">OOOO OOO</span><span class="used" title="Graphics index">X</span></td>
</tr>
<tr>
<td class="caption">road stop</td>
<td class="bits"><span class="used" title="Owner of tram">XXXX</span> <span class="free">OO</span><span class="patch" title="Disallow vehicles to go a specific direction (drive-through road stop)">PP</span></td>
<td class="bits" rowspan=2><span class="free">OO</span><span class="used" title="Roadtype for road stop">XX XXXX</span></td>
<td class="bits" rowspan=2><span class="usable" title="Graphics index">OOOO O</span><span class="used" title="Graphics index: 00 (exit towards NE), 01 (exit towards SE), 02 (exit towards SW), 03 (exit towards NW), 04 (drive through X), 05 (drive through Y)">XXX</span></td>
<td class="bits" rowspan=6><span class="free">O<span class="patch" title="Station type (extra bit)">P</span></span><span class="used" title="Station type">XXX</span> <span class="free">OOO</span></td>
<td class="bits" rowspan=2><span class="free">OOO</span><span class="used" title="Owner of road">X XXXX</span></td>
<td class="bits"><span class="free">O</span><span class="patch" title="Road cached one way state">PPP</span> <span class="used" title="Tram type">XXXX XX</span><span class="patch" title="Custom road stops specifications ID">PP PPPP</span></td>
</tr>
<tr>
<td class="caption">road waypoint</td>
<td class="bits"><span class="used" title="Owner of tram">XXXX</span> <span class="patch" title="Pavement type">PP</span> <span class="patch" title="Disallow vehicles to go a specific direction (drive-through road stop)">PP</span></td>
<td class="bits"><span class="patch" title="Snow/desert present">P</span> <span class="patch" title="Road cached one way state">PPP</span> <span class="used" title="Tram type">XXXX XX</span><span class="patch" title="Custom road stops specifications ID">PP PPPP</span></td>
</tr>
<tr>
<td class="caption">airport</td>
<td class="bits"><span class="used" title="Random bits">XXXX</span> <span class="free">OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="used" title="Graphics index">XXXX XXXX</span></td>
<td class="bits"><span class="used" title="Animation frame">XXXX XXXX</span></td>
<td class="bits" rowspan=4><span class="free">OOOO OOOO OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">dock</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="usable" title="Graphics index">OOOO </span><span class="usable" title="Graphics index">O</span><span class="used" title="Graphics index">XXX</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">buoy</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="usable">OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">oilrig</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="usable">OOOO OOOO</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
</tr>
<tr>
<td rowspan=4>6</td>
<td class="caption">sea, shore</td>
<td class="bits" rowspan=4><span class="used" title="Ship docking tile status">X</span> <span class="used" title="Water class">XX</span> <span class="used" title="Owner">XXXXX</span></td>
<td class="bits" rowspan=3><span class="free">OOOO OOOO OOOO OOOO</span></td>
<td class="bits" rowspan=4><span class="free">OOOO OOO</span><span class="patch" title="No flooding state">P</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="used" title="Water tile type: coast, clear, lock, depot">O<span class="usable">OO</span>O</span> <span class="free">OOO</span><span class="used" title="Sea shore flag">X</span></td>
<td class="bits" rowspan=4><span class="free">OOOO OOOO</span></td>
<td class="bits" rowspan=4><span class="free">OOOO OOOO</td>
<td class="bits" rowspan=4><span class="free">OOOO OOOO OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">canal, river</td>
<td class="bits"><span class="used" title="Canal/river random bits">XXXX XXXX</span></td>
<td class="bits"><span class="used" title="Water tile type: coast, clear, lock, depot">O<span class="usable">OO</span>O</span> <span class="free">OOOO</span></td>
</tr>
<tr>
