Keep up with tinyobj's API update.

Initial success to convert .obj to .glTF mesh.
Implement .obj to glTF like mesh data converter
2026-06-09 11:43:49 +00:00 · 2020-03-11 19:30:57 +09:00 · 2020-03-11 17:58:02 +09:00 · 2020-03-10 22:19:14 +09:00 · 2020-03-09 22:34:50 +09:00 · 2020-03-08 22:13:39 +09:00
32 changed files with 4277 additions and 3270 deletions
--- a/.github/ISSUE_TEMPLATE/config.yml
+++ b/.github/ISSUE_TEMPLATE/config.yml
@@ -1 +0,0 @@
-blank_issues_enabled: false
--- a/.github/ISSUE_TEMPLATE/issue-report.md
+++ b/.github/ISSUE_TEMPLATE/issue-report.md
@@ -1,30 +0,0 @@
---
-name: Issue report
-about: Create a report
-title: ''
-labels: ''
-assignees: ''
-
---
-
-**Describe the issue**
-
-A clear and concise description of what the issue is.
-
-**To Reproduce**
-
- OS
- Compiler, compiler version, compile options
- Please attach minimal and reproducible .glTF file if you got an issue related to .glTF data
-
-**Expected behaviour**
-
-A clear and concise description of what you expected to happen.
-
-**Screenshots**
-
-If applicable, add screenshots to help explain your problem.
-
-
-**Additional context**
-Add any other context about the problem here.
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -1,165 +0,0 @@
-name: C/C++ CI
-
-on: [push, pull_request]
-
-jobs:
-
-  # compile with older gcc4.8
-  build-gcc48:
-
-    runs-on: ubuntu-18.04
-    name: Build with gcc 4.8
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v1
-
-      - name: Build
-        run: |
-            sudo apt-get update
-            sudo apt-get install -y build-essential
-            sudo apt-get install -y gcc-4.8 g++-4.8
-            g++-4.8 -std=c++11 -o loader_example loader_example.cc
-
-      - name: NoexceptBuild
-        run: |
-            g++-4.8 -DTINYGLTF_NOEXCEPTION -std=c++11 -o loader_example loader_example.cc
-
-      - name: RapidjsonBuild
-        run: |
-            git clone https://github.com/Tencent/rapidjson
-            g++-4.8 -DTINYGLTF_USE_RAPIDJSON -I./rapidjson/include/rapidjson -std=c++11 -o loader_example loader_example.cc
-
-  # compile with mingw gcc cross
-  build-mingw-cross:
-
-    runs-on: ubuntu-18.04
-    name: Build with MinGW gcc cross
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v1
-
-      - name: Build
-        run: |
-            sudo apt-get update
-            sudo apt-get install -y build-essential
-            sudo apt-get install -y mingw-w64
-            x86_64-w64-mingw32-g++ -std=c++11 -o loader_example loader_example.cc
-
-  # Windows(x64) + Visual Studio 2019 build
-  build-windows-msvc:
-
-    runs-on: windows-latest
-    name: Build for Windows(x64, MSVC)
-
-    # Use system installed cmake
-    # https://help.github.com/en/actions/reference/software-installed-on-github-hosted-runners
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v1
-      - name: Configure
-        run: |
-          mkdir build
-          cd build
-          cmake -G "Visual Studio 16 2019" -DTINYGLTF_BUILD_LOADER_EXAMPLE=On -DTINYGLTF_BUILD_GL_EXAMPLES=Off -DTINYGLTF_BUILD_VALIDATOR_EXAMPLE=On ..
-          cd ..
-      - name: Build
-        run: cmake --build build --config Release
-
-
-  build-linux:
-
-    runs-on: ubuntu-latest
-    name: Buld with gcc
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: build
-      run: |
-        g++ -std=c++11 -o loader_example loader_example.cc
-    - name: test
-      run: |
-        ./loader_example models/Cube/Cube.gltf
-
-    - name: tests
-      run: |
-        cd tests
-        g++ -I../  -std=c++11 -g -O0 -o tester tester.cc
-        ./tester
-        cd ..
-
-    - name: noexcept_tests
-      run: |
-        cd tests
-        g++ -DTINYGLTF_NOEXCEPTION -I../  -std=c++11 -g -O0 -o tester_noexcept tester.cc
-        ./tester_noexcept
-        cd ..
-
-
-  build-rapidjson-linux:
-
-    runs-on: ubuntu-latest
-    name: Buld with gcc + rapidjson
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: build
-      run: |
-        git clone https://github.com/Tencent/rapidjson
-        g++ -v
-        g++ -DTINYGLTF_USE_RAPIDJSON -I./rapidjson/include/rapidjson -std=c++11 -o loader_example loader_example.cc
-
-    - name: loader_example_test
-      run: |
-        ./loader_example models/Cube/Cube.gltf
-
-    - name: tests
-      run: |
-        cd tests
-        g++ -DTINYGLTF_USE_RAPIDJSON -I../rapidjson/include/rapidjson -I../  -std=c++11 -g -O0 -o tester tester.cc
-        ./tester
-        cd ..
-
-    - name: noexcept_tests
-      run: |
-        cd tests
-        g++ -DTINYGLTF_USE_RAPIDJSON -I../rapidjson/include/rapidjson -DTINYGLTF_NOEXCEPTION -I../  -std=c++11 -g -O0 -o tester_noexcept tester.cc
-        ./tester_noexcept
-        cd ..
-
-  # Cross-compile for aarch64 linux target
-  build-cross-aarch64:
-
-    runs-on: ubuntu-18.04
-    name: Build on cross aarch64
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v1
-      - name: Build
-        run: |
-            sudo apt-get update
-            sudo apt-get install -y build-essential
-            sudo apt-get install -y gcc-8-aarch64-linux-gnu g++-8-aarch64-linux-gnu
-
-            git clone https://github.com/Tencent/rapidjson
-            aarch64-linux-gnu-g++-8 -DTINYGLTF_USE_RAPIDJSON -I./rapidjson/include/rapidjson -std=c++11 -g -O0 -o loader_example loader_example.cc
-
-  # macOS clang
-  build-macos:
-
-    runs-on: macos-latest
-    name: Build on macOS
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v1
-      - name: Build
-        run: |
-            clang++ -std=c++11 -g -O0 -o loader_example loader_example.cc
-            ./loader_example models/Cube/Cube.gltf
-
-            git clone https://github.com/Tencent/rapidjson
-            clang++ -DTINYGLTF_USE_RAPIDJSON -I./rapidjson/include/rapidjson -std=c++11 -g -O0 -o loader_example loader_example.cc
-
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,29 +4,17 @@ PROJECT (tinygltf)

 SET(CMAKE_CXX_STANDARD 11)

-option(TINYGLTF_BUILD_LOADER_EXAMPLE "Build loader_example" ON)
-option(TINYGLTF_BUILD_GL_EXAMPLES "Build GL exampels(requires glfw, OpenGL, etc)" OFF)
-option(TINYGLTF_BUILD_VALIDATOR_EXAMPLE "Build validator example" OFF)
-option(TINYGLTF_BUILD_BUILDER_EXAMPLE "Build glTF builder example" OFF)
+option(TINYGLTF_BUILD_EXAMPLES "Build examples" ON)

-if (TINYGLTF_BUILD_LOADER_EXAMPLE)
+if (TINYGLTF_BUILD_EXAMPLES)
  ADD_EXECUTABLE ( loader_example
    loader_example.cc
    )
-endif (TINYGLTF_BUILD_LOADER_EXAMPLE)

-if (TINYGLTF_BUILD_GL_EXAMPLES)
  ADD_SUBDIRECTORY ( examples/gltfutil )
  ADD_SUBDIRECTORY ( examples/glview )
-endif (TINYGLTF_BUILD_GL_EXAMPLES)
-
-if (TINYGLTF_BUILD_VALIDATOR_EXAMPLE)
  ADD_SUBDIRECTORY ( examples/validator )
-endif (TINYGLTF_BUILD_VALIDATOR_EXAMPLE)
-
-if (TINYGLTF_BUILD_BUILDER_EXAMPLE)
-  ADD_SUBDIRECTORY ( examples/build-gltf )
-endif (TINYGLTF_BUILD_BUILDER_EXAMPLE)
+endif (TINYGLTF_BUILD_EXAMPLES)

 #
 # TinuGLTF is a header-only library, so no library build. just install header files.
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 `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(but not maintained anymore).
+If you are looking for old, C++03 version, please use `devel-picojson` branch.

 ## Status

@@ -13,18 +13,12 @@ If you are looking for old, C++03 version, please use `devel-picojson` branch(bu
 - v2.1.0 release(Draco support)
 - v2.0.0 release(22 Aug, 2018)!

-### Branches
-
-* `sajson` : Use sajson to parse JSON. Parsing only but faster compile time(2x reduction compared to json.hpp and RapidJson)
-
 ## Builds

 [![Build Status](https://travis-ci.org/syoyo/tinygltf.svg?branch=devel)](https://travis-ci.org/syoyo/tinygltf)

 [![Build status](https://ci.appveyor.com/api/projects/status/warngenu9wjjhlm8?svg=true)](https://ci.appveyor.com/project/syoyo/tinygltf)

-![C/C++ CI](https://github.com/syoyo/tinygltf/workflows/C/C++%20CI/badge.svg)
-
 ## Features

 * Written in portable C++. C++-11 with STL dependency only.
@@ -77,7 +71,6 @@ In extension(`ExtensionMap`), JSON number value is parsed as int or float(number
 * [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.
-* [build-gltf](examples/build-gltf) : Build simple glTF scene from a scratch.

 ## Projects using TinyGLTF

@@ -90,8 +83,6 @@ In extension(`ExtensionMap`), JSON number value is parsed as int or float(number
 * [QuickLook GLTF](https://github.com/toshiks/glTF-quicklook) - quicklook plugin for macos. Also SceneKit wrapper for tinygltf.
 * [GlslViewer](https://github.com/patriciogonzalezvivo/glslViewer) - live GLSL coding for MacOS and Linux
 * [Vulkan-Samples](https://github.com/KhronosGroup/Vulkan-Samples) - The Vulkan Samples is collection of resources to help you develop optimized Vulkan applications.
-* [TDME2](https://github.com/andreasdr/tdme2) - TDME2 - ThreeDeeMiniEngine2 is a lightweight 3D engine including tools suited for 3D game development using C++11
-* [SanityEngine](https://github.com/DethRaid/SanityEngine) - A C++/D3D12 renderer focused on the personal and proessional development of its developer
 * Your projects here! (Please send PR)

