Mercurial > gemma

annotate pkg/octree/loader.go @ 2465:86c7a023400e octree-diff

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Started experimental octree diff branch.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 25 Feb 2019 17:02:33 +0100
parents f4dcbe8941a1
children f5fce22184da
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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
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22 "github.com/golang/snappy"
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23 )
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24
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25 func loadReader(r *bufio.Reader) (*Tree, error) {
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26 tree := new(Tree)
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27
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28 if err := binary.Read(r, binary.LittleEndian, &tree.EPSG); err != nil {
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29 return nil, err
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30 }
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31
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32 log.Printf("info: EPSG: %d\n", tree.EPSG)
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33
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34 if err := tree.Min.Read(r); err != nil {
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35 return nil, err
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36 }
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37
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38 if err := tree.Max.Read(r); err != nil {
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39 return nil, err
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40 }
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41
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42 log.Printf("info: BBOX: [[%f, %f, %f], [%f, %f, %f]]\n",
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43 tree.Min.X, tree.Min.Y, tree.Min.Z,
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44 tree.Max.X, tree.Max.Y, tree.Max.Z)
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45
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46 var numVertices uint32
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47 if err := binary.Read(r, binary.LittleEndian, &numVertices); err != nil {
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48 return nil, err
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49 }
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50
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51 log.Printf("info: vertices: %d\n", numVertices)
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52
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53 vertices := make([]Vertex, numVertices)
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54 tree.vertices = vertices
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55
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56 for i := range vertices {
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57 if err := vertices[i].Read(r); err != nil {
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58 return nil, err
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59 }
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60 }
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61
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62 var numTriangles uint32
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63 if err := binary.Read(r, binary.LittleEndian, &numTriangles); err != nil {
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64 return nil, err
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65 }
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66
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67 log.Printf("info: triangles: %d\n", numTriangles)
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68
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69 indices := make([]int32, 3*numTriangles)
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70 triangles := make([][]int32, numTriangles)
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71 tree.triangles = triangles
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72
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73 var last int32
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74
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75 for i := range triangles {
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76 tri := indices[:3]
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77 indices = indices[3:]
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78 triangles[i] = tri
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79 for j := range tri {
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80 v, err := binary.ReadVarint(r)
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81 if err != nil {
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82 return nil, err
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83 }
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84 value := int32(v) + last
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85 tri[j] = value
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86 last = value
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87 }
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88 }
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89
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90 var numNodes uint32
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91 if err := binary.Read(r, binary.LittleEndian, &numNodes); err != nil {
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92 return nil, err
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93 }
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94
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95 log.Printf("info: num nodes: %d\n", numNodes)
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96
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97 tree.index = make([]int32, numNodes)
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98 entries := tree.index[1:]
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99
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100 last = 0
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101 for i := range entries {
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102 v, err := binary.ReadVarint(r)
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103 if err != nil {
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104 return nil, err
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105 }
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106 value := int32(v) + last
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107 entries[i] = value
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108 last = value
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109 }
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110
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111 return tree, nil
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112 }
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113
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114 func Deserialize(data []byte) (*Tree, error) {
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115 return loadReader(
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116 bufio.NewReader(
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117 snappy.NewReader(
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118 bytes.NewReader(data))))
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119 }