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Header only C++ tiny glTF library(loader/saver).

TinyGLTF is a header only C++11 glTF 2.0 https://github.com/KhronosGroup/glTF library.

Status

Work in process(devel branch). Very near to release, but need more tests and examples.

TinyGLTF uses Niels Lohmann's json library(https://github.com/nlohmann/json), so now it requires C++11 compiler. If you are looking for old, C++03 version, please use devel-picojson branch.

Builds

Features

Written in portable C++. C++-11 with STL dependency only.
- macOS + clang(LLVM)
- iOS + clang
- Linux + gcc/clang
- Windows + MinGW
- Windows + Visual Studio 2015 or later.
  - Visual Studio 2013 is not supported since they have limited C++11 support and failed to compile json.hpp.
- Android + CrystaX(NDK drop-in replacement) GCC
- Web using Emscripten(LLVM)
Moderate parsing time and memory consumption.
glTF specification v2.0.0
- ASCII glTF
- Binary glTF(GLB)
- PBR material description
Buffers
- Parse BASE64 encoded embedded buffer fata(DataURI).
- Load .bin file.
Image(Using stb_image)
- Parse BASE64 encoded embedded image fata(DataURI).
- Load external image file.
- PNG(8bit only)
- JPEG(8bit only)
- BMP
- GIF

Examples

glview : Simple glTF geometry viewer.
validator : Simple glTF validator with JSON schema.

TODOs

Write C++ code generator from json schema for robust parsing.
Serialization
Compression/decompression(Open3DGC, etc)
Support extensions and extras property
HDR image?
Write tests for animation and skin

Licenses

TinyGLTF is licensed under MIT license.

TinyGLTF uses the following third party libraries.

json.hpp : Copyright (c) 2013-2017 Niels Lohmann. MIT license.
base64 : Copyright (C) 2004-2008 René Nyffenegger
stb_image.h : v2.08 - public domain image loader - http://nothings.org/stb_image.h

Build and example

Copy stb_image.h, json.hpp and tiny_gltf.h to your project.

Loading glTF 2.0 model

// Define these only in *one* .cc file.
#define TINYGLTF_IMPLEMENTATION
#define STB_IMAGE_IMPLEMENTATION
// #define TINYGLTF_NOEXCEPTION // optional. disable exception handling.
#include "tiny_gltf.h"

using namespace tinygltf;

Model model; 
TinyGLTF loader;
std::string err;
  
bool ret = loader.LoadASCIIFromFile(&model, &err, argv[1]);
//bool ret = loader.LoadBinaryFromFile(&model, &err, argv[1]); // for binary glTF(.glb) 
if (!err.empty()) {
  printf("Err: %s\n", err.c_str());
}

if (!ret) {
  printf("Failed to parse glTF\n");
  return -1;
}

Compile options

TINYGLTF_NOEXCEPTION : Disable C++ exception in JSON parsing. You can use -fno-exceptions or by defining the symbol JSON_NOEXCEPTION and TINYGLTF_NOEXCEPTION to fully remove C++ exception codes when compiling TinyGLTF.
TINYGLTF_NO_STB_IMAGE : Do not load images with stb_image. Instead use TinyGLTF::SetImageLoader(LoadimageDataFunction LoadImageData, void *user_data) to set a callback for loading images.

Saving gltTF 2.0 model

T.B.W.

Running tests.

glTF parsing test

Setup

Python 2.6 or 2.7 required. Git clone https://github.com/KhronosGroup/glTF-Sample-Models to your local dir.

Run parsing test

After building loader_example, edit test_runner.py, then,

$ python test_runner.py

Unit tests

$ cd tests
$ make
$ ./tester
$ ./tester_noexcept

Third party licenses

json.hpp : Licensed under the MIT License http://opensource.org/licenses/MIT. Copyright (c) 2013-2017 Niels Lohmann http://nlohmann.me.
stb_image : Public domain.

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