 ## TODOs
@@ -157,10 +148,6 @@ if (!ret) {
 }
 ```

-#### Loader options
-
-* `TinyGLTF::SetPreserveimageChannels(bool onoff)`. `true` to preserve image channels as stored in image file for loaded image. `false` by default for backward compatibility(image channels are widen to `RGBA` 4 channels). Effective only when using builtin image loader(STB image loader).
-
 ## Compile options

 * `TINYGLTF_NOEXCEPTION` : Disable C++ exception in JSON parsing. You can use `-fno-exceptions` or by defining the symbol `JSON_NOEXCEPTION` and `TINYGLTF_NOEXCEPTION`  to fully remove C++ exception codes when compiling TinyGLTF.
--- a/examples/basic/.gitignore
+++ b/examples/basic/.gitignore
@@ -1,6 +1,5 @@
 .vs
 Debug
-Release
 x64
 packages

--- a/examples/basic/README.md
+++ b/examples/basic/README.md
@@ -19,7 +19,3 @@ $ make
 Plese use solution file located at `basic` folder.


-## Limitation
-
-There are so many limitations in this example(e.g. no PBR shader. the shader only shows texture of textures[0] if available).
-
--- a/examples/basic/basic/basic.vcxproj
+++ b/examples/basic/basic/basic.vcxproj
@@ -22,32 +22,32 @@
    <VCProjectVersion>15.0</VCProjectVersion>
    <ProjectGuid>{0589AC44-0CF3-40D8-8D89-68393CFD40F3}</ProjectGuid>
    <RootNamespace>basic</RootNamespace>
-    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+    <WindowsTargetPlatformVersion>10.0.17134.0</WindowsTargetPlatformVersion>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v142</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
    <CharacterSet>MultiByte</CharacterSet>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v142</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
    <WholeProgramOptimization>true</WholeProgramOptimization>
    <CharacterSet>MultiByte</CharacterSet>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v142</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
    <CharacterSet>MultiByte</CharacterSet>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v142</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
    <WholeProgramOptimization>true</WholeProgramOptimization>
    <CharacterSet>MultiByte</CharacterSet>
  </PropertyGroup>
--- a/examples/basic/main.cpp
+++ b/examples/basic/main.cpp
@@ -100,49 +100,42 @@ std::map<int, GLuint> bindMesh(std::map<int, GLuint> vbos,
        std::cout << "vaa missing: " << attrib.first << std::endl;
    }

-    if (model.textures.size() > 0) {
-      // fixme: Use material's baseColor
-      tinygltf::Texture &tex = model.textures[0];
+    GLuint texid;
+    glGenTextures(1, &texid);

-      if (tex.source > -1) {
+    tinygltf::Texture &tex = model.textures[0];
+    tinygltf::Image &image = model.images[tex.source];

-        GLuint texid;
-        glGenTextures(1, &texid);
+    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);

-        tinygltf::Image &image = model.images[tex.source];
+    GLenum format = GL_RGBA;

-        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));
-      }
+    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;
@@ -151,12 +144,8 @@ std::map<int, GLuint> bindMesh(std::map<int, GLuint> vbos,
 // bind models
 void bindModelNodes(std::map<int, GLuint> vbos, tinygltf::Model &model,
                    tinygltf::Node &node) {
-  if ((node.mesh >= 0) && (node.mesh < model.meshes.size())) {
-    bindMesh(vbos, model, model.meshes[node.mesh]);
-  }
-
+  bindMesh(vbos, model, model.meshes[node.mesh]);
  for (size_t i = 0; i < node.children.size(); i++) {
-    assert((node.children[i] >= 0) && (node.children[i] < model.nodes.size()));
    bindModelNodes(vbos, model, model.nodes[node.children[i]]);
  }
 }
@@ -168,7 +157,6 @@ GLuint bindModel(tinygltf::Model &model) {

  const tinygltf::Scene &scene = model.scenes[model.defaultScene];
  for (size_t i = 0; i < scene.nodes.size(); ++i) {
-    assert((scene.nodes[i] >= 0) && (scene.nodes[i] < model.nodes.size()));
    bindModelNodes(vbos, model, model.nodes[scene.nodes[i]]);
  }

@@ -194,9 +182,7 @@ void drawMesh(tinygltf::Model &model, tinygltf::Mesh &mesh) {

 // recursively draw node and children nodes of model
 void drawModelNodes(tinygltf::Model &model, tinygltf::Node &node) {
-  if ((node.mesh >= 0) && (node.mesh < model.meshes.size())) {
-    drawMesh(model, model.meshes[node.mesh]);
-  }
+  drawMesh(model, model.meshes[node.mesh]);
  for (size_t i = 0; i < node.children.size(); i++) {
    drawModelNodes(model, model.nodes[node.children[i]]);
  }
@@ -329,7 +315,7 @@ static void error_callback(int error, const char *description) {
 }

 int main(int argc, char **argv) {
-  std::string filename = "../../../models/Cube/Cube.gltf";
+  std::string filename = "../../models/Cube/Cube.gltf";

  if (argc > 1) {
    filename = argv[1];
@@ -341,12 +327,9 @@ int main(int argc, char **argv) {

  // Force create OpenGL 3.3
  // NOTE(syoyo): Linux + NVIDIA driver segfaults for some reason? commenting out glfwWindowHint will work.
-  // Note (PE): On laptops with intel hd graphics card you can overcome the segfault by enabling experimental, see below (tested on lenovo thinkpad)
  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
-  glewExperimental = GL_TRUE;
-
 #ifdef __APPLE__
  glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
 #endif
--- a/examples/build-gltf/Makefile
+++ b/examples/build-gltf/Makefile
@@ -1,2 +0,0 @@
-all:
-	$(CXX) -o create_triangle_gltf -I../../ create_triangle_gltf.cpp
--- a/examples/build-gltf/create_triangle_gltf.cpp
+++ b/examples/build-gltf/create_triangle_gltf.cpp
@@ -1,121 +0,0 @@
-// An example of how to generate a gltf file from scratch. This example
-// was translated from the pygltlib documentation in the pypi project page,
-// which in turn is based on the Khronos Sample Models at:
-//
-// https://github.com/KhronosGroup/glTF-Sample-Models
-//
-// This example is released under the MIT license. 
-//
-// 2021-02-25 Thu
-// Dov Grobgeld <dov.grobgeld@gmail.com>
-
-
-// Define these only in *one* .cc file.
-#define TINYGLTF_IMPLEMENTATION
-#define STB_IMAGE_IMPLEMENTATION
-#define STB_IMAGE_WRITE_IMPLEMENTATION
-
-// #define TINYGLTF_NOEXCEPTION // optional. disable exception handling.
-#include "tiny_gltf.h"
-
-int main(int argc, char **argv)
-{
-  // Create a model with a single mesh and save it as a gltf file
-  tinygltf::Model m;
-  tinygltf::Scene scene;
-  tinygltf::Mesh mesh;
-  tinygltf::Primitive primitive;
-  tinygltf::Node node;
-  tinygltf::Buffer buffer;
-  tinygltf::BufferView bufferView1;
-  tinygltf::BufferView bufferView2;
-  tinygltf::Accessor accessor1;
-  tinygltf::Accessor accessor2;
-  tinygltf::Asset asset;
-
-  // This is the raw data buffer. 
-  buffer.data = {
-    // 6 bytes of indices and two bytes of padding
-    0x00,0x00,0x01,0x00,0x02,0x00,0x00,0x00,
-    // 36 bytes of floating point numbers
-    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
-    0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x3f,
-    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
-    0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x3f,
-    0x00,0x00,0x00,0x00};
-
-  // "The indices of the vertices (ELEMENT_ARRAY_BUFFER) take up 6 bytes in the
-  // start of the buffer.
-  bufferView1.buffer = 0;
-  bufferView1.byteOffset=0;
-  bufferView1.byteLength=6;
-  bufferView1.target = TINYGLTF_TARGET_ELEMENT_ARRAY_BUFFER;
-
-  // The vertices take up 36 bytes (3 vertices * 3 floating points * 4 bytes)
-  // at position 8 in the buffer and are of type ARRAY_BUFFER
-  bufferView2.buffer = 0;
-  bufferView2.byteOffset=8;
-  bufferView2.byteLength=36;
-  bufferView2.target = TINYGLTF_TARGET_ARRAY_BUFFER;
-
-  // Describe the layout of bufferView1, the indices of the vertices
-  accessor1.bufferView = 0;
-  accessor1.byteOffset = 0;
-  accessor1.componentType = TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT;
-  accessor1.count = 3;
-  accessor1.type = TINYGLTF_TYPE_SCALAR;
-  accessor1.maxValues.push_back(2);
-  accessor1.minValues.push_back(0);
-
-  // Describe the layout of bufferView2, the vertices themself
-  accessor2.bufferView = 1;
-  accessor2.byteOffset = 0;
-  accessor2.componentType = TINYGLTF_COMPONENT_TYPE_FLOAT;
-  accessor2.count = 3;
-  accessor2.type = TINYGLTF_TYPE_VEC3;
-  accessor2.maxValues = {1.0, 1.0, 0.0};
-  accessor2.minValues = {0.0, 0.0, 0.0};
-
-  // Build the mesh primitive and add it to the mesh
-  primitive.indices = 0;                 // The index of the accessor for the vertex indices
-  primitive.attributes["POSITION"] = 1;  // The index of the accessor for positions
-  primitive.material = 0;
-  primitive.mode = TINYGLTF_MODE_TRIANGLES;
-  mesh.primitives.push_back(primitive);
-
-  // Other tie ups
-  node.mesh = 0;
-  scene.nodes.push_back(0); // Default scene
-
-  // Define the asset. The version is required
-  asset.version = "2.0";
-  asset.generator = "tinygltf";
-
-  // Now all that remains is to tie back all the loose objects into the
-  // our single model.
-  m.scenes.push_back(scene);
-  m.meshes.push_back(mesh);
-  m.nodes.push_back(node);
-  m.buffers.push_back(buffer);
-  m.bufferViews.push_back(bufferView1);
-  m.bufferViews.push_back(bufferView2);
-  m.accessors.push_back(accessor1);
-  m.accessors.push_back(accessor2);
-  m.asset = asset;
-
-  // Create a simple material
-  tinygltf::Material mat;
-  mat.pbrMetallicRoughness.baseColorFactor = {1.0f, 0.9f, 0.9f, 1.0f};  
-  mat.doubleSided = true;
-  m.materials.push_back(mat);
-
-  // Save it to a file
-  tinygltf::TinyGLTF gltf;
-  gltf.WriteGltfSceneToFile(&m, "triangle.gltf",
-                           true, // embedImages
-                           true, // embedBuffers
-                           true, // pretty print
-                           false); // write binary
-  
-  exit(0);
-}
--- a/examples/common/tiny_obj_loader.h
+++ b/examples/common/tiny_obj_loader.h
--- a/examples/dxview/CMakeLists.txt
+++ b/examples/dxview/CMakeLists.txt
@@ -1,36 +0,0 @@
-cmake_minimum_required(VERSION 3.5)
-project(dxview)
-
-find_package(glfw3 CONFIG REQUIRED)
