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annotate src/newgrf_generic.cpp @ 8544:50768dea0a8b draft

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(svn r12122) -Codechange: Add framework for generic feature callbacks, along with some parts for AI use.
author peter1138 <peter1138@openttd.org>
date Tue, 12 Feb 2008 13:23:57 +0000
parents
children ae0ec91bb55e
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8544
50768dea0a8b (svn r12122) -Codechange: Add framework for generic feature callbacks, along with some parts for AI use.
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1 /* $Id$ */
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2
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3 #include "stdafx.h"
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4 #include "openttd.h"
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5 #include "variables.h"
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6 #include "landscape.h"
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7 #include "debug.h"
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8 #include "newgrf.h"
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9 #include "newgrf_callbacks.h"
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10 #include "newgrf_commons.h"
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11 #include "newgrf_spritegroup.h"
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12 #include "newgrf_generic.h"
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13 #include "tile_map.h"
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14 #include <list>
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15
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16
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17 struct GenericCallback {
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18 const GRFFile *file;
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19 const SpriteGroup *group;
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20
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21 GenericCallback(const GRFFile *file, const SpriteGroup *group) :
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22 file(file),
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23 group(group)
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24 { }
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25 };
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26
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27 typedef std::list<GenericCallback> GenericCallbackList;
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29 static GenericCallbackList _gcl[GSF_END];
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30
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31
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32 /**
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33 * Reset all generic feature callback sprite groups.
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34 */
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35 void ResetGenericCallbacks()
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36 {
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37 for (uint8 feature = 0; feature < lengthof(_gcl); feature++) {
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38 _gcl[feature].clear();
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39 }
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40 }
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41
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42
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43 /**
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44 * Add a generic feature callback sprite group to the appropriate feature list.
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45 * @param feature
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46 * @param file
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47 * @param group
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48 */
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49 void AddGenericCallback(uint8 feature, const GRFFile *file, const SpriteGroup *group)
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50 {
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51 if (feature >= lengthof(_gcl)) {
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52 grfmsg(5, "AddGenericCallback: Unsupported feature 0x%02X", feature);
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53 return;
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54 }
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55
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56 /* Generic feature callbacks are evaluated in reverse (i.e. the last group
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57 * to be added is evaluated first, etc) thus we push the group to the
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58 * beginning of the list so a standard iterator will do the right thing. */
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59 _gcl[feature].push_front(GenericCallback(file, group));
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60 }
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61
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62
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63 static uint32 GenericCallbackGetRandomBits(const ResolverObject *object)
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64 {
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65 return 0;
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66 }
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67
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68
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69 static uint32 GenericCallbackGetTriggers(const ResolverObject *object)
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70 {
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71 return 0;
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72 }
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73
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74
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75 static void GenericCallbackSetTriggers(const ResolverObject *object, int triggers)
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76 {
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77 return;
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78 }
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79
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80
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81 static uint32 GenericCallbackGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
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82 {
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83 switch (variable) {
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84 case 0x40: return object->u.generic.cargo_type;
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85
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86 case 0x80: return object->u.generic.cargo_type;
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87 case 0x81: return object->u.generic.cargo_type;
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88 case 0x82: return object->u.generic.default_selection;
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89 case 0x83: return object->u.generic.src_industry;
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90 case 0x84: return object->u.generic.dst_industry;
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91 case 0x85: return object->u.generic.distance;
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92 case 0x86: return object->u.generic.event;
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93 case 0x87: return object->u.generic.count;
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94 case 0x88: return object->u.generic.station_size;
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95
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96 default: break;
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97 }
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98
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99 DEBUG(grf, 1, "Unhandled generic feature property 0x%02X", variable);
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100
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101 *available = false;
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102 return 0;
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103 }
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104
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105
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106 static const SpriteGroup *GenericCallbackResolveReal(const ResolverObject *object, const SpriteGroup *group)
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107 {
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108 if (group->g.real.num_loaded == 0) return NULL;
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109
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110 return group->g.real.loaded[0];
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111 }
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112
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113
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114 static inline void NewGenericResolver(ResolverObject *res)
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115 {
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116 res->GetRandomBits = &GenericCallbackGetRandomBits;
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117 res->GetTriggers = &GenericCallbackGetTriggers;
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118 res->SetTriggers = &GenericCallbackSetTriggers;
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119 res->GetVariable = &GenericCallbackGetVariable;
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120 res->ResolveReal = &GenericCallbackResolveReal;
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121
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122 res->callback = CBID_NO_CALLBACK;
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123 res->callback_param1 = 0;
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124 res->callback_param2 = 0;
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125 res->last_value = 0;
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126 res->trigger = 0;
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127 res->reseed = 0;
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128 }
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129
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130
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131 /** Follow a generic feature callback list and return the first successful
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132 * answer
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133 * @param feature GRF Feature of callback
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134 * @param object pre-populated resolver object
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135 * @param file address of GRFFile object if file reference is needed, NULL is valid
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136 * @return callback value if successful or CALLBACK_FAILED
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137 */
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138 static uint16 GetGenericCallbackResult(uint8 feature, ResolverObject *object, const GRFFile **file)
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139 {
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140 assert(feature < lengthof(_gcl));
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141
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142 /* Test each feature callback sprite group. */
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143 for (GenericCallbackList::const_iterator it = _gcl[feature].begin(); it != _gcl[feature].end(); ++it) {
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144 const SpriteGroup *group = it->group;
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145 group = Resolve(group, object);
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146 if (group == NULL || group->type != SGT_CALLBACK) continue;
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147
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148 /* Return NewGRF file if necessary */
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149 if (file != NULL) *file = it->file;
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150
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151 return group->g.callback.result;
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152 }
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153
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154 /* No callback returned a valid result, so we've failed. */
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155 return CALLBACK_FAILED;
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156 }
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157
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158
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159 /**
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160 * 'Execute' an AI purchase selection callback
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161 */
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162 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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163 {
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164 ResolverObject object;
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165
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166 NewGenericResolver(&object);
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167
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168 object.callback = CBID_GENERIC_AI_PURCHASE_SELECTION;
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169 object.u.generic.cargo_type = cargo_type;
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170 object.u.generic.default_selection = default_selection;
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171 object.u.generic.src_industry = src_industry;
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172 object.u.generic.dst_industry = dst_industry;
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173 object.u.generic.distance = distance;
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174 object.u.generic.event = event;
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175 object.u.generic.count = count;
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176 object.u.generic.station_size = station_size;
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177
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178 return GetGenericCallbackResult(feature, &object, file);
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179 }