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annotate src/newgrf_generic.cpp @ 10480:649ba332458f draft

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(svn r14735) -Codechange: remove a bit of bit-waste in the map array (without changing the map array) and make the CompanyIDs contiguous. -Note: 15 should be enough for now... making it any more means adding more bytes to the map array and thus wasting more bits instead of reducing the bit waste.
author rubidium <rubidium@openttd.org>
date Wed, 24 Dec 2008 09:53:15 +0000
parents 0654bf387d06
children a4e5b5d2837c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* $Id$ */
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2
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3 /** @file newgrf_generic.cpp Handling of generic feature callbacks. */
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5 #include "stdafx.h"
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6 #include "openttd.h"
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7 #include "variables.h"
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8 #include "landscape.h"
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9 #include "debug.h"
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10 #include "newgrf.h"
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11 #include "newgrf_callbacks.h"
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12 #include "newgrf_commons.h"
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13 #include "newgrf_spritegroup.h"
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14 #include "newgrf_generic.h"
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15 #include "tile_map.h"
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16 #include <list>
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19 struct GenericCallback {
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20 const GRFFile *file;
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21 const SpriteGroup *group;
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23 GenericCallback(const GRFFile *file, const SpriteGroup *group) :
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24 file(file),
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25 group(group)
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26 { }
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27 };
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29 typedef std::list<GenericCallback> GenericCallbackList;
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31 static GenericCallbackList _gcl[GSF_END];
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33
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34 /**
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35 * Reset all generic feature callback sprite groups.
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36 */
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37 void ResetGenericCallbacks()
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38 {
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39 for (uint8 feature = 0; feature < lengthof(_gcl); feature++) {
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40 _gcl[feature].clear();
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41 }
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42 }
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43
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45 /**
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46 * Add a generic feature callback sprite group to the appropriate feature list.
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47 * @param feature
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48 * @param file
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49 * @param group
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50 */
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51 void AddGenericCallback(uint8 feature, const GRFFile *file, const SpriteGroup *group)
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52 {
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53 if (feature >= lengthof(_gcl)) {
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54 grfmsg(5, "AddGenericCallback: Unsupported feature 0x%02X", feature);
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55 return;
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56 }
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57
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58 /* Generic feature callbacks are evaluated in reverse (i.e. the last group
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59 * to be added is evaluated first, etc) thus we push the group to the
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60 * beginning of the list so a standard iterator will do the right thing. */
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61 _gcl[feature].push_front(GenericCallback(file, group));
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62 }
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64
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65 static uint32 GenericCallbackGetRandomBits(const ResolverObject *object)
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66 {
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67 return 0;
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68 }
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71 static uint32 GenericCallbackGetTriggers(const ResolverObject *object)
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72 {
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73 return 0;
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74 }
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77 static void GenericCallbackSetTriggers(const ResolverObject *object, int triggers)
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78 {
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79 return;
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80 }
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83 static uint32 GenericCallbackGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
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84 {
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85 switch (variable) {
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86 case 0x40: return object->u.generic.cargo_type;
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87
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88 case 0x80: return object->u.generic.cargo_type;
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89 case 0x81: return object->u.generic.cargo_type;
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90 case 0x82: return object->u.generic.default_selection;
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91 case 0x83: return object->u.generic.src_industry;
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92 case 0x84: return object->u.generic.dst_industry;
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93 case 0x85: return object->u.generic.distance;
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94 case 0x86: return object->u.generic.event;
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95 case 0x87: return object->u.generic.count;
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96 case 0x88: return object->u.generic.station_size;
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97
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98 default: break;
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99 }
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101 DEBUG(grf, 1, "Unhandled generic feature property 0x%02X", variable);
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102
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103 *available = false;
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104 return 0;
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105 }
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107
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108 static const SpriteGroup *GenericCallbackResolveReal(const ResolverObject *object, const SpriteGroup *group)
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109 {
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110 if (group->g.real.num_loaded == 0) return NULL;
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111
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112 return group->g.real.loaded[0];
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113 }
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114
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115
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116 static inline void NewGenericResolver(ResolverObject *res, const GRFFile *grffile)
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117 {
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118 res->GetRandomBits = &GenericCallbackGetRandomBits;
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119 res->GetTriggers = &GenericCallbackGetTriggers;
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120 res->SetTriggers = &GenericCallbackSetTriggers;
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121 res->GetVariable = &GenericCallbackGetVariable;
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122 res->ResolveReal = &GenericCallbackResolveReal;
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123
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124 res->callback = CBID_NO_CALLBACK;
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125 res->callback_param1 = 0;
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126 res->callback_param2 = 0;
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127 res->last_value = 0;
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128 res->trigger = 0;
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129 res->reseed = 0;
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130 res->count = 0;
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131 res->grffile = grffile;
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132 }
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133
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134
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135 /** Follow a generic feature callback list and return the first successful
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136 * answer
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137 * @param feature GRF Feature of callback
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138 * @param object pre-populated resolver object
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139 * @param file address of GRFFile object if file reference is needed, NULL is valid
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140 * @return callback value if successful or CALLBACK_FAILED
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141 */
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142 static uint16 GetGenericCallbackResult(uint8 feature, ResolverObject *object, const GRFFile **file)
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143 {
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144 assert(feature < lengthof(_gcl));
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145
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146 /* Test each feature callback sprite group. */
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147 for (GenericCallbackList::const_iterator it = _gcl[feature].begin(); it != _gcl[feature].end(); ++it) {
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148 const SpriteGroup *group = it->group;
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149 group = Resolve(group, object);
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150 if (group == NULL || group->type != SGT_CALLBACK) continue;
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151
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152 /* Return NewGRF file if necessary */
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153 if (file != NULL) *file = it->file;
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154
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155 return group->g.callback.result;
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156 }
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157
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158 /* No callback returned a valid result, so we've failed. */
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159 return CALLBACK_FAILED;
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160 }
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161
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162
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163 /**
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164 * 'Execute' an AI purchase selection callback
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165 */
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166 uint16 GetAiPurchaseCallbackResult(uint8 feature, CargoID cargo_type, uint8 default_selection, IndustryType src_industry, IndustryType dst_industry, uint8 distance, AIConstructionEvent event, uint8 count, uint8 station_size, const GRFFile **file)
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167 {
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168 ResolverObject object;
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169
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170 NewGenericResolver(&object, *file);
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171
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172 object.callback = CBID_GENERIC_AI_PURCHASE_SELECTION;
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173 object.u.generic.cargo_type = cargo_type;
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174 object.u.generic.default_selection = default_selection;
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175 object.u.generic.src_industry = src_industry;
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176 object.u.generic.dst_industry = dst_industry;
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177 object.u.generic.distance = distance;
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178 object.u.generic.event = event;
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179 object.u.generic.count = count;
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180 object.u.generic.station_size = station_size;
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181
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182 uint16 callback = GetGenericCallbackResult(feature, &object, file);
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183 if (callback != CALLBACK_FAILED) callback = GB(callback, 0, 8);
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184 return callback;
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185 }