-find_package(spdlog CONFIG REQUIRED)
-
-add_executable(dxview
-    src/Viewer.h
-    src/Viewer.cc
-    src/dxview.cc
-)
-
-target_include_directories(dxview
-PRIVATE
-    ../../
-)
-
-target_compile_definitions(dxview
-PRIVATE
-    DXVIEW_SWAP_CHAIN_BUFFER_COUNT=3
-    DXVIEW_RES_DIR=L"${PROJECT_SOURCE_DIR}/res"
-)
-
-target_link_libraries(dxview
-PRIVATE
-    dxgi
-    d3dcompiler
-    d3d12
-    glfw
-    spdlog::spdlog
-)
-
-set_target_properties(dxview
-PROPERTIES
-    CXX_STANDARD 17
-)
--- a/examples/dxview/README.md
+++ b/examples/dxview/README.md
@@ -1,37 +0,0 @@
-# DirectX glTF Viewer
-
-## Overview
-
-This project was motivated by a lack of sample code demonstrating the graphics API agnostic nature of the glTF specification. The sample code is written using modern C++ and DirectX 12 for the client application.
-
-## Features
-
-* [x] DirectX 12
-* [ ] Loader
-* [ ] Animation
-* [ ] Morph Target
-* [ ] Physical Base Rendering
-* [ ] Environment Map
-
-## Dependencies
-
-* [CMake](https://github.com/Kitware/CMake)
-* [Vcpkg](https://github.com/Microsoft/vcpkg)
-* [GLFW](https://github.com/glfw/glfw)
-* [spdlog](https://github.com/gabime/spdlog)
-
-## Building
-
-### Install dependencies
-
-```
-vcpkg install glfw3:x64-windows
-vcpkg install spdlog:x64-windows
-```
-
-### Generate Project Files
-
-```
-mkdir build
-cmake . -B build -DCMAKE_TOOLCHAIN_FILE=${VCPKG_DIR}/script/buildsystem/vcpkg.cmake
-```
--- a/examples/dxview/res/gray.hlsl
+++ b/examples/dxview/res/gray.hlsl
@@ -1,3 +0,0 @@
-float4 main() : SV_Target {
-    return float4(0.5, 0.5, 0.5, 1.0);
-}
--- a/examples/dxview/res/lighting.hlsl
+++ b/examples/dxview/res/lighting.hlsl
@@ -1,52 +0,0 @@
-struct RS2PS {
-    float4 position : SV_POSITION;
-
-#ifdef HAS_TEXCOORD_0
-    float2 texcoord_0: TEXCOORD_0;
-#endif
-};
-
-struct TextureInfo {
-    uint textureIndex;
-    uint samplerIndex;
-};
-
-struct PBRMetallicRoughness {
-    float4 baseColorFactor;
-    TextureInfo baseColorTexture;
-    float metallicFactor;
-    float roughnessFactor;
-    TextureInfo metallicRoughnessTexture;
-};
-
-cbuffer Material : register(b2) {
-    PBRMetallicRoughness pbrMetallicRoughness;
-};
-
-Texture2D textures[5] : register(t0);
-SamplerState samplerState[5] : register(s0);
-
-float4 getBaseColor(float2 uv) {
-    float4 baseColor = pbrMetallicRoughness.baseColorFactor;
-
-#ifdef HAS_TEXCOORD_0
-    TextureInfo baseColorTexture = pbrMetallicRoughness.baseColorTexture;
-    if (baseColorTexture.textureIndex >= 0) {
-        baseColor *= textures[baseColorTexture.textureIndex].Sample(samplerState[baseColorTexture.samplerIndex], uv);
-    }
-#endif
-
-    return baseColor;
-}
-
-float4 main(RS2PS input) : SV_Target {
-    float2 uv = float2(0.0, 0.0);
-
-#ifdef HAS_TEXCOORD_0
-    uv = input.texcoord_0;
-#endif
-
-    float4 color = getBaseColor(uv);
-
-    return color;
-}
--- a/examples/dxview/res/primitive.hlsl
+++ b/examples/dxview/res/primitive.hlsl
@@ -1,46 +0,0 @@
-struct IA2VS {
-    float3 position  : POSITION;
-
-#ifdef HAS_NORMAL
-    float3 normal : NORMAL;
-#endif
-
-#ifdef HAS_TANGENT
-    float4 tangent : TANGENT;
-#endif
-
-#ifdef HAS_TEXCOORD_0
-    float2 texcoord_0: TEXCOORD_0;
-#endif
-};
-
-struct VS2RS {
-    float4 position : SV_POSITION;
-
-#ifdef HAS_TEXCOORD_0
-    float2 texcoord_0: TEXCOORD_0;
-#endif
-};
-
-cbuffer Camera : register(b0) {
-    float4x4 V;
-    float4x4 P;
-    float4x4 VP;
-};
-
-cbuffer Node : register(b1) {
-    float4x4 M;
-};
-
-VS2RS main(IA2VS input) {
-    VS2RS output;
-    output.position = mul(float4(input.position, 1.0), M);
-    output.position = mul(output.position, V);
-    output.position = mul(output.position, P);
-
-#ifdef HAS_TEXCOORD_0
-    output.texcoord_0 = input.texcoord_0;
-#endif
-
-    return output;
-}
--- a/examples/dxview/src/Viewer.cc
+++ b/examples/dxview/src/Viewer.cc
--- a/examples/dxview/src/Viewer.h
+++ b/examples/dxview/src/Viewer.h
@@ -1,130 +0,0 @@
-#ifndef DXVIEW_VIEWER_GUARD
-#define DXVIEW_VIEWER_GUARD
-
-#include <DirectXMath.h>
-#include <d3d12.h>
-#include <dxgi1_6.h>
-#include <tiny_gltf.h>
-#include <wrl.h>
-
-#include <filesystem>
-#include <map>
-#include <string>
-#include <vector>
-
-using Microsoft::WRL::ComPtr;
-
-enum RenderPassType { RENDER_PASS_TYPE_PRESENT = 0, RENDER_PASS_TYPE_COUNT };
-
-struct RenderTarget {
-  ComPtr<ID3D12Resource> pTexture;
-  D3D12_CPU_DESCRIPTOR_HANDLE viewDescriptor;
-};
-
-struct TextureInfo {
-  int32_t textureIndex;
-  int32_t samplerIndex;
-};
-
-struct PBRMetallicRoughness {
-  DirectX::XMFLOAT4 baseColorFactor;
-  TextureInfo baseColorTexture;
-  float metallicFactor;
-  float roughnessFactor;
-  TextureInfo metallicRoughnessTexture;
-};
-
-struct Material {
-  std::string name;
-  D3D12_BLEND_DESC blendDesc;
-  D3D12_RASTERIZER_DESC rasterizerDesc;
-  ComPtr<ID3D12Resource> pBuffer;
-  void* pBufferData;
-  ComPtr<ID3D12DescriptorHeap> pSRVDescriptorHeap;
-  ComPtr<ID3D12DescriptorHeap> pSamplerDescriptorHeap;
-};
-
-struct Attribute {
-  std::string name;
-  DXGI_FORMAT format;
-  D3D12_VERTEX_BUFFER_VIEW vertexBufferView;
-};
-
-struct Primitive {
-  std::vector<Attribute> attributes;
-  uint32_t vertexCount;
-  D3D12_PRIMITIVE_TOPOLOGY primitiveTopology;
-  D3D12_INDEX_BUFFER_VIEW indexBufferView;
-  uint32_t indexCount;
-  Material* pMaterial;
-  ComPtr<ID3D12RootSignature> pRootSignature;
-  ComPtr<ID3D12PipelineState> pPipelineState;
-};
-
-struct Mesh {
-  std::string name;
-  std::vector<Primitive> primitives;
-};
-
-struct Node {
-  DirectX::XMFLOAT4X4 M;
-};
-
-struct Camera {
-  DirectX::XMFLOAT4X4 V;
-  DirectX::XMFLOAT4X4 P;
-  DirectX::XMFLOAT4X4 VP;
-};
-
-class Viewer {
- public:
-  Viewer(HWND window, tinygltf::Model* pModel);
-
-  void update(double deltaTime);
-  void render(double deltaTime);
-
- private:
-  void initDirectX(HWND window);
-  void buildRenderTargets();
-  void buildResources();
-  void buildBuffers(std::vector<ComPtr<ID3D12Resource> >* pStagingResources);
-  void buildImages(std::vector<ComPtr<ID3D12Resource> >* pStagingResources);
-  void buildSamplerDescs();
-  void buildMaterials();
-  void buildMeshes();
-  void buildNodes();
-
-  void drawNode(uint64_t nodeIndex);
-
- private:
-  tinygltf::Model* pModel_;
-  ComPtr<IDXGIFactory1> pFactory_;
-  ComPtr<IDXGIAdapter1> pAdapter_;
-  ComPtr<ID3D12Device> pDevice_;
-  ComPtr<ID3D12CommandQueue> pDirectCommandQueue_;
-  UINT64 directFenceValue_;
-  ComPtr<ID3D12Fence> pDirectFence_;
-  ComPtr<ID3D12CommandQueue> pCopyCommandQueue_;
-  UINT64 copyFenceValue_;
-  ComPtr<ID3D12Fence> pCopyFence_;
-  ComPtr<IDXGISwapChain3> pSwapChain_;
-  ComPtr<ID3D12Resource> pSwapChainBuffers_[DXVIEW_SWAP_CHAIN_BUFFER_COUNT];
-  ComPtr<ID3D12CommandAllocator>
-      pDirectCommandAllocators_[DXVIEW_SWAP_CHAIN_BUFFER_COUNT];
-  ComPtr<ID3D12GraphicsCommandList> pDirectCommandList_;
-  ComPtr<ID3D12CommandAllocator> pCopyCommandAllocator_;
-  ComPtr<ID3D12GraphicsCommandList> pCopyCommandList_;
-  UINT descriptorIncrementSize_[D3D12_DESCRIPTOR_HEAP_TYPE_NUM_TYPES];
-  ComPtr<ID3D12DescriptorHeap>
-      pRTVDescriptorHeaps_[DXVIEW_SWAP_CHAIN_BUFFER_COUNT];
-  std::vector<RenderTarget> renderTargets_[DXVIEW_SWAP_CHAIN_BUFFER_COUNT];
-  std::vector<ComPtr<ID3D12Resource> > pBuffers_;
-  std::vector<ComPtr<ID3D12Resource> > pTextures_;
-  std::vector<D3D12_SAMPLER_DESC> samplerDescs_;
-  std::vector<Material> materials_;
-  std::vector<Mesh> meshes_;
-  std::vector<ComPtr<ID3D12Resource> > pNodeBuffers_;
-  ComPtr<ID3D12Resource> pCameraBuffer_;
-};
-
-#endif
--- a/examples/dxview/src/dxview.cc
+++ b/examples/dxview/src/dxview.cc
@@ -1,90 +0,0 @@
-#define GLFW_EXPOSE_NATIVE_WIN32
-#define TINYGLTF_IMPLEMENTATION
-#define STBI_MSC_SECURE_CRT
-#define STB_IMAGE_IMPLEMENTATION
-#define STB_IMAGE_WRITE_IMPLEMENTATION
-
-#include <GLFW/glfw3.h>
-#include <GLFW/glfw3native.h>
-#include <spdlog/spdlog.h>
-#include <tiny_gltf.h>
-
-#undef GLFW_EXPOSE_NATIVE_WIN32
-#undef TINYGLTF_IMPLEMENTATION
-#undef STBI_MSC_SECURE_CRT
-#undef STB_IMAGE_IMPLEMENTATION
-#undef STB_IMAGE_WRITE_IMPLEMENTATION
-
-#include <iostream>
-#include <string>
-
-#include "Viewer.h"
-
-static void onError(int error, const char* message) {
-  spdlog::error("[{}] {}", error, message);
-}
-
-static void onRender(Viewer* pViewer, double deltaTime) {
-  pViewer->update(deltaTime);
-  pViewer->render(deltaTime);
-}
-
-int main(int argc, char* argv[]) {
-  tinygltf::TinyGLTF context;
-
-  tinygltf::Model model;
-  std::string error;
-  std::string warning;
-  if (!context.LoadASCIIFromFile(&model, &error, &warning, argv[1])) {
-    if (!error.empty()) {
-      spdlog::error("{}", error);
-    }
-
-    if (!warning.empty()) {
-      spdlog::warn("{}", warning);
-    }
-
-    exit(EXIT_FAILURE);
-  }
-
-  GLFWwindow* pWindow;
-
-  glfwSetErrorCallback(onError);
-
-  if (!glfwInit()) {
-    spdlog::error("Fail to initialize GLFW!!!");
-    exit(EXIT_FAILURE);
-  }
-
-  glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
-  glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);
-
-  pWindow = glfwCreateWindow(512, 512, "dxview", nullptr, nullptr);
-  if (!pWindow) {
-    spdlog::error("Fail to create GLFWwindow!!!");
-    glfwTerminate();
-    exit(EXIT_FAILURE);
-  }
-
-  auto pViewer = std::make_unique<Viewer>(glfwGetWin32Window(pWindow), &model);
-  if (!pViewer) {
-    spdlog::error("Fail to create Viewer");
-    glfwDestroyWindow(pWindow);
-    glfwTerminate();
-    exit(EXIT_FAILURE);
-  }
-
-  auto prevTimeStamp = glfwGetTime();
-  while (!glfwWindowShouldClose(pWindow)) {
-    auto currTimeStamp = glfwGetTime();
-
-    onRender(pViewer.get(), currTimeStamp - prevTimeStamp);
-    prevTimeStamp = currTimeStamp;
-
-    glfwPollEvents();
-  }
-
-  glfwDestroyWindow(pWindow);
-  glfwTerminate();
-  exit(EXIT_SUCCESS);
-}
--- a/examples/mesh-modify/Makefile
+++ b/examples/mesh-modify/Makefile
@@ -0,0 +1,5 @@
+#EXTRA_CXXFLAGS := -fsanitize=address -fno-omit-frame-pointer -Wall -Werror -Weverything -Wno-c++11-long-long -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-padded
