1 | /*==========================================================================
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2 | * (C) 2006 Universitat Jaume I
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3 | *==========================================================================
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4 | * PROYECT: GAME TOOLS
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5 | *==========================================================================
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6 | * CONTENT:
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7 | *
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8 | *
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9 | * @file GeoLodManager.cpp
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10 | *===========================================================================*/
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11 |
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12 | #include "GeoLodManager.h"
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13 | #include "GeoLodObject.h"
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14 | #include "VertexData.h"
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15 | #include <ntls.h>
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16 | #include <map>
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17 |
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18 | using namespace Geometry;
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19 |
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20 | //#define MINIMUM_VALID_LOD_SIMILARITY 0.1f
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21 |
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22 | namespace Geometry
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23 | {
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24 | class lodobj_node_t : public Moveable<lodobj_node_t>
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25 | {
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26 | public:
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27 | lodobj_node_t(const std::string &nam, float dist, LodObject *o):dist2cam(dist),lodobj(o),name(nam){ must_recalculate_distance=false; to_update=0; master=NULL; lodfactor=o->GetCurrentLodFactor(); precalpos=-1; }
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28 | lodobj_node_t(const lodobj_node_t &n){ operator=(n); }
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29 | float dist2cam;
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30 | LodObject *lodobj;
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31 | bool must_recalculate_distance;
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32 | uint32 to_update;
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33 | bool operator < (const lodobj_node_t &o) const { return (dist2cam < o.dist2cam); }
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34 | void operator = (const lodobj_node_t &n){ dist2cam=n.dist2cam; lodobj=n.lodobj; must_recalculate_distance=n.must_recalculate_distance; master=n.master; lodfactor=n.lodfactor; precalpos=-1; name=n.name; }
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35 |
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36 | lodobj_node_t * master;
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37 | VectorMap<uint32,lodobj_node_t*> disciples;
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38 | float lodfactor; // virtual lod factor (the lodfactor it seems, not its real internal lodfactor)
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39 | int precalpos;
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40 | std::string name;
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41 | };
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42 |
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43 | class NodeContainer
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44 | {
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45 | public:
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46 | Vector<lodobj_node_t> lodobj_dists;
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47 | std::map<uint32,Geometry::Vector3> lodobj_pos; // map key: LodObject UniqueID for efficient ID-based finding
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48 | Vector3 camera_pos;
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49 |
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50 | int num_lod_sim;
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51 |
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52 | NodeContainer(const Geometry::Vector3 &campos)
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53 | :camera_pos(campos){
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54 | }
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55 |
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56 | ~NodeContainer(void){
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57 | for (VectorMap<std::string,lodobj_node_t**>::Iterator it = precalculated_lods.Begin();
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58 | it != precalculated_lods.End(); it ++)
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59 | {
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60 | lodobj_node_t **nodes = *it;
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61 | delete[] nodes;
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62 | }
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63 | }
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64 |
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65 | void RecalculateDist(lodobj_node_t & node){
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66 | std::map<uint32,Vector3>::iterator posit = lodobj_pos.find(node.lodobj->GetUniqueID());
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67 | assert(posit!=lodobj_pos.end());
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68 | const Vector3 & pos = posit->second;
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69 |
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70 | node.dist2cam = CalculateDistToCamera(pos);
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71 | }
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72 |
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73 | float CalculateDistToCamera(const Geometry::Vector3 &p) const
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74 | {
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75 | Geometry::Vector3 v = camera_pos - p;
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76 | float distquad = v.length();
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77 | return distquad;
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78 | }
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79 |
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80 | lodobj_node_t * & GetPrecalculatedLOD(const std::string &name, int ipos){
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81 | int foundpos = precalculated_lods.Find(name);
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82 | if (foundpos==-1)
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83 | {
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84 | lodobj_node_t **new_precalculated_lods=new lodobj_node_t*[num_lod_sim+1]; // +1 is done to include the highest lod (1.0)
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85 | for (int i=0; i<num_lod_sim+1; i++)
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86 | new_precalculated_lods[i]=NULL;
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87 | precalculated_lods.Add(name) = new_precalculated_lods;
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88 | return new_precalculated_lods[ipos];
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89 | }
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90 | else
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91 | {
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92 | return precalculated_lods[foundpos][ipos];
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93 | }
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94 | }
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95 |
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96 | uint32 lod2precalpos(Real lodfactor){
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97 | return (uint32)(num_lod_sim*lodfactor);
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98 | }
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99 |
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100 | private:
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101 | // the following is an array of precalculated lods
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102 | // for 10 precalculated lods each element is in order [0.1, 0.2, 0.3, 0.4, 0.5, ...]
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103 | // for 100 precalculated lods each element is in order [0.01, 0.02, 0.03, 0.04, 0.05, ...]
