Mercurial > gemma
annotate pkg/mesh/tin.go @ 5520:05db984d3db1
Improve performance of bottleneck area calculation
Avoid buffer calculations by replacing them with simple distance comparisons
and calculate the boundary of the result geometry only once per iteration.
In some edge cases with very large numbers of iterations, this reduced
the runtime of a bottleneck import by a factor of more than twenty.
author | Tom Gottfried <tom@intevation.de> |
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date | Thu, 21 Oct 2021 19:50:39 +0200 |
parents | 5f47eeea988d |
children | 1222b777f51f |
rev | line source |
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1 // This is Free Software under GNU Affero General Public License v >= 3.0 |
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2 // without warranty, see README.md and license for details. |
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3 // |
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4 // SPDX-License-Identifier: AGPL-3.0-or-later |
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5 // License-Filename: LICENSES/AGPL-3.0.txt |
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6 // |
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7 // Copyright (C) 2018 by via donau |
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH |
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9 // Software engineering by Intevation GmbH |
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10 // |
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11 // Author(s): |
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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13 |
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14 package mesh |
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15 |
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16 import ( |
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17 "bytes" |
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18 "encoding/binary" |
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19 "errors" |
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20 "fmt" |
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21 "io" |
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22 "math" |
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23 |
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24 "gemma.intevation.de/gemma/pkg/log" |
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25 "gemma.intevation.de/gemma/pkg/models" |
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26 "gemma.intevation.de/gemma/pkg/wkb" |
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27 ) |
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28 |
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29 var ( |
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30 errNoByteSlice = errors.New("not a byte slice") |
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31 errTooLessPoints = errors.New("too less points") |
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32 ) |
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33 |
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34 // Tin stores a mesh of triangles with common vertices. |
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35 type Tin struct { |
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36 // EPSG holds the projection. |
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37 EPSG uint32 |
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38 // Vertices are the shared vertices. |
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39 Vertices []Vertex |
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40 // Triangles are the triangles. |
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41 Triangles [][]int32 |
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42 |
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43 // Min is the lower left corner of the bbox. |
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44 Min Vertex |
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45 // Max is the upper right corner of the bbox. |
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46 Max Vertex |
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47 } |
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48 |
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49 func (t *Tin) Clip(polygon *Polygon) map[int32]struct{} { |
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50 var tree STRTree |
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51 tree.Build(t) |
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52 return tree.Clip(polygon) |
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53 } |
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54 |
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55 // FromWKB constructs the TIN from a WKB representation. |
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56 // Shared vertices are identified and referenced by the |
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57 // same index. |
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58 func (t *Tin) FromWKB(data []byte) error { |
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59 log.Infof("data length %d\n", len(data)) |
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60 |
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61 r := bytes.NewReader(data) |
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62 |
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63 endian, err := r.ReadByte() |
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64 |
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65 var order binary.ByteOrder |
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66 |
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67 switch { |
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68 case err != nil: |
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69 return err |
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70 case endian == wkb.NDR: |
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71 order = binary.LittleEndian |
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72 case endian == wkb.XDR: |
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73 order = binary.BigEndian |
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74 default: |
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75 return fmt.Errorf("unknown byte order %x", endian) |
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76 } |
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77 |
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78 var geomType uint32 |
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79 err = binary.Read(r, order, &geomType) |
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80 |
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81 switch { |
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82 case err != nil: |
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83 return err |
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84 case geomType != wkb.TinZ: |
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85 return fmt.Errorf("unknown geometry type %x", geomType) |
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86 } |
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87 |
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88 var num uint32 |
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89 if err = binary.Read(r, order, &num); err != nil { |
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90 return err |
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91 } |
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92 |
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93 vertices := make([]Vertex, 0, 100000) |
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94 |
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95 var v Vertex |
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96 |
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97 v2i := make(map[Vertex]int32, 100000) |
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98 |
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99 var indexPool []int32 |
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100 |
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101 allocIndices := func() []int32 { |
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102 if len(indexPool) == 0 { |
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103 indexPool = make([]int32, 3*8*1024) |
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104 } |
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105 ids := indexPool[:3] |
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106 indexPool = indexPool[3:] |
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107 return ids |
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108 } |
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109 |
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110 var triangles [][]int32 |
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111 |
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112 min := Vertex{math.MaxFloat64, math.MaxFloat64, math.MaxFloat64} |
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113 max := Vertex{-math.MaxFloat64, -math.MaxFloat64, -math.MaxFloat64} |
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114 |
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115 for i := uint32(0); i < num; i++ { |
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116 |
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117 endian, err = r.ReadByte() |
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118 switch { |
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119 case err != nil: |
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120 return err |
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121 case endian == wkb.NDR: |
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122 order = binary.LittleEndian |
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123 case endian == wkb.XDR: |
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124 order = binary.BigEndian |
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125 default: |
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126 return fmt.Errorf("unknown byte order %x", endian) |
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127 } |
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128 |
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129 err = binary.Read(r, order, &geomType) |
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130 switch { |
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131 case err != nil: |