+EXTRA_CXXFLAGS :=
+
+all:
+	clang++ -std=c++11 -g -O1 -I../../ -I../common $(EXTRA_CXXFLAGS) -o mesh-modify mesh-modify.cc mesh-util.cc tinygltf_impl.cc
--- a/examples/mesh-modify/README.md
+++ b/examples/mesh-modify/README.md
@@ -0,0 +1,13 @@
+# Mesh modify experiment
+
+Sometimes we want to tweak mesh attributes(e.g. vertex position, uv coord, etc).
+glTF itself does not allow ASCII representation of such data.
+
+This example show how to
+
+- Export mesh data from .bin to .obj
+- Import mesh data to .bin(update corresponding buffer data) from .obj
+
+## Requirement
+
+Assume Buffer is stored as external file(`.bin`)
--- a/examples/mesh-modify/mesh-modify.cc
+++ b/examples/mesh-modify/mesh-modify.cc
@@ -0,0 +1,760 @@
+#include <cassert>
+#include <cmath>
+#include <cstdio>
+#include <cstdlib>
+#include <iostream>
+#include <limits>
+#include <string>
+#include <vector>
+#include <fstream>
+
+#if !defined(__ANDROID__) && !defined(_WIN32)
+#include <wordexp.h>
+#endif
+
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Weverything"
+#endif
+
+#include "../../json.hpp"
+
+using json = nlohmann::json;
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
+#ifdef _WIN32
+#include "../../tiny_gltf.h"
+#else
+#include "tiny_gltf.h"
+#endif
+
+#include "mesh-util.hh"
+
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wunused-function"
+#endif
+
+namespace {
+
+static std::string PrintMode(int mode) {
+  if (mode == TINYGLTF_MODE_POINTS) {
+    return "POINTS";
+  } else if (mode == TINYGLTF_MODE_LINE) {
+    return "LINE";
+  } else if (mode == TINYGLTF_MODE_LINE_LOOP) {
+    return "LINE_LOOP";
+  } else if (mode == TINYGLTF_MODE_TRIANGLES) {
+    return "TRIANGLES";
+  } else if (mode == TINYGLTF_MODE_TRIANGLE_FAN) {
+    return "TRIANGLE_FAN";
+  } else if (mode == TINYGLTF_MODE_TRIANGLE_STRIP) {
+    return "TRIANGLE_STRIP";
+  }
+  return "**UNKNOWN**";
+}
+
+static std::string PrintTarget(int target) {
+  if (target == 34962) {
+    return "GL_ARRAY_BUFFER";
+  } else if (target == 34963) {
+    return "GL_ELEMENT_ARRAY_BUFFER";
+  } else {
+    return "**UNKNOWN**";
+  }
+}
+
+static std::string PrintType(int ty) {
+  if (ty == TINYGLTF_TYPE_SCALAR) {
+    return "SCALAR";
+  } else if (ty == TINYGLTF_TYPE_VECTOR) {
+    return "VECTOR";
+  } else if (ty == TINYGLTF_TYPE_VEC2) {
+    return "VEC2";
+  } else if (ty == TINYGLTF_TYPE_VEC3) {
+    return "VEC3";
+  } else if (ty == TINYGLTF_TYPE_VEC4) {
+    return "VEC4";
+  } else if (ty == TINYGLTF_TYPE_MATRIX) {
+    return "MATRIX";
+  } else if (ty == TINYGLTF_TYPE_MAT2) {
+    return "MAT2";
+  } else if (ty == TINYGLTF_TYPE_MAT3) {
+    return "MAT3";
+  } else if (ty == TINYGLTF_TYPE_MAT4) {
+    return "MAT4";
+  }
+  return "**UNKNOWN**";
+}
+
+static std::string PrintComponentType(int ty) {
+  if (ty == TINYGLTF_COMPONENT_TYPE_BYTE) {
+    return "BYTE";
+  } else if (ty == TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE) {
+    return "UNSIGNED_BYTE";
+  } else if (ty == TINYGLTF_COMPONENT_TYPE_SHORT) {
+    return "SHORT";
+  } else if (ty == TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT) {
+    return "UNSIGNED_SHORT";
+  } else if (ty == TINYGLTF_COMPONENT_TYPE_INT) {
+    return "INT";
+  } else if (ty == TINYGLTF_COMPONENT_TYPE_UNSIGNED_INT) {
+    return "UNSIGNED_INT";
+  } else if (ty == TINYGLTF_COMPONENT_TYPE_FLOAT) {
+    return "FLOAT";
+  } else if (ty == TINYGLTF_COMPONENT_TYPE_DOUBLE) {
+    return "DOUBLE";
+  }
+
+  return "**UNKNOWN**";
+}
+
+#if 0
+// TODO(syoyo): Support sparse accessor(sparse vertex attribute).
+// TODO(syoyo): Support more data type
+struct VertexAttrib {
+  std::string name;
+
+  // Value are converted to float type.
+  std::vector<float> data;
+
+  // Corresponding info in binary data
+  int data_type;       // e.g. TINYGLTF_TYPE_VEC2
+  int component_type;  // storage type. e.g.
+                       // TINYGLTF_COMPONENT_TYPE_UNSIGNED_INT
+  uint64_t buffer_offset{0};
+  size_t buffer_length{0};
+};
+
+struct MeshPrim {
+  std::string name;
+  int32_t id{-1};
+
+  int mode{TINYGLTF_MODE_TRIANGLES};
+
+  VertexAttrib position;                  // vec3
+  VertexAttrib normal;                    // vec3
+  VertexAttrib tangent;                   // vec4
+  VertexAttrib color;                     // vec3 or vec4
+  std::map<int, VertexAttrib> texcoords;  // <slot, attrib>  vec2
+  std::map<int, VertexAttrib> weights;    // <slot, attrib>
+  std::map<int, VertexAttrib>
+      joints;  // <slot, attrib> store data as float type
+
+  int indices_type{-1}; // storage type(componentType) of `indices`.
+  std::vector<uint32_t> indices; // vertex indices
+};
+#endif
+
+#if 0
+static std::string GetFilePathExtension(const std::string &FileName) {
+  if (FileName.find_last_of(".") != std::string::npos)
+    return FileName.substr(FileName.find_last_of(".") + 1);
+  return "";
+}
+#endif
+
+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;
+  }
+}
+
+std::vector<uint8_t> LoadBin(const std::string &filename) {
+  std::vector<uint8_t> data;
+
+  std::ifstream is(filename, std::ios::binary | std::ios::in | std::ios::ate);
+
+  if (is.is_open()) {
+    size_t size = size_t(is.tellg());
+    is.seekg(0, std::ios::beg);
+    if (size < 4) {
+      std::cerr << "File size is zero or too short: " << size << "\n";
+      return data;
+    }
+
+    data.resize(size);
+    is.read(reinterpret_cast<char *>(data.data()), std::streamsize(size));
+  }
+
+  return data;
+}
+
+// TODO(syoyo): Use C++17 like filesystem library
+
+bool FileExists(const std::string &abs_filename) {
+  bool ret;
+#ifdef _WIN32
+  // TODO(syoyo): Support utf8 filepath
+  FILE *fp = nullptr;
+  errno_t err = fopen_s(&fp, abs_filename.c_str(), "rb");
+  if (err != 0) {
+    return false;
+  }
+#else
+  FILE *fp = fopen(abs_filename.c_str(), "rb");
+#endif
+  if (fp) {
+    ret = true;
+    fclose(fp);
+  } else {
+    ret = false;
+  }
+
+  return ret;
+}
+
+static std::string JoinPath(const std::string &path0,
+                            const std::string &path1) {
+  if (path0.empty()) {
+    return path1;
+  } else {
+    // check '/'
+    char lastChar = *path0.rbegin();
+    if (lastChar != '/') {
+      return path0 + std::string("/") + path1;
+    } else {
+      return path0 + path1;
+    }
+  }
+}
+
+std::string ExpandFilePath(const std::string &filepath) {
+#ifdef _WIN32
+  DWORD len = ExpandEnvironmentStringsA(filepath.c_str(), NULL, 0);
+  char *str = new char[len];
+  ExpandEnvironmentStringsA(filepath.c_str(), str, len);
+
+  std::string s(str);
+
+  delete[] str;
+
+  return s;
+#else
+
+#if defined(TARGET_OS_IPHONE) || defined(TARGET_IPHONE_SIMULATOR) || \
+    defined(__ANDROID__) || defined(__EMSCRIPTEN__)
+  // no expansion
+  std::string s = filepath;
+#else
+  std::string s;
+  wordexp_t p;
+
+  if (filepath.empty()) {
+    return "";
+  }
+
+  // Quote the string to keep any spaces in filepath intact.
+  std::string quoted_path = "\"" + filepath + "\"";
+  // char** w;
+  int ret = wordexp(quoted_path.c_str(), &p, 0);
+  if (ret) {
+    // err
+    s = filepath;
+    return s;
+  }
+
+  // Use first element only.
+  if (p.we_wordv) {
+    s = std::string(p.we_wordv[0]);
+    wordfree(&p);
+  } else {
+    s = filepath;
+  }
+
+#endif
+
+  return s;
+#endif
+}
+
+static std::string FindFile(const std::vector<std::string> &paths,
+                            const std::string &filepath) {
+  for (size_t i = 0; i < paths.size(); i++) {
+    std::string absPath = ExpandFilePath(JoinPath(paths[i], filepath));
+    if (FileExists(absPath)) {
+      return absPath;
+    }
+  }
+
+  return std::string();
+}
+
+#if 0
+static std::string GetBaseDir(const std::string &filepath) {
+  if (filepath.find_last_of("/\\") != std::string::npos)
+    return filepath.substr(0, filepath.find_last_of("/\\"));
+  return "";
+}
+#endif
+
+static int GetSlotId(const std::string &name) {
+  if (name.rfind("TEXCOORD_", 0) == 0) {
+    int id = 0;
+    sscanf(name.c_str(), "TEXCOORD_%d", &id);
+    return id;
+  } else if (name.rfind("WEIGHTS_", 0) == 0) {
+    int id = 0;
+    sscanf(name.c_str(), "WEIGHTS_%d", &id);
+    return id;
+  } else if (name.rfind("JOINTS_", 0) == 0) {
+    int id = 0;
+    sscanf(name.c_str(), "JOINTS_%d", &id);
+    return id;
+  }
+
+  return -1;
+}
+
+static bool IsAttributeSupported(const std::string &name) {
+  constexpr int max_slots = 8;
+
+  if (name.compare("POSITION") == 0) {
+    return true;
+  }
+
+  if (name.compare("NORMAL") == 0) {
+    return true;
+  }
+
+  if (name.compare("TANGENT") == 0) {
+    return true;
+  }
+
+  for (int i = 0; i < max_slots; i++) {
+    std::string n = "TEXCOORD_" + std::to_string(i);
+    if (n.compare(name) == 0) {
+      return true;
+    }
+  }
+
+  for (int i = 0; i < max_slots; i++) {
+    std::string n = "WEIGHTS_" + std::to_string(i);
+    if (n.compare(name) == 0) {
+      return true;
+    }
+  }
+
+  for (int i = 0; i < max_slots; i++) {
+    std::string n = "JOINTS_" + std::to_string(i);
+    if (n.compare(name) == 0) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+static float Unpack(const unsigned char *ptr, int type) {
+  if (type == TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE) {
+    unsigned char data = *ptr;
+    return float(data);
+  } else if (type == TINYGLTF_COMPONENT_TYPE_BYTE) {
+    char data = static_cast<char>(*ptr);
+    return float(data);
+  } else if (type == TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT) {
+    uint16_t data = *reinterpret_cast<const uint16_t *>(ptr);
+    return float(data);
+  } else if (type == TINYGLTF_COMPONENT_TYPE_SHORT) {
+    int16_t data = *reinterpret_cast<const int16_t *>(ptr);
+    return float(data);
+  } else if (type == TINYGLTF_COMPONENT_TYPE_FLOAT) {
+    float data = *reinterpret_cast<const float *>(ptr);
+    return data;
+  } else {
+    std::cerr << "???: Unsupported type: " << PrintComponentType(type) << "\n";
