Add build option with draco in Makefile.

Merge pull request #154 from Ybalrid/patch-3
Fix the display of the version history
2026-06-08 19:23:50 +00:00 · 2019-03-08 14:01:06 +09:00 · 2019-03-08 13:32:31 +09:00 · 2019-03-07 19:40:57 +01:00 · 2019-03-07 21:30:20 +09:00 · 2019-03-07 13:23:59 +01:00
55 changed files with 25268 additions and 7373 deletions
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,15 +7,15 @@ matrix:
        sources:
        - george-edison55-precise-backports
        - ubuntu-toolchain-r-test
-        - llvm-toolchain-precise-3.7
+        - llvm-toolchain-trusty-3.9
        packages:
        - g++-4.9
-        - clang-3.7
+        - clang-3.9
    compiler: clang
-    env: COMPILER_VERSION=3.7 BUILD_TYPE=Debug
+    env: COMPILER_VERSION=3.9 BUILD_TYPE=Debug
  - addons: *1
    compiler: clang
-    env: COMPILER_VERSION=3.7 BUILD_TYPE=Release
+    env: COMPILER_VERSION=3.9 BUILD_TYPE=Release
  - addons: &2
      apt:
        sources:
@@ -30,7 +30,7 @@ matrix:
    env: COMPILER_VERSION=4.9 BUILD_TYPE=Release EXTRA_CXXFLAGS="-fsanitize=address"
  - addons: *1
    compiler: clang
-    env: COMPILER_VERSION=3.7 BUILD_TYPE=Debug CFLAGS="-O0" CXXFLAGS="-O0"
+    env: COMPILER_VERSION=3.9 BUILD_TYPE=Debug CFLAGS="-O0" CXXFLAGS="-O0"

 before_install:
  - ./.travis-before-install.sh
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -0,0 +1,28 @@
+cmake_minimum_required(VERSION 3.6)
+
+PROJECT (tinygltf)
+
+SET(CMAKE_CXX_STANDARD 11)
+
+ADD_EXECUTABLE ( loader_example
+  loader_example.cc
+  )
+
+ADD_SUBDIRECTORY ( examples/gltfutil )
+ADD_SUBDIRECTORY ( examples/glview )
+ADD_SUBDIRECTORY ( examples/validator )
+
+INSTALL ( FILES
+  json.hpp
+  stb_image.h
+  stb_image_write.h
+  tiny_gltf.h
+  DESTINATION
+  include
+  )
+
+INSTALL ( FILES
+  cmake/TinyGLTFConfig.cmake
+  DESTINATION
+  cmake
+  )
--- a/10
+++ b/10
@@ -1,9 +1,13 @@

 # Use this for strict compilation check(will work on clang 3.8+)
-#EXTRA_CXXFLAGS := -fsanitize=address -Wall -Werror -Weverything -Wno-c++11-long-long
+#EXTRA_CXXFLAGS := -fsanitize=address -Wall -Werror -Weverything -Wno-c++11-long-long -Wno-c++98-compat
+
+# With draco
+# EXTRA_CXXFLAGS := -I../draco/src/ -I../draco/build -DTINYGLTF_ENABLE_DRACO -L../draco/build
+# EXTRA_LINKFLAGS := -L../draco/build/ -ldracodec -ldraco

 all:
-	clang++  $(EXTRA_CXXFLAGS) -std=c++11 -g -O0 -o loader_example loader_example.cc
+	clang++  $(EXTRA_CXXFLAGS) -std=c++11 -g -O0 -o loader_example loader_example.cc $(EXTRA_LINKFLAGS)

 lint:
-	./cpplint.py tiny_gltf_loader.h
+	deps/cpplint.py tiny_gltf.h
--- a/README.md
+++ b/README.md
@@ -2,12 +2,14 @@

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

+`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.
+
 ## 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.  
+ - v2.2.0 release(Support loading 16bit PNG. Sparse accessor support)
+ - v2.1.0 release(Draco support)
+ - v2.0.0 release(22 Aug, 2018)!

 ## Builds

@@ -22,8 +24,9 @@ If you are looking for old, C++03 version, please use `devel-picojson` branch.
  * [x] iOS + clang
  * [x] Linux + gcc/clang
  * [x] Windows + MinGW
-  * [x] Windows + Visual Studio 2015 or later.
+  * [x] Windows + Visual Studio 2015 Update 3 or later.
    * Visual Studio 2013 is not supported since they have limited C++11 support and failed to compile `json.hpp`.
+  * [x] Android NDK
  * [x] Android + CrystaX(NDK drop-in replacement) GCC
  * [x] Web using Emscripten(LLVM)
 * Moderate parsing time and memory consumption.
@@ -32,23 +35,34 @@ If you are looking for old, C++03 version, please use `devel-picojson` branch.
  * [x] Binary glTF(GLB)
  * [x] PBR material description
 * Buffers
-  * [x] Parse BASE64 encoded embedded buffer fata(DataURI).
+  * [x] Parse BASE64 encoded embedded buffer data(DataURI).
  * [x] Load `.bin` file.
 * Image(Using stb_image)
-  * [x] Parse BASE64 encoded embedded image fata(DataURI).
+  * [x] Parse BASE64 encoded embedded image data(DataURI).
  * [x] Load external image file.
-  * [x] PNG(8bit only)
-  * [x] JPEG(8bit only)
-  * [x] BMP
-  * [x] GIF
+  * [x] Load PNG(8bit and 16bit)
+  * [x] Load JPEG(8bit only)
+  * [x] Load BMP
+  * [x] Load GIF
+  * [x] Custom Image decoder callback(e.g. for decoding OpenEXR image)
+* Morph traget
+  * [x] Sparse accessor
+* Load glTF from memory
+* Custom callback handler
+  * [x] Image load
+  * [x] Image save
+* Extensions
+  * [x] Draco mesh decoding

 ## Examples

 * [glview](examples/glview) : Simple glTF geometry viewer.
 * [validator](examples/validator) : Simple glTF validator with JSON schema.
+* [basic](examples/basic) : Basic glTF viewer with texturing support.

 ## Projects using TinyGLTF

+* px_render Single header C++ Libraries for Thread Scheduling, Rendering, and so on... https://github.com/pplux/px
 * Physical based rendering with Vulkan using glTF 2.0 models https://github.com/SaschaWillems/Vulkan-glTF-PBR
 * GLTF loader plugin for OGRE 2.1. Support for PBR materials via HLMS/PBS https://github.com/Ybalrid/Ogre_glTF
 * [TinyGltfImporter](http://doc.magnum.graphics/magnum/classMagnum_1_1Trade_1_1TinyGltfImporter.html) plugin for [Magnum](https://github.com/mosra/magnum), a lightweight and modular C++11/C++14 graphics middleware for games and data visualization.
@@ -56,13 +70,16 @@ If you are looking for old, C++03 version, please use `devel-picojson` branch.

 ## TODOs

-* [ ] Write C++ code generator from jSON schema for robust parsing.
-* [x] Serialization
-* [ ] Compression/decompression(Open3DGC, etc)
+* [ ] Write C++ code generator which emits C++ code from JSON schema for robust parsing.
+* [ ] Mesh Compression/decompression(Open3DGC, etc)
+  * [x] Load Draco compressed mesh
+  * [ ] Save Draco compressed mesh
+  * [ ] Open3DGC?
 * [ ] Support `extensions` and `extras` property
 * [ ] HDR image?
  * [ ] OpenEXR extension through TinyEXR.
-* [ ] Write tests for `animation` and `skin` 
+* [ ] 16bit PNG support in Serialization
+* [ ] Write example and tests for `animation` and `skin`

 ## Licenses

@@ -92,12 +109,18 @@ Copy `stb_image.h`, `stb_image_write.h`, `json.hpp` and `tiny_gltf.h` to your pr

 using namespace tinygltf;

-Model model; 
+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) 
+std::string warn;
+
+bool ret = loader.LoadASCIIFromFile(&model, &err, &warn, argv[1]);
+//bool ret = loader.LoadBinaryFromFile(&model, &err, &warn, argv[1]); // for binary glTF(.glb)
+
+if (!warn.empty()) {
+  printf("Warn: %s\n", warn.c_str());
+}
+
 if (!err.empty()) {
  printf("Err: %s\n", err.c_str());
 }
@@ -113,6 +136,13 @@ if (!ret) {
 * `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.
 * `TINYGLTF_NO_STB_IMAGE_WRITE` : Do not write images with stb_image_write. Instead use `TinyGLTF::SetImageWriter(WriteimageDataFunction WriteImageData, void *user_data)` to set a callback for writing images.
+* `TINYGLTF_NO_EXTERNAL_IMAGE` : Do not try to load external image file. This option would be helpful if you do not want to load image files during glTF parsing.
+* `TINYGLTF_ANDROID_LOAD_FROM_ASSETS`: Load all files from packaged app assets instead of the regular file system. **Note:** You must pass a valid asset manager from your android app to `tinygltf::asset_manager` beforehand.
+* `TINYGLTF_ENABLE_DRACO`: Enable Draco compression. User must provide include path and link correspnding libraries in your project file.
+* `TINYGLTF_NO_INCLUDE_JSON `: Disable including `json.hpp` from within `tiny_gltf.h` because it has been already included before or you want to include it using custom path before including `tiny_gltf.h`.
+* `TINYGLTF_NO_INCLUDE_STB_IMAGE `: Disable including `stb_image.h` from within `tiny_gltf.h` because it has been already included before or you want to include it using custom path before including `tiny_gltf.h`.
+* `TINYGLTF_NO_INCLUDE_STB_IMAGE_WRITE `: Disable including `stb_image_write.h` from within `tiny_gltf.h` because it has been already included before or you want to include it using custom path before including `tiny_gltf.h`.
+

