1 | #ifndef __PVS_H
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2 | #define __PVS_H
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3 |
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4 | #include <map>
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5 | #include <vector>
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6 | #include "common.h"
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7 |
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8 | namespace GtpVisibilityPreprocessor {
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9 |
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10 | class KdNode;
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11 | class BspNode;
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12 | class Ray;
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13 | class Intersectable;
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14 | class ViewCell;
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15 |
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16 |
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17 | template<typename T>
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18 | struct LtSample
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19 | {
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20 | bool operator()(const T a, const T b) const
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21 | {
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22 | return a < b;
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23 | }
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24 | };
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25 |
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26 | /** Information stored with a PVS entry. Consists of the number
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27 | the object was seen from the view cell.
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28 | */
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29 | class PvsData {
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30 | public:
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31 | /// sum of probability density of visible sample rays
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32 | float mSumPdf;
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33 |
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34 | PvsData() {}
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35 | PvsData(const float sumPdf):
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36 | mSumPdf(sumPdf) {}
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37 |
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38 | // $$JB in order to return meaningfull values
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39 | // it assumes that the sum pdf has been normalized somehow!!!
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40 | float GetVisibility()
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41 | {
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42 | return mSumPdf;
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43 | }
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44 | };
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45 |
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46 |
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47 | class MailablePvsData
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48 | {
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49 | ////////////////////////////
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50 | // Mailing stuff
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51 | protected:
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52 | int mMailbox;
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53 |
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54 | public:
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55 | // last mail id -> warning not thread safe!
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56 | // both mailId and mailbox should be unique for each thread!!!
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57 | static int sMailId;
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58 | static int sReservedMailboxes;
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59 |
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60 |
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61 | static void NewMail(const int reserve = 1) {
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62 | sMailId += sReservedMailboxes;
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63 | sReservedMailboxes = reserve;
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64 | }
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65 |
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66 | void Mail() { mMailbox = sMailId; }
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67 | bool Mailed() const { return mMailbox == sMailId; }
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68 |
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69 | void Mail(const int mailbox) { mMailbox = sMailId + mailbox; }
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70 | bool Mailed(const int mailbox) const { return mMailbox == sMailId + mailbox; }
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71 |
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72 | int IncMail() { return ++ mMailbox - sMailId; }
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73 | //////////////////////////////////////////
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74 |
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75 | // sum of probability density of visible sample rays
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76 | float mSumPdf;
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77 | int mCounter;
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78 |
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79 | MailablePvsData() {}
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80 | MailablePvsData(const float sumPdf):
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81 | mSumPdf(sumPdf) {}
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82 |
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83 | // $$JB in order to return meaningfull values
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84 | // it assumes that the sum pdf has been normalized somehow!!!
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85 | float GetVisibility()
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86 | {
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87 | return mSumPdf;
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88 | }
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89 | };
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90 |
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91 | /** Template class representing the Potentially Visible Set (PVS)
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92 | mainly from a view cell, but also e.g., from objects.
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93 | */
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94 | template<typename T, typename S>
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95 | class Pvs
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96 | {
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97 | public:
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98 | //vector<pair<T, S> >::iterator mItEnd;
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99 | template<typename T, typename S>
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100 | class Iterator
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101 | {
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102 | //template<typename T, typename S> friend Pvs<T, S>;
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103 | private:
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104 | //std::vector<std::pair<T, S> >::iterator mIt;
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105 | //vector<pair<T, S> >::iterator mItEnd;
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106 | };
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107 |
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108 | template<typename T, typename S>
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109 | class ConstIterator
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110 | {
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111 | // template<typename T, typename S> friend Pvs<T, S>;
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112 | private:
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113 | //vector<pair<T, S> >::const_iterator mIt;
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114 | //vector<pair<T, S> >::const_iteator mItEnd;
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115 | };
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116 |
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117 | Pvs(): mSamples(0), mEntries() {}
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118 |
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119 |
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120 | //virtual ~Pvs();
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121 |
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122 | /** Compresses PVS lossless or lossy.
