Mercurial > gemma

annotate pkg/octree/loader.go @ 1017:a244b18cb916

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Added GNU Affero General Public License. Adjusted the headers of the Go files to be AGPLv3.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 23 Oct 2018 18:15:14 +0200
parents b0bd242ff821
children de09bd3b5c05
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rev   line source
1017
a244b18cb916 Added GNU Affero General Public License.
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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
727
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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)))
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125 }
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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(
41c8dc61f38f Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 726
diff changeset
131 bytes.NewReader(data))))
41c8dc61f38f Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 726
diff changeset
132 }