+    return 0.0f;
+  }
+}
+
+static uint32_t UnpackIndex(const unsigned char *ptr, int type) {
+  if (type == TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE) {
+    unsigned char data = *ptr;
+    return uint32_t(data);
+  } else if (type == TINYGLTF_COMPONENT_TYPE_BYTE) {
+    char data = static_cast<char>(*ptr);
+    return uint32_t(data);
+  } else if (type == TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT) {
+    uint16_t data = *reinterpret_cast<const uint16_t *>(ptr);
+    return uint32_t(data);
+  } else if (type == TINYGLTF_COMPONENT_TYPE_SHORT) {
+    int16_t data = *reinterpret_cast<const int16_t *>(ptr);
+    return uint32_t(data);
+  } else if (type == TINYGLTF_COMPONENT_TYPE_INT) {
+    // TODO(syoyo): Check overflow(2G+ index)
+    int32_t data = *reinterpret_cast<const int32_t *>(ptr);
+    return uint32_t(data);
+  } else if (type == TINYGLTF_COMPONENT_TYPE_SHORT) {
+    uint32_t data = *reinterpret_cast<const uint32_t *>(ptr);
+    return data;
+  } else {
+    std::cerr << "???: Unsupported type: " << PrintComponentType(type) << "\n";
+    return static_cast<uint32_t>(-1);
+  }
+}
+
+static bool DumpMesh(const tinygltf::Model &model, const tinygltf::Mesh &mesh,
+                     example::MeshPrim *out) {
+  for (size_t i = 0; i < mesh.primitives.size(); i++) {
+    const tinygltf::Primitive &primitive = mesh.primitives[i];
+
+    if (primitive.indices < 0) {
+      std::cerr << "Primitive indices must be provided\n";
+      return false;
+    }
+
+    // indices.
+    {
+      const tinygltf::Accessor &indexAccessor =
+        model.accessors[size_t(primitive.indices)];
+
+      size_t num_elements = indexAccessor.count;
+      std::cout << "index.elements = " << num_elements << "\n";
+
+      size_t byte_stride = ComponentTypeByteSize(indexAccessor.componentType);
+
+      const tinygltf::BufferView &indexBufferView =
+           model.bufferViews[size_t(indexAccessor.bufferView)];
+
+      // should be 34963(ELEMENT_ARRAY_BUFFER)
+      std::cout << "index.target = " << PrintTarget(indexBufferView.target) << "\n";
+      if (indexBufferView.target != TINYGLTF_TARGET_ELEMENT_ARRAY_BUFFER) {
+        std::cerr << "indexBufferView.target must be ELEMENT_ARRAY_BUFFER\n";
+        return false;
+      }
+
+      const tinygltf::Buffer &indexBuffer =
+          model.buffers[size_t(indexBufferView.buffer)];
+
+      std::vector<uint32_t> indices;
+
+      for (size_t k = 0; k < num_elements; k++) {
+
+        // TODO(syoyo): out-of-bounds check.
+        const unsigned char *ptr = indexBuffer.data.data() +
+                                   indexBufferView.byteOffset + (k * byte_stride) +
+                                   indexAccessor.byteOffset;
+
+        uint32_t idx = UnpackIndex(ptr, indexAccessor.componentType);
+
+        std::cout << "vertex_index[" << k << "] = " << idx << "\n";
+
+        indices.push_back(idx);
+      }
+
+      out->indices = indices;
+      out->indices_type = indexAccessor.componentType;
+    }
+
+    // attributes
+    {
+      std::map<std::string, int>::const_iterator it(
+          primitive.attributes.begin());
+      std::map<std::string, int>::const_iterator itEnd(
+          primitive.attributes.end());
+
+      for (; it != itEnd; it++) {
+        // it->first would be "POSITION", "NORMAL", "TEXCOORD_0", ...
+        if (!IsAttributeSupported(it->first)) {
+          std::cout << "Unsupported attribute: " << it->first << "\n";
+          continue;
+        }
+
+        if (size_t(it->second) >= model.accessors.size()) {
+          std::cerr << "Invalid accessor id: " << it->second << "\n";
+          return false;
+        }
+
+        const tinygltf::Accessor &accessor =
+            model.accessors[size_t(it->second)];
+
+        size_t elem_size = 1;
+        if (accessor.type == TINYGLTF_TYPE_SCALAR) {
+          elem_size = 1;
+        } else if (accessor.type == TINYGLTF_TYPE_VEC2) {
+          elem_size = 2;
+        } else if (accessor.type == TINYGLTF_TYPE_VEC3) {
+          elem_size = 3;
+        } else if (accessor.type == TINYGLTF_TYPE_VEC4) {
+          elem_size = 4;
+        } else {
+          std::cerr << "Invalid or unsupported accessor type: "
+                    << PrintType(accessor.type) << "\n";
+          return false;
+        }
+
+        std::cout << PrintComponentType(accessor.componentType) << "\n";
+
+        size_t byte_stride = ComponentTypeByteSize(accessor.componentType);
+
+        std::cout << "attribute: " << it->first << "\n";
+        // if (gGLProgramState.attribs[it->first] >= 0) {
+        // Compute byteStride from Accessor + BufferView combination.
+        int byteStride =
+            accessor.ByteStride(model.bufferViews[size_t(accessor.bufferView)]);
+        assert(byteStride != -1);
+
+        std::cout << "byteOffset: " << accessor.byteOffset << "\n";
+
+        const tinygltf::BufferView &bufferView =
+            model.bufferViews[size_t(accessor.bufferView)];
+        const tinygltf::Buffer &buffer =
+            model.buffers[size_t(bufferView.buffer)];
+
+        size_t num_elems = accessor.count * elem_size;
+
+        example::VertexAttrib attrib;
+        for (size_t k = 0; k < num_elems; k++) {
+          // TODO(syoyo): out-of-bounds check.
+          const unsigned char *ptr = buffer.data.data() +
+                                     bufferView.byteOffset + (k * byte_stride) +
+                                     accessor.byteOffset;
+          float value = Unpack(ptr, accessor.componentType);
+          std::cout << "[" << k << "] value = " << value << "\n";
+          attrib.data.push_back(value);
+        }
+        attrib.component_type = accessor.componentType;
+        attrib.data_type = accessor.type;
+        attrib.name = it->first;
+
+        if (attrib.name.compare("POSITION") == 0) {
+          out->position = attrib;
+        } else if (attrib.name.compare("NORMAL") == 0) {
+          out->normal = attrib;
+        } else if (attrib.name.compare("TANGENT") == 0) {
+          out->tangent = attrib;
+        } else if (attrib.name.rfind("TEXCOORD_", 0) == 0) {
+          int id = GetSlotId(attrib.name);
+          std::cout << "texcoord[" << id << "]\n";
+          out->texcoords[id] = attrib;
+        } else if (attrib.name.rfind("JOINTS_", 0) == 0) {
+          int id = GetSlotId(attrib.name);
+          std::cout << "joints[" << id << "]\n";
+          out->joints[id] = attrib;
+        } else if (attrib.name.rfind("WEIGHTS_", 0) == 0) {
+          int id = GetSlotId(attrib.name);
+          std::cout << "weights[" << id << "]\n";
+          out->weights[id] = attrib;
+        } else {
+          std::cerr << "???: attrib.name = " << attrib.name << "\n";
+          return false;
+        }
+
+      }
+    }
+
+    const tinygltf::Accessor &indexAccessor =
+        model.accessors[size_t(primitive.indices)];
+    (void)indexAccessor;
+    PrintMode(primitive.mode);
+    if (primitive.mode != TINYGLTF_MODE_TRIANGLES) {
+      std::cerr << "Supported Primitive mode is TRIANGLES only at the moment\n";
+      return false;
+    }
+
+    out->mode = primitive.mode;
+    out->name = mesh.name;
+  }
+
+  return true;
+}
+
+#if 0
+static bool ExtractMesh(const std::string &asset_path, tinygltf::Model &model,
+                        std::vector<example::MeshPrim> *outs) {
+  // Get .bin data
+  {
+    if (model.buffers.size() != 1) {
+      std::cerr << "Single element of `buffers` is supported at the moment.\n";
+      return false;
+    }
+
+    const tinygltf::Buffer &buffer = model.buffers[0];
+    if (buffer.uri.empty()) {
+      std::cerr << "buffer.uri must be a filepath.\n";
+      return false;
+    }
+
+    if (buffer.data.size() < 4) {
+      std::cerr << "Invalid buffer.byteLength.\n";
+      return false;
+    }
+
+    std::vector<std::string> search_paths;
+    search_paths.push_back(asset_path);
+
+    std::string abs_filepath = FindFile(search_paths, buffer.uri);
+    std::vector<uint8_t> bin = LoadBin(buffer.uri);
+    if (bin.size() != buffer.data.size()) {
+      std::cerr << "Byte size mismatch. Failed to load file: " << buffer.uri
+                << "\n";
+      std::cerr << "  .bin size = " << bin.size() << ", size in 'buffer.uri' = " << buffer.data.size() << "\n";
+      return false;
+    }
+  }
+
+  for (const auto &mesh : model.meshes) {
+    std::cout << "mesh.name: " << mesh.name << "\n";
+
+    example::MeshPrim output;
+    bool ret = DumpMesh(model, mesh, &output);
+    if (!ret) {
+      return false;
+    }
+
+    outs->push_back(output);
+  }
+
+  return true;
+}
+#endif
+
+}  // namespace
+
+int main(int argc, char **argv) {
+  if (argc < 2) {
+    std::cout << "mesh-dump input.gltf" << std::endl;
+  }
+
+#if 0
+
+  tinygltf::Model model;
+  tinygltf::TinyGLTF loader;
+  std::string err;
+  std::string warn;
+
+#ifdef _WIN32
+  std::string input_filename(argv[1] ? argv[1]
+                                     : "../../../models/Cube/Cube.gltf");
+#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, &warn,
+                                      input_filename.c_str());
+    } else {
+      // assume ascii glTF.
+      ret =
+          loader.LoadASCIIFromFile(&model, &err, &warn, input_filename.c_str());
+    }
+
+    if (!warn.empty()) {
+      printf("Warn: %s\n", warn.c_str());
+    }
+
+    if (!err.empty()) {
+      printf("ERR: %s\n", err.c_str());
+    }
+    if (!ret) {
+      printf("Failed to load .glTF : %s\n", argv[1]);
+      exit(-1);
+    }
+  }
+
+  json j;
+  {
+    std::ifstream i(input_filename);
+    i >> j;
+  }
+  std::cout << "j = " << j << "\n";
+
+  json j_patch = R"([
+    { "op": "add", "path": "/buffers/-", "value": {
+            "name": "plane/data",
+            "byteLength": 480,
+            "uri": "plane1.bin"
+        } }
+  ])"_json;
+
+  // a JSON value
+  json j_original = R"({
+    "baz": ["one", "two", "three"],
+    "foo": "bar"
+  })"_json;
+
+  //json j_patch = R"([
+  //  { "op": "remove", "path": "/buffers" }