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123 | */
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124 | int Compress() {return 0;}
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125 | int GetSize() const {return (int)mEntries.size();}
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126 | bool Empty() const {return mEntries.empty();}
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127 |
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128 | /** Normalize the visibility of entries in order to get comparable
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129 | results
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130 | */
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131 | void NormalizeMaximum();
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132 |
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133 | /** Merges pvs of a into this pvs.
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134 | */
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135 | void Merge(const Pvs<T, S> &a);
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136 |
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137 | /** Difference of pvs to pvs b.
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138 | @returns number of different entries.
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139 | */
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140 | int Diff(const Pvs<T, S> &b);
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141 |
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142 | /** Finds sample in PVS.
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143 | @returns sample if found, NULL otherwise.
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144 | */
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145 | S *Find(T sample);
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146 |
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147 | bool GetSampleContribution(T sample, const float pdf, float &contribution);
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148 |
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149 | /** Adds sample to PVS.
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150 | @contribution contribution of sample (0 or 1)
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151 | @returns true if sample was not already in PVS.
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152 | */
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153 | bool AddSample(T sample, const float pdf, float &contribution);
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154 |
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155 | /** Adds sample to PVS.
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156 | @returns contribution of sample (0 or 1)
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157 | */
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158 | float AddSample(T sample, const float pdf);
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159 |
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160 | /** Adds sample to PVS.
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161 | @returns PvsData
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162 | */
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163 | S *AddSample2(T sample, const float pdf);
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164 |
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165 | /** Adds one pvs to another one.
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166 | @returns new pvs size
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167 | */
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168 | int AddPvs(const Pvs<T, S> &pvs);
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169 |
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170 | /** Subtracts one pvs from another one.
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171 | WARNING: could contains bugs
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172 | @returns new pvs size
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173 | */
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174 | int SubtractPvs(const Pvs<T, S> &pvs);
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175 | /** Returns PVS data, i.e., how often it was seen from the view cell,
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176 | and the object itsef.
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177 | */
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178 | void GetData(const int index, T &entry, S &data);
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179 |
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180 | /** Collects the PVS entries and returns them in the vector.
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181 | */
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182 | void CollectEntries(std::vector<T> &entries);
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183 |
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184 | /** Removes sample from PVS if reference count is zero.
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185 | @param visibleSamples number of references to be removed
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186 | */
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187 | bool RemoveSample(T sample, const float pdf);
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188 |
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189 | /** Compute continuous PVS difference
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190 | */
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191 | void ComputeContinuousPvsDifference(Pvs<T, S> &pvs,
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192 | float &pvsReduction,
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193 | float &pvsEnlargement);
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194 |
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195 |
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196 | /** Clears the pvs.
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197 | */
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198 | void Clear();
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199 |
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200 | static int GetEntrySizeByte();
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201 | static float GetEntrySize();
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202 |
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203 | /** Compute continuous PVS difference */
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204 | float GetPvsHomogenity(Pvs<T, S> &pvs) {
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205 | float pvsReduction, pvsEnlargement;
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206 |
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207 | ComputeContinuousPvsDifference(pvs,
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208 | pvsReduction,
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209 | pvsEnlargement);
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210 |
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211 | return pvsReduction + pvsEnlargement;
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212 | }
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213 |
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214 | int Size() { return mEntries.size(); }
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215 |
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216 | //vector<pair<T, S> >::const_iterator &GetConstIterator() const { return mEntries.begin(); }
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217 | //vector<pair<T, S> >::iterator &GetIterator() { return mEntries.begin(); }
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218 |
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219 | //protected:
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220 |
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221 | /// vector of PVS entries
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222 | vector<pair<T, S> > mEntries;
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223 |
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224 | /// Number of samples used to create the PVS
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225 | int mSamples;
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226 | };
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227 |
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228 |
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229 |
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230 | /**
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231 | Compute continuous PVS difference of 'b' with respect to the base PVS (*this).
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232 | Provides separatelly PVS reduction from PVS enlargement.
