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annotate src/rail.h @ 8123:c26c28875749 draft

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(svn r11684) -Codechange: split gfx.h in a type and functional header.
author rubidium <rubidium@openttd.org>
date Sun, 23 Dec 2007 10:56:02 +0000
parents 89722abcfd91
children 60ea0f95de91
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1 /* $Id$ */
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2
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3 /** @file rail.h */
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4
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5 #ifndef RAIL_H
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6 #define RAIL_H
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7
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8 #include "rail_type.h"
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9 #include "track_type.h"
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10 #include "vehicle_type.h"
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11 #include "gfx_type.h"
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12 #include "core/bitmath_func.hpp"
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13 #include "economy_func.h"
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14 #include "variables.h"
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15
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16 /** This struct contains all the info that is needed to draw and construct tracks.
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17 */
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18 struct RailtypeInfo {
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19 /** Struct containing the main sprites. @note not all sprites are listed, but only
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20 * the ones used directly in the code */
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21 struct {
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22 SpriteID track_y; ///< single piece of rail in Y direction, with ground
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23 SpriteID track_ns; ///< two pieces of rail in North and South corner (East-West direction)
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24 SpriteID ground; ///< ground sprite for a 3-way switch
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25 SpriteID single_y; ///< single piece of rail in Y direction, without ground
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26 SpriteID single_x; ///< single piece of rail in X direction
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27 SpriteID single_n; ///< single piece of rail in the northern corner
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28 SpriteID single_s; ///< single piece of rail in the southern corner
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29 SpriteID single_e; ///< single piece of rail in the eastern corner
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30 SpriteID single_w; ///< single piece of rail in the western corner
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31 SpriteID crossing; ///< level crossing, rail in X direction
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32 SpriteID tunnel; ///< tunnel sprites base
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33 } base_sprites;
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34
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35 /** struct containing the sprites for the rail GUI. @note only sprites referred to
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36 * directly in the code are listed */
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37 struct {
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38 SpriteID build_ns_rail; ///< button for building single rail in N-S direction
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39 SpriteID build_x_rail; ///< button for building single rail in X direction
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40 SpriteID build_ew_rail; ///< button for building single rail in E-W direction
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41 SpriteID build_y_rail; ///< button for building single rail in Y direction
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42 SpriteID auto_rail; ///< button for the autorail construction
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43 SpriteID build_depot; ///< button for building depots
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44 SpriteID build_tunnel; ///< button for building a tunnel
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45 SpriteID convert_rail; ///< button for converting rail
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46 } gui_sprites;
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47
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48 struct {
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49 CursorID rail_ns; ///< Cursor for building rail in N-S direction
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50 CursorID rail_swne; ///< Cursor for building rail in X direction
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51 CursorID rail_ew; ///< Cursor for building rail in E-W direction
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52 CursorID rail_nwse; ///< Cursor for building rail in Y direction
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53 CursorID autorail; ///< Cursor for autorail tool
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54 CursorID depot; ///< Cursor for building a depot
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55 CursorID tunnel; ///< Cursor for building a tunnel
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56 CursorID convert; ///< Cursor for converting track
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57 } cursor;
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58
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59 struct {
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60 StringID toolbar_caption;
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61 } strings;
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62
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63 /** sprite number difference between a piece of track on a snowy ground and the corresponding one on normal ground */
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64 SpriteID snow_offset;
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65
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66 /** bitmask to the OTHER railtypes on which an engine of THIS railtype generates power */
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67 RailTypeMask powered_railtypes;
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68
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69 /** bitmask to the OTHER railtypes on which an engine of THIS railtype can physically travel */
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70 RailTypeMask compatible_railtypes;
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71
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72 /**
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73 * Offset between the current railtype and normal rail. This means that:<p>
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74 * 1) All the sprites in a railset MUST be in the same order. This order
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75 * is determined by normal rail. Check sprites 1005 and following for this order<p>
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76 * 2) The position where the railtype is loaded must always be the same, otherwise
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77 * the offset will fail.
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78 * @note: Something more flexible might be desirable in the future.
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79 */
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80 SpriteID total_offset;
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81
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82 /**
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83 * Bridge offset
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84 */
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85 SpriteID bridge_offset;
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86
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87 /**
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88 * Offset to add to ground sprite when drawing custom waypoints / stations
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89 */
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90 byte custom_ground_offset;
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91 };
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92
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93
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94 /** these are the maximums used for updating signal blocks, and checking if a depot is in a pbs block */
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95 enum {
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96 NUM_SSD_ENTRY = 256, ///< max amount of blocks
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97 NUM_SSD_STACK = 32, ///< max amount of blocks to check recursively
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98 };
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99
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100 /*
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101 * Functions to map tracks to the corresponding bits in the signal
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102 * presence/status bytes in the map. You should not use these directly, but
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103 * wrapper functions below instead. XXX: Which are these?
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104 */
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105
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106 /**
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107 * Maps a trackdir to the bit that stores its status in the map arrays, in the
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108 * direction along with the trackdir.