 ### Saving gltTF 2.0 model
 * [ ] Buffers.
--- a/cmake/TinyGLTFConfig.cmake
+++ b/cmake/TinyGLTFConfig.cmake
@@ -0,0 +1,15 @@
+# -*- cmake -*-
+# - Find TinyGLTF
+
+# TinyGLTF_INCLUDE_DIR      TinyGLTF's include directory
+
+
+FIND_PACKAGE ( PackageHandleStandardArgs )
+
+SET ( TinyGLTF_INCLUDE_DIR "${TinyGLTF_DIR}/../include" CACHE STRING "TinyGLTF include directory")
+
+FIND_FILE ( TinyGLTF_HEADER tiny_gltf.h PATHS ${TinyGLTF_INCLUDE_DIR} )
+
+IF (NOT TinyGLTF_HEADER)
+  MESSAGE ( FATAL_ERROR "Unable to find tiny_gltf.h, TinyGLTF_INCLUDE_DIR = ${TinyGLTF_INCLUDE_DIR}")
+ENDIF ()
--- a/examples/basic/.gitignore
+++ b/examples/basic/.gitignore
@@ -0,0 +1,7 @@
+.vs
+Debug
+x64
+packages
+
+!*.sln
+!*.vcxproj*
--- a/examples/basic/README.md
+++ b/examples/basic/README.md
@@ -0,0 +1,21 @@
+# Basic glTF viewer
+
+## Requirements
+
+* glew
+* glfw3
+* premake5(linux)
+* OpenGL 3.3+ GPU
+
+## Build on Linux and macOS
+
+```
+$ premake5 gmake
+$ make
+```
+
+## Build on Visual Studio
+
+Plese use solution file located at `basic` folder.
+
+
--- a/examples/basic/basic/basic.sln
+++ b/examples/basic/basic/basic.sln
@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28010.2050
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "basic", "basic.vcxproj", "{0589AC44-0CF3-40D8-8D89-68393CFD40F3}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{0589AC44-0CF3-40D8-8D89-68393CFD40F3}.Debug|x64.ActiveCfg = Debug|x64
+		{0589AC44-0CF3-40D8-8D89-68393CFD40F3}.Debug|x64.Build.0 = Debug|x64
+		{0589AC44-0CF3-40D8-8D89-68393CFD40F3}.Debug|x86.ActiveCfg = Debug|Win32
+		{0589AC44-0CF3-40D8-8D89-68393CFD40F3}.Debug|x86.Build.0 = Debug|Win32
+		{0589AC44-0CF3-40D8-8D89-68393CFD40F3}.Release|x64.ActiveCfg = Release|x64
+		{0589AC44-0CF3-40D8-8D89-68393CFD40F3}.Release|x64.Build.0 = Release|x64
+		{0589AC44-0CF3-40D8-8D89-68393CFD40F3}.Release|x86.ActiveCfg = Release|Win32
+		{0589AC44-0CF3-40D8-8D89-68393CFD40F3}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {055E97C4-43DC-41B4-8D61-4FDDBC7B1EF7}
+	EndGlobalSection
+EndGlobal
--- a/examples/basic/basic/basic.vcxproj
+++ b/examples/basic/basic/basic.vcxproj
@@ -0,0 +1,159 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>15.0</VCProjectVersion>
+    <ProjectGuid>{0589AC44-0CF3-40D8-8D89-68393CFD40F3}</ProjectGuid>
+    <RootNamespace>basic</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0.17134.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup />
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies);opengl32.lib</AdditionalDependencies>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies);opengl32.lib</AdditionalDependencies>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalDependencies>kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies);opengl32.lib</AdditionalDependencies>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalDependencies>kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies);opengl32.lib</AdditionalDependencies>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\main.cpp" />
+    <ClCompile Include="..\shaders.cpp" />
+    <ClCompile Include="..\window.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\shaders.h" />
+    <ClInclude Include="..\window.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+    <Import Project="packages\nupengl.core.redist.0.1.0.1\build\native\nupengl.core.redist.targets" Condition="Exists('packages\nupengl.core.redist.0.1.0.1\build\native\nupengl.core.redist.targets')" />
+    <Import Project="packages\nupengl.core.0.1.0.1\build\native\nupengl.core.targets" Condition="Exists('packages\nupengl.core.0.1.0.1\build\native\nupengl.core.targets')" />
+    <Import Project="packages\glm.0.9.9.200\build\native\glm.targets" Condition="Exists('packages\glm.0.9.9.200\build\native\glm.targets')" />
+  </ImportGroup>
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('packages\nupengl.core.redist.0.1.0.1\build\native\nupengl.core.redist.targets')" Text="$([System.String]::Format('$(ErrorText)', 'packages\nupengl.core.redist.0.1.0.1\build\native\nupengl.core.redist.targets'))" />
+    <Error Condition="!Exists('packages\nupengl.core.0.1.0.1\build\native\nupengl.core.targets')" Text="$([System.String]::Format('$(ErrorText)', 'packages\nupengl.core.0.1.0.1\build\native\nupengl.core.targets'))" />
+    <Error Condition="!Exists('packages\glm.0.9.9.200\build\native\glm.targets')" Text="$([System.String]::Format('$(ErrorText)', 'packages\glm.0.9.9.200\build\native\glm.targets'))" />
+  </Target>
+</Project>
--- a/examples/basic/basic/basic.vcxproj.filters
+++ b/examples/basic/basic/basic.vcxproj.filters
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;ipp;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\main.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\window.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\shaders.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\window.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\shaders.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+</Project>
--- a/examples/basic/basic/basic.vcxproj.user
+++ b/examples/basic/basic/basic.vcxproj.user
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup />
+</Project>
--- a/examples/basic/basic/packages.config
+++ b/examples/basic/basic/packages.config
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="glm" version="0.9.9.200" targetFramework="native" />
+  <package id="nupengl.core" version="0.1.0.1" targetFramework="native" />
+  <package id="nupengl.core.redist" version="0.1.0.1" targetFramework="native" />
+</packages>
--- a/examples/basic/main.cpp
+++ b/examples/basic/main.cpp
@@ -0,0 +1,365 @@
+#include <fstream>
+#include <iostream>
+
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+#include <glm/gtc/matrix_transform.hpp>
+
+#include "shaders.h"
+#include "window.h"
+
+#define TINYGLTF_IMPLEMENTATION
+#define STB_IMAGE_IMPLEMENTATION
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#define TINYGLTF_NOEXCEPTION
+#define JSON_NOEXCEPTION
+#include "../../tiny_gltf.h"
+
+#define BUFFER_OFFSET(i) ((char *)NULL + (i))
+
+bool loadModel(tinygltf::Model &model, const char *filename) {
+  tinygltf::TinyGLTF loader;
+  std::string err;
+  std::string warn;
+
+  bool res = loader.LoadASCIIFromFile(&model, &err, &warn, filename);
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
+
+  if (!err.empty()) {
+    std::cout << "ERR: " << err << std::endl;
+  }
+
+  if (!res)
+    std::cout << "Failed to load glTF: " << filename << std::endl;
+  else
+    std::cout << "Loaded glTF: " << filename << std::endl;
+
+  return res;
+}
+
+std::map<int, GLuint> bindMesh(std::map<int, GLuint> vbos,
+                               tinygltf::Model &model, tinygltf::Mesh &mesh) {
+  for (size_t i = 0; i < model.bufferViews.size(); ++i) {
+    const tinygltf::BufferView &bufferView = model.bufferViews[i];
+    if (bufferView.target == 0) {  // TODO impl drawarrays
+      std::cout << "WARN: bufferView.target is zero" << std::endl;
+      continue;  // Unsupported bufferView.
+                 /*
+                   From spec2.0 readme:
+                   https://github.com/KhronosGroup/glTF/tree/master/specification/2.0
+                            ... drawArrays function should be used with a count equal to
+                   the count            property of any of the accessors referenced by the
+                   attributes            property            (they are all equal for a given
+                   primitive).
+                 */
+    }
+
+    tinygltf::Buffer buffer = model.buffers[bufferView.buffer];
+    std::cout << "bufferview.target " << bufferView.target << std::endl;
+
+    GLuint vbo;
+    glGenBuffers(1, &vbo);
+    vbos[i] = vbo;
+    glBindBuffer(bufferView.target, vbo);
+
+    std::cout << "buffer.data.size = " << buffer.data.size()
+              << ", bufferview.byteOffset = " << bufferView.byteOffset
+              << std::endl;
+
+    glBufferData(bufferView.target, bufferView.byteLength,
+                 &buffer.data.at(0) + bufferView.byteOffset, GL_STATIC_DRAW);
+  }
+
+  for (size_t i = 0; i < mesh.primitives.size(); ++i) {
+    tinygltf::Primitive primitive = mesh.primitives[i];
+    tinygltf::Accessor indexAccessor = model.accessors[primitive.indices];
+
+    for (auto &attrib : primitive.attributes) {
+      tinygltf::Accessor accessor = model.accessors[attrib.second];
+      int byteStride =
+          accessor.ByteStride(model.bufferViews[accessor.bufferView]);
+      glBindBuffer(GL_ARRAY_BUFFER, vbos[accessor.bufferView]);
+
+      int size = 1;
+      if (accessor.type != TINYGLTF_TYPE_SCALAR) {
+        size = accessor.type;
+      }
+
+      int vaa = -1;
+      if (attrib.first.compare("POSITION") == 0) vaa = 0;
+      if (attrib.first.compare("NORMAL") == 0) vaa = 1;
+      if (attrib.first.compare("TEXCOORD_0") == 0) vaa = 2;
+      if (vaa > -1) {
+        glEnableVertexAttribArray(vaa);
+        glVertexAttribPointer(vaa, size, accessor.componentType,
+                              accessor.normalized ? GL_TRUE : GL_FALSE,
+                              byteStride, BUFFER_OFFSET(accessor.byteOffset));
+      } else
+        std::cout << "vaa missing: " << attrib.first << std::endl;
+    }
+
+    GLuint texid;
+    glGenTextures(1, &texid);
+
+    tinygltf::Texture &tex = model.textures[0];
+    tinygltf::Image &image = model.images[tex.source];
+
+    glBindTexture(GL_TEXTURE_2D, texid);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+    GLenum format = GL_RGBA;
+
+    if (image.component == 1) {
+      format = GL_RED;
+    } else if (image.component == 2) {
+      format = GL_RG;
+    } else if (image.component == 3) {
+      format = GL_RGB;
+    } else {
+      // ???
+    }
+
+    GLenum type = GL_UNSIGNED_BYTE;
+    if (image.bits == 8) {
+      // ok
+    } else if (image.bits == 16) {
+      type = GL_UNSIGNED_SHORT;
+    } else {
+      // ???
+    }
+
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.width, image.height, 0,
+                 format, type, &image.image.at(0));
+  }
+
+  return vbos;
+}
+
+// bind models
+void bindModelNodes(std::map<int, GLuint> vbos, tinygltf::Model &model,
+                    tinygltf::Node &node) {
+  bindMesh(vbos, model, model.meshes[node.mesh]);
+  for (size_t i = 0; i < node.children.size(); i++) {
+    bindModelNodes(vbos, model, model.nodes[node.children[i]]);
+  }
+}
+GLuint bindModel(tinygltf::Model &model) {
+  std::map<int, GLuint> vbos;
+  GLuint vao;
+  glGenVertexArrays(1, &vao);
+  glBindVertexArray(vao);
+
+  const tinygltf::Scene &scene = model.scenes[model.defaultScene];
+  for (size_t i = 0; i < scene.nodes.size(); ++i) {
+    bindModelNodes(vbos, model, model.nodes[scene.nodes[i]]);
+  }
+
+  glBindVertexArray(0);
+  // cleanup vbos
+  for (size_t i = 0; i < vbos.size(); ++i) {
+    glDeleteBuffers(1, &vbos[i]);
+  }
+
+  return vao;
+}
+
+void drawMesh(tinygltf::Model &model, tinygltf::Mesh &mesh) {
+  for (size_t i = 0; i < mesh.primitives.size(); ++i) {
+    tinygltf::Primitive primitive = mesh.primitives[i];
+    tinygltf::Accessor indexAccessor = model.accessors[primitive.indices];
+
+    glDrawElements(primitive.mode, indexAccessor.count,
+                   indexAccessor.componentType,
+                   BUFFER_OFFSET(indexAccessor.byteOffset));
+  }
+}
+
+// recursively draw node and children nodes of model
+void drawModelNodes(tinygltf::Model &model, tinygltf::Node &node) {
+  drawMesh(model, model.meshes[node.mesh]);
+  for (size_t i = 0; i < node.children.size(); i++) {
+    drawModelNodes(model, model.nodes[node.children[i]]);
+  }
+}
+void drawModel(GLuint vao, tinygltf::Model &model) {
+  glBindVertexArray(vao);
+
+  const tinygltf::Scene &scene = model.scenes[model.defaultScene];
+  for (size_t i = 0; i < scene.nodes.size(); ++i) {
+    drawModelNodes(model, model.nodes[scene.nodes[i]]);
+  }
+
+  glBindVertexArray(0);
+}
+
+void dbgModel(tinygltf::Model &model) {
+  for (auto &mesh : model.meshes) {
+    std::cout << "mesh : " << mesh.name << std::endl;
+    for (auto &primitive : mesh.primitives) {
+      const tinygltf::Accessor &indexAccessor =
+          model.accessors[primitive.indices];
+
+      std::cout << "indexaccessor: count " << indexAccessor.count << ", type "
+                << indexAccessor.componentType << std::endl;
+
+      tinygltf::Material &mat = model.materials[primitive.material];
+      for (auto &mats : mat.values) {
+        std::cout << "mat : " << mats.first.c_str() << std::endl;
+      }
+
+      for (auto &image : model.images) {
+        std::cout << "image name : " << image.uri << std::endl;
+        std::cout << "  size : " << image.image.size() << std::endl;
+        std::cout << "  w/h : " << image.width << "/" << image.height
+                  << std::endl;
+      }
+
+      std::cout << "indices : " << primitive.indices << std::endl;
+      std::cout << "mode     : "
+                << "(" << primitive.mode << ")" << std::endl;
+
+      for (auto &attrib : primitive.attributes) {
+        std::cout << "attribute : " << attrib.first.c_str() << std::endl;
+      }
+    }
+  }
+}
+
+glm::mat4 genView(glm::vec3 pos, glm::vec3 lookat) {
+  // Camera matrix
+  glm::mat4 view = glm::lookAt(
+      pos,                // Camera in World Space
+      lookat,             // and looks at the origin
+      glm::vec3(0, 1, 0)  // Head is up (set to 0,-1,0 to look upside-down)
+  );
+
+  return view;
+}
+
+glm::mat4 genMVP(glm::mat4 view_mat, glm::mat4 model_mat, float fov, int w,
+                 int h) {
+  glm::mat4 Projection =
+      glm::perspective(glm::radians(fov), (float)w / (float)h, 0.01f, 1000.0f);
+
+  // Or, for an ortho camera :
+  // glm::mat4 Projection = glm::ortho(-10.0f,10.0f,-10.0f,10.0f,0.0f,100.0f);
+  // // In world coordinates
+
+  glm::mat4 mvp = Projection * view_mat * model_mat;
+
+  return mvp;
+}
+
+void displayLoop(Window &window, const std::string &filename) {
+  Shaders shader = Shaders();
+  glUseProgram(shader.pid);
+
+  // grab uniforms to modify
+  GLuint MVP_u = glGetUniformLocation(shader.pid, "MVP");
+  GLuint sun_position_u = glGetUniformLocation(shader.pid, "sun_position");
+  GLuint sun_color_u = glGetUniformLocation(shader.pid, "sun_color");
+
+  tinygltf::Model model;
+  if (!loadModel(model, filename.c_str())) return;
+
+  GLuint vao = bindModel(model);
+  // dbgModel(model); return;
+
+  // Model matrix : an identity matrix (model will be at the origin)
+  glm::mat4 model_mat = glm::mat4(1.0f);
+  glm::mat4 model_rot = glm::mat4(1.0f);
+  glm::vec3 model_pos = glm::vec3(-3, 0, -3);
+
+  // generate a camera view, based on eye-position and lookAt world-position
+  glm::mat4 view_mat = genView(glm::vec3(2, 2, 20), model_pos);
+
+  glm::vec3 sun_position = glm::vec3(3.0, 10.0, -5.0);
+  glm::vec3 sun_color = glm::vec3(1.0);
+
+  while (!window.Close()) {
+    window.Resize();
+
+    glClearColor(0.2, 0.2, 0.2, 1.0);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glm::mat4 trans =
+        glm::translate(glm::mat4(1.0f), model_pos);  // reposition model
+    model_rot = glm::rotate(model_rot, glm::radians(0.8f),
+                            glm::vec3(0, 1, 0));  // rotate model on y axis
+    model_mat = trans * model_rot;
+
+    // build a model-view-projection
+    GLint w, h;
+    glfwGetWindowSize(window.window, &w, &h);
+    glm::mat4 mvp = genMVP(view_mat, model_mat, 45.0f, w, h);
+    glUniformMatrix4fv(MVP_u, 1, GL_FALSE, &mvp[0][0]);
+
+    glUniform3fv(sun_position_u, 1, &sun_position[0]);
+    glUniform3fv(sun_color_u, 1, &sun_color[0]);
+
+    drawModel(vao, model);
+    glfwSwapBuffers(window.window);
+    glfwPollEvents();
+  }
+}
+
+static void error_callback(int error, const char *description) {
+  (void)error;
+  fprintf(stderr, "Error: %s\n", description);
+}
+
+int main(int argc, char **argv) {
+  std::string filename = "../../models/Cube/Cube.gltf";
+
+  if (argc > 1) {
+    filename = argv[1];
+  }
+
+  glfwSetErrorCallback(error_callback);
+
+  if (!glfwInit()) return -1;
+
+  // Force create OpenGL 3.3
+  // NOTE(syoyo): Linux + NVIDIA driver segfaults for some reason? commenting out glfwWindowHint will work.
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+#ifdef __APPLE__
+  glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+#endif
+#endif
+
+  Window window = Window(800, 600, "TinyGLTF basic example");
+  glfwMakeContextCurrent(window.window);
+
+#ifdef __APPLE__
+  // https://stackoverflow.com/questions/50192625/openggl-segmentation-fault
+  glewExperimental = GL_TRUE;
+#endif
+
+  glewInit();
+  std::cout << glGetString(GL_RENDERER) << ", " << glGetString(GL_VERSION)
+            << std::endl;
+
+  if (!GLEW_VERSION_3_3) {
+    std::cerr << "OpenGL 3.3 is required to execute this app." << std::endl;
+    return EXIT_FAILURE;
+  }
+
+  glEnable(GL_DEPTH_TEST);
+  glDepthFunc(GL_LESS);
+
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+  glEnable(GL_BLEND);
+
+  displayLoop(window, filename);
+
+  glfwTerminate();
+  return 0;
+}
--- a/examples/basic/premake5.lua
+++ b/examples/basic/premake5.lua
@@ -0,0 +1,44 @@
+solution "basic_viewer"
+   -- location ( "build" )
+   configurations { "Debug", "Release" }
+   platforms {"native", "x64", "x32"}
+   
+   project "basic_viewer"
+
+      kind "ConsoleApp"
+      language "C++"
+	  cppdialect "C++11"
+      files { "main.cpp", "shaders.cpp", "window.cpp" }
+      includedirs { "./" }
+      includedirs { "../../" }
+      includedirs { "../common/glm" }
+
+      configuration { "linux" }
+         linkoptions { "`pkg-config --libs glfw3`" }
+         links { "GL", "GLU", "m", "GLEW", "X11", "Xrandr", "Xinerama", "Xi", "Xxf86vm", "Xcursor", "dl" }
+
+      configuration { "windows" }
+         -- Edit path to glew and GLFW3 fit to your environment.
+         includedirs { "../../../../local/glew-1.13.0/include/" }
+         includedirs { "../../../../local/glfw-3.2.bin.WIN32/include/" }
+         libdirs { "../../../../local/glew-1.13.0/lib/Release/Win32/" }
+         libdirs { "../../../../local/glfw-3.2.bin.WIN32/lib-vc2013/" }
+         links { "glfw3", "gdi32", "winmm", "user32", "glew32", "glu32","opengl32", "kernel32" }
+         defines { "_CRT_SECURE_NO_WARNINGS" }
+
+      configuration { "macosx" }
+         includedirs { "/usr/local/include" }
+         buildoptions { "-Wno-deprecated-declarations" }
+         libdirs { "/usr/local/lib" }
+         links { "glfw", "GLEW" }
+         linkoptions { "-framework OpenGL", "-framework Cocoa", "-framework IOKit", "-framework CoreVideo" }
+
+      configuration "Debug"
+         defines { "DEBUG" }
+		 symbols "On"
+		 warnings "Extra"
+
+      configuration "Release"
+         defines { "NDEBUG" }
+		 optimize "On"
+		 warnings "Extra"
--- a/examples/basic/screenshot.JPG
+++ b/examples/basic/screenshot.JPG
--- a/examples/basic/shaders.cpp
+++ b/examples/basic/shaders.cpp
@@ -0,0 +1,114 @@
+#include "shaders.h"
+#include <iostream>
+#include <vector>
+
+
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+
+std::string FragmentShaderCode =
+"#version 330 core\n\
+in vec3 normal;\n\
+in vec3 position;\n\
+in vec2 texcoord;\n\
+\n\
+uniform sampler2D tex;\n\
+uniform vec3 sun_position; \n\
+uniform vec3 sun_color; \n\
+\n\
+out vec4 color;\n\
+void main() {\n\
+	float lum = max(dot(normal, normalize(sun_position)), 0.0);\n\
+	color = texture(tex, texcoord) * vec4((0.3 + 0.7 * lum) * sun_color, 1.0);\n\
+}\n\
+";
+
+std::string VertexShaderCode =
+"#version 330 core\n\
+layout(location = 0) in vec3 in_vertex;\n\
+layout(location = 1) in vec3 in_normal;\n\
+layout(location = 2) in vec2 in_texcoord;\n\
+\n\
+uniform mat4 MVP;\n\
+\n\
+out vec3 normal;\n\
+out vec3 position;\n\
+out vec2 texcoord;\n\
+\n\
+void main(){\n\
+	gl_Position = MVP * vec4(in_vertex, 1);\n\
+	position = gl_Position.xyz;\n\
+	normal = normalize(mat3(MVP) * in_normal);\n\
+	position = in_vertex;\n\
+	texcoord = in_texcoord;\n\
+}";
+
+
+Shaders::Shaders()
+{
+
+	// Create the shaders
+	GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
+	GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
+
+
+	GLint Result = GL_FALSE;
+	int InfoLogLength;
+
+	// Compile Vertex Shader
+	char const * VertexSourcePointer = VertexShaderCode.c_str();
+	glShaderSource(VertexShaderID, 1, &VertexSourcePointer, NULL);
+	glCompileShader(VertexShaderID);
+
+	// Check Vertex Shader
+	glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
+	glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+	if (InfoLogLength > 0) {
+		std::vector<char> VertexShaderErrorMessage(InfoLogLength + 1);
+		glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
+		printf("%s\n", &VertexShaderErrorMessage[0]);
+	}
+
+	// Compile Fragment Shader
+	char const * FragmentSourcePointer = FragmentShaderCode.c_str();
+	glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer, NULL);
+	glCompileShader(FragmentShaderID);
+
+	// Check Fragment Shader
+	glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
+	glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+	if (InfoLogLength > 0) {
+		std::vector<char> FragmentShaderErrorMessage(InfoLogLength + 1);
+		glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
+		printf("%s\n", &FragmentShaderErrorMessage[0]);
+	}
+
+	// Link the program
+	printf("Linking program\n");
+	GLuint ProgramID = glCreateProgram();
+	glAttachShader(ProgramID, VertexShaderID);
+	glAttachShader(ProgramID, FragmentShaderID);
+	glLinkProgram(ProgramID);
+
+	// Check the program
+	glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
+	glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+	if (InfoLogLength > 0) {
+		std::vector<char> ProgramErrorMessage(InfoLogLength + 1);
+		glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
+		printf("%s\n", &ProgramErrorMessage[0]);
+	}
+
+	glDetachShader(ProgramID, VertexShaderID);
+	glDetachShader(ProgramID, FragmentShaderID);
+
+	glDeleteShader(VertexShaderID);
+	glDeleteShader(FragmentShaderID);
+
+	this->pid = ProgramID;
+}
+
+
+Shaders::~Shaders()
+{
+}
--- a/examples/basic/shaders.h
+++ b/examples/basic/shaders.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+
+class Shaders
+{
+public:
+	GLuint pid;
+	Shaders();
+	~Shaders();
+};
+
--- a/examples/basic/window.cpp
+++ b/examples/basic/window.cpp
@@ -0,0 +1,27 @@
+#include "window.h"
+
+
+
+Window::Window(int x, int y, const char* title)
+{
+	GLFWwindow* window = glfwCreateWindow(x, y, title, NULL, NULL);
+	this->window = window;
+}
+
+
+Window::~Window()
+{
+	glfwDestroyWindow(this->window);
+}
+
+void Window::Resize() 
+{
+	GLint w, h;
+	glfwGetWindowSize(this->window, &w, &h);
+	glViewport(0, 0, w, h);
+}
+
+int Window::Close()
+{
+	return glfwWindowShouldClose(this->window);
+}
--- a/examples/basic/window.h
+++ b/examples/basic/window.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <GLFW/glfw3.h>
+
+class Window
+{
+public:
+	GLFWwindow* window;
+
+	Window(int x, int y, const char* title);
+	~Window();
+	void Resize();
+	int Close();
+};
+
--- a/examples/common/LICENSE.lodepng
+++ b/examples/common/LICENSE.lodepng
@@ -0,0 +1,21 @@
+Copyright (c) 2005-2018 Lode Vandevenne
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+    
--- a/examples/common/lodepng.cpp
+++ b/examples/common/lodepng.cpp
--- a/examples/common/lodepng.h
+++ b/examples/common/lodepng.h
--- a/examples/common/tinyexr.h
+++ b/examples/common/tinyexr.h
--- a/examples/gltfutil/CMakeLists.txt
+++ b/examples/gltfutil/CMakeLists.txt
@@ -4,6 +4,13 @@ project(gltfutil)
 set(CMAKE_CXX_STANDARD 11)

