Mercurial > gemma

annotate pkg/octree/loader.go @ 729:b0bd242ff821

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Removed vertex duplicate.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sat, 22 Sep 2018 22:14:31 +0200
parents 41c8dc61f38f
children a244b18cb916
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
727
41c8dc61f38f Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 726
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1 package octree
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2
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3 import (
120a82bd9953 octree: Added loading frame for contour generation.
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4 "bufio"
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5 "bytes"
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6 "encoding/binary"
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7 "log"
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8 "os"
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9
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10 "github.com/golang/snappy"
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11 )
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12
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13 func loadReader(r *bufio.Reader) (*Tree, error) {
41c8dc61f38f Moved octree loading stuff to octree package.
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14 tree := new(Tree)
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15
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5af9ab39e715 Renamed a few types to uppercase names to prepare the move to the octree package.
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16 if err := binary.Read(r, binary.LittleEndian, &tree.EPSG); err != nil {
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17 return nil, err
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18 }
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19
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20 log.Printf("EPSG: %d\n", tree.EPSG)
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21
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b0bd242ff821 Removed vertex duplicate.
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22 if err := tree.Min.Read(r); err != nil {
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23 return nil, err
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24 }
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25
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26 if err := tree.Max.Read(r); err != nil {
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27 return nil, err
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28 }
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29
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30 log.Printf("BBOX: [[%f, %f, %f], [%f, %f, %f]]\n",
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31 tree.Min.X, tree.Min.Y, tree.Min.Z,
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32 tree.Max.X, tree.Max.Y, tree.Max.Z)
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33
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34 var numVertices uint32
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35 if err := binary.Read(r, binary.LittleEndian, &numVertices); 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 log.Printf("vertices: %d\n", numVertices)
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40
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41 vertices := make([]Vertex, numVertices)
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42 tree.vertices = vertices
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43
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44 for i := range vertices {
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45 if err := vertices[i].Read(r); err != nil {
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46 return nil, err
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47 }
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48 }
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49
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50 var numTriangles uint32
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51 if err := binary.Read(r, binary.LittleEndian, &numTriangles); err != nil {
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52 return nil, err
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53 }
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54
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55 log.Printf("triangles: %d\n", numTriangles)
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56
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57 indices := make([]int32, 3*numTriangles)
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58 triangles := make([][]int32, numTriangles)
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59 tree.triangles = triangles
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60
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61 var last int32
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62
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63 for i := range triangles {
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64 tri := indices[:3]
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65 indices = indices[3:]
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66 triangles[i] = tri
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67 for j := range tri {
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68 v, err := binary.ReadVarint(r)
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69 if err != nil {
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70 return nil, err
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71 }
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72 value := int32(v) + last
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73 tri[j] = value
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74 last = value
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75 }
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76 }
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77
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78 var numNodes uint32
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79 if err := binary.Read(r, binary.LittleEndian, &numNodes); err != nil {
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80 return nil, err
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81 }
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82
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83 log.Printf("num nodes: %d\n", numNodes)
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84
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85 tree.index = make([]int32, numNodes)
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86 entries := tree.index[1:]
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87
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88 last = 0
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89 for i := range entries {
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90 v, err := binary.ReadVarint(r)
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91 if err != nil {
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92 return nil, err
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93 }
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94 value := int32(v) + last
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95 entries[i] = value
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96 last = value
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97 }
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98
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99 return tree, nil
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100 }
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101
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102 func LoadTree(fname string) (*Tree, error) {
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103
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104 f, err := os.Open(fname)
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105 if err != nil {
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106 return nil, err
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107 }
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108 defer f.Close()
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109 return loadReader(
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110 bufio.NewReader(
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111 snappy.NewReader(f)))
674
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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 }