1/****************************************************************************
2**
3** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt3D module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#ifndef GLTFGEOMETRYLOADER_H
41#define GLTFGEOMETRYLOADER_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists for the convenience
48// of other Qt classes. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtCore/QJsonDocument>
55
56#include <Qt3DRender/private/qgeometryloaderinterface_p.h>
57#include <Qt3DRender/qattribute.h>
58#include <Qt3DRender/qbuffer.h>
59
60#include <private/qlocale_tools_p.h>
61
62QT_BEGIN_NAMESPACE
63
64namespace Qt3DRender {
65
66#define GLTFGEOMETRYLOADER_EXT QLatin1String("gltf")
67#define JSONGEOMETRYLOADER_EXT QLatin1String("json")
68#define QGLTFGEOMETRYLOADER_EXT QLatin1String("qgltf")
69
70class QCamera;
71class QCameraLens;
72class QMaterial;
73class QShaderProgram;
74class QEffect;
75class QAbstractTexture;
76class QRenderState;
77class QTechnique;
78class QParameter;
79class QGeometryRenderer;
80class QGeometry;
81
82class GLTFGeometryLoader : public QGeometryLoaderInterface
83{
84 class BufferData
85 {
86 public:
87 BufferData();
88 explicit BufferData(const QJsonObject &json);
89
90 quint64 length;
91 QString path;
92 QByteArray *data;
93 // type if ever useful
94 };
95
96 class ParameterData
97 {
98 public:
99 ParameterData();
100 explicit ParameterData(const QJsonObject &json);
101
102 QString semantic;
103 int type;
104 };
105
106 class AccessorData
107 {
108 public:
109 AccessorData();
110 explicit AccessorData(const QJsonObject &json);
111
112 QString bufferViewName;
113 int bufferViewIndex;
114 QAttribute::VertexBaseType type;
115 uint dataSize;
116 int count;
117 int offset;
118 int stride;
119 };
120
121 struct Gltf1
122 {
123 QHash<QString, AccessorData> m_accessorDict;
124 QHash<QString, BufferData> m_bufferDatas;
125 QHash<QString, Qt3DRender::QBuffer*> m_buffers;
126 };
127
128 struct Gltf2
129 {
130 QVector<BufferData> m_bufferDatas;
131 QVector<Qt3DRender::QBuffer*> m_buffers;
132 QVector<AccessorData> m_accessors;
133 };
134
135 Q_OBJECT
136public:
137 GLTFGeometryLoader();
138 ~GLTFGeometryLoader();
139
140 QGeometry *geometry() const final;
141
142 bool load(QIODevice *ioDev, const QString &subMesh = QString()) final;
143
144protected:
145 void setBasePath(const QString &path);
146 bool setJSON(const QJsonDocument &json);
147
148 static QString standardAttributeNameFromSemantic(const QString &semantic);
149
150 void parse();
151 void parseGLTF1();
152 void parseGLTF2();
153 void cleanup();
154
155 void processJSONBuffer(const QString &id, const QJsonObject &json);
156 void processJSONBufferView(const QString &id, const QJsonObject &json);
157 void processJSONAccessor(const QString &id, const QJsonObject &json);
158 void processJSONMesh(const QString &id, const QJsonObject &json);
159
160 void loadBufferData();
161 void unloadBufferData();
162
163 void processJSONBufferV2(const QJsonObject &json);
164 void processJSONBufferViewV2(const QJsonObject &json);
165 void processJSONAccessorV2(const QJsonObject &json);
166 void processJSONMeshV2(const QJsonObject &json);
167
168 void loadBufferDataV2();
169 void unloadBufferDataV2();
170
171 QByteArray resolveLocalData(const QString &path) const;
172
173 static QAttribute::VertexBaseType accessorTypeFromJSON(int componentType);
174 static uint accessorDataSizeFromJson(const QString &type);
175
176private:
177 QJsonDocument m_json;
178 QString m_basePath;
179 QString m_mesh;
180
181 Gltf1 m_gltf1;
182 Gltf2 m_gltf2;
183
184 QGeometry *m_geometry;
185};
186
187} // namespace Qt3DRender
188
189QT_END_NAMESPACE
190
191#endif // GLTFGEOMETRYLOADER_H
192

source code of qt3d/src/plugins/geometryloaders/gltf/gltfgeometryloader.h