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233 |
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234 | */
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235 | template <typename T, typename S>
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236 | void
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237 | Pvs<T, S>::ComputeContinuousPvsDifference(Pvs<T, S> &b,
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238 | float &pvsReduction,
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239 | float &pvsEnlargement)
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240 | {
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241 | pvsReduction = 0.0f;
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242 | pvsEnlargement = 0.0f;
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243 | // Uses sum of log differences, which corresponds to entropy
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244 | std::vector<pair<T, S> >::iterator it;
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245 |
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246 | for (it = b.mEntries.begin(); it != b.mEntries.end(); ++ it)
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247 | {
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248 | float bSumPdf = (*it).second.mSumPdf;
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249 | float aSumPdf = 0.0f;
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250 | S *data = Find((*it).first);
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251 |
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252 | if (data)
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253 | {
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254 | aSumPdf = data->mSumPdf;
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255 | // mark this entry as processed to avoid double counting
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256 | data->mSumPdf = -aSumPdf;
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257 | }
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258 |
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259 | #if 0
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260 | float diff = bSumPdf - aSumPdf;
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261 |
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262 | if (diff > 0.0f) {
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263 | pvsEnlargement += diff;
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264 | } else {
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265 | pvsReduction += -diff;
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266 | }
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267 | #else
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268 | if (!data)
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269 | pvsEnlargement += 1.0f;
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270 | #endif
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271 | }
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272 |
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273 | for (it = mEntries.begin(); it != mEntries.end(); ++ it) {
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274 | float aSumPdf = (*it).second.mSumPdf;
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275 | float bSumPdf = 0.0f;
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276 | if (aSumPdf < 0.0f) {
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277 | // this entry was already accounted for!
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278 | // just revert it back
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279 | (*it).second.mSumPdf = -aSumPdf;
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280 | } else {
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281 | S *data = b.Find((*it).first);
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282 | if (data) {
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283 | bSumPdf = data->mSumPdf;
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284 | }
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285 | #if 0
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286 | float diff = bSumPdf - aSumPdf;
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287 |
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288 | if (diff > 0.0f) {
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289 | pvsEnlargement += diff;
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290 | } else {
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291 | pvsReduction += -diff;
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292 | }
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293 |
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294 | #else
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295 | if (!data)
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296 | pvsReduction += 1.0f;
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297 | #endif
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298 | }
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299 | }
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300 | }
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301 |
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302 |
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303 | template <typename T, typename S>
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304 | int Pvs<T, S>::Diff(const Pvs<T, S> &b)
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305 | {
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306 | int dif = 0;
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307 |
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308 | std::vector<pair<T, S> >::const_iterator it;
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309 |
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310 | for (it = b.mEntries.begin(); it != b.mEntries.end(); ++ it)
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311 | {
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312 | S data = Find((*it).first);
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313 | if (!data) ++ dif;
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314 | }
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315 |
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316 | return dif;
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317 | }
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318 |
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319 | template <typename T, typename S> void Pvs<T, S>::Merge(const Pvs<T, S> &a)
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320 | {
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321 | #if TODO
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322 | const int samples = mSamples + a.mSamples;
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323 |
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324 | std::vector<pair<T, S>> >::const_iterator it;
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325 |
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326 | for (it = a.mEntries.begin(); it != a.mEntries.end(); ++ it)
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327 | {
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328 | AddSample((*it).first, (*it).second.mSumPdf);
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329 | }
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330 |
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331 | mSamples = samples;
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332 | #endif
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333 | }
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334 |
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335 |
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336 | template <typename T, typename S> void Pvs<T, S>::Clear()
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337 | {
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338 | mEntries.clear();
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339 | }
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340 |
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341 |
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342 | template <typename T, typename S>
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343 | S *Pvs<T, S>::Find(T sample)
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344 | {
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345 | #if TODO