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104 | // the funcion lod2precalpos translates a LOD factor to a position in the array
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105 | VectorMap<std::string,lodobj_node_t**> precalculated_lods;
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106 |
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107 | };
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108 | }
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109 |
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110 | LodManager::LodManager(Real near, Real far, const Geometry::Vector3 &campos, int numslots)
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111 | :lasttime(0),camera_changed(true),node_added(false),
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112 | near_range(near),far_range(far),
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113 | always_calculate_lod(false),force_highest_lod(false)
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114 | {
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115 | lodobj_container=new NodeContainer(campos);
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116 | lodobj_container->num_lod_sim = numslots;
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117 | }
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118 |
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119 | LodManager::~LodManager(void)
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120 | {
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121 | delete lodobj_container;
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122 | // delete[] precalculated_lods;
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123 | }
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124 |
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125 | void Geometry::LodManager::AddLodObj(const std::string &name, LodObject * o, const Geometry::Vector3 &p)
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126 | {
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127 | float dist = lodobj_container->CalculateDistToCamera(p);
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128 | lodobj_node_t auxnode(name,dist,o);
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129 |
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130 | lodobj_container->lodobj_dists.Add(auxnode);
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131 | Sort(lodobj_container->lodobj_dists);
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132 |
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133 | UpdateLODObjectPos(o,p);
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134 | node_added=true;
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135 | }
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136 |
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137 |
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138 | void Geometry::LodManager::UpdateLOD(void)
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139 | {
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140 | if (!lodobj_container->lodobj_dists.IsEmpty())
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141 | {
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142 | // update distances to the camera
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143 | if (camera_changed || node_added)
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144 | {
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145 | bool must_resort = false;
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146 | for (Vector<lodobj_node_t>::Iterator it=lodobj_container->lodobj_dists.Begin();
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147 | it!=lodobj_container->lodobj_dists.End();
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148 | it++)
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149 | {
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150 | lodobj_node_t & node = *it;
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151 | if (node.must_recalculate_distance || camera_changed || node_added)
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152 | {
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153 | lodobj_container->RecalculateDist(node);
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154 | must_resort=true;
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155 | }
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156 | }
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157 | /* if (must_resort)
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158 | Sort(lodobj_container->lodobj_dists);*/
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159 | }
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160 |
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161 | // the end of the list is the greater element (greater dist)
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162 | /* if (currFPS < targetFPS - 5)
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163 | {
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164 | Vector<lodobj_node_t>::Iterator selnode;
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165 | for (selnode=lodobj_container->lodobj_dists.End()-1; selnode!=lodobj_container->lodobj_dists.Begin()-1; selnode--)
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166 | {
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167 | // NO HAY QUE USAR CURRENT LOD FACTOR SINO lodobj_container->lodobj_lodfactor
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168 | if (selnode->lodobj->GetCurrentLodFactor()>0.00001f)
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169 | {
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170 | if (selnode->to_update==0)
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171 | break;
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172 | else
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173 | selnode->to_update--;
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174 | }
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175 | }
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176 |
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177 | if (selnode!=lodobj_container->lodobj_dists.Begin()-1)
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178 | {
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179 | // EL DECREMENTO O EL NUMERO DE DECREMENTOS TIENE QUE VENIR EN FUNCION DE LA DIFERENCIA DE FPS
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180 | // NO HAY QUE USAR CURRENT LOD FACTOR SINO lodobj_container->lodobj_lodfactor
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181 | selnode->lodobj->GoToLod(selnode->lodobj->GetCurrentLodFactor()-0.02f);
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182 | selnode->to_update=10; // ESTO DEBE ASIGNARSE BASADO EN LA DISTANCIA A LA CAMARA!
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183 | }
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184 | }
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185 | if (currFPS > targetFPS + 5)
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186 | {
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187 | Vector<lodobj_node_t>::Iterator selnode;
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188 | for (selnode=lodobj_container->lodobj_dists.Begin(); selnode!=lodobj_container->lodobj_dists.End(); selnode++)
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189 | {
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190 | // NO HAY QUE USAR CURRENT LOD FACTOR SINO lodobj_container->lodobj_lodfactor
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191 | if (selnode->lodobj->GetCurrentLodFactor()<0.99999f)
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192 | {
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193 | if (selnode->to_update==0)
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194 | break;
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195 | else
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196 | selnode->to_update--;
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197 | }
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198 | }
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199 |
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200 | if (selnode!=lodobj_container->lodobj_dists.End())
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201 | {
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202 | // NO HAY QUE USAR CURRENT LOD FACTOR SINO lodobj_container->lodobj_lodfactor
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203 | selnode->lodobj->GoToLod(selnode->lodobj->GetCurrentLodFactor()+0.02f);
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204 | selnode->to_update=10; // ESTO DEBE ASIGNARSE BASADO EN LA DISTANCIA A LA CAMARA!
