root/OpenSceneGraph/trunk/src/osgPlugins/ive/TerrainTile.cpp @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2008 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13
14#include "Exception.h"
15#include "TerrainTile.h"
16#include "Group.h"
17#include "Layer.h"
18
19#include <osgDB/Options>
20#include <osgTerrain/GeometryTechnique>
21#include <osgTerrain/Terrain>
22
23using namespace ive;
24
25void TerrainTile::write(DataOutputStream* out)
26{
27    // Write Terrain's identification.
28    out->writeInt(IVETERRAINTILE);
29    // If the osg class is inherited by any other class we should also write this to file.
30    osg::Group*  group = dynamic_cast<osg::Group*>(this);
31    if(group)
32        ((ive::Group*)(group))->write(out);
33    else
34        out_THROW_EXCEPTION("Terrain::write(): Could not cast this osgTerrain::Terrain to an osg::Group.");
35
36    if (out->getVersion() >= VERSION_0044)
37    {
38        out->writeInt(getBlendingPolicy());
39    }
40
41    if (out->getVersion() >= VERSION_0026)
42    {
43        out->writeInt(getTileID().level);
44        out->writeInt(getTileID().x);
45        out->writeInt(getTileID().y);
46    }
47
48    if (out->getVersion() >= VERSION_0023)
49    {
50        out->writeLocator(getLocator());
51        out->writeLayer(getElevationLayer());
52
53        out->writeUInt(getNumColorLayers());
54        for(unsigned int i=0; i<getNumColorLayers(); ++i)
55        {
56            out->writeLayer(getColorLayer(i));
57        }
58    }
59    else
60    {
61        LayerHelper helper;
62
63        helper.writeLocator(out, getLocator());
64
65        helper.writeLayer(out, getElevationLayer());
66
67        out->writeUInt(getNumColorLayers());
68
69        for(unsigned int i=0; i<getNumColorLayers(); ++i)
70        {
71            helper.writeLayer(out, getColorLayer(i));
72        }
73    }
74
75    writeTerrainTechnique(out, getTerrainTechnique());
76
77}
78
79void TerrainTile::read(DataInputStream* in)
80{
81    // Peek on Terrain's identification.
82    int id = in->peekInt();
83    if (id != IVETERRAINTILE) in_THROW_EXCEPTION("TerrainTile::read(): Expected Terrain identification.");
84
85    // Read Terrain's identification.
86    id = in->readInt();
87    // If the osg class is inherited by any other class we should also read this from file.
88    osg::Group*  group = dynamic_cast<osg::Group*>(this);
89    if(group)
90        ((ive::Group*)(group))->read(in);
91    else
92        in_THROW_EXCEPTION("Terrain::read(): Could not cast this osgTerrain::Terrain to an osg::Group.");
93
94    if (in->getVersion() >= VERSION_0044)
95    {
96        setBlendingPolicy(static_cast<osgTerrain::TerrainTile::BlendingPolicy>(in->readInt()));
97    }
98
99    if (in->getVersion() >= VERSION_0026)
100    {
101
102        int level = in->readInt();
103        int x = in->readInt();
104        int y = in->readInt();
105        setTileID(osgTerrain::TileID(level,x,y));
106
107        // OSG_NOTICE<<"Read TileID("<<level<<", "<<x<<", "<<y<<")"<<std::endl;
108    }
109
110    if (in->getVersion() >= VERSION_0023)
111    {
112        setLocator(in->readLocator());
113        setElevationLayer(in->readLayer());
114        unsigned int numColorLayers = in->readUInt();
115        for(unsigned int i=0; i<numColorLayers; ++i)
116        {
117            setColorLayer(i, in->readLayer());
118        }
119    }
120    else
121    {
122        LayerHelper helper;
123
124        setLocator(helper.readLocator(in));
125
126        setElevationLayer(helper.readLayer(in));
127
128        unsigned int numColorLayers = in->readUInt();
129        for(unsigned int i=0; i<numColorLayers; ++i)
130        {
131            setColorLayer(i, helper.readLayer(in));
132        }
133    }
134
135    setTerrainTechnique(readTerrainTechnique(in));
136
137    if (in->getOptions())
138    {
139        osg::ref_ptr<osg::Node> node;
140        if (in->getOptions()->getTerrain().lock(node))
141        {
142            setTerrain(node->asTerrain());
143        }
144    }
145
146    if (osgTerrain::TerrainTile::getTileLoadedCallback().valid())
147        osgTerrain::TerrainTile::getTileLoadedCallback()->loaded(this, in->getOptions());
148}
149
150void TerrainTile::writeTerrainTechnique(DataOutputStream* out, osgTerrain::TerrainTechnique* technique)
151{
152    if (dynamic_cast<osgTerrain::GeometryTechnique*>(technique))
153    {
154        out->writeBool(true);
155        out->writeInt(IVEGEOMETRYTECHNIQUE);
156    }
157    else
158    {
159        out->writeBool(false);
160    }
161}
162
163osgTerrain::TerrainTechnique* TerrainTile::readTerrainTechnique(DataInputStream* in)
164{
165    bool hasTechnique = in->readBool();
166    if (!hasTechnique) return 0;
167
168    int id = in->readInt();
169    if (id==IVEGEOMETRYTECHNIQUE)
170    {
171        return new osgTerrain::GeometryTechnique;
172    }
173    else
174    {
175        return 0;
176    }
177}
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