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109 */
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110 static inline byte SignalAlongTrackdir(Trackdir trackdir)
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111 {
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112 extern const byte _signal_along_trackdir[TRACKDIR_END];
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113 return _signal_along_trackdir[trackdir];
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114 }
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115
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116 /**
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117 * Maps a trackdir to the bit that stores its status in the map arrays, in the
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118 * direction against the trackdir.
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119 */
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120 static inline byte SignalAgainstTrackdir(Trackdir trackdir)
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121 {
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122 extern const byte _signal_against_trackdir[TRACKDIR_END];
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123 return _signal_against_trackdir[trackdir];
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124 }
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125
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126 /**
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127 * Maps a Track to the bits that store the status of the two signals that can
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128 * be present on the given track.
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129 */
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130 static inline byte SignalOnTrack(Track track)
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131 {
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132 extern const byte _signal_on_track[TRACK_END];
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133 return _signal_on_track[track];
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134 }
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135
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136
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137
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138 /**
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139 * Returns a pointer to the Railtype information for a given railtype
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140 * @param railtype the rail type which the information is requested for
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141 * @return The pointer to the RailtypeInfo
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142 */
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143 static inline const RailtypeInfo *GetRailTypeInfo(RailType railtype)
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144 {
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145 extern RailtypeInfo _railtypes[RAILTYPE_END];
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146 assert(railtype < RAILTYPE_END);
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147 return &_railtypes[railtype];
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148 }
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149
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150 /**
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151 * Checks if an engine of the given RailType can drive on a tile with a given
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152 * RailType. This would normally just be an equality check, but for electric
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153 * rails (which also support non-electric engines).
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154 * @return Whether the engine can drive on this tile.
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155 * @param enginetype The RailType of the engine we are considering.
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156 * @param tiletype The RailType of the tile we are considering.
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157 */
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158 static inline bool IsCompatibleRail(RailType enginetype, RailType tiletype)
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159 {
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160 return HasBit(GetRailTypeInfo(enginetype)->compatible_railtypes, tiletype);
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161 }
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162
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163 /**
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164 * Checks if an engine of the given RailType got power on a tile with a given
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165 * RailType. This would normally just be an equality check, but for electric
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166 * rails (which also support non-electric engines).
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167 * @return Whether the engine got power on this tile.
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168 * @param enginetype The RailType of the engine we are considering.
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169 * @param tiletype The RailType of the tile we are considering.
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170 */
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171 static inline bool HasPowerOnRail(RailType enginetype, RailType tiletype)
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172 {
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173 return HasBit(GetRailTypeInfo(enginetype)->powered_railtypes, tiletype);
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174 }
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175
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176
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177 extern int _railtype_cost_multiplier[RAILTYPE_END];
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178 extern const int _default_railtype_cost_multiplier[RAILTYPE_END];
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179
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180 /**
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181 * Returns the cost of building the specified railtype.
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182 * @param railtype The railtype being built.
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183 * @return The cost multiplier.
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184 */
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185 static inline Money RailBuildCost(RailType railtype)
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186 {
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187 assert(railtype < RAILTYPE_END);
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188 return (_price.build_rail * _railtype_cost_multiplier[railtype]) >> 3;
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189 }
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190
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191 /**
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192 * Calculates the cost of rail conversion
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193 * @param from The railtype we are converting from
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194 * @param to The railtype we are converting to
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195 * @return Cost per TrackBit
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196 */
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197 static inline Money RailConvertCost(RailType from, RailType to)
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198 {
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199 /* rail -> el. rail
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200 * calculate the price as 5 / 4 of (cost build el. rail) - (cost build rail)
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201 * (the price of workers to get to place is that 1/4)
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202 */
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203 if (HasPowerOnRail(from, to)) {
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204 return ((RailBuildCost(to) - RailBuildCost(from)) * 5) >> 2;
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205 }
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206
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207 /* el. rail -> rail
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208 * calculate the price as 1 / 4 of (cost build el. rail) - (cost build rail)
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209 * (the price of workers is 1 / 4 + price of copper sold to a recycle center)
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210 */
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211 if (HasPowerOnRail(to, from)) {
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212 return (RailBuildCost(from) - RailBuildCost(to)) >> 2;
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213 }
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214
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215 /* make the price the same as remove + build new type */
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216 return RailBuildCost(to) + _price.remove_rail;
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217 }
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218
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219 void *UpdateTrainPowerProc(Vehicle *v, void *data);
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220 void DrawTrainDepotSprite(int x, int y, int image, RailType railtype);
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221 void DrawDefaultWaypointSprite(int x, int y, RailType railtype);
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222
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223 /**
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224 * Draws overhead wires and pylons for electric railways.
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225 * @param ti The TileInfo struct of the tile being drawn
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226 * @see DrawCatenaryRailway
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227 */
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228 void DrawCatenary(const TileInfo *ti);
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229 void DrawCatenaryOnTunnel(const TileInfo *ti);
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230
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231 Foundation GetRailFoundation(Slope tileh, TrackBits bits);
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232
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233 int32 SettingsDisableElrail(int32 p1); ///< _patches.disable_elrail callback
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234
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235 #endif /* RAIL_H */