 include_directories(../../)
+include_directories(../common/)

 file(GLOB gltfutil_sources *.cc *.h)
-add_executable(gltfutil ${gltfutil_sources})
+add_executable(gltfutil ${gltfutil_sources} ../common/lodepng.cpp)
+
+install ( TARGETS
+  gltfutil
+  DESTINATION
+  bin
+  )
--- a/examples/gltfutil/gltfuilconfig.h
+++ b/examples/gltfutil/gltfuilconfig.h
@@ -49,6 +49,7 @@ struct configuration {
  cli_action action = cli_action::not_set;
  texture_dumper::texture_output_format requested_format =
      texture_dumper::texture_output_format::not_specified;
+  bool use_exr = false;

  bool has_output_dir;
  bool is_valid() {
--- a/examples/gltfutil/main.cc
+++ b/examples/gltfutil/main.cc
@@ -11,6 +11,9 @@
 #define STB_IMAGE_WRITE_IMPLEMENTATION
 #include "stb_image_write.h"

+#define TINYEXR_IMPLEMENTATION
+#include "tinyexr.h"
+
 namespace gltfutil {
 int usage(int ret = 0) {
  using std::cout;
@@ -20,8 +23,9 @@ int usage(int ret = 0) {
          "[path to output directory])\n\n"
       //<< "\t\t -i: start in interactive mode\n"
       << "\t\t -d: dump enclosed content (image assets)\n"
-       << "\t\t -f: file format for image output"
-       << "\t\t -o: ouptput directory path"
+       << "\t\t -f: file format for image output\n"
+       << "\t\t -o: ouptput directory path\n"
+       << "\t\t -e: Use OpenEXR format for 16bit image\n"
       << "\t\t -h: print this help\n";
  return ret;
 }
@@ -44,6 +48,9 @@ int parse_args(int argc, char** argv) {
          config.mode = ui_mode::cli;
          config.action = cli_action::dump;
          break;
+        case 'e':
+          config.use_exr = true;
+          break;
        case 'i':
          config.mode = ui_mode::interactive;
          break;
@@ -69,13 +76,14 @@ int parse_args(int argc, char** argv) {
    tinygltf::TinyGLTF loader;
    tinygltf::Model model;
    std::string error;
+    std::string warning;
    bool state;
    switch (detectType(config.input_path)) {
      case FileType::Ascii:
-        state = loader.LoadASCIIFromFile(&model, &error, config.input_path);
+        state = loader.LoadASCIIFromFile(&model, &error, &warning, config.input_path);
        break;
      case FileType::Binary:
-        state = loader.LoadBinaryFromFile(&model, &error, config.input_path);
+        state = loader.LoadBinaryFromFile(&model, &error, &warning, config.input_path);
        break;
      case FileType::Unknown:
      default:
@@ -96,6 +104,11 @@ int parse_args(int argc, char** argv) {

        case cli_action::dump: {
          texture_dumper dumper(model);
+
+          if (config.use_exr) {
+            dumper.set_use_exr(true);
+          }
+
          if (config.requested_format !=
              texture_dumper::texture_output_format::not_specified)
            dumper.set_output_format(config.requested_format);
--- a/examples/gltfutil/texture_dumper.cc
+++ b/examples/gltfutil/texture_dumper.cc
@@ -1,14 +1,84 @@
+#include <algorithm>
 #include <iostream>

 #include "stb_image_write.h"
 #include "texture_dumper.h"

+#include "lodepng.h"  // ../common
+
+#include "tinyexr.h"
+
 #include <tiny_gltf.h>

 using namespace gltfutil;
 using namespace tinygltf;
 using std::cout;

+static LodePNGColorType GetLodePNGColorType(int channels) {
+  if (channels == 1) {
+    return LodePNGColorType::LCT_GREY;
+  } else if (channels == 2) {
+    return LodePNGColorType::LCT_GREY_ALPHA;
+  } else if (channels == 3) {
+    return LodePNGColorType::LCT_RGB;
+  } else if (channels == 4) {
+    return LodePNGColorType::LCT_RGBA;
+  } else {
+    std::cerr << "??? unsupported channels " << channels << "\n";
+    return LodePNGColorType::LCT_RGB;  // FIXME(syoyo): Raise error
+  }
+}
+
+static void ToBigEndian(std::vector<uint8_t>* image) {
+
+  assert(image->size() % 2 == 0);
+
+  union {
+    unsigned int i;
+    char c[4];
+  } bint = {0x01020304};
+
+  bool is_big_endian = (bint.c[0] == 1);
+
+  if (is_big_endian) {
+    return;
+  }
+
+  uint16_t *ptr = reinterpret_cast<uint16_t *>(image->data());
+  size_t n = image->size() / 2;
+
+  for (size_t i = 0; i < n; i++) {
+    ptr[i] = ((0xFF00 & ptr[i]) >> 8) | ((0x00FF & ptr[i]) << 8);
+  }
+}
+
+static bool Save16bitImageAsEXR(const std::string& filename,
+                                const tinygltf::Image& image) {
+  assert(image.bits == 16);
+
+  std::vector<float> buf(image.width * image.height * image.component);
+
+  // widen to float image.
+  // Store as is(i.e, pixel value range is [0.0, 65535.0])
+  const unsigned short* ptr =
+      reinterpret_cast<const unsigned short*>(image.image.data());
+  for (size_t i = 0; i < image.width * image.height * image.component; i++) {
+    buf[i] = float(ptr[i]);
+  }
+
+  const char* err = nullptr;
+  int ret = SaveEXR(buf.data(), image.width, image.height, image.component,
+                    /* save_as_fp16 */ 0, filename.c_str(), &err);
+
+  if (err) {
+    std::cerr << "EXR err: " << err << std::endl;
+    FreeEXRErrorMessage(err);
+    return false;
+  }
+
+  return (ret == TINYEXR_SUCCESS);
+}
+
 texture_dumper::texture_dumper(const Model& input)
    : model(input), configured_format(texture_output_format::png) {
  cout << "Texture dumper\n";
@@ -25,26 +95,58 @@ void texture_dumper::dump_to_folder(const std::string& path) {
    cout << "image name is: \"" << image.name << "\"\n";
    cout << "image size is: " << image.width << 'x' << image.height << '\n';
    cout << "pixel channel count :" << image.component << '\n';
-    std::string name = image.name.empty() ? std::to_string(index) : image.name;
+    cout << "pixel bit depth :" << image.bits << '\n';
+    std::string basename =
+        image.name.empty() ? std::to_string(index) : image.name;

+    unsigned char* bytes_to_write =
+        const_cast<unsigned char*>(image.image.data());
+
+    std::string filename;
    switch (configured_format) {
      case texture_output_format::png:
-        name = path + "/" + name + ".png";
-        std::cout << "Image will be written to " << name << '\n';
-        stbi_write_png(name.c_str(), image.width, image.height, image.component,
-                       image.image.data(), 0);
+        filename = path + "/" + basename + ".png";
+
+        if (this->use_exr) {
+          if (image.pixel_type == TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT) {
+            filename = path + "/" + basename + ".exr";
+          }
+        }
+
+        std::cout << "Image will be written to " << filename << '\n';
+
+        if (image.pixel_type == TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT) {
+          if (this->use_exr) {
+            bool ret = Save16bitImageAsEXR(filename, image);
+            assert(ret);
+          } else {
+            // Use lodepng to save 16bit PNG.
+            // NOTE(syoyo): `loadpng::encode` requires image data must be stored in big endian.
+            std::vector<uint8_t> tmp = image.image; // copy
+            ToBigEndian(&tmp);
+
+            unsigned ret = lodepng::encode(
+                filename, tmp.data(), image.width, image.height,
+                GetLodePNGColorType(image.component), /* bits */ 16);
+            assert(ret == 0);  // 0 = no err.
+          }
+        } else {
+          // TODO(syoyo): check status
+          stbi_write_png(filename.c_str(), image.width, image.height,
+                         image.component, bytes_to_write, 0);
+        }
        break;
      case texture_output_format::bmp:
-        std::cout << "Image will be written to " << name << '\n';
-        name = path + "/" + name + ".bmp";
-        stbi_write_bmp(name.c_str(), image.width, image.height, image.component,
-                       image.image.data());
+        filename = path + "/" + basename + ".bmp";
+        std::cout << "Image will be written to " << filename << '\n';
+        stbi_write_bmp(filename.c_str(), image.width, image.height,
+                       image.component, bytes_to_write);
        break;
      case texture_output_format::tga:
-        std::cout << "Image will be written to " << name << '\n';
-        name = path + "/" + name + ".tga";
-        stbi_write_tga(name.c_str(), image.width, image.height, image.component,
-                       image.image.data());
+        filename = path + "/" + basename + ".tga";
+        std::cout << "Image will be written to " << filename << '\n';
+        stbi_write_tga(filename.c_str(), image.width, image.height,
+                       image.component, bytes_to_write);
        break;
    }
  }
--- a/examples/gltfutil/texture_dumper.h
+++ b/examples/gltfutil/texture_dumper.h
@@ -12,11 +12,15 @@ class texture_dumper {
 private:
  const tinygltf::Model& model;
  texture_output_format configured_format;
+  bool use_exr = false; // Use EXR for 16bit image?