+  //])"_json;
+
+  std::cout << "patch = " << j_patch.dump(2) << "\n";
+
+  json j_ret = j.patch(j_patch);
+  std::cout << "patched = " << j_ret.dump(2) << "\n";
+
+  std::string basedir = GetBaseDir(input_filename);
+  std::vector<example::MeshPrim> meshes;
+  bool ret = ExtractMesh(basedir, model, &meshes);
+
+  size_t n = 0;
+  for (const auto &mesh : meshes) {
+    // Assume no duplicated name in .glTF data
+    std::string filename;
+    if (mesh.name.empty()) {
+      filename = "untitled-" + std::to_string(n) + ".obj";
+    } else {
+      filename = mesh.name + ".obj";
+    }
+
+    bool flip_y = true; // flip texcoord Y?
+    bool ok = example::SaveAsObjMesh(filename, mesh,);
+    if (!ok) {
+      return EXIT_FAILURE;
+    }
+    n++;
+  }
+
+  return ret ? EXIT_SUCCESS : EXIT_FAILURE;
+#else
+
+  {
+    std::string input_filename(argv[1]);
+
+    // Require facevarying layout?
+    // false = try to keep GL-like mesh data as much as possible.
+    // true = reorder vertex data and re-assign vertex indices.
+    bool facevarying = false;
+
+    example::MeshPrim mesh;
+    bool ok = example::LoadObjMesh(input_filename, facevarying, &mesh);
+    if (!ok) {
+      return EXIT_FAILURE;
+    }
+
+    PrintMeshPrim(mesh);
+
+    std::string output_filename("output.gltf");
+
+    ok = example::SaveAsGLTFMesh(output_filename, mesh);
+    if (!ok) {
+      std::cerr << "Failed to save mesh as glTF\n";
+      return EXIT_FAILURE;
+    }
+    std::cout << "Write glTF: " << output_filename << "\n";
+  }
+
+  return EXIT_SUCCESS;
+#endif
+
+}
--- a/examples/mesh-modify/mesh-util.cc
+++ b/examples/mesh-modify/mesh-util.cc
--- a/examples/mesh-modify/mesh-util.hh
+++ b/examples/mesh-modify/mesh-util.hh
@@ -0,0 +1,76 @@
+#pragma once
+
+#include <vector>
+#include <map>
+
+namespace example {
+
+// TODO(syoyo): Support sparse accessor(sparse vertex attribute).
+// TODO(syoyo): Support more data type
+struct VertexAttrib {
+  std::string name;
+
+  // Value are converted to float type.
+  std::vector<float> data;
+
+  // Corresponding info in binary data
+  int data_type;       // e.g. TINYGLTF_TYPE_VEC2
+  int component_type;  // storage type. e.g.
+                       // TINYGLTF_COMPONENT_TYPE_UNSIGNED_INT
+  uint64_t buffer_offset{0};
+  size_t buffer_length{0};
+
+  // Optional.
+  std::vector<double> minValues;
+  std::vector<double> maxValues;
+
+  size_t numElements() const;
+
+};
+
+struct MeshPrim {
+  std::string name;
+  int32_t id{-1};
+
+  int mode; // e.g. TRIANGLES
+
+  VertexAttrib position;                  // vec3
+  VertexAttrib normal;                    // vec3
+  VertexAttrib tangent;                   // vec4
+  VertexAttrib color;                     // vec3 or vec4
+  std::map<int, VertexAttrib> texcoords;  // <slot, attrib>  vec2
+  std::map<int, VertexAttrib> weights;    // <slot, attrib>  vec4
+  std::map<int, VertexAttrib>
+      joints;  // <slot, attrib> store data as float type
+
+
+  // min/max of index value. -1 = undef
+  int indices_min{-1};
+  int indices_max{-1};
+  int indices_type{-1}; // storage type(componentType) of `indices`.
+  std::vector<uint32_t> indices; // vertex indices
+};
+
+///
+/// Save MeshPrim as wavefront .obj
+///
+bool SaveAsObjMesh(const std::string &filename, const MeshPrim &mesh);
+
+///
+/// Save MeshPrim as glTF mesh
+///
+bool SaveAsGLTFMesh(const std::string &filename, const MeshPrim &mesh);
+
+///
+/// Loads .obj and convert to MeshPrim
+///
+/// @param[in] facevarying Construct mesh with facevarying vertex layout(default false)
+///
+bool LoadObjMesh(const std::string &filename, bool facevarying, MeshPrim *mesh);
+
+///
+/// Print MeshPrim datra
+///
+void PrintMeshPrim(const MeshPrim &mesh);
+
+} // namespace example
--- a/examples/mesh-modify/meson.build
+++ b/examples/mesh-modify/meson.build
@@ -0,0 +1,7 @@
+project('mesh-modify', 'cpp', default_options : ['cpp_std=c++11'])
+
+thread_dep = dependency('threads')
+
+incdir = include_directories(['../../', '../common'])
+
+executable('mesh-modify', ['mesh-modify.cc', 'mesh-util.cc', 'tinygltf_impl.cc'], include_directories : incdir, dependencies : thread_dep)
--- a/examples/raytrace/obj-loader.cc
+++ b/examples/raytrace/obj-loader.cc
@@ -150,6 +150,7 @@ bool LoadObj(const std::string &filename, float scale,
  tinyobj::attrib_t attrib;
  std::vector<tinyobj::shape_t> shapes;
  std::vector<tinyobj::material_t> materials;
+  std::string warn;
  std::string err;

  std::string basedir = GetBaseDir(filename) + "/";
@@ -158,12 +159,16 @@ bool LoadObj(const std::string &filename, float scale,
  // auto t_start = std::chrono::system_clock::now();

  bool ret =
-      tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename.c_str(),
+      tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err, filename.c_str(),
                       basepath, /* triangulate */ true);

  // auto t_end = std::chrono::system_clock::now();
  // std::chrono::duration<double, std::milli> ms = t_end - t_start;

+  if (!warn.empty()) {
+    std::cout << warn << std::endl;
+  }
+
  if (!err.empty()) {
    std::cerr << err << std::endl;
  }
--- a/models/Extensions-overwrite-issue261/issue-261.bin
+++ b/models/Extensions-overwrite-issue261/issue-261.bin
--- a/models/Extensions-overwrite-issue261/issue-261.gltf
+++ b/models/Extensions-overwrite-issue261/issue-261.gltf
@@ -1,376 +0,0 @@
-{
-  "accessors": [
-    {
-      "bufferView": 0,
-      "componentType": 5126,
-      "count": 8,
-      "max": [
-        0.5,
-        0.5,
-        0.5
-      ],
-      "min": [
-        -0.5,
-        -0.5,
-        -0.5
-      ],
-      "type": "VEC3"
-    },
-    {
-      "bufferView": 1,
-      "componentType": 5125,
-      "count": 36,
-      "type": "SCALAR"
-    }
-  ],
-  "asset": {
-    "copyright": "NVIDIA Corporation",
-    "generator": "Iray glTF plugin",
-    "version": "2.0"
-  },
-  "bufferViews": [
-    {
-      "buffer": 0,
-      "byteLength": 96,
-      "byteStride": 12
-    },
-    {
-      "buffer": 0,
-      "byteLength": 144,
-      "byteOffset": 96
-    }
-  ],
-  "buffers": [
-    {
-      "byteLength": 240,
-      "uri": "issue-261.bin"
-    }
-  ],
-  "cameras": [
-    {
-      "extensions": {
-        "NV_Iray": {
-          "mip_burn_highlights": 0.699999988079071,
-          "mip_burn_highlights_per_component": false,
-          "mip_camera_shutter": 4.0,
-          "mip_cm2_factor": 1.0,
-          "mip_crush_blacks": 0.5,
-          "mip_f_number": 1.0,
-          "mip_film_iso": 100.0,
-          "mip_gamma": 2.200000047683716,
-          "mip_saturation": 1.0,
-          "mip_vignetting": 0.00019999999494757503,
-          "mip_whitepoint": [
-            1.0,
-            1.0,
-            1.0,
-            1.0
-          ],
-          "tm_enable_tonemapper": true,
-          "tm_tonemapper": "mia_exposure_photographic"
-        }
-      },
-      "extras": {
-        "resolution": [
-          640,
-          480
-        ]
-      },
-      "name": "default",
-      "perspective": {
-        "aspectRatio": 1.3333333730697632,
-        "yfov": 0.9272952079772949,
-        "zfar": 1000.0,
-        "znear": 0.1
-      },
-      "type": "perspective"
-    }
-  ],
-  "extensions": {
-    "KHR_lights_punctual": {
-      "lights": [
-        {
-          "color": [
-            1.0,
-            1.0,
-            1.0
-          ],
-          "intensity": 1000.0,
-          "name": "light",
-          "type": "point"
-        }
-      ]
-    },
-    "NV_MDL": {
-      "modules": [
-        "mdl::base",
-        "mdl::nvidia::core_definitions",
-        "mdl::state"
-      ],
-      "shaders": [
-        {
-          "definition": "mdl::base::environment_spherical(texture_2d)",
-          "name": "env_shd"
-        },
-        {
-          "arguments": {
-            "base_color": [
-              0.0055217444896698,
-              0.36859095096588135,
-              0.0041161770932376385
-            ],
-            "normal=": 2
-          },
-          "definition": "mdl::nvidia::core_definitions::flex_material",
-          "name": "cube_instance_material"
-        },
-        {
-          "definition": "mdl::state::normal()",
-          "name": "mdl::state::normal_341"
-        },
-        {
-          "arguments": {
-            "base_color": [
-              0.0055217444896698,
-              0.36859095096588135,
-              0.0041161770932376385
-            ],
-            "normal=": 4
-          },
-          "definition": "mdl::nvidia::core_definitions::flex_material",
-          "name": "cube_instance_material"
-        },
-        {
-          "definition": "mdl::state::normal()",
-          "name": "mdl::state::normal_341"
-        }
-      ]
-    }
-  },
-  "extensionsUsed": [
-    "NV_MDL",
-    "NV_Iray",
-    "KHR_lights_punctual"
-  ],
-  "materials": [
-    {
-      "doubleSided": true,
-      "extras": {
-        "mdl_shader": 1
-      },
-      "name": "cube_instance_material",
-      "pbrMetallicRoughness": {
-        "baseColorFactor": [
-          0.0055217444896698,
-          0.36859095096588135,
-          0.0041161770932376385,
-          1.0
-        ]
-      }
-    }
-  ],
-  "meshes": [
-    {
-      "name": "cube",
-      "primitives": [
-        {
-          "attributes": {
-            "POSITION": 0
-          },
-          "indices": 1,
-          "material": 0,
-          "mode": 4
-        }
-      ]
-    }
-  ],
-  "nodes": [
-    {
-      "camera": 0,
-      "extensions": {
-        "NV_Iray": {
-          "iview:fkey": -1,
-          "iview:fov": 53.130104064941406,
-          "iview:interest": [
-            0.1342654824256897,
-            -0.14356137812137604,
-            0.037264324724674225
-          ],
-          "iview:position": [
-            0.9729073643684387,
-            1.2592438459396362,
-            2.4199187755584717
-          ],
-          "iview:roll": 0.0,
-          "iview:up": [
-            0.0,
-            1.0,
-            0.0
-          ]