<td class="caption">lock</td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="used" title="Water tile type: coast, clear, lock, depot">O<span class="usable">OO</span>1</span> <span class="used" title="Lock part">XX</span> <span class="used" title="Lock orientation m5[1..0]">XX</span></td>
</tr>
<tr>
<td class="caption">shipdepot</td>
<td class="bits"><span class="pool" title="Depot index on pool">XXXX XXXX XXXX XXXX</span></td>
<td class="bits"><span class="free">OOOO OOOO</span></td>
<td class="bits"><span class="used" title="Water tile type: coast, clear, lock, depot">1<span class="usable">OOO</span></span> <span class="free">OO</span><span class="used" title="Depot axis">X</span> <span class="used" title="Depot part">X</span></td>
</tr>
<tr>
<td rowspan=2>8</td>
<td class="caption">finished industry</td>
<td class="bits"><span class="used" title="Completed industry">1</span> <span class="used" title="Water class">XX</span><span class="free">O</span> <span class="free">OOOO</span></td>
<td class="bits" rowspan=2><span class="pool" title="Industry index on pool">XXXX XXXX XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="used" title="Random bits">XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="used" title="Animation loop">XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="used" title="Industry graphics ID (m5 + m6[2])">XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="free">OO</span><span class="used" title="Random triggers (NewGRF)">XXX</span> <span class="used" title="Industry graphics ID (m5 + m6[2])">X</span><span class="free">OO</span></td>
<td class="bits" rowspan=2><span class="used" title="Animation frame">XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="free">OOOO OOOO OOOO OOOO</span></td>
</tr>
<tr>
<td class="caption">industry under construction</td>
<td class="bits"><span class="used" title="Completed industry">O</span> <span class="used" title="Water class">XX</span><span class="free">O</span> <span class="used" title="If under construction, construction counter and stage of construction">XXXX</span></td>
</tr>
<tr>
<td rowspan=4>9</td>
<td class="caption">tunnel entrance</td>
<td class="bits" rowspan=3><span class="free">OOO</span> <span class="used" title="Owner">XXXXX</span></td>
<td class="bits"><span class="patch-pool" title="Tunnel index on pool (or overflow sentinel)">PPPP PPPP PPPP PPPP</span></td>
<td class="bits" rowspan=4><span class="rearrange" title="Owner of tram (road only; a rearrangement can free some of these bits)">XXXX</span> <span class="free">OOOO</span><br /><span class="patch" title="New signal style is non-zero (rail only)">P</span> <span class="patch" title="Routing restrictions present on entrance/exit signal(s)">P</span> <span class="patch" title="Entrance/exit signal aspects (rail only)">PPPPPP</span></td>
<td class="bits"><span class="free">OO</span><span class="used" title="Road type">XX XXXX</span></td>
<td class="bits"><span class="used" title="Bridge or tunnel bit">O</span><span class="patch" title="Signal simulation mode (rail only)">PP</span><span class="rearrange" title="PBS reservation (rail; a rearrangement can free some of these bits)">X</span> <span class="used" title="Transport type">XX</span> <span class="used" title="Direction of the tunnel/bridge">XX</span></td>
<td class="bits"><span class="patch" title="PBS mode, exit signal state">PP</span><span class="free">OO OO</span><span class="patch" title="Semaphore/light mode, entrance signal state">PP</span></td>
<td class="bits" rowspan=4><span class="patch" title="Snow/desert present or rail custom bridge head ground type">PPP</span><span class="rearrange" title="Owner of road (road only; a rearrangement can free some of these bits)">X XXXX</span></td>
<td class="bits"><span class="patch" title="Road cached one way state (road only) or signal simulation spacing (rail only)">PPPP</span> <span class="used" title="Tram type">XXXX XX</span><span class="rearrange" title="Railway type (rail only; a rearrangement can free some of these bits)">XX XXXX</span></td>
</tr>
<tr>
