Mercurial > gemma
annotate pkg/octree/loader.go @ 1321:8d9754007089
Used keyed initializer to make 'go vet' happy.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Sat, 24 Nov 2018 16:40:34 +0100 |
parents | a244b18cb916 |
children | de09bd3b5c05 |
rev | line source |
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1017
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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 octree |
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15 |
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16 import ( |
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17 "bufio" |
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18 "bytes" |
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19 "encoding/binary" |
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20 "log" |
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21 "os" |
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22 |
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23 "github.com/golang/snappy" |
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24 ) |
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25 |
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26 func loadReader(r *bufio.Reader) (*Tree, error) { |
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27 tree := new(Tree) |
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28 |
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29 if err := binary.Read(r, binary.LittleEndian, &tree.EPSG); err != nil { |
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30 return nil, err |
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31 } |
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32 |
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33 log.Printf("EPSG: %d\n", tree.EPSG) |
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34 |
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35 if err := tree.Min.Read(r); err != nil { |
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36 return nil, err |
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37 } |
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38 |
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39 if err := tree.Max.Read(r); err != nil { |
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40 return nil, err |
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41 } |
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42 |
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43 log.Printf("BBOX: [[%f, %f, %f], [%f, %f, %f]]\n", |
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44 tree.Min.X, tree.Min.Y, tree.Min.Z, |
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45 tree.Max.X, tree.Max.Y, tree.Max.Z) |
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46 |
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47 var numVertices uint32 |
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48 if err := binary.Read(r, binary.LittleEndian, &numVertices); err != nil { |
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49 return nil, err |
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50 } |
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51 |
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52 log.Printf("vertices: %d\n", numVertices) |
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53 |
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54 vertices := make([]Vertex, numVertices) |
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55 tree.vertices = vertices |
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56 |
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57 for i := range vertices { |
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58 if err := vertices[i].Read(r); err != nil { |
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59 return nil, err |
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60 } |
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61 } |
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62 |
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63 var numTriangles uint32 |
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64 if err := binary.Read(r, binary.LittleEndian, &numTriangles); err != nil { |
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65 return nil, err |
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66 } |
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67 |
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68 log.Printf("triangles: %d\n", numTriangles) |
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69 |
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70 indices := make([]int32, 3*numTriangles) |
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71 triangles := make([][]int32, numTriangles) |
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72 tree.triangles = triangles |
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73 |
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74 var last int32 |
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75 |
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76 for i := range triangles { |
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77 tri := indices[:3] |
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78 indices = indices[3:] |
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79 triangles[i] = tri |
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80 for j := range tri { |
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81 v, err := binary.ReadVarint(r) |
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82 if err != nil { |
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83 return nil, err |
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84 } |
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85 value := int32(v) + last |
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86 tri[j] = value |
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87 last = value |
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88 } |
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89 } |
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90 |
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91 var numNodes uint32 |
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92 if err := binary.Read(r, binary.LittleEndian, &numNodes); err != nil { |
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93 return nil, err |
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94 } |
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95 |
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96 log.Printf("num nodes: %d\n", numNodes) |
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97 |
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98 tree.index = make([]int32, numNodes) |
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99 entries := tree.index[1:] |
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100 |
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101 last = 0 |
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102 for i := range entries { |
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103 v, err := binary.ReadVarint(r) |
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104 if err != nil { |
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105 return nil, err |
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106 } |
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107 value := int32(v) + last |
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108 entries[i] = value |
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109 last = value |
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110 } |
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111 |
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112 return tree, nil |
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113 } |
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114 |
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115 func LoadTree(fname string) (*Tree, error) { |
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116 |
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117 f, err := os.Open(fname) |
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118 if err != nil { |
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119 return nil, err |
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120 } |
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121 defer f.Close() |
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122 return loadReader( |
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123 bufio.NewReader( |
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124 snappy.NewReader(f))) |
674
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125 } |
727
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126 |
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127 func Deserialize(data []byte) (*Tree, error) { |
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128 return loadReader( |
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129 bufio.NewReader( |
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130 snappy.NewReader( |
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131 bytes.NewReader(data)))) |
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132 } |