-        }
-      },
-      "matrix": [
-        0.9432751389105357,
-        -1.1769874756875739e-16,
-        -0.3320120665176343,
-        0.0,
-        -0.16119596696756341,
-        0.8742297945345237,
-        -0.45797175303889276,
-        0.0,
-        0.290254840694694,
-        0.48551237507207207,
-        0.8246392308792816,
-        0.0,
-        0.9729073377709113,
-        1.2592438262175363,
-        2.419918748461627,
-        1.0
-      ],
-      "name": "CamInst"
-    },
-    {
-      "extensions": {
-        "NV_Iray": {
-          "caustic": true,
-          "caustic_cast": true,
-          "caustic_recv": true,
-          "face_back": true,
-          "face_front": true,
-          "finalgather": true,
-          "finalgather_cast": true,
-          "finalgather_recv": true,
-          "globillum": true,
-          "globillum_cast": true,
-          "globillum_recv": true,
-          "material=": 3,
-          "pickable": true,
-          "reflection_cast": true,
-          "reflection_recv": true,
-          "refraction_cast": true,
-          "refraction_recv": true,
-          "shadow_cast": true,
-          "shadow_recv": true,
-          "transparency_cast": true,
-          "transparency_recv": true,
-          "visible": true
-        }
-      },
-      "mesh": 0,
-      "name": "cube_instance"
-    },
-    {
-      "extensions": {
-        "KHR_lights_punctual": {
-          "light": 0
-        },
-        "NV_Iray": {
-          "shadow_cast": true,
-          "visible": false
-        }
-      },
-      "matrix": [
-        0.6988062355563571,
-        -7.76042172309776e-17,
-        -0.7153110128800992,
-        -0.0,
-        -0.4276881690736487,
-        0.8015668284138362,
-        -0.41781987700564616,
-        -0.0,
-        0.57336957992379,
-        0.5979051928078428,
-        0.5601398979107212,
-        0.0,
-        2.3640632834071384,
-        2.465226204472449,
-        2.309515908392224,
-        1.0
-      ],
-      "name": "light_inst"
-    }
-  ],
-  "scene": 0,
-  "scenes": [
-    {
-      "extensions": {
-        "NV_Iray": {
-          "CP_canny_threshold1": 40,
-          "CP_canny_threshold2": 120,
-          "CP_color_quantization": 8,
-          "IVP_color": [
-            1.0,
-            0.0,
-            0.0,
-            1.0
-          ],
-          "TM_drago_bias": 0.8500000238418579,
-          "TM_drago_gamma2": 2.200000047683716,
-          "TM_drago_saturation": 1.0,
-          "TM_durand_contrast": 4.0,
-          "TM_durand_gamma": 2.200000047683716,
-          "TM_durand_saturation": 1.0,
-          "TM_durand_sigma_color": 2.0,
-          "TM_durand_sigma_space": 2.0,
-          "TM_linear_gamma": 2.200000047683716,
-          "TM_reinhard_color_adapt": 0.8999999761581421,
-          "TM_reinhard_gamma": 1.0,
-          "TM_reinhard_intensity": 0.0,
-          "TM_reinhard_light_adapt": 1.0,
-          "TM_reye_Ywhite": 1000000.0,
-          "TM_reye_bsize": 2,
-          "TM_reye_bthres": 3.0,
-          "TM_reye_gamma": 2.200000047683716,
-          "TM_reye_key": 0.5,
-          "TM_reye_saturation": 1.0,
-          "TM_reye_whitebalance": [
-            1.0,
-            0.9965101480484009,
-            0.9805564880371094,
-            0.0
-          ],
-          "environment_dome_depth": 200.0,
-          "environment_dome_height": 200.0,
-          "environment_dome_mode": "infinite",
-          "environment_dome_position": [
-            0.0,
-            0.0,
-            0.0
-          ],
-          "environment_dome_radius": 100.0,
-          "environment_dome_rotation_angle": 0.0,
-          "environment_dome_width": 200.0,
-          "environment_function=": 0,
-          "environment_function_intensity": 1.9900000095367432,
-          "iray_instancing": "off",
-          "iview::inline_color": [
-            1.0,
-            0.0,
-            0.0,
-            1.0
-          ],
-          "iview::inline_width": 1.0,
-          "iview::magnifier_size": 300,
-          "iview::offset": 10.0,
-          "iview::outline_color": [
-            0.0,
-            0.0,
-            0.0,
-            1.0
-          ],
-          "iview::outline_width": 2.0,
-          "iview::overview": true,
-          "iview::zoom_factor": 1.0,
-          "samples": 4.0,
-          "shadow_cast": true,
-          "shadow_recv": true
-        }
-      },
-      "nodes": [
-        0,
-        1,
-        2
-      ]
-    }
-  ]
-}
--- a/models/SparseMorphTargets-issue280/singleBlendshapeCube_sparse.glb
+++ b/models/SparseMorphTargets-issue280/singleBlendshapeCube_sparse.glb
--- a/tests/tester.cc
+++ b/tests/tester.cc
@@ -3,9 +3,6 @@
 #define STB_IMAGE_WRITE_IMPLEMENTATION
 #include "tiny_gltf.h"

-// Nlohmann json(include ../json.hpp)
-#include "json.hpp"
-
 #define CATCH_CONFIG_MAIN  // This tells Catch to provide a main() - only do this in one cpp file
 #include "catch.hpp"

@@ -96,59 +93,6 @@ TEST_CASE("extension-with-empty-object", "[issue-97]") {

 }

-TEST_CASE("extension-overwrite", "[issue-261]") {
-
-  tinygltf::Model model;
-  tinygltf::TinyGLTF ctx;
-  std::string err;
-  std::string warn;
-
-  bool ret = ctx.LoadASCIIFromFile(&model, &err, &warn, "../models/Extensions-overwrite-issue261/issue-261.gltf");
-  if (!err.empty()) {
-    std::cerr << err << std::endl;
-  }
-  REQUIRE(true == ret);
-
-  REQUIRE(model.extensionsUsed.size() == 3);
-  {
-    bool has_ext_lights = false;
-    has_ext_lights |= (model.extensionsUsed[0].compare("KHR_lights_punctual") == 0);
-    has_ext_lights |= (model.extensionsUsed[1].compare("KHR_lights_punctual") == 0);
-    has_ext_lights |= (model.extensionsUsed[2].compare("KHR_lights_punctual") == 0);
-
-    REQUIRE(true == has_ext_lights);
-  }
-
-  {
-    REQUIRE(model.extensions.size() == 2);
-    REQUIRE(model.extensions.count("NV_MDL"));
-    REQUIRE(model.extensions.count("KHR_lights_punctual"));
-  }
-
-  // TODO(syoyo): create temp directory.
-  {
-    ret = ctx.WriteGltfSceneToFile(&model, "issue-261.gltf", true, true);
-    REQUIRE(true == ret);
-
-    tinygltf::Model m;
-
-    // read back serialized glTF
-    bool ret = ctx.LoadASCIIFromFile(&m, &err, &warn, "issue-261.gltf");
-    if (!err.empty()) {
-      std::cerr << err << std::endl;
-    }
-    REQUIRE(true == ret);
-
-    REQUIRE(m.extensionsUsed.size() == 3);
-
-    REQUIRE(m.extensions.size() == 2);
-    REQUIRE(m.extensions.count("NV_MDL"));
-    REQUIRE(m.extensions.count("KHR_lights_punctual"));
-
-  }
-
-}
-
 TEST_CASE("invalid-primitive-indices", "[bounds-checking]") {
  tinygltf::Model model;
  tinygltf::TinyGLTF ctx;
@@ -415,41 +359,3 @@ TEST_CASE("image-uri-spaces", "[issue-236]") {
  REQUIRE(true == ret);
 }

-TEST_CASE("serialize-empty-material", "[issue-294]") {
-
-  tinygltf::Model m;
-
-  tinygltf::Material mat;
-  mat.pbrMetallicRoughness.baseColorFactor = {1.0f, 1.0f, 1.0f, 1.0f}; // default baseColorFactor
-  m.materials.push_back(mat);
-
-  std::stringstream os;
-
-  tinygltf::TinyGLTF ctx;
-  ctx.WriteGltfSceneToStream(&m, os, false, false);
-
-  // use nlohmann json
-  nlohmann::json j = nlohmann::json::parse(os.str());
-
-  REQUIRE(1 == j["materials"].size());
-  REQUIRE(j["asset"].is_null());
-  REQUIRE(j["materials"][0].is_object());
-
-}
-
-#ifndef TINYGLTF_NO_FS
-TEST_CASE("expandpath-utf-8", "[pr-226]") {
-
-  std::string s1 = "\xe5\xaf\xb9"; // utf-8 string
-
-  std::string ret = tinygltf::ExpandFilePath(s1, /* userdata */nullptr);
-
-  // expected: E5 AF B9
-  REQUIRE(3 == ret.size());
-
-  REQUIRE(0xe5 == static_cast<uint8_t>(ret[0]));
-  REQUIRE(0xaf == static_cast<uint8_t>(ret[1]));
-  REQUIRE(0xb9 == static_cast<uint8_t>(ret[2]));
-
-}
-#endif
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -26,9 +26,6 @@
 // THE SOFTWARE.

 // Version:
-//  - v2.5.0 Add SetPreserveImageChannels() option to load image data as is.
-//  - v2.4.3 Fix null object output when when material has all default
-//  parameters.
 //  - v2.4.2 Decode percent-encoded URI.
 //  - v2.4.1 Fix some glTF object class does not have `extensions` and/or
 //  `extras` property.
@@ -55,7 +52,6 @@

 #include <array>
 #include <cassert>
-#include <cmath>  // std::fabs
 #include <cstdint>
 #include <cstdlib>
 #include <cstring>
@@ -298,7 +294,7 @@ class Value {

  DEFAULT_METHODS(Value)

-  char Type() const { return static_cast<char>(type_); }
+  char Type() const { return static_cast<const char>(type_); }

  bool IsBool() const { return (type_ == BOOL_TYPE); }

@@ -326,8 +322,7 @@ class Value {
  }

  // Use this function if you want to have number value as int.
-  // TODO(syoyo): Support int value larger than 32 bits
-  int GetNumberAsInt() const {
+  double GetNumberAsInt() const {
    if (type_ == REAL_TYPE) {
      return int(real_value_);
    } else {
@@ -614,7 +609,7 @@ struct Sampler {
  int wrapT =
      TINYGLTF_TEXTURE_WRAP_REPEAT;  // ["CLAMP_TO_EDGE", "MIRRORED_REPEAT",
                                     // "REPEAT"], default "REPEAT"
-  //int wrapR = TINYGLTF_TEXTURE_WRAP_REPEAT;  // TinyGLTF extension. currently not used.
+  int wrapR = TINYGLTF_TEXTURE_WRAP_REPEAT;  // TinyGLTF extension

  Value extras;
  ExtensionMap extensions;
@@ -627,7 +622,8 @@ struct Sampler {
      : minFilter(-1),
        magFilter(-1),
        wrapS(TINYGLTF_TEXTURE_WRAP_REPEAT),
-        wrapT(TINYGLTF_TEXTURE_WRAP_REPEAT) {}
+        wrapT(TINYGLTF_TEXTURE_WRAP_REPEAT),
+        wrapR(TINYGLTF_TEXTURE_WRAP_REPEAT) {}
  DEFAULT_METHODS(Sampler)
  bool operator==(const Sampler &) const;
 };
@@ -666,8 +662,6 @@ struct Image {
    width = -1;
    height = -1;
    component = -1;
-    bits = -1;
-    pixel_type = -1;
  }
  DEFAULT_METHODS(Image)

@@ -850,10 +844,8 @@ struct Accessor {
  std::string extras_json_string;
  std::string extensions_json_string;

-  std::vector<double>
-      minValues;  // optional. integer value is promoted to double
-  std::vector<double>
-      maxValues;  // optional. integer value is promoted to double
+  std::vector<double> minValues;  // optional