 public:
  texture_dumper(const tinygltf::Model& inputModel);
  void dump_to_folder(const std::string& path = "./");
  void set_output_format(texture_output_format format);
+  void set_use_exr(const bool value) {
+    use_exr = value;
+  }

  static texture_output_format get_fromat_from_string(const std::string& str);
 };
--- a/examples/glview/.gitignore
+++ b/examples/glview/.gitignore
@@ -0,0 +1,7 @@
+.vs
+Debug
+x64
+packages
+
+!*.sln
+!*.vcxproj*
--- a/examples/glview/CMakeLists.txt
+++ b/examples/glview/CMakeLists.txt
@@ -0,0 +1,69 @@
+cmake_minimum_required(VERSION 3.5)
+project(glview)
+
+set ( CMAKE_PREFIX_PATH cmake )
+
+set ( DRACO_DIR "" CACHE STRING "Path to draco" )
+
+find_package ( GLEW REQUIRED )
+find_package ( GLFW3 REQUIRED )
+find_package ( OpenGL REQUIRED )
+
+if (APPLE)
+  find_library(COCOA_LIBRARY Cocoa)
+  find_library(COREVIDEO_LIBRARY CoreVideo)
+  find_library(IOKIT_LIBRARY IOKit)
+else ()
+  if (NOT WIN32)
+	# This means it is Unices
+	set ( GLFW3_UNIX_LINK_LIBRARIES X11 Xxf86vm Xrandr Xi Xinerama Xcursor )
+	find_package (Threads)
+  endif()
+endif (APPLE)
+
+set(CMAKE_CXX_STANDARD 11)
+
+if (DEFINED DRACO_DIR)
+  if (DRACO_DIR STREQUAL "")
+  else ()
+    # TODO(syoyo): better CMake script for draco
+    add_definitions(-DTINYGLTF_ENABLE_DRACO)
+    include_directories(${DRACO_DIR}/include)
+  
+    link_directories(${DRACO_DIR}/lib)
+    set(DRACO_LIBRARY draco)
+  endif ()
+endif()
+
+include_directories(
+  ../../
+  ../common
+  # ${OPENGL_INCLUDE_DIR}
+  ${GLEW_INCLUDE_DIR}
+  ${GLFW3_INCLUDE_DIR}
+  )
+
+add_executable(glview
+  glview.cc
+  ../common/trackball.cc
+  )
+
+target_link_libraries ( glview
+  ${DRACO_LIBRARY} 
+  ${GLFW3_UNIX_LINK_LIBRARIES}
+  ${GLEW_LIBRARY}
+  ${GLFW3_glfw_LIBRARY}
+  ${OPENGL_gl_LIBRARY}
+  ${OPENGL_glu_LIBRARY}
+  ${COCOA_LIBRARY}
+  ${COREVIDEO_LIBRARY}
+  ${IOKIT_LIBRARY}
+  ${CMAKE_DL_LIBS}
+  ${CMAKE_THREAD_LIBS_INIT}
+  )
+
+install ( TARGETS
+  glview
+  DESTINATION
+  bin
+  )
--- a/examples/glview/README.md
+++ b/examples/glview/README.md
@@ -27,6 +27,17 @@ Open .sln in Visual Studio 2013

 When running .exe, glew and glfw dll must exist in the working directory.

+#### Build with Draco(optional)
+
+Assume CMake build.
+
+```
+$ mkdir build
+$ cd build
+$ cmake -DDRACO_DIR=/path/to/draco ../
+$ make
+```
+
 ## TODO

 * [ ] PBR Material
--- a/examples/glview/cmake/GLFW3Config.cmake
+++ b/examples/glview/cmake/GLFW3Config.cmake
@@ -0,0 +1,71 @@
+#-*-cmake-*-
+#
+# yue.nicholas@gmail.com
+#
+# This auxiliary CMake file helps in find the glfw3 headers and libraries
+#
+# GLFW3_FOUND            set if glfw3 is found.
+# GLFW3_INCLUDE_DIR      glfw3's include directory
+# GLFW3_LIBRARY_DIR      glfw3's library directory
+# GLFW3_LIBRARIES        all glfw3 libraries
+
+FIND_PACKAGE (Threads)
+
+FIND_PACKAGE ( PackageHandleStandardArgs )
+
+FIND_PATH( GLFW3_LOCATION include/GLFW/glfw3.h
+  "$ENV{GLFW3_HOME}"
+)
+
+FIND_PACKAGE_HANDLE_STANDARD_ARGS ( GLFW3
+  REQUIRED_VARS GLFW3_LOCATION
+  )
+
+IF (GLFW3_FOUND)
+  SET( GLFW3_INCLUDE_DIR "${GLFW3_LOCATION}/include" CACHE STRING "GLFW3 include path")
+  IF (GLFW3_USE_STATIC_LIBS)
+    FIND_LIBRARY ( GLFW3_glfw_LIBRARY  libglfw3.a  ${GLFW3_LOCATION}/lib
+	  )
+  ELSE (GLFW3_USE_STATIC_LIBS)
+	# On windows build, we need to look for glfw3
+	IF (WIN32)
+	  SET ( GLFW3_LIBRARY_NAME glfw3 )
+	ELSE ()
+	  SET ( GLFW3_LIBRARY_NAME glfw )
+	ENDIF()
+    FIND_LIBRARY ( GLFW3_glfw_LIBRARY ${GLFW3_LIBRARY_NAME} ${GLFW3_LOCATION}/lib
+	  )
+  ENDIF (GLFW3_USE_STATIC_LIBS)
+
+  IF (APPLE)
+	FIND_LIBRARY ( COCOA_LIBRARY Cocoa )
+	FIND_LIBRARY ( IOKIT_LIBRARY IOKit )
+	FIND_LIBRARY ( COREVIDEO_LIBRARY CoreVideo )
+  ELSEIF (UNIX AND NOT APPLE)
+	SET ( GLFW3_REQUIRED_X11_LIBRARIES
+	  X11
+      Xi
+      Xrandr
+      Xinerama
+      Xcursor
+      Xxf86vm
+	  m
+	  ${CMAKE_DL_LIBS}
+	  ${CMAKE_THREAD_LIBS_INIT}
+      )
+  ENDIF ()
+  
+  SET ( GLFW3_LIBRARIES
+	${OPENGL_gl_LIBRARY}
+	${OPENGL_glu_LIBRARY}
+	${GLFW3_glfw_LIBRARY}
+	# UNIX
+	${GLFW3_REQUIRED_X11_LIBRARIES}
+	# APPLE
+	${COCOA_LIBRARY}
+	${IOKIT_LIBRARY}
+	${COREVIDEO_LIBRARY}
+	CACHE STRING "GLFW3 required libraries"
+	)
+  
+ENDIF ()
--- a/examples/glview/glview.cc
+++ b/examples/glview/glview.cc
@@ -12,11 +12,21 @@
 #define GLFW_INCLUDE_GLU
 #include <GLFW/glfw3.h>

+#ifdef _WIN32
+#include "../common/trackball.h"
+#else
 #include "trackball.h"
+#endif

 #define TINYGLTF_IMPLEMENTATION
 #define STB_IMAGE_IMPLEMENTATION
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+
+#ifdef _WIN32
+#include "../../tiny_gltf.h"
+#else
 #include "tiny_gltf.h"
+#endif

 #define BUFFER_OFFSET(i) ((char *)NULL + (i))

@@ -44,7 +54,9 @@ float eye[3], lookat[3], up[3];

 GLFWwindow *window;

-typedef struct { GLuint vb; } GLBufferState;
+typedef struct {
+  GLuint vb;
+} GLBufferState;

 typedef struct {
  std::vector<GLuint> diffuseTex;  // for each primitive in mesh
@@ -243,6 +255,26 @@ void motionFunc(GLFWwindow *window, double mouse_x, double mouse_y) {
  prevMouseY = mouse_y;
 }

+static size_t ComponentTypeByteSize(int type) {
+  switch (type) {
+    case TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE:
+    case TINYGLTF_COMPONENT_TYPE_BYTE:
+      return sizeof(char);
+    case TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT:
+    case TINYGLTF_COMPONENT_TYPE_SHORT:
+      return sizeof(short);
+    case TINYGLTF_COMPONENT_TYPE_UNSIGNED_INT:
+    case TINYGLTF_COMPONENT_TYPE_INT:
+      return sizeof(int);
+    case TINYGLTF_COMPONENT_TYPE_FLOAT:
+      return sizeof(float);
+    case TINYGLTF_COMPONENT_TYPE_DOUBLE:
+      return sizeof(double);
+    default:
+      return 0;
+  }
+}
+
 static void SetupMeshState(tinygltf::Model &model, GLuint progId) {
  // Buffer
  {
@@ -253,14 +285,117 @@ static void SetupMeshState(tinygltf::Model &model, GLuint progId) {
        continue;  // Unsupported bufferView.
      }

+      int sparse_accessor = -1;
+      for (size_t a_i = 0; a_i < model.accessors.size(); ++a_i) {
+        const auto &accessor = model.accessors[a_i];
+        if (accessor.bufferView == i) {
+          std::cout << i << " is used by accessor " << a_i << std::endl;
+          if (accessor.sparse.isSparse) {
+            std::cout
+                << "WARN: this bufferView has at least one sparse accessor to "
+                   "it. We are going to load the data as patched by this "
+                   "sparse accessor, not the original data"
+                << std::endl;
+            sparse_accessor = a_i;
+            break;
+          }
+        }
+      }
+
      const tinygltf::Buffer &buffer = model.buffers[bufferView.buffer];
      GLBufferState state;
      glGenBuffers(1, &state.vb);
      glBindBuffer(bufferView.target, state.vb);
      std::cout << "buffer.size= " << buffer.data.size()
                << ", byteOffset = " << bufferView.byteOffset << std::endl;
-      glBufferData(bufferView.target, bufferView.byteLength,
-                   &buffer.data.at(0) + bufferView.byteOffset, GL_STATIC_DRAW);
+
+      if (sparse_accessor < 0)
+        glBufferData(bufferView.target, bufferView.byteLength,
+                     &buffer.data.at(0) + bufferView.byteOffset,
+                     GL_STATIC_DRAW);
+      else {
+        const auto accessor = model.accessors[sparse_accessor];
+        // copy the buffer to a temporary one for sparse patching
+        unsigned char *tmp_buffer = new unsigned char[bufferView.byteLength];
+        memcpy(tmp_buffer, buffer.data.data() + bufferView.byteOffset,
+               bufferView.byteLength);
+
+        const size_t size_of_object_in_buffer =
+            ComponentTypeByteSize(accessor.componentType);
+        const size_t size_of_sparse_indices =
+            ComponentTypeByteSize(accessor.sparse.indices.componentType);
+
+        const auto &indices_buffer_view =
+            model.bufferViews[accessor.sparse.indices.bufferView];
+        const auto &indices_buffer = model.buffers[indices_buffer_view.buffer];
+
+        const auto &values_buffer_view =
+            model.bufferViews[accessor.sparse.values.bufferView];
+        const auto &values_buffer = model.buffers[values_buffer_view.buffer];
+
+        for (size_t sparse_index = 0; sparse_index < accessor.sparse.count;
+             ++sparse_index) {
+          int index = 0;
+          // std::cout << "accessor.sparse.indices.componentType = " <<
+          // accessor.sparse.indices.componentType << std::endl;
+          switch (accessor.sparse.indices.componentType) {
+            case TINYGLTF_COMPONENT_TYPE_BYTE:
+            case TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE:
+              index = (int)*(
+                  unsigned char *)(indices_buffer.data.data() +
+                                   indices_buffer_view.byteOffset +
+                                   accessor.sparse.indices.byteOffset +
+                                   (sparse_index * size_of_sparse_indices));
+              break;
+            case TINYGLTF_COMPONENT_TYPE_SHORT:
+            case TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT:
+              index = (int)*(
+                  unsigned short *)(indices_buffer.data.data() +
+                                    indices_buffer_view.byteOffset +
+                                    accessor.sparse.indices.byteOffset +
+                                    (sparse_index * size_of_sparse_indices));
+              break;
+            case TINYGLTF_COMPONENT_TYPE_INT:
+            case TINYGLTF_COMPONENT_TYPE_UNSIGNED_INT:
+              index = (int)*(
+                  unsigned int *)(indices_buffer.data.data() +
+                                  indices_buffer_view.byteOffset +
+                                  accessor.sparse.indices.byteOffset +
+                                  (sparse_index * size_of_sparse_indices));
+              break;
+          }
+          std::cout << "updating sparse data at index  : " << index
+                    << std::endl;
+          // index is now the target of the sparse index to patch in
+          const unsigned char *read_from =
+              values_buffer.data.data() +
+              (values_buffer_view.byteOffset +
+               accessor.sparse.values.byteOffset) +
+              (sparse_index * (size_of_object_in_buffer * accessor.type));
+
+          /*
+          std::cout << ((float*)read_from)[0] << "\n";
+          std::cout << ((float*)read_from)[1] << "\n";
+          std::cout << ((float*)read_from)[2] << "\n";
+          */
+
+          unsigned char *write_to =
+              tmp_buffer + index * (size_of_object_in_buffer * accessor.type);
+
+          memcpy(write_to, read_from, size_of_object_in_buffer * accessor.type);
+        }
+
+        // debug:
+        /*for(size_t p = 0; p < bufferView.byteLength/sizeof(float); p++)
+        {
+          float* b = (float*)tmp_buffer;
+          std::cout << "modified_buffer [" << p << "] = " << b[p] << '\n';
+        }*/
+
+        glBufferData(bufferView.target, bufferView.byteLength, tmp_buffer,
+                     GL_STATIC_DRAW);
+        delete[] tmp_buffer;
+      }
      glBindBuffer(bufferView.target, 0);

      gBufferState[i] = state;
@@ -268,55 +403,55 @@ static void SetupMeshState(tinygltf::Model &model, GLuint progId) {
  }

 #if 0  // TODO(syoyo): Implement
-  // Texture
-  {
-    for (size_t i = 0; i < model.meshes.size(); i++) {
-      const tinygltf::Mesh &mesh = model.meshes[i];
+	// Texture
+	{
+		for (size_t i = 0; i < model.meshes.size(); i++) {
+			const tinygltf::Mesh &mesh = model.meshes[i];

-      gMeshState[mesh.name].diffuseTex.resize(mesh.primitives.size());
-      for (size_t primId = 0; primId < mesh.primitives.size(); primId++) {
-        const tinygltf::Primitive &primitive = mesh.primitives[primId];
+			gMeshState[mesh.name].diffuseTex.resize(mesh.primitives.size());
+			for (size_t primId = 0; primId < mesh.primitives.size(); primId++) {
+				const tinygltf::Primitive &primitive = mesh.primitives[primId];

-        gMeshState[mesh.name].diffuseTex[primId] = 0;
+				gMeshState[mesh.name].diffuseTex[primId] = 0;