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132 return err |
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133 case geomType != wkb.TriangleZ: |
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134 return fmt.Errorf("unknown geometry type %d", geomType) |
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135 } |
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136 |
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137 var rings uint32 |
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138 if err = binary.Read(r, order, &rings); err != nil { |
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139 return err |
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140 } |
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141 triangle := allocIndices() |
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142 |
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143 for ring := uint32(0); ring < rings; ring++ { |
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144 var npoints uint32 |
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145 if err = binary.Read(r, order, &npoints); err != nil { |
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146 return err |
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147 } |
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148 |
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149 if npoints < 3 { |
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150 return errTooLessPoints |
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151 } |
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152 |
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153 for p := uint32(0); p < npoints; p++ { |
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154 var x, y, z uint64 |
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155 for _, addr := range []*uint64{&x, &y, &z} { |
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156 if err = binary.Read(r, order, addr); err != nil { |
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157 return err |
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158 } |
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159 } |
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160 if p >= 3 || ring >= 1 { |
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161 // Don't store the forth point. |
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162 continue |
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163 } |
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164 // Do this conversion later to spare reflect calls |
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165 // and allocs in binary.Read. |
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166 v.X = math.Float64frombits(x) |
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167 v.Y = math.Float64frombits(y) |
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168 v.Z = math.Float64frombits(z) |
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169 idx, found := v2i[v] |
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170 if !found { |
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171 idx = int32(len(vertices)) |
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172 v2i[v] = idx |
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173 vertices = append(vertices, v) |
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174 min.Minimize(v) |
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175 max.Maximize(v) |
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176 } |
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177 triangle[p] = idx |
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178 } |
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179 } |
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180 triangles = append(triangles, triangle) |
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181 } |
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182 |
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183 log.Infof("bbox: [[%f, %f], [%f, %f]]\n", |
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184 min.X, min.Y, max.X, max.Y) |
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185 |
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186 *t = Tin{ |
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187 EPSG: models.WGS84, |
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188 Vertices: vertices, |
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189 Triangles: triangles, |
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190 Min: min, |
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191 Max: max, |
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192 } |
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193 |
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194 return nil |
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195 } |
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196 |
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197 // Scan implements the sql.Scanner interface. |
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198 func (t *Tin) Scan(raw interface{}) error { |
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199 if raw == nil { |
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200 return nil |
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201 } |
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202 data, ok := raw.([]byte) |
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203 if !ok { |
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204 return errNoByteSlice |
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205 } |
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206 return t.FromWKB(data) |
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207 } |
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208 |
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209 func (t *Tin) serialize(w io.Writer) error { |
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210 |
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211 if err := binary.Write(w, binary.LittleEndian, t.EPSG); err != nil { |
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212 return err |
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213 } |
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214 |
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215 if err := t.Min.Write(w); err != nil { |
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216 return err |
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217 } |
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218 if err := t.Max.Write(w); err != nil { |
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219 return err |
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220 } |
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221 |
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222 if err := binary.Write( |
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223 w, binary.LittleEndian, uint32(len(t.Vertices))); err != nil { |
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224 return err |
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225 } |
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226 |
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227 var err error |
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228 vwrite := func(v float64) { |
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229 if err == nil { |
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230 err = binary.Write(w, binary.LittleEndian, math.Float64bits(v)) |
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231 } |
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232 } |
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233 |
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234 for _, v := range t.Vertices { |
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235 vwrite(v.X) |
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236 vwrite(v.Y) |
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237 vwrite(v.Z) |
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238 } |
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239 |
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240 if err != nil { |
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241 return err |
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242 } |
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243 log.Infof("vertices %d (%d)\n", len(t.Vertices), len(t.Vertices)*3*8) |
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244 |
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245 if err := binary.Write( |
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246 w, binary.LittleEndian, uint32(len(t.Triangles))); err != nil { |
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247 return err |
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248 } |
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249 |
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250 var buf [binary.MaxVarintLen32]byte |
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251 var written int |
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252 var last int32 |
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253 for _, triangle := range t.Triangles { |
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254 for _, idx := range triangle { |
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255 value := idx - last |
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256 n := binary.PutVarint(buf[:], int64(value)) |
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257 for p := buf[:n]; len(p) > 0; p = p[n:] { |
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258 var err error |
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259 if n, err = w.Write(p); err != nil { |
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260 return err |
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261 } |
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262 written += n |
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263 } |
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264 last = idx |
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265 } |
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266 } |
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267 log.Infof("compressed tin indices in bytes: %d (%d)\n", |
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268 written, 3*4*len(t.Triangles)) |
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269 |
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270 return nil |
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271 } |