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205 | }
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206 | }*/
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207 |
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208 | if (camera_changed)
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209 | {
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210 | // por ahora solo sacar el lod basado en la camara
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211 | for (Vector<lodobj_node_t>::Iterator it = lodobj_container->lodobj_dists.Begin();
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212 | it != lodobj_container->lodobj_dists.End(); it ++)
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213 | {
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214 | float lodfactor = 1.0f - ((it->dist2cam - near_range) / (far_range - near_range));
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215 | if (lodfactor < 0.0f)
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216 | lodfactor = 0.0f;
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217 | if (lodfactor > 1.0f)
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218 | lodfactor = 1.0f;
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219 |
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220 | if (force_highest_lod)
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221 | lodfactor = 1.0f;
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222 |
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223 | ChangeLOD(it,lodfactor);
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224 | }
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225 | }
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226 | }
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227 | camera_changed=false;
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228 | node_added=false;
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229 | }
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230 |
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231 | void Geometry::LodManager::ChangeLOD(lodobj_node_t *lodobjnode, Real lodfactor)
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232 | {
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233 | LodObject *lodobj = lodobjnode->lodobj;
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234 |
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235 | if (always_calculate_lod)
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236 | {
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237 | lodobj->GoToLod(lodfactor);
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238 | return;
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239 | }
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240 |
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241 | // if the lodfactor is exactly 1.0 its level of detail must be always regenerated (for closeups)
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242 | if (lodfactor<1.0f)
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243 | {
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244 | // if the desired lod is very similar to the previous one,
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245 | // then there is no need to change the level of detail at all
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246 | // float sim = fabsf(lodfactor - lodobjnode->lodfactor);
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247 | // if (sim <= MINIMUM_VALID_LOD_SIMILARITY)
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248 | // return; // do not change anything if the lod is very similar!
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249 | int desiredpos = lodobj_container->lod2precalpos(lodfactor);
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250 | int mypos = lodobj_container->lod2precalpos(lodobjnode->lodfactor);
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251 | if (mypos==desiredpos)
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252 | return;
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253 | }
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254 |
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255 | lodobj_node_t *found_node = FindMostSimilarRealLOD(lodobjnode->name,lodfactor);
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256 |
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257 | if (found_node && found_node->lodobj->GetUniqueID()!=lodobj->GetUniqueID())
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258 | {
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259 | // DEBUG
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260 | assert(found_node->master==NULL);
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261 |
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262 | // float sim = fabsf(lodfactor - found_node->lodfactor);
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263 | // if (sim <= MINIMUM_VALID_LOD_SIMILARITY)
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264 | int desiredpos = lodobj_container->lod2precalpos(lodfactor);
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265 | int foundpos = lodobj_container->lod2precalpos(found_node->lodfactor);
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266 | if (foundpos==desiredpos)
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267 | {
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268 | lodobj->GetIndexDataInterface()->BorrowIndexData(found_node->lodobj->GetIndexDataInterface());
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269 | MakeDiscipleOf(found_node,lodobjnode);
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270 | }
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271 | else
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272 | ReallyGoToLOD(lodobjnode,lodfactor);
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273 | }
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274 | else
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275 | ReallyGoToLOD(lodobjnode,lodfactor);
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276 |
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277 | lodobjnode->lodfactor = lodfactor;
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278 | }
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279 |
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280 | void Geometry::LodManager::DeleteMeFromMyMastersDiscipleList(lodobj_node_t *lodobjnode)
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281 | {
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282 | // if I have a master...
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283 | if (lodobjnode->master)
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284 | lodobjnode->master->disciples.RemoveKey(lodobjnode->lodobj->GetUniqueID());
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285 | }
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286 |
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287 |
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288 | void Geometry::LodManager::MakeIndependent(lodobj_node_t *lodobjnode)
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289 | {
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290 | DeleteMeFromMyMastersDiscipleList(lodobjnode);
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291 |
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292 | // next, delete my master
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293 | lodobjnode->master=NULL;
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294 | }
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295 |
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296 | void Geometry::LodManager::MakeDiscipleOf(lodobj_node_t *master_node, lodobj_node_t *disciple_node)
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297 | {
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298 | ChangeMaster(disciple_node, master_node);
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299 |
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300 | // delete my disciples
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301 | disciple_node->disciples.Clear();
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302 |
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303 | // first remove me from my master's disciple list
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304 | DeleteMeFromMyMastersDiscipleList(disciple_node);
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305 |
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306 | master_node->disciples.GetAdd(disciple_node->lodobj->GetUniqueID()) = disciple_node;
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307 |
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308 | // set master
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309 | disciple_node->master = master_node;
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310 |
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311 | // no one must take me as a master!