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346 | std::vector<pair<T, S>, LtSample<T> >::iterator i = mEntries.find(sample);
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347 |
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348 | if (i != mEntries.end())
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349 | {
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350 | return &(*i).second;
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351 | }
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352 | else
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353 | {
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354 | return NULL;
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355 | }
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356 | #else
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357 | return NULL;
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358 | #endif
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359 | }
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360 |
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361 | template <typename T, typename S>
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362 | void Pvs<T, S>::GetData(const int index,
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363 | T &entry,
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364 | S &data)
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365 | {
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366 | std::vector<pair<T, S> >::iterator i = mEntries.begin();
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367 | for (int k = 0; k != index && i != mEntries.end(); ++ i, ++ k);
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368 |
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369 | entry = (*i).first;
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370 | data = (*i).second;
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371 | }
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372 |
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373 |
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374 | template <typename T, typename S>
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375 | float
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376 | Pvs<T, S>::AddSample(T sample, const float pdf)
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377 | {
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378 | #if TODO
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379 | ++ mSamples;
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380 | S *data = Find(sample);
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381 |
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382 | if (data)
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383 | {
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384 | data->mSumPdf += pdf;
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385 | return data->mSumPdf;
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386 | }
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387 | else
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388 | {
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389 | mEntries[sample] = S(pdf);
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390 | return pdf;
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391 | }
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392 | #else
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393 | return 0;
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394 | #endif
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395 | }
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396 |
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397 |
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398 | template <typename T, typename S>
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399 | S * Pvs<T, S>::AddSample2(T sample, const float pdf)
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400 | {
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401 | mSamples++;
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402 | S *data = Find(sample);
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403 |
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404 | if (data)
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405 | {
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406 | data->mSumPdf += pdf;
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407 | }
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408 | else
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409 | {
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410 | mEntries[sample] = S(pdf);
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411 | data = Find(sample);
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412 | }
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413 |
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414 | return data;
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415 | }
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416 |
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417 | template <typename T, typename S>
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418 | bool Pvs<T, S>::AddSample(T sample,
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419 | const float pdf,
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420 | float &contribution)
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421 | {
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422 | ++ mSamples;
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423 | S *data = Find(sample);
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424 | #if TODO
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425 | if (data)
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426 | {
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427 | data->mSumPdf += pdf;
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428 | contribution = pdf / data->mSumPdf;
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429 | return false;
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430 | }
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431 | else {
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432 | mEntries[sample] = S(pdf);
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433 | contribution = 1.0f;
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434 | return true;
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435 | }
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436 | #else
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437 | return true;
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438 | #endif
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439 | }
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440 |
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441 | template <typename T, typename S>
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442 | bool
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443 | Pvs<T, S>::GetSampleContribution(T sample,
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444 | const float pdf,
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445 | float &contribution)
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446 | {
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447 | S *data = Find(sample);
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448 |
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449 | if (data) {
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450 | contribution = pdf / (data->mSumPdf + pdf);
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451 | return false;
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452 | }
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453 | else {
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454 | contribution = 1.0f;
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455 | return true;
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456 | }
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457 | }
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458 |
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459 | template <typename T, typename S>
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460 | bool Pvs<T, S>::RemoveSample(T sample,
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461 | const float pdf)
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462 | {