-        if (primitive.material < 0) {
-          continue;
-        }
-        tinygltf::Material &mat = model.materials[primitive.material];
-        // printf("material.name = %s\n", mat.name.c_str());
-        if (mat.values.find("diffuse") != mat.values.end()) {
-          std::string diffuseTexName = mat.values["diffuse"].string_value;
-          if (model.textures.find(diffuseTexName) != model.textures.end()) {
-            tinygltf::Texture &tex = model.textures[diffuseTexName];
-            if (scene.images.find(tex.source) != model.images.end()) {
-              tinygltf::Image &image = model.images[tex.source];
-              GLuint texId;
-              glGenTextures(1, &texId);
-              glBindTexture(tex.target, texId);
-              glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-              glTexParameterf(tex.target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-              glTexParameterf(tex.target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+				if (primitive.material < 0) {
+					continue;
+				}
+				tinygltf::Material &mat = model.materials[primitive.material];
+				// printf("material.name = %s\n", mat.name.c_str());
+				if (mat.values.find("diffuse") != mat.values.end()) {
+					std::string diffuseTexName = mat.values["diffuse"].string_value;
+					if (model.textures.find(diffuseTexName) != model.textures.end()) {
+						tinygltf::Texture &tex = model.textures[diffuseTexName];
+						if (scene.images.find(tex.source) != model.images.end()) {
+							tinygltf::Image &image = model.images[tex.source];
+							GLuint texId;
+							glGenTextures(1, &texId);
+							glBindTexture(tex.target, texId);
+							glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+							glTexParameterf(tex.target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+							glTexParameterf(tex.target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

-              // Ignore Texture.fomat.
-              GLenum format = GL_RGBA;
-              if (image.component == 3) {
-                format = GL_RGB;
-              }
-              glTexImage2D(tex.target, 0, tex.internalFormat, image.width,
-                           image.height, 0, format, tex.type,
-                           &image.image.at(0));
+							// Ignore Texture.fomat.
+							GLenum format = GL_RGBA;
+							if (image.component == 3) {
+								format = GL_RGB;
+							}
+							glTexImage2D(tex.target, 0, tex.internalFormat, image.width,
+									image.height, 0, format, tex.type,
+									&image.image.at(0));

-              CheckErrors("texImage2D");
-              glBindTexture(tex.target, 0);
+							CheckErrors("texImage2D");
+							glBindTexture(tex.target, 0);

-              printf("TexId = %d\n", texId);
-              gMeshState[mesh.name].diffuseTex[primId] = texId;
-            }
-          }
-        }
-      }
-    }
-  }
+							printf("TexId = %d\n", texId);
+							gMeshState[mesh.name].diffuseTex[primId] = texId;
+						}
+					}
+				}
+			}
+		}
+	}
 #endif

  glUseProgram(progId);
@@ -337,164 +472,164 @@ static void SetupMeshState(tinygltf::Model &model, GLuint progId) {
 #if 0  // TODO(syoyo): Implement
 // Setup curves geometry extension
 static void SetupCurvesState(tinygltf::Scene &scene, GLuint progId) {
-  // Find curves primitive.
-  {
-    std::map<std::string, tinygltf::Mesh>::const_iterator it(
-        scene.meshes.begin());
-    std::map<std::string, tinygltf::Mesh>::const_iterator itEnd(
-        scene.meshes.end());
+	// Find curves primitive.
+	{
+		std::map<std::string, tinygltf::Mesh>::const_iterator it(
+				scene.meshes.begin());
+		std::map<std::string, tinygltf::Mesh>::const_iterator itEnd(
+				scene.meshes.end());

-    for (; it != itEnd; it++) {
-      const tinygltf::Mesh &mesh = it->second;
+		for (; it != itEnd; it++) {
+			const tinygltf::Mesh &mesh = it->second;

-      // Currently we only support one primitive per mesh.
-      if (mesh.primitives.size() > 1) {
-        continue;
-      }
+			// Currently we only support one primitive per mesh.
+			if (mesh.primitives.size() > 1) {
+				continue;
+			}

-      for (size_t primId = 0; primId < mesh.primitives.size(); primId++) {
-        const tinygltf::Primitive &primitive = mesh.primitives[primId];
+			for (size_t primId = 0; primId < mesh.primitives.size(); primId++) {
+				const tinygltf::Primitive &primitive = mesh.primitives[primId];

-        gMeshState[mesh.name].diffuseTex[primId] = 0;
+				gMeshState[mesh.name].diffuseTex[primId] = 0;

-        if (primitive.material.empty()) {
-          continue;
-        }
+				if (primitive.material.empty()) {
+					continue;
+				}

-        bool has_curves = false;
-        if (primitive.extras.IsObject()) {
-          if (primitive.extras.Has("ext_mode")) {
-            const tinygltf::Value::Object &o =
-                primitive.extras.Get<tinygltf::Value::Object>();
-            const tinygltf::Value &ext_mode = o.find("ext_mode")->second;
+				bool has_curves = false;
+				if (primitive.extras.IsObject()) {
+					if (primitive.extras.Has("ext_mode")) {
+						const tinygltf::Value::Object &o =
+							primitive.extras.Get<tinygltf::Value::Object>();
+						const tinygltf::Value &ext_mode = o.find("ext_mode")->second;

-            if (ext_mode.IsString()) {
-              const std::string &str = ext_mode.Get<std::string>();
-              if (str.compare("curves") == 0) {
-                has_curves = true;
-              }
-            }
-          }
-        }
+						if (ext_mode.IsString()) {
+							const std::string &str = ext_mode.Get<std::string>();
+							if (str.compare("curves") == 0) {
+								has_curves = true;
+							}
+						}
+					}
+				}

-        if (!has_curves) {
-          continue;
-        }
+				if (!has_curves) {
+					continue;
+				}

-        // Construct curves buffer
-        const tinygltf::Accessor &vtx_accessor =
-            scene.accessors[primitive.attributes.find("POSITION")->second];
-        const tinygltf::Accessor &nverts_accessor =
-            scene.accessors[primitive.attributes.find("NVERTS")->second];
-        const tinygltf::BufferView &vtx_bufferView =
-            scene.bufferViews[vtx_accessor.bufferView];
-        const tinygltf::BufferView &nverts_bufferView =
-            scene.bufferViews[nverts_accessor.bufferView];
-        const tinygltf::Buffer &vtx_buffer =
-            scene.buffers[vtx_bufferView.buffer];
-        const tinygltf::Buffer &nverts_buffer =
-            scene.buffers[nverts_bufferView.buffer];
+				// Construct curves buffer
+				const tinygltf::Accessor &vtx_accessor =
+					scene.accessors[primitive.attributes.find("POSITION")->second];
+				const tinygltf::Accessor &nverts_accessor =
+					scene.accessors[primitive.attributes.find("NVERTS")->second];
+				const tinygltf::BufferView &vtx_bufferView =
+					scene.bufferViews[vtx_accessor.bufferView];
+				const tinygltf::BufferView &nverts_bufferView =
+					scene.bufferViews[nverts_accessor.bufferView];
+				const tinygltf::Buffer &vtx_buffer =
+					scene.buffers[vtx_bufferView.buffer];
+				const tinygltf::Buffer &nverts_buffer =
+					scene.buffers[nverts_bufferView.buffer];

-        // std::cout << "vtx_bufferView = " << vtx_accessor.bufferView <<
-        // std::endl;
-        // std::cout << "nverts_bufferView = " << nverts_accessor.bufferView <<
-        // std::endl;
-        // std::cout << "vtx_buffer.size = " << vtx_buffer.data.size() <<
-        // std::endl;
-        // std::cout << "nverts_buffer.size = " << nverts_buffer.data.size() <<
-        // std::endl;
+				// std::cout << "vtx_bufferView = " << vtx_accessor.bufferView <<
+				// std::endl;
+				// std::cout << "nverts_bufferView = " << nverts_accessor.bufferView <<
+				// std::endl;
+				// std::cout << "vtx_buffer.size = " << vtx_buffer.data.size() <<
+				// std::endl;
+				// std::cout << "nverts_buffer.size = " << nverts_buffer.data.size() <<
+				// std::endl;

-        const int *nverts =
-            reinterpret_cast<const int *>(nverts_buffer.data.data());
-        const float *vtx =
-            reinterpret_cast<const float *>(vtx_buffer.data.data());
+				const int *nverts =
+					reinterpret_cast<const int *>(nverts_buffer.data.data());
+				const float *vtx =
+					reinterpret_cast<const float *>(vtx_buffer.data.data());

-        // Convert to GL_LINES data.
-        std::vector<float> line_pts;
-        size_t vtx_offset = 0;
-        for (int k = 0; k < static_cast<int>(nverts_accessor.count); k++) {
-          for (int n = 0; n < nverts[k] - 1; n++) {
+				// Convert to GL_LINES data.
+				std::vector<float> line_pts;
+				size_t vtx_offset = 0;
+				for (int k = 0; k < static_cast<int>(nverts_accessor.count); k++) {
+					for (int n = 0; n < nverts[k] - 1; n++) {

-            line_pts.push_back(vtx[3 * (vtx_offset + n) + 0]);
-            line_pts.push_back(vtx[3 * (vtx_offset + n) + 1]);
-            line_pts.push_back(vtx[3 * (vtx_offset + n) + 2]);
+						line_pts.push_back(vtx[3 * (vtx_offset + n) + 0]);
+						line_pts.push_back(vtx[3 * (vtx_offset + n) + 1]);
+						line_pts.push_back(vtx[3 * (vtx_offset + n) + 2]);

-            line_pts.push_back(vtx[3 * (vtx_offset + n + 1) + 0]);
-            line_pts.push_back(vtx[3 * (vtx_offset + n + 1) + 1]);
-            line_pts.push_back(vtx[3 * (vtx_offset + n + 1) + 2]);
+						line_pts.push_back(vtx[3 * (vtx_offset + n + 1) + 0]);
+						line_pts.push_back(vtx[3 * (vtx_offset + n + 1) + 1]);
+						line_pts.push_back(vtx[3 * (vtx_offset + n + 1) + 2]);

-            // std::cout << "p0 " << vtx[3 * (vtx_offset + n) + 0] << ", "
-            //                  << vtx[3 * (vtx_offset + n) + 1] << ", "
-            //                  << vtx[3 * (vtx_offset + n) + 2] << std::endl;
+						// std::cout << "p0 " << vtx[3 * (vtx_offset + n) + 0] << ", "
+						//                  << vtx[3 * (vtx_offset + n) + 1] << ", "
+						//                  << vtx[3 * (vtx_offset + n) + 2] << std::endl;

-            // std::cout << "p1 " << vtx[3 * (vtx_offset + n+1) + 0] << ", "
-            //                  << vtx[3 * (vtx_offset + n+1) + 1] << ", "
-            //                  << vtx[3 * (vtx_offset + n+1) + 2] << std::endl;
-          }
+						// std::cout << "p1 " << vtx[3 * (vtx_offset + n+1) + 0] << ", "
+						//                  << vtx[3 * (vtx_offset + n+1) + 1] << ", "
+						//                  << vtx[3 * (vtx_offset + n+1) + 2] << std::endl;
+					}

-          vtx_offset += nverts[k];
-        }
+					vtx_offset += nverts[k];
+				}

-        GLCurvesState state;
-        glGenBuffers(1, &state.vb);
-        glBindBuffer(GL_ARRAY_BUFFER, state.vb);
-        glBufferData(GL_ARRAY_BUFFER, line_pts.size() * sizeof(float),
-                     line_pts.data(), GL_STATIC_DRAW);
-        glBindBuffer(GL_ARRAY_BUFFER, 0);
+				GLCurvesState state;
+				glGenBuffers(1, &state.vb);
+				glBindBuffer(GL_ARRAY_BUFFER, state.vb);
+				glBufferData(GL_ARRAY_BUFFER, line_pts.size() * sizeof(float),
+						line_pts.data(), GL_STATIC_DRAW);
+				glBindBuffer(GL_ARRAY_BUFFER, 0);

-        state.count = line_pts.size() / 3;
-        gCurvesMesh[mesh.name] = state;
+				state.count = line_pts.size() / 3;
+				gCurvesMesh[mesh.name] = state;

-        // Material
-        tinygltf::Material &mat = scene.materials[primitive.material];
-        // printf("material.name = %s\n", mat.name.c_str());
-        if (mat.values.find("diffuse") != mat.values.end()) {
-          std::string diffuseTexName = mat.values["diffuse"].string_value;
-          if (scene.textures.find(diffuseTexName) != scene.textures.end()) {
-            tinygltf::Texture &tex = scene.textures[diffuseTexName];
-            if (scene.images.find(tex.source) != scene.images.end()) {
-              tinygltf::Image &image = scene.images[tex.source];
-              GLuint texId;
-              glGenTextures(1, &texId);
-              glBindTexture(tex.target, texId);
-              glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-              glTexParameterf(tex.target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-              glTexParameterf(tex.target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+				// Material
+				tinygltf::Material &mat = scene.materials[primitive.material];
+				// printf("material.name = %s\n", mat.name.c_str());
+				if (mat.values.find("diffuse") != mat.values.end()) {
+					std::string diffuseTexName = mat.values["diffuse"].string_value;
+					if (scene.textures.find(diffuseTexName) != scene.textures.end()) {
+						tinygltf::Texture &tex = scene.textures[diffuseTexName];
+						if (scene.images.find(tex.source) != scene.images.end()) {
+							tinygltf::Image &image = scene.images[tex.source];
+							GLuint texId;
+							glGenTextures(1, &texId);
+							glBindTexture(tex.target, texId);
+							glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+							glTexParameterf(tex.target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+							glTexParameterf(tex.target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

-              // Ignore Texture.fomat.
-              GLenum format = GL_RGBA;
-              if (image.component == 3) {
-                format = GL_RGB;
-              }
-              glTexImage2D(tex.target, 0, tex.internalFormat, image.width,
-                           image.height, 0, format, tex.type,
-                           &image.image.at(0));
+							// Ignore Texture.fomat.
+							GLenum format = GL_RGBA;
+							if (image.component == 3) {
+								format = GL_RGB;
+							}
+							glTexImage2D(tex.target, 0, tex.internalFormat, image.width,
+									image.height, 0, format, tex.type,
+									&image.image.at(0));

-              CheckErrors("texImage2D");
-              glBindTexture(tex.target, 0);
+							CheckErrors("texImage2D");
+							glBindTexture(tex.target, 0);

-              printf("TexId = %d\n", texId);
-              gMeshState[mesh.name].diffuseTex[primId] = texId;
-            }
-          }
-        }
-      }
-    }
-  }
+							printf("TexId = %d\n", texId);
+							gMeshState[mesh.name].diffuseTex[primId] = texId;
+						}
+					}
+				}
+			}
+		}
+	}

-  glUseProgram(progId);
-  GLint vtloc = glGetAttribLocation(progId, "in_vertex");
-  GLint nrmloc = glGetAttribLocation(progId, "in_normal");
-  GLint uvloc = glGetAttribLocation(progId, "in_texcoord");
+	glUseProgram(progId);
+	GLint vtloc = glGetAttribLocation(progId, "in_vertex");
+	GLint nrmloc = glGetAttribLocation(progId, "in_normal");
+	GLint uvloc = glGetAttribLocation(progId, "in_texcoord");