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312 | if (disciple_node->precalpos!=-1)
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313 | {
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314 | // lodobj_container->precalculated_lods[disciple_node->precalpos] = NULL;
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315 | lodobj_container->GetPrecalculatedLOD(master_node->name,disciple_node->precalpos) = NULL;
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316 | disciple_node->precalpos = -1;
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317 | }
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318 | }
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319 |
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320 | void Geometry::LodManager::ChangeMaster(lodobj_node_t *lodobj, lodobj_node_t *newmaster)
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321 | {
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322 | // delete me from my disciples' master list
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323 | for (VectorMap<uint32,lodobj_node_t*>::Iterator it = lodobj->disciples.Begin(); it != lodobj->disciples.End(); it++)
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324 | {
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325 | lodobj_node_t * auxnode = *it;
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326 | assert(auxnode->master->lodobj->GetUniqueID() == lodobj->lodobj->GetUniqueID());
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327 | // auxnode->master = NULL;
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328 | // chanbge the master to the new one
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329 | auxnode->master = newmaster;
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330 |
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331 | // add the new disciple to the new master
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332 | if (newmaster)
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333 | newmaster->disciples.GetAdd(auxnode->lodobj->GetUniqueID()) = auxnode;
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334 | }
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335 | }
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336 |
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337 |
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338 | void Geometry::LodManager::UpdateDisciples(lodobj_node_t *master_node)
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339 | {
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340 | for (VectorMap<uint32,lodobj_node_t*>::Iterator it= master_node->disciples.Begin(); it!= master_node->disciples.End(); it++)
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341 | {
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342 | lodobj_node_t *disciple_node = *it;
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343 | disciple_node->lodobj->GetIndexDataInterface()->BorrowIndexData(master_node->lodobj->GetIndexDataInterface());
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344 | disciple_node->lodfactor = master_node->lodobj->GetCurrentLodFactor(); // we can use currentlodfactor here because the master is supposed to be at its REAL level of detail
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345 | }
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346 | }
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347 |
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348 | void Geometry::LodManager::ReallyGoToLOD(lodobj_node_t *lodobjnode, Real lodfactor)
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349 | {
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350 | lodobjnode->lodobj->GoToLod(lodfactor);
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351 |
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352 | MakeIndependent(lodobjnode);
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353 | UpdateDisciples(lodobjnode);
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354 |
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355 | // store the precalculated lod in the table
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356 | int i = lodobj_container->lod2precalpos(lodfactor);
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357 |
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358 | assert(i>=0 && i<=lodobj_container->num_lod_sim); // <= por lo del +1
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359 |
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360 | if (lodobjnode->precalpos != -1)
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361 | //lodobj_container->precalculated_lods[lodobjnode->precalpos] = NULL;
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362 | lodobj_container->GetPrecalculatedLOD(lodobjnode->name,lodobjnode->precalpos) = NULL;
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363 |
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364 | // lodobj_container->precalculated_lods[i] = lodobjnode;
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365 | lodobj_container->GetPrecalculatedLOD(lodobjnode->name,i) = lodobjnode;
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366 |
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367 | lodobjnode->precalpos = i;
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368 | }
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369 |
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370 |
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371 | lodobj_node_t * Geometry::LodManager::FindMostSimilarRealLOD(const std::string &name, Real desired_lod)
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372 | {
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373 | uint32 i = lodobj_container->lod2precalpos(desired_lod);
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374 | assert(i>=0 && i<=lodobj_container->num_lod_sim); // <= por lo del +1
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375 | // lodobj_node_t *obj = lodobj_container->precalculated_lods[i];
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376 | lodobj_node_t *obj = lodobj_container->GetPrecalculatedLOD(name,i);
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377 |
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378 | return obj;
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379 | }
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380 |
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381 | void Geometry::LodManager::UpdateCamera(const Geometry::Vector3 &p)
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382 | {
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383 | lodobj_container->camera_pos = p;
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384 | camera_changed = true;
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385 | }
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386 |
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387 | void Geometry::LodManager::UpdateLODObjectPos(LodObject *o, const Geometry::Vector3 &p)
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388 | {
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389 | lodobj_container->lodobj_pos[o->GetUniqueID()] = p;
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390 | }
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391 |
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392 | float Geometry::LodManager::SelectRandomDistance(void) const
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393 | {
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394 | float linear_01 = (float)rand()/(float)RAND_MAX;
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395 | float exp_01 = linear_01*linear_01;
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396 | float real_dist = exp_01*near_range + (1.0f-exp_01)*far_range;
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397 | return real_dist;
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398 | }
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