<td>bridge ramp - rail</td>
<td class="bits"><span class="patch" title="Bridge middle signal states">PPPP PPPP PPPP</span> <span class="patch" title="Reserved tracks">PPPP</span></td>
<td class="bits"><span class="free">OO</span><span class="patch" title="Track pieces">PP PPPP</span></td>
<td class="bits"><span class="used" title="Bridge or tunnel bit">1</span><span class="patch" title="Signal simulation mode">PP</span><span class="free">O</span> <span class="used" title="Transport type">00</span> <span class="used" title="Direction of the tunnel/bridge">XX</span></td>
<td class="bits"><span class="patch" title="PBS mode, exit signal state">PP</span><span class="used" title="Bridge type: wooden, steel,...">XX XX</span><span class="patch" title="Semaphore/light mode, entrance signal state">PP</span></td>
<td class="bits"><span class="patch" title="Signal simulation spacing">PPPP</span> <span class="patch" title="Secondary railway type (used for bridge-bypassing track when two parallel tracks on custom bridge head)">PPPP PP</span><span class="rearrange" title="Railway type (a rearrangement can free some of these bits)">XX XXXX</span></td>
</tr>
<tr>
<td>bridge ramp - road</td>
<td class="bits"><span class="free">OOOO OOOO</span> <span class="patch" title="Custom bridge head road piece difference">PPPP</span> <span class="patch" title="Custom bridge head tram piece difference">PPPP</span></td>
<td class="bits"><span class="free">OO</span><span class="used" title="Road type">XX XXXX</span></td>
<td class="bits"><span class="used" title="Bridge or tunnel bit">1</span><span class="free">OOO</span> <span class="used" title="Transport type">01</span> <span class="used" title="Direction of the tunnel/bridge">XX</span></td>
<td class="bits" rowspan=2><span class="free">OO</span><span class="used" title="Bridge type: wooden, steel,...">XX XX</span><span class="free">OO</span></td>
<td class="bits"><span class="free">O</span><span class="patch" title="Road cached one way state">PPP</span> <span class="used" title="Tram type">XXXX XX</span><span class="free">OO OOOO</span></td>
</tr>
<tr>
<td>bridge ramp - water</td>
<td class="bits"><span class="used" title="Ship docking tile status (for aqueducts)">X</span><span class="free">OO</span> <span class="used" title="Owner">XXXXX</span></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="used" title="Bridge or tunnel bit">1</span><span class="free">OOO</span> <span class="used" title="Transport type">10</span> <span class="used" title="Direction of the tunnel/bridge">XX</span></td>
<td class="bits"><span class="free">OOOO OOOO OOOO OOOO</span></td>
</tr>
<tr>
<td>A</td>
<td class="caption">objects</td>
<td class="bits"><span class="free">O</span><span class="used" title="Water class">XX</span> <span class="used" title="Owner">XXXXX</span></td>
<td class="bits"><span class="pool" title="Object index on pool (m2 + m5)">XXXX XXXX XXXX XXXX</span></td>
<td class="bits"><span class="used" title="Random bits">XXXX XXXX</span></td>
<td class="bits"><span class="patch" title="Ground update counter">PPP</span> <span class="patch" title="Viewport map override">P</span> <span class="patch" title="Ground type: grass/bare, snow/desert, shore">PP</span> <span class="patch" title="Ground density">PP</span></td>
<td class="bits"><span class="pool" title="Object index on pool (m2 + m5)">XXXX XXXX</span></td>
<td class="bits"><span class="free">OOOO OO</span><span class="patch" title="Foundation type">PP</span> </td>
<td class="bits"><span class="used" title="Animation counter">XXXX XXXX</span></td>
<td class="bits" rowspan=1><span class="free">OOOO OOOO OOOO OOOO</span></td>
</tr>
<tr>
<td colspan=2 class="caption">bits</td>
<td class="bits">7654 3210</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>
<td class="bits">FEDC BA98 7654 3210</td>
</tr>
<tr>
<th colspan=2>class</th>
<th>type (8)</th>
<th>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>
<th>m8 (16)</th>
</tr>
</tbody>
</table>
</body>
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