-  GLint diffuseTexLoc = glGetUniformLocation(progId, "diffuseTex");
-  GLint isCurvesLoc = glGetUniformLocation(progId, "uIsCurves");
+	GLint diffuseTexLoc = glGetUniformLocation(progId, "diffuseTex");
+	GLint isCurvesLoc = glGetUniformLocation(progId, "uIsCurves");

-  gGLProgramState.attribs["POSITION"] = vtloc;
-  gGLProgramState.attribs["NORMAL"] = nrmloc;
-  gGLProgramState.attribs["TEXCOORD_0"] = uvloc;
-  gGLProgramState.uniforms["diffuseTex"] = diffuseTexLoc;
-  gGLProgramState.uniforms["uIsCurves"] = isCurvesLoc;
+	gGLProgramState.attribs["POSITION"] = vtloc;
+	gGLProgramState.attribs["NORMAL"] = nrmloc;
+	gGLProgramState.attribs["TEXCOORD_0"] = uvloc;
+	gGLProgramState.uniforms["diffuseTex"] = diffuseTexLoc;
+	gGLProgramState.uniforms["uIsCurves"] = isCurvesLoc;
 };
 #endif

@@ -547,12 +682,13 @@ static void DrawMesh(tinygltf::Model &model, const tinygltf::Mesh &mesh) {
          (it->first.compare("TEXCOORD_0") == 0)) {
        if (gGLProgramState.attribs[it->first] >= 0) {
          // Compute byteStride from Accessor + BufferView combination.
-          int byteStride = accessor.ByteStride(model.bufferViews[accessor.bufferView]);
+          int byteStride =
+              accessor.ByteStride(model.bufferViews[accessor.bufferView]);
          assert(byteStride != -1);
          glVertexAttribPointer(gGLProgramState.attribs[it->first], size,
-                                accessor.componentType, accessor.normalized ? GL_TRUE : GL_FALSE,
-                                byteStride,
-                                BUFFER_OFFSET(accessor.byteOffset));
+                                accessor.componentType,
+                                accessor.normalized ? GL_TRUE : GL_FALSE,
+                                byteStride, BUFFER_OFFSET(accessor.byteOffset));
          CheckErrors("vertex attrib pointer");
          glEnableVertexAttribArray(gGLProgramState.attribs[it->first]);
          CheckErrors("enable vertex attrib array");
@@ -606,32 +742,32 @@ static void DrawMesh(tinygltf::Model &model, const tinygltf::Mesh &mesh) {

 #if 0  // TODO(syoyo): Implement
 static void DrawCurves(tinygltf::Scene &scene, const tinygltf::Mesh &mesh) {
-  (void)scene;
+	(void)scene;

-  if (gCurvesMesh.find(mesh.name) == gCurvesMesh.end()) {
-    return;
-  }
+	if (gCurvesMesh.find(mesh.name) == gCurvesMesh.end()) {
+		return;
+	}

-  if (gGLProgramState.uniforms["isCurvesLoc"] >= 0) {
-    glUniform1i(gGLProgramState.uniforms["isCurvesLoc"], 1);
-  }
+	if (gGLProgramState.uniforms["isCurvesLoc"] >= 0) {
+		glUniform1i(gGLProgramState.uniforms["isCurvesLoc"], 1);
+	}

-  GLCurvesState &state = gCurvesMesh[mesh.name];
+	GLCurvesState &state = gCurvesMesh[mesh.name];

-  if (gGLProgramState.attribs["POSITION"] >= 0) {
-    glBindBuffer(GL_ARRAY_BUFFER, state.vb);
-    glVertexAttribPointer(gGLProgramState.attribs["POSITION"], 3, GL_FLOAT,
-                          GL_FALSE, /* stride */ 0, BUFFER_OFFSET(0));
-    CheckErrors("curve: vertex attrib pointer");
-    glEnableVertexAttribArray(gGLProgramState.attribs["POSITION"]);
-    CheckErrors("curve: enable vertex attrib array");
-  }
+	if (gGLProgramState.attribs["POSITION"] >= 0) {
+		glBindBuffer(GL_ARRAY_BUFFER, state.vb);
+		glVertexAttribPointer(gGLProgramState.attribs["POSITION"], 3, GL_FLOAT,
+				GL_FALSE, /* stride */ 0, BUFFER_OFFSET(0));
+		CheckErrors("curve: vertex attrib pointer");
+		glEnableVertexAttribArray(gGLProgramState.attribs["POSITION"]);
+		CheckErrors("curve: enable vertex attrib array");
+	}

-  glDrawArrays(GL_LINES, 0, state.count);
+	glDrawArrays(GL_LINES, 0, state.count);

-  if (gGLProgramState.attribs["POSITION"] >= 0) {
-    glDisableVertexAttribArray(gGLProgramState.attribs["POSITION"]);
-  }
+	if (gGLProgramState.attribs["POSITION"] >= 0) {
+		glDisableVertexAttribArray(gGLProgramState.attribs["POSITION"]);
+	}
 }
 #endif

@@ -666,10 +802,14 @@ static void DrawNode(tinygltf::Model &model, const tinygltf::Node &node) {
  // std::cout << it->first << std::endl;
  // FIXME(syoyo): Refactor.
  // DrawCurves(scene, it->second);
-  DrawMesh(model, model.meshes[node.mesh]);
+  if (node.mesh > -1) {
+    assert(node.mesh < model.meshes.size());
+    DrawMesh(model, model.meshes[node.mesh]);
+  }

  // Draw child nodes.
  for (size_t i = 0; i < node.children.size(); i++) {
+    assert(node.children[i] < model.nodes.size());
    DrawNode(model, model.nodes[node.children[i]]);
  }

@@ -678,18 +818,19 @@ static void DrawNode(tinygltf::Model &model, const tinygltf::Node &node) {

 static void DrawModel(tinygltf::Model &model) {
 #if 0
-  std::map<std::string, tinygltf::Mesh>::const_iterator it(scene.meshes.begin());
-  std::map<std::string, tinygltf::Mesh>::const_iterator itEnd(scene.meshes.end());
+	std::map<std::string, tinygltf::Mesh>::const_iterator it(scene.meshes.begin());
+	std::map<std::string, tinygltf::Mesh>::const_iterator itEnd(scene.meshes.end());

-  for (; it != itEnd; it++) {
-    DrawMesh(scene, it->second);
-    DrawCurves(scene, it->second);
-  }
+	for (; it != itEnd; it++) {
+		DrawMesh(scene, it->second);
+		DrawCurves(scene, it->second);
+	}
 #else
-
-  // TODO(syoyo): Support non-default scenes.
-  assert(model.defaultScene >= 0);
-  const tinygltf::Scene &scene = model.scenes[model.defaultScene];
+  // If the glTF asset has at least one scene, and doesn't define a default one
+  // just show the first one we can find
+  assert(model.scenes.size() > 0);
+  int scene_to_display = model.defaultScene > -1 ? model.defaultScene : 0;
+  const tinygltf::Scene &scene = model.scenes[scene_to_display];
  for (size_t i = 0; i < scene.nodes.size(); i++) {
    DrawNode(model, model.nodes[scene.nodes[i]]);
  }
@@ -720,8 +861,8 @@ static void PrintNodes(const tinygltf::Scene &scene) {

 int main(int argc, char **argv) {
  if (argc < 2) {
-    std::cout << "glview input.gltf <scale>\n" << std::endl;
-    return 0;
+    std::cout << "glview input.gltf <scale>" << std::endl;
+    std::cout << "defaulting to example cube model" << std::endl;
  }

  float scale = 1.0f;
@@ -732,16 +873,31 @@ int main(int argc, char **argv) {
  tinygltf::Model model;
  tinygltf::TinyGLTF loader;
  std::string err;
-  std::string input_filename(argv[1]);
+  std::string warn;
+
+#ifdef _WIN32
+#ifdef _DEBUG
+  std::string input_filename(argv[1] ? argv[1]
+                                     : "../../../models/Cube/Cube.gltf");
+#endif
+#else
+  std::string input_filename(argv[1] ? argv[1] : "../../models/Cube/Cube.gltf");
+#endif
+
  std::string ext = GetFilePathExtension(input_filename);

  bool ret = false;
  if (ext.compare("glb") == 0) {
    // assume binary glTF.
-    ret = loader.LoadBinaryFromFile(&model, &err, input_filename.c_str());
+    ret =
+        loader.LoadBinaryFromFile(&model, &err, &warn, input_filename.c_str());
  } else {
    // assume ascii glTF.
-    ret = loader.LoadASCIIFromFile(&model, &err, input_filename.c_str());
+    ret = loader.LoadASCIIFromFile(&model, &err, &warn, input_filename.c_str());
+  }
+
+  if (!warn.empty()) {
+    printf("Warn: %s\n", warn.c_str());
  }

  if (!err.empty()) {
@@ -755,17 +911,19 @@ int main(int argc, char **argv) {
  Init();

  // DBG
-  PrintNodes(model.scenes[model.defaultScene]);
+  PrintNodes(model.scenes[model.defaultScene > -1 ? model.defaultScene : 0]);

  if (!glfwInit()) {
    std::cerr << "Failed to initialize GLFW." << std::endl;
    return -1;
  }

-  char title[1024];
-  sprintf(title, "Simple glTF viewer: %s", input_filename.c_str());
+  std::stringstream ss;
+  ss << "Simple glTF viewer: " << input_filename;

-  window = glfwCreateWindow(width, height, title, NULL, NULL);
+  std::string title = ss.str();
+
+  window = glfwCreateWindow(width, height, title.c_str(), NULL, NULL);
  if (window == NULL) {
    std::cerr << "Failed to open GLFW window. " << std::endl;
    glfwTerminate();
@@ -791,12 +949,23 @@ int main(int argc, char **argv) {
  reshapeFunc(window, width, height);

  GLuint vertId = 0, fragId = 0, progId = 0;
-  if (false == LoadShader(GL_VERTEX_SHADER, vertId, "shader.vert")) {
+
+#ifdef _WIN32
+#ifdef _DEBUG
+  const char *shader_frag_filename = "../shader.frag";
+  const char *shader_vert_filename = "../shader.vert";
+#endif
+#else
+  const char *shader_frag_filename = "shader.frag";
+  const char *shader_vert_filename = "shader.vert";
+#endif
+
+  if (false == LoadShader(GL_VERTEX_SHADER, vertId, shader_vert_filename)) {
    return -1;
  }
  CheckErrors("load vert shader");

-  if (false == LoadShader(GL_FRAGMENT_SHADER, fragId, "shader.frag")) {
+  if (false == LoadShader(GL_FRAGMENT_SHADER, fragId, shader_frag_filename)) {
    return -1;
  }
  CheckErrors("load frag shader");
--- a/examples/glview/glview.sln
+++ b/examples/glview/glview.sln
@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28010.2050
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "glview", "glview\glview.vcxproj", "{D078BB24-377E-497B-8045-03AF2A0547ED}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{D078BB24-377E-497B-8045-03AF2A0547ED}.Debug|x64.ActiveCfg = Debug|x64
+		{D078BB24-377E-497B-8045-03AF2A0547ED}.Debug|x64.Build.0 = Debug|x64
+		{D078BB24-377E-497B-8045-03AF2A0547ED}.Debug|x86.ActiveCfg = Debug|Win32
+		{D078BB24-377E-497B-8045-03AF2A0547ED}.Debug|x86.Build.0 = Debug|Win32
+		{D078BB24-377E-497B-8045-03AF2A0547ED}.Release|x64.ActiveCfg = Release|x64
+		{D078BB24-377E-497B-8045-03AF2A0547ED}.Release|x64.Build.0 = Release|x64
+		{D078BB24-377E-497B-8045-03AF2A0547ED}.Release|x86.ActiveCfg = Release|Win32
+		{D078BB24-377E-497B-8045-03AF2A0547ED}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {DB7C2F91-06C9-4BD8-95BF-04814E0C62DA}
+	EndGlobalSection
+EndGlobal
--- a/examples/glview/glview/glview.vcxproj
+++ b/examples/glview/glview/glview.vcxproj
@@ -0,0 +1,152 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>15.0</VCProjectVersion>
+    <ProjectGuid>{D078BB24-377E-497B-8045-03AF2A0547ED}</ProjectGuid>
+    <RootNamespace>glview</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0.17134.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup />
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies);opengl32.lib;glu32.lib</AdditionalDependencies>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies);opengl32.lib;glu32.lib</AdditionalDependencies>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalDependencies>kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies);opengl32.lib;glu32.lib</AdditionalDependencies>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalDependencies>kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies);opengl32.lib;glu32.lib</AdditionalDependencies>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\common\trackball.cc" />
+    <ClCompile Include="..\glview.cc" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+    <Import Project="..\packages\nupengl.core.redist.0.1.0.1\build\native\nupengl.core.redist.targets" Condition="Exists('..\packages\nupengl.core.redist.0.1.0.1\build\native\nupengl.core.redist.targets')" />
+    <Import Project="..\packages\nupengl.core.0.1.0.1\build\native\nupengl.core.targets" Condition="Exists('..\packages\nupengl.core.0.1.0.1\build\native\nupengl.core.targets')" />
+  </ImportGroup>
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\packages\nupengl.core.redist.0.1.0.1\build\native\nupengl.core.redist.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\nupengl.core.redist.0.1.0.1\build\native\nupengl.core.redist.targets'))" />
+    <Error Condition="!Exists('..\packages\nupengl.core.0.1.0.1\build\native\nupengl.core.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\nupengl.core.0.1.0.1\build\native\nupengl.core.targets'))" />
+  </Target>
+</Project>
--- a/examples/glview/glview/glview.vcxproj.filters
+++ b/examples/glview/glview/glview.vcxproj.filters
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;ipp;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\glview.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\common\trackball.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+</Project>
--- a/examples/glview/glview/glview.vcxproj.user
+++ b/examples/glview/glview/glview.vcxproj.user
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup />
+</Project>
--- a/examples/glview/glview/packages.config
+++ b/examples/glview/glview/packages.config
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="nupengl.core" version="0.1.0.1" targetFramework="native" />
+  <package id="nupengl.core.redist" version="0.1.0.1" targetFramework="native" />
+</packages>
--- a/examples/glview/premake5.lua
+++ b/examples/glview/premake5.lua
@@ -8,9 +8,10 @@ solution "glview"
      kind "ConsoleApp"
      language "C++"
 	  cppdialect "C++11"
-      files { "glview.cc", "trackball.cc" }
+      files { "glview.cc", "../common/trackball.cc" }
      includedirs { "./" }
      includedirs { "../../" }
+      includedirs { "../common/" }