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463 | -- mSamples;
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464 | #if TODO
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465 | std::vector<pair<T, S> >::iterator it = mEntries.find(sample);
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466 |
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467 | if (it == mEntries.end())
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468 | return false;
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469 |
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470 | S *data = &(*it).second;
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471 |
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472 | data->mSumPdf -= pdf;
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473 |
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474 | if (data->mSumPdf <= 0.0f)
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475 | {
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476 | mEntries.erase(it);
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477 | }
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478 | #endif
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479 | return true;
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480 | }
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481 |
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482 | template <typename T, typename S>
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483 | int Pvs<T, S>::AddPvs(const Pvs<T, S> &pvs)
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484 | {
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485 | int samples = mSamples + pvs.mSamples;
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486 | std::vector<pair<T, S> >::
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487 | const_iterator it, it_end = pvs.mEntries.end();
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488 |
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489 | float contri;
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490 | // output PVS of view cell
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491 | for (it = pvs.mEntries.begin(); it != it_end; ++ it)
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492 | {
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493 | AddSample((*it).first, (*it).second.mSumPdf, contri);
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494 | }
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495 |
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496 | mSamples = samples;
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497 |
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498 | return GetSize();
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499 | }
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500 |
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501 | template <typename T, typename S>
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502 | int Pvs<T, S>::SubtractPvs(const Pvs<T, S> &pvs)
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503 | {
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504 | const int samples = mSamples - pvs.mSamples;
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505 | #if TODO
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506 | std::vector<pair<T, S> >::
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507 | const_iterator it, it_end = pvs.mEntries.end();
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508 |
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509 | // output PVS of view cell
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510 | for (it = pvs.mEntries.begin(); it != it_end; ++ it)
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511 | RemoveSample((*it).first, (*it).second.mSumPdf);
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512 |
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513 | mSamples = samples;
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514 | #endif
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515 | return GetSize();
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516 | }
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517 |
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518 | template <typename T, typename S>
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519 | void Pvs<T, S>::CollectEntries(std::vector<T> &entries)
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520 | {
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521 | std::vector<pair<T, S> >::
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522 | const_iterator it, it_end = mEntries.end();
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523 |
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524 | // output PVS of view cell
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525 | for (it = mEntries.begin(); it != it_end; ++ it)
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526 | entries.push_back((*it)->first);
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527 | }
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528 |
|
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529 | template <typename T, typename S>
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530 | void Pvs<T, S>::NormalizeMaximum()
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531 | {
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532 | std::vector<pair<T, S> >::
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533 | const_iterator it, it_end = mEntries.end();
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534 |
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535 | float maxPdfSum = -1.0f;
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536 |
|
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537 | // output PVS of view cell
|
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538 | for (it = mEntries.begin(); it != it_end; ++ it) {
|
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539 | float sum = (*it)->second.sumPdf;
|
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540 | if (sum > maxSum)
|
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541 | maxSum = sum;
|
---|
542 | }
|
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543 |
|
---|
544 | maxSum = 1.0f / maxSum;
|
---|
545 |
|
---|
546 | for (it = mEntries.begin(); it != it_end; ++ it) {
|
---|
547 | (*it)->second.sumPdf *= maxSum;
|
---|
548 | }
|
---|
549 |
|
---|
550 | }
|
---|
551 |
|
---|
552 |
|
---|
553 | template <typename T, typename S>
|
---|
554 | float Pvs<T, S>::GetEntrySize()
|
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555 | {
|
---|
556 | return (float)(sizeof(T) + sizeof(S)) / float(1024 * 1024);
|
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557 | }
|
---|
558 |
|
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559 |
|
---|
560 | template <typename T, typename S>
|
---|
561 | int Pvs<T, S>::GetEntrySizeByte()
|
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562 | {
|
---|
563 | return sizeof(T) + sizeof(S);
|
---|
564 | }
|
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565 |
|
---|
566 |
|
---|
567 | ///////////////////////////////////////
|
---|
568 |
|
---|
569 | /** Class instantiating the Pvs template for kd tree nodes.
|
---|
570 | */
|
---|
571 | class KdPvs: public Pvs<KdNode *, PvsData>
|
---|
572 | {
|
---|
573 | public:
|
---|
574 | int Compress();
|
---|
575 | };
|
---|
576 |
|
---|
577 |
|
---|
578 | class ObjectPvs: public Pvs<Intersectable *, PvsData>
|
---|
579 | {
|
---|
580 | public:
|
---|
581 | /** Counts object int the pvs. Different to method "GetSize", not
|
---|
582 | only the raw container size is returned,
|
---|
583 | but the individual contributions of the entries are summed up.
|
---|
584 | */
|
---|
585 | float EvalPvsCost() const;
|
---|
586 | };
|
---|
587 |
|
---|
588 |
|
---|
589 | ////////////
|
---|
590 | //-- typedefs
|
---|
591 |
|
---|
592 | //typedef std::map<KdNode *, PvsData, LtSample<KdNode *> > KdPvsMap;
|
---|
593 | //typedef std::map<Intersectable *, PvsData, LtSample<Intersectable *> > ObjectPvsEntries;
|
---|
594 | //typedef std::map<ViewCell *, MailablePvsData, LtSample<ViewCell *> > ViewCellPvsEntries;
|
---|
595 |
|
---|
596 |
|
---|
597 | typedef std::vector<pair<Intersectable *, PvsData> > ObjectPvsEntries;
|
---|
598 |
|
---|
599 | typedef Pvs<ViewCell *, MailablePvsData> ViewCellPvs;
|
---|
600 |
|
---|
601 | }
|
---|
602 |
|
---|
603 | #endif
|
---|
604 |
|
---|