      configuration { "linux" }
         linkoptions { "`pkg-config --libs glfw3`" }
--- a/examples/glview/trackball.cc
+++ b/examples/glview/trackball.cc
@@ -1,292 +0,0 @@
-/*
- * (c) Copyright 1993, 1994, Silicon Graphics, Inc.
- * ALL RIGHTS RESERVED
- * Permission to use, copy, modify, and distribute this software for
- * any purpose and without fee is hereby granted, provided that the above
- * copyright notice appear in all copies and that both the copyright notice
- * and this permission notice appear in supporting documentation, and that
- * the name of Silicon Graphics, Inc. not be used in advertising
- * or publicity pertaining to distribution of the software without specific,
- * written prior permission.
- *
- * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
- * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
- * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
- * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
- * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
- * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
- * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
- * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
- * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
- * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * US Government Users Restricted Rights
- * Use, duplication, or disclosure by the Government is subject to
- * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
- * (c)(1)(ii) of the Rights in Technical Data and Computer Software
- * clause at DFARS 252.227-7013 and/or in similar or successor
- * clauses in the FAR or the DOD or NASA FAR Supplement.
- * Unpublished-- rights reserved under the copyright laws of the
- * United States.  Contractor/manufacturer is Silicon Graphics,
- * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
- *
- * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
- */
-/*
- * Trackball code:
- *
- * Implementation of a virtual trackball.
- * Implemented by Gavin Bell, lots of ideas from Thant Tessman and
- *   the August '88 issue of Siggraph's "Computer Graphics," pp. 121-129.
- *
- * Vector manip code:
- *
- * Original code from:
- * David M. Ciemiewicz, Mark Grossman, Henry Moreton, and Paul Haeberli
- *
- * Much mucking with by:
- * Gavin Bell
- */
-#include <math.h>
-#include "trackball.h"
-
-/*
- * This size should really be based on the distance from the center of
- * rotation to the point on the object underneath the mouse.  That
- * point would then track the mouse as closely as possible.  This is a
- * simple example, though, so that is left as an Exercise for the
- * Programmer.
- */
-#define TRACKBALLSIZE (0.8)
-
-/*
- * Local function prototypes (not defined in trackball.h)
- */
-static float tb_project_to_sphere(float, float, float);
-static void normalize_quat(float[4]);
-
-static void vzero(float *v) {
-  v[0] = 0.0;
-  v[1] = 0.0;
-  v[2] = 0.0;
-}
-
-static void vset(float *v, float x, float y, float z) {
-  v[0] = x;
-  v[1] = y;
-  v[2] = z;
-}
-
-static void vsub(const float *src1, const float *src2, float *dst) {
-  dst[0] = src1[0] - src2[0];
-  dst[1] = src1[1] - src2[1];
-  dst[2] = src1[2] - src2[2];
-}
-
-static void vcopy(const float *v1, float *v2) {
-  register int i;
-  for (i = 0; i < 3; i++)
-    v2[i] = v1[i];
-}
-
-static void vcross(const float *v1, const float *v2, float *cross) {
-  float temp[3];
-
-  temp[0] = (v1[1] * v2[2]) - (v1[2] * v2[1]);
-  temp[1] = (v1[2] * v2[0]) - (v1[0] * v2[2]);
-  temp[2] = (v1[0] * v2[1]) - (v1[1] * v2[0]);
-  vcopy(temp, cross);
-}
-
-static float vlength(const float *v) {
-  return sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);
-}
-
-static void vscale(float *v, float div) {
-  v[0] *= div;
-  v[1] *= div;
-  v[2] *= div;
-}
-
-static void vnormal(float *v) { vscale(v, 1.0 / vlength(v)); }
-
-static float vdot(const float *v1, const float *v2) {
-  return v1[0] * v2[0] + v1[1] * v2[1] + v1[2] * v2[2];
-}
-
-static void vadd(const float *src1, const float *src2, float *dst) {
-  dst[0] = src1[0] + src2[0];
-  dst[1] = src1[1] + src2[1];
-  dst[2] = src1[2] + src2[2];
-}
-
-/*
- * Ok, simulate a track-ball.  Project the points onto the virtual
- * trackball, then figure out the axis of rotation, which is the cross
- * product of P1 P2 and O P1 (O is the center of the ball, 0,0,0)
- * Note:  This is a deformed trackball-- is a trackball in the center,
- * but is deformed into a hyperbolic sheet of rotation away from the
- * center.  This particular function was chosen after trying out
- * several variations.
- *
- * It is assumed that the arguments to this routine are in the range
- * (-1.0 ... 1.0)
- */
-void trackball(float q[4], float p1x, float p1y, float p2x, float p2y) {
-  float a[3]; /* Axis of rotation */
-  float phi;  /* how much to rotate about axis */
-  float p1[3], p2[3], d[3];
-  float t;
-
-  if (p1x == p2x && p1y == p2y) {
-    /* Zero rotation */
-    vzero(q);
-    q[3] = 1.0;
-    return;
-  }
-
-  /*
-   * First, figure out z-coordinates for projection of P1 and P2 to
-   * deformed sphere
-   */
-  vset(p1, p1x, p1y, tb_project_to_sphere(TRACKBALLSIZE, p1x, p1y));
-  vset(p2, p2x, p2y, tb_project_to_sphere(TRACKBALLSIZE, p2x, p2y));
-
-  /*
-   *  Now, we want the cross product of P1 and P2
-   */
-  vcross(p2, p1, a);
-
-  /*
-   *  Figure out how much to rotate around that axis.
-   */
-  vsub(p1, p2, d);
-  t = vlength(d) / (2.0 * TRACKBALLSIZE);
-
-  /*
-   * Avoid problems with out-of-control values...
-   */
-  if (t > 1.0)
-    t = 1.0;
-  if (t < -1.0)
-    t = -1.0;
-  phi = 2.0 * asin(t);
-
-  axis_to_quat(a, phi, q);
-}
-
-/*
- *  Given an axis and angle, compute quaternion.
- */
-void axis_to_quat(float a[3], float phi, float q[4]) {
-  vnormal(a);
-  vcopy(a, q);
-  vscale(q, sin(phi / 2.0));
-  q[3] = cos(phi / 2.0);
-}
-
-/*
- * Project an x,y pair onto a sphere of radius r OR a hyperbolic sheet
- * if we are away from the center of the sphere.
- */
-static float tb_project_to_sphere(float r, float x, float y) {
-  float d, t, z;
-
-  d = sqrt(x * x + y * y);
-  if (d < r * 0.70710678118654752440) { /* Inside sphere */
-    z = sqrt(r * r - d * d);
-  } else { /* On hyperbola */
-    t = r / 1.41421356237309504880;
-    z = t * t / d;
-  }
-  return z;
-}
-
-/*
- * Given two rotations, e1 and e2, expressed as quaternion rotations,
- * figure out the equivalent single rotation and stuff it into dest.
- *
- * This routine also normalizes the result every RENORMCOUNT times it is
- * called, to keep error from creeping in.
- *
- * NOTE: This routine is written so that q1 or q2 may be the same
- * as dest (or each other).
- */
-
-#define RENORMCOUNT 97
-
-void add_quats(float q1[4], float q2[4], float dest[4]) {
-  static int count = 0;
-  float t1[4], t2[4], t3[4];
-  float tf[4];
-
-  vcopy(q1, t1);
-  vscale(t1, q2[3]);
-
-  vcopy(q2, t2);
-  vscale(t2, q1[3]);
-
-  vcross(q2, q1, t3);
-  vadd(t1, t2, tf);
-  vadd(t3, tf, tf);
-  tf[3] = q1[3] * q2[3] - vdot(q1, q2);
-
-  dest[0] = tf[0];
-  dest[1] = tf[1];
-  dest[2] = tf[2];
-  dest[3] = tf[3];
-
-  if (++count > RENORMCOUNT) {
-    count = 0;
-    normalize_quat(dest);
-  }
-}
-
-/*
- * Quaternions always obey:  a^2 + b^2 + c^2 + d^2 = 1.0
- * If they don't add up to 1.0, dividing by their magnitued will
- * renormalize them.
- *
- * Note: See the following for more information on quaternions:
- *
- * - Shoemake, K., Animating rotation with quaternion curves, Computer
- *   Graphics 19, No 3 (Proc. SIGGRAPH'85), 245-254, 1985.
- * - Pletinckx, D., Quaternion calculus as a basic tool in computer
- *   graphics, The Visual Computer 5, 2-13, 1989.
- */
-static void normalize_quat(float q[4]) {
-  int i;
-  float mag;
-
-  mag = (q[0] * q[0] + q[1] * q[1] + q[2] * q[2] + q[3] * q[3]);
-  for (i = 0; i < 4; i++)
-    q[i] /= mag;
-}
-
-/*
- * Build a rotation matrix, given a quaternion rotation.
- *
- */
-void build_rotmatrix(float m[4][4], const float q[4]) {
-  m[0][0] = 1.0 - 2.0 * (q[1] * q[1] + q[2] * q[2]);
-  m[0][1] = 2.0 * (q[0] * q[1] - q[2] * q[3]);
-  m[0][2] = 2.0 * (q[2] * q[0] + q[1] * q[3]);
-  m[0][3] = 0.0;
-
-  m[1][0] = 2.0 * (q[0] * q[1] + q[2] * q[3]);
-  m[1][1] = 1.0 - 2.0 * (q[2] * q[2] + q[0] * q[0]);
-  m[1][2] = 2.0 * (q[1] * q[2] - q[0] * q[3]);
-  m[1][3] = 0.0;
-
-  m[2][0] = 2.0 * (q[2] * q[0] - q[1] * q[3]);
-  m[2][1] = 2.0 * (q[1] * q[2] + q[0] * q[3]);
-  m[2][2] = 1.0 - 2.0 * (q[1] * q[1] + q[0] * q[0]);
-  m[2][3] = 0.0;
-
-  m[3][0] = 0.0;
-  m[3][1] = 0.0;
-  m[3][2] = 0.0;
-  m[3][3] = 1.0;
-}
--- a/examples/glview/trackball.h
+++ b/examples/glview/trackball.h
@@ -1,75 +0,0 @@
-/*
- * (c) Copyright 1993, 1994, Silicon Graphics, Inc.
- * ALL RIGHTS RESERVED
- * Permission to use, copy, modify, and distribute this software for
- * any purpose and without fee is hereby granted, provided that the above
- * copyright notice appear in all copies and that both the copyright notice
- * and this permission notice appear in supporting documentation, and that
- * the name of Silicon Graphics, Inc. not be used in advertising
- * or publicity pertaining to distribution of the software without specific,
- * written prior permission.
- *
- * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
- * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
- * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
- * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
- * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
- * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
- * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
- * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
- * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
- * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * US Government Users Restricted Rights
- * Use, duplication, or disclosure by the Government is subject to
- * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
- * (c)(1)(ii) of the Rights in Technical Data and Computer Software
- * clause at DFARS 252.227-7013 and/or in similar or successor
- * clauses in the FAR or the DOD or NASA FAR Supplement.
- * Unpublished-- rights reserved under the copyright laws of the
- * United States.  Contractor/manufacturer is Silicon Graphics,
- * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
- *
- * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
- */
-/*
- * trackball.h
- * A virtual trackball implementation
- * Written by Gavin Bell for Silicon Graphics, November 1988.
- */
-
-/*
- * Pass the x and y coordinates of the last and current positions of
- * the mouse, scaled so they are from (-1.0 ... 1.0).
- *
- * The resulting rotation is returned as a quaternion rotation in the
- * first paramater.
- */
-void trackball(float q[4], float p1x, float p1y, float p2x, float p2y);
-
-void negate_quat(float *q, float *qn);
-
-/*
- * Given two quaternions, add them together to get a third quaternion.
- * Adding quaternions to get a compound rotation is analagous to adding
- * translations to get a compound translation.  When incrementally
- * adding rotations, the first argument here should be the new
- * rotation, the second and third the total rotation (which will be
- * over-written with the resulting new total rotation).
- */
-void add_quats(float *q1, float *q2, float *dest);
-
-/*
- * A useful function, builds a rotation matrix in Matrix based on
- * given quaternion.
- */
-void build_rotmatrix(float m[4][4], const float q[4]);
-
-/*
- * This function computes a quaternion based on an axis (defined by
- * the given vector) and an angle about which to rotate.  The angle is
- * expressed in radians.  The result is put into the third argument.
- */
-void axis_to_quat(float a[3], float phi, float q[4]);
--- a/examples/raytrace/gltf-loader.cc
+++ b/examples/raytrace/gltf-loader.cc
@@ -26,15 +26,20 @@ bool LoadGLTF(const std::string &filename, float scale,
  tinygltf::Model model;
  tinygltf::TinyGLTF loader;
  std::string err;
+  std::string warn;
  const std::string ext = GetFilePathExtension(filename);

  bool ret = false;
  if (ext.compare("glb") == 0) {
    // assume binary glTF.
-    ret = loader.LoadBinaryFromFile(&model, &err, filename.c_str());
+    ret = loader.LoadBinaryFromFile(&model, &err, &warn, filename.c_str());
  } else {
    // assume ascii glTF.
-    ret = loader.LoadASCIIFromFile(&model, &err, filename.c_str());
+    ret = loader.LoadASCIIFromFile(&model, &err, &warn, filename.c_str());
+  }
+
+  if (!warn.empty()) {
+    std::cout << "glTF parse warning: " << warn << std::endl;
  }

  if (!err.empty()) {
@@ -293,7 +298,7 @@ bool LoadGLTF(const std::string &filename, float scale,

                        loadedMesh.facevarying_normals.push_back(n1.x);
                        loadedMesh.facevarying_normals.push_back(n1.y);
-                        loadedMesh.facevarying_normals.push_back(n2.z);
+                        loadedMesh.facevarying_normals.push_back(n1.z);

                        loadedMesh.facevarying_normals.push_back(n2.x);
                        loadedMesh.facevarying_normals.push_back(n2.y);
@@ -328,7 +333,7 @@ bool LoadGLTF(const std::string &filename, float scale,

                        loadedMesh.facevarying_normals.push_back(n1.x);
                        loadedMesh.facevarying_normals.push_back(n1.y);
-                        loadedMesh.facevarying_normals.push_back(n2.z);
+                        loadedMesh.facevarying_normals.push_back(n1.z);

                        loadedMesh.facevarying_normals.push_back(n2.x);
                        loadedMesh.facevarying_normals.push_back(n2.y);
--- a/examples/saver/main.cc
+++ b/examples/saver/main.cc
@@ -25,13 +25,17 @@ int main(int argc, char *argv[]) {
  tinygltf::Model model;
  tinygltf::TinyGLTF loader;
  std::string err;
+  std::string warn;
  std::string input_filename(argv[1]);
  std::string output_filename(argv[2]);
  std::string embedded_filename =
      output_filename.substr(0, output_filename.size() - 5) + "-Embedded.gltf";

  // assume ascii glTF.
-  bool ret = loader.LoadASCIIFromFile(&model, &err, input_filename.c_str());
+  bool ret = loader.LoadASCIIFromFile(&model, &err, &warn, input_filename.c_str());
+  if (!warn.empty()) {
+    std::cout << "warn : " << warn << std::endl;
+  }
  if (!ret) {
    if (!err.empty()) {
      std::cerr << err << std::endl;
--- a/examples/validator/CMakeLists.txt
+++ b/examples/validator/CMakeLists.txt
@@ -45,3 +45,9 @@ endif()

 # test-zone
 # enable_testing()
+
+install ( TARGETS
+  tinygltf-validator
+  DESTINATION
+  bin
+  )
--- a/experimental/README.md
+++ b/experimental/README.md
@@ -0,0 +1,15 @@
+# Python script which generates C++11 code from JSON schema.
+
+## Requirements
+
+* python3
+* jsonref
+
+## Generate
+
+Run `gen.py` by specifing the path to glTF schema directory(from https://github.com/KhronosGroup/glTF.git)
+
+```
+$ python gen.py /path/to/glTF/specification/2.0/schema
+```
+
--- a/experimental/gen.py
+++ b/experimental/gen.py
@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import sys, os
+import subprocess
+import json
+from pprint import pprint
+import jsonref
+
+# glTF 2.0
+schema_files = [
+    "glTF.schema.json"
+]
+
+def main():
+    if len(sys.argv) < 2:
+        print("Requires path to glTF scheme directory.")
+        sys.exit(-1)
+    
+    gltf_schema_dir = sys.argv[1]
+
+    gltf_schema_filepath = os.path.join(gltf_schema_dir, schema_files[0])
+    if not os.path.exists(gltf_schema_filepath):
+        print("File not found: {}".format(gltf_schema_filepath))
+        sys.exit(-1)
+
+    gltf_schema_uri = 'file://{}/'.format(gltf_schema_dir)
+    with open(gltf_schema_filepath) as schema_file:
+        j = jsonref.loads(schema_file.read(), base_uri=gltf_schema_uri, jsonschema=True)
+        pprint(j)
+
+    
+
+main()
--- a/json.hpp
+++ b/json.hpp
--- a/loader_example.cc
+++ b/loader_example.cc
@@ -1,3 +1,6 @@
+//
+// TODO(syoyo): Print extensions and extras for each glTF object.
+//
 #define TINYGLTF_IMPLEMENTATION
 #define STB_IMAGE_IMPLEMENTATION
 #define STB_IMAGE_WRITE_IMPLEMENTATION
@@ -225,7 +228,8 @@ static std::string PrintParameterMap(const tinygltf::ParameterMap &pmap) {
 #endif

 static std::string PrintValue(const std::string &name,
-                              const tinygltf::Value &value, const int indent) {
+                              const tinygltf::Value &value, const int indent,
+                              const bool tag = true) {
  std::stringstream ss;

  if (value.IsObject()) {
@@ -233,19 +237,44 @@ static std::string PrintValue(const std::string &name,
    tinygltf::Value::Object::const_iterator it(o.begin());
    tinygltf::Value::Object::const_iterator itEnd(o.end());
    for (; it != itEnd; it++) {
-      ss << PrintValue(name, it->second, indent + 1);
+      ss << PrintValue(it->first, it->second, indent + 1) << std::endl;
    }
  } else if (value.IsString()) {
-    ss << Indent(indent) << name << " : " << value.Get<std::string>()
-       << std::endl;
+    if (tag) {
+      ss << Indent(indent) << name << " : " << value.Get<std::string>();
+    } else {
+      ss << " " << value.Get<std::string>() << " ";
+    }
  } else if (value.IsBool()) {
-    ss << Indent(indent) << name << " : " << value.Get<bool>() << std::endl;
+    if (tag) {
+      ss << Indent(indent) << name << " : " << value.Get<bool>();
+    } else {
+      ss << " " << value.Get<bool>() << " ";
+    }
  } else if (value.IsNumber()) {
-    ss << Indent(indent) << name << " : " << value.Get<double>() << std::endl;
+    if (tag) {
+      ss << Indent(indent) << name << " : " << value.Get<double>();
+    } else {
+      ss << " " << value.Get<double>() << " ";
+    }
  } else if (value.IsInt()) {
-    ss << Indent(indent) << name << " : " << value.Get<int>() << std::endl;
+    if (tag) {
+      ss << Indent(indent) << name << " : " << value.Get<int>();
+    } else {
+      ss << " " << value.Get<int>() << " ";
+    }
+  } else if (value.IsArray()) {
+    ss << Indent(indent) << name << " [ ";
+    for (size_t i = 0; i < value.Size(); i++) {
+      ss << PrintValue("", value.Get(int(i)), indent + 1, /* tag */ false);
+      if (i != (value.ArrayLen() - 1)) {
+        ss << ", ";
+      }
+    }
+    ss << Indent(indent) << "] ";
  }
-  // @todo { binary, array }
+
+  // @todo { binary }

  return ss.str();
 }
@@ -301,13 +330,13 @@ static void DumpPrimitive(const tinygltf::Primitive &primitive, int indent) {
            << PrintValue("extras", primitive.extras, indent + 1) << std::endl;
 }

-static void DumpExtensions(const tinygltf::ExtensionMap &extension, const int indent)
-{
-  // TODO(syoyo): Print extensions
+static void DumpExtensions(const tinygltf::ExtensionMap &extension,
+                           const int indent) {
+  // TODO(syoyo): pritty print Value
  for (auto &e : extension) {
    std::cout << Indent(indent) << e.first << std::endl;
-    //std::cout << Indent(indent+1) << PrintParameterMap(e.second);
-  }  
+    std::cout << PrintValue("extensions", e.second, indent + 1) << std::endl;
+  }
 }

 static void Dump(const tinygltf::Model &model) {
@@ -368,7 +397,7 @@ static void Dump(const tinygltf::Model &model) {
        std::cout << Indent(2) << "min          : [";
        for (size_t k = 0; k < accessor.minValues.size(); k++) {
          std::cout << accessor.minValues[k]
-                    << ((i != accessor.minValues.size() - 1) ? ", " : "");
+                    << ((k != accessor.minValues.size() - 1) ? ", " : "");
        }
        std::cout << "]" << std::endl;
      }
@@ -376,10 +405,34 @@ static void Dump(const tinygltf::Model &model) {
        std::cout << Indent(2) << "max          : [";
        for (size_t k = 0; k < accessor.maxValues.size(); k++) {
          std::cout << accessor.maxValues[k]
-                    << ((i != accessor.maxValues.size() - 1) ? ", " : "");
+                    << ((k != accessor.maxValues.size() - 1) ? ", " : "");
        }
        std::cout << "]" << std::endl;
      }
+
+      if (accessor.sparse.isSparse) {
+        std::cout << Indent(2) << "sparse:" << std::endl;
+        std::cout << Indent(3) << "count  : " << accessor.sparse.count
+                  << std::endl;
+        std::cout << Indent(3) << "indices: " << std::endl;
+        std::cout << Indent(4)
+                  << "bufferView   : " << accessor.sparse.indices.bufferView
+                  << std::endl;
+        std::cout << Indent(4)
+                  << "byteOffset   : " << accessor.sparse.indices.byteOffset
+                  << std::endl;
+        std::cout << Indent(4) << "componentType: "
+                  << PrintComponentType(accessor.sparse.indices.componentType)
+                  << "(" << accessor.sparse.indices.componentType << ")"
+                  << std::endl;
+        std::cout << Indent(3) << "values : " << std::endl;
+        std::cout << Indent(4)
+                  << "bufferView   : " << accessor.sparse.values.bufferView
+                  << std::endl;
+        std::cout << Indent(4)
+                  << "byteOffset   : " << accessor.sparse.values.byteOffset
+                  << std::endl;
+      }
    }
  }

@@ -488,6 +541,7 @@ static void Dump(const tinygltf::Model &model) {
      std::cout << Indent(2) << "width     : " << image.width << std::endl;
      std::cout << Indent(2) << "height    : " << image.height << std::endl;
      std::cout << Indent(2) << "component : " << image.component << std::endl;
+      DumpExtensions(image.extensions, 1);
    }
  }

@@ -499,6 +553,7 @@ static void Dump(const tinygltf::Model &model) {
                << std::endl;
      std::cout << Indent(1) << "source         : " << texture.source
                << std::endl;
+      DumpExtensions(texture.extensions, 1);
    }
  }

@@ -554,10 +609,11 @@ static void Dump(const tinygltf::Model &model) {
      }
    }
  }
-  
+
  // toplevel extensions
  {
-    std::cout << "extensions(items=" << model.extensions.size() << ")" << std::endl;
+    std::cout << "extensions(items=" << model.extensions.size() << ")"
+              << std::endl;
    DumpExtensions(model.extensions, 1);
  }
 }
@@ -571,6 +627,7 @@ int main(int argc, char **argv) {
  tinygltf::Model model;
  tinygltf::TinyGLTF gltf_ctx;
  std::string err;
+  std::string warn;
  std::string input_filename(argv[1]);
  std::string ext = GetFilePathExtension(input_filename);

@@ -578,11 +635,17 @@ int main(int argc, char **argv) {
  if (ext.compare("glb") == 0) {
    std::cout << "Reading binary glTF" << std::endl;
    // assume binary glTF.
-    ret = gltf_ctx.LoadBinaryFromFile(&model, &err, input_filename.c_str());
+    ret = gltf_ctx.LoadBinaryFromFile(&model, &err, &warn,
+                                      input_filename.c_str());
  } else {
    std::cout << "Reading ASCII glTF" << std::endl;
    // assume ascii glTF.
-    ret = gltf_ctx.LoadASCIIFromFile(&model, &err, input_filename.c_str());
+    ret =
+        gltf_ctx.LoadASCIIFromFile(&model, &err, &warn, input_filename.c_str());
+  }
+
+  if (!warn.empty()) {
+    printf("Warn: %s\n", warn.c_str());
  }

  if (!err.empty()) {
--- a/models/Extensions-issue97/test.gltf
+++ b/models/Extensions-issue97/test.gltf
@@ -0,0 +1,66 @@
+
+{
+  "scenes" : [
+    {
+      "nodes" : [ 0 ]
+    }
+  ],
+  
+  "nodes" : [
+    {
+      "mesh" : 0
+    }
+  ],
+
+  "meshes" : [
+    {
+      "primitives" : [ {
+        "attributes" : {
+          "POSITION" : 0
+        }
+      } ]
+    }
+  ],
+
+  "buffers" : [
+    {
+      "uri" : "data:application/octet-stream;base64,AAAAAAAAAAAAAAAAAACAPwAAAAAAAAAAAAAAAAAAgD8AAAAA",
+      "byteLength" : 36
+    }
+  ],
+  "bufferViews" : [
+    {
+      "buffer" : 0,
+      "byteOffset" : 0,
+      "byteLength" : 36,
+      "target" : 34962
+    }
+  ],
+  "accessors" : [
+    {
+      "bufferView" : 0,
+      "byteOffset" : 0,
+      "componentType" : 5126,
+      "count" : 3,
+      "type" : "VEC3",
+      "max" : [ 1.0, 1.0, 0.0 ],
+      "min" : [ 0.0, 0.0, 0.0 ]
+    }
+  ],
+  
+  "asset" : {
+    "version" : "2.0"
+  },
+
+  "materials" : [
+    { "name" : "WHITE",
+      "extensions": {
+        "VENDOR_material_some_ext" : { }
+      }
+    }
+  ],
+  
+  "extensionsUsed" : [
+    "VENDOR_material_some_ext"
+  ]
+}
--- a/models/box01.glb
+++ b/models/box01.glb
--- a/stb_image.h
+++ b/stb_image.h
--- a/stb_image_write.h
+++ b/stb_image_write.h
--- a/test_runner.py
+++ b/test_runner.py
@@ -14,6 +14,7 @@ import subprocess
 sample_model_dir = "/home/syoyo/work/glTF-Sample-Models"
 base_model_dir = os.path.join(sample_model_dir, "2.0")

+# Include `glTF-Draco` when you build `loader_example` with draco support.
 kinds = [ "glTF", "glTF-Binary", "glTF-Embedded", "glTF-MaterialsCommon"]
 # ---------------------------------

@@ -28,7 +29,7 @@ def run(filename):
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        (stdout, stderr) = p.communicate()
    except:
-        print "Failed to execute: ", cmd
+        print("Failed to execute: ", cmd)
        raise

    if p.returncode != 0:
--- a/tests/tester.cc
+++ b/tests/tester.cc
@@ -1,5 +1,6 @@
 #define TINYGLTF_IMPLEMENTATION
 #define STB_IMAGE_IMPLEMENTATION
+#define STB_IMAGE_WRITE_IMPLEMENTATION
 #include "tiny_gltf.h"

 #define CATCH_CONFIG_MAIN  // This tells Catch to provide a main() - only do this in one cpp file
@@ -17,10 +18,71 @@ TEST_CASE("parse-error", "[parse]") {
  tinygltf::Model model;
  tinygltf::TinyGLTF ctx;
  std::string err;
+  std::string warn;

-  bool ret = ctx.LoadASCIIFromString(&model, &err, "bora", strlen("bora"), /* basedir*/ "");
+  bool ret = ctx.LoadASCIIFromString(&model, &err, &warn, "bora", strlen("bora"), /* basedir*/ "");

  REQUIRE(false == ret);

 }

+TEST_CASE("datauri-in-glb", "[issue-79]") {
+
+  tinygltf::Model model;
+  tinygltf::TinyGLTF ctx;
+  std::string err;
+  std::string warn;
+
+  bool ret = ctx.LoadBinaryFromFile(&model, &err, &warn, "../models/box01.glb");
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+    
+  REQUIRE(true == ret);
+}
+
+TEST_CASE("extension-with-empty-object", "[issue-97]") {
+
+  tinygltf::Model model;
+  tinygltf::TinyGLTF ctx;
+  std::string err;
+  std::string warn;
+
+  bool ret = ctx.LoadASCIIFromFile(&model, &err, &warn, "../models/Extensions-issue97/test.gltf");
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(true == ret);
+
+  REQUIRE(model.extensionsUsed.size() == 1);
+  REQUIRE(model.extensionsUsed[0].compare("VENDOR_material_some_ext") == 0);
+
+  REQUIRE(model.materials.size() == 1);
+  REQUIRE(model.materials[0].extensions.size() == 1);
+  REQUIRE(model.materials[0].extensions.count("VENDOR_material_some_ext") == 1);
+
+  // TODO(syoyo): create temp directory.
+  {
+    ret = ctx.WriteGltfSceneToFile(&model, "issue-97.gltf", true, true);
+    REQUIRE(true == ret);
+
+    tinygltf::Model m;
+
+    // read back serialized glTF
+    bool ret = ctx.LoadASCIIFromFile(&m, &err, &warn, "issue-97.gltf");
+    if (!err.empty()) {
+      std::cerr << err << std::endl;
+    }
+    REQUIRE(true == ret);
+
+    REQUIRE(m.extensionsUsed.size() == 1);
+    REQUIRE(m.extensionsUsed[0].compare("VENDOR_material_some_ext") == 0);
+
+    REQUIRE(m.materials.size() == 1);
+    REQUIRE(m.materials[0].extensions.size() == 1);
+    REQUIRE(m.materials[0].extensions.count("VENDOR_material_some_ext") == 1);
+  }
+    
+}
+
+
--- a/tiny_gltf.h
+++ b/tiny_gltf.h