+  std::vector<double> maxValues;  // optional

  struct {
    int count;
@@ -1002,7 +994,6 @@ struct Primitive {
  Primitive() {
    material = -1;
    indices = -1;
-    mode = -1;
  }
  DEFAULT_METHODS(Primitive)
  bool operator==(const Primitive &) const;
@@ -1122,9 +1113,9 @@ struct SpotLight {
 struct Light {
  std::string name;
  std::vector<double> color;
-  double intensity{1.0};
+  double intensity;
  std::string type;
-  double range{0.0};  // 0.0 = inifinite
+  double range;
  SpotLight spot;

  Light() : intensity(1.0), range(0.0) {}
@@ -1193,8 +1184,7 @@ enum SectionCheck {
 ///
 typedef bool (*LoadImageDataFunction)(Image *, const int, std::string *,
                                      std::string *, int, int,
-                                      const unsigned char *, int,
-                                      void *user_pointer);
+                                      const unsigned char *, int, void *);

 ///
 /// WriteImageDataFunction type. Signature for custom image writing callbacks.
@@ -1257,14 +1247,7 @@ struct FsCallbacks {

 bool FileExists(const std::string &abs_filename, void *);

-///
-/// Expand file path(e.g. `~` to home directory on posix, `%APPDATA%` to
-/// `C:\\Users\\tinygltf\\AppData`)
-///
-/// @param[in] filepath File path string. Assume UTF-8
-/// @param[in] userdata User data. Set to `nullptr` if you don't need it.
-///
-std::string ExpandFilePath(const std::string &filepath, void *userdata);
+std::string ExpandFilePath(const std::string &filepath, void *);

 bool ReadWholeFile(std::vector<unsigned char> *out, std::string *err,
                   const std::string &filepath, void *);
@@ -1350,11 +1333,6 @@ class TinyGLTF {
  ///
  void SetImageLoader(LoadImageDataFunction LoadImageData, void *user_data);

-  ///
-  /// Unset(remove) callback of loading image data
-  ///
-  void RemoveImageLoader();
-
  ///
  /// Set callback to use for writing image data
  ///
@@ -1393,16 +1371,6 @@ class TinyGLTF {
    return store_original_json_for_extras_and_extensions_;
  }

-  ///
-  /// Specify whether preserve image channales when loading images or not.
-  /// (Not effective when the user suppy their own LoadImageData callbacks)
-  ///
-  void SetPreserveImageChannels(bool onoff) {
-    preserve_image_channels_ = onoff;
-  }
-
-  bool GetPreserveImageChannels() const { return preserve_image_channels_; }
-
 private:
  ///
  /// Loads glTF asset from string(memory).
@@ -1422,9 +1390,6 @@ class TinyGLTF {

  bool store_original_json_for_extras_and_extensions_ = false;

-  bool preserve_image_channels_ = false;  /// Default false(expand channels to
-                                          /// RGBA) for backward compatibility.
-
  FsCallbacks fs = {
 #ifndef TINYGLTF_NO_FS
      &tinygltf::FileExists, &tinygltf::ExpandFilePath,
@@ -1444,8 +1409,7 @@ class TinyGLTF {
 #else
      nullptr;
 #endif
-  void *load_image_user_data_{nullptr};
-  bool user_image_loader_{false};
+  void *load_image_user_data_ = reinterpret_cast<void *>(&fs);

  WriteImageDataFunction WriteImageData =
 #ifndef TINYGLTF_NO_STB_IMAGE_WRITE
@@ -1453,7 +1417,7 @@ class TinyGLTF {
 #else
      nullptr;
 #endif
-  void *write_image_user_data_{nullptr};
+  void *write_image_user_data_ = reinterpret_cast<void *>(&fs);
 };

 #ifdef __clang__
@@ -1707,19 +1671,6 @@ void JsonParse(JsonDocument &doc, const char *str, size_t length,

 namespace tinygltf {

-///
-/// Internal LoadImageDataOption struct.
-/// This struct is passed through `user_pointer` in LoadImageData.
-/// The struct is not passed when the user supply their own LoadImageData
-/// callbacks.
-///
-struct LoadImageDataOption {
-  // true: preserve image channels(e.g. load as RGB image if the image has RGB
-  // channels) default `false`(channels are expanded to RGBA for backward
-  // compatiblity).
-  bool preserve_channels{false};
-};
-
 // Equals function for Value, for recursivity
 static bool Equals(const tinygltf::Value &one, const tinygltf::Value &other) {
  if (one.Type() != other.Type()) return false;
@@ -1932,9 +1883,8 @@ bool Sampler::operator==(const Sampler &other) const {
  return this->extensions == other.extensions && this->extras == other.extras &&
         this->magFilter == other.magFilter &&
         this->minFilter == other.minFilter && this->name == other.name &&
+         this->wrapR == other.wrapR && this->wrapS == other.wrapS &&
         this->wrapT == other.wrapT;
-
-         //this->wrapR == other.wrapR && this->wrapS == other.wrapS &&
 }
 bool Scene::operator==(const Scene &other) const {
  return this->extensions == other.extensions && this->extras == other.extras &&
@@ -2335,40 +2285,22 @@ static bool LoadExternalFile(std::vector<unsigned char> *out, std::string *err,
 void TinyGLTF::SetImageLoader(LoadImageDataFunction func, void *user_data) {
  LoadImageData = func;
  load_image_user_data_ = user_data;
-  user_image_loader_ = true;
-}
-
-void TinyGLTF::RemoveImageLoader() {
-  LoadImageData =
-#ifndef TINYGLTF_NO_STB_IMAGE
-      &tinygltf::LoadImageData;
-#else
-      nullptr;
-#endif
-
-  load_image_user_data_ = nullptr;
-  user_image_loader_ = false;
 }

 #ifndef TINYGLTF_NO_STB_IMAGE
 bool LoadImageData(Image *image, const int image_idx, std::string *err,
                   std::string *warn, int req_width, int req_height,
                   const unsigned char *bytes, int size, void *user_data) {
+  (void)user_data;
  (void)warn;

-  LoadImageDataOption option;
-  if (user_data) {
-    option = *reinterpret_cast<LoadImageDataOption *>(user_data);
-  }
-
  int w = 0, h = 0, comp = 0, req_comp = 0;

  unsigned char *data = nullptr;

-  // preserve_channels true: Use channels stored in the image file.
-  // false: force 32-bit textures for common Vulkan compatibility. It appears
-  // that some GPU drivers do not support 24-bit images for Vulkan
-  req_comp = option.preserve_channels ? 0 : 4;
+  // force 32-bit textures for common Vulkan compatibility. It appears that
+  // some GPU drivers do not support 24-bit images for Vulkan
+  req_comp = 4;
  int bits = 8;
  int pixel_type = TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE;

@@ -2440,18 +2372,13 @@ bool LoadImageData(Image *image, const int image_idx, std::string *err,
    }
  }

-  if (req_comp != 0) {
-    // loaded data has `req_comp` channels(components)
-    comp = req_comp;
-  }
-
  image->width = w;
  image->height = h;
-  image->component = comp;
+  image->component = req_comp;
  image->bits = bits;
  image->pixel_type = pixel_type;
-  image->image.resize(static_cast<size_t>(w * h * comp) * size_t(bits / 8));
-  std::copy(data, data + w * h * comp * (bits / 8), image->image.begin());
+  image->image.resize(static_cast<size_t>(w * h * req_comp) * size_t(bits / 8));
+  std::copy(data, data + w * h * req_comp * (bits / 8), image->image.begin());
  stbi_image_free(data);

  return true;
@@ -2554,15 +2481,6 @@ static inline std::wstring UTF8ToWchar(const std::string &str) {
                      (int)wstr.size());
  return wstr;
 }
-
-static inline std::string WcharToUTF8(const std::wstring &wstr) {
-  int str_size = WideCharToMultiByte(CP_UTF8, 0, wstr.data(), (int)wstr.size(),
-                                     nullptr, 0, NULL, NULL);
-  std::string str(str_size, 0);
-  WideCharToMultiByte(CP_UTF8, 0, wstr.data(), (int)wstr.size(), &str[0],
-                      (int)str.size(), NULL, NULL);
-  return str;
-}
 #endif

 #ifndef TINYGLTF_NO_FS
@@ -2614,16 +2532,15 @@ bool FileExists(const std::string &abs_filename, void *) {

 std::string ExpandFilePath(const std::string &filepath, void *) {
 #ifdef _WIN32
-  // Assume input `filepath` is encoded in UTF-8
-  std::wstring wfilepath = UTF8ToWchar(filepath);
-  DWORD wlen = ExpandEnvironmentStringsW(wfilepath.c_str(), nullptr, 0);
-  wchar_t *wstr = new wchar_t[wlen];
-  ExpandEnvironmentStringsW(wfilepath.c_str(), wstr, wlen);
+  DWORD len = ExpandEnvironmentStringsA(filepath.c_str(), NULL, 0);
+  char *str = new char[len];
+  ExpandEnvironmentStringsA(filepath.c_str(), str, len);

-  std::wstring ws(wstr);
-  delete[] wstr;
-  return WcharToUTF8(ws);
+  std::string s(str);

+  delete[] str;
+
+  return s;
 #else

 #if defined(TARGET_OS_IPHONE) || defined(TARGET_IPHONE_SIMULATOR) || \
@@ -2675,12 +2592,11 @@ bool ReadWholeFile(std::vector<unsigned char> *out, std::string *err,
      return false;
    }
    size_t size = AAsset_getLength(asset);
-    if (size == 0) {
+    if (size <= 0) {
      if (err) {
        (*err) += "Invalid file size : " + filepath +
                  " (does the path point to a directory?)";
      }
-      return false;
    }
    out->resize(size);
    AAsset_read(asset, reinterpret_cast<char *>(&out->at(0)), size);
@@ -2699,12 +2615,9 @@ bool ReadWholeFile(std::vector<unsigned char> *out, std::string *err,
      _wopen(UTF8ToWchar(filepath).c_str(), _O_RDONLY | _O_BINARY);
  __gnu_cxx::stdio_filebuf<char> wfile_buf(file_descriptor, std::ios_base::in);
  std::istream f(&wfile_buf);
-#elif defined(_MSC_VER) || defined(_LIBCPP_VERSION)
-  // For libcxx, assume _LIBCPP_HAS_OPEN_WITH_WCHAR is defined to accept
-  // `wchar_t *`
+#elif defined(_MSC_VER)
  std::ifstream f(UTF8ToWchar(filepath).c_str(), std::ifstream::binary);
-#else
-  // Unknown compiler/runtime
+#else  // clang?
  std::ifstream f(filepath.c_str(), std::ifstream::binary);
 #endif
 #else
@@ -2746,10 +2659,9 @@ bool WriteWholeFile(std::string *err, const std::string &filepath,
                    const std::vector<unsigned char> &contents, void *) {
 #ifdef _WIN32
 #if defined(__GLIBCXX__)  // mingw
-  int file_descriptor = _wopen(UTF8ToWchar(filepath).c_str(),
-                               _O_CREAT | _O_WRONLY | _O_TRUNC | _O_BINARY);
-  __gnu_cxx::stdio_filebuf<char> wfile_buf(
-      file_descriptor, std::ios_base::out | std::ios_base::binary);
+  int file_descriptor =
+      _wopen(UTF8ToWchar(filepath).c_str(), _O_WRONLY | _O_BINARY);
+  __gnu_cxx::stdio_filebuf<char> wfile_buf(file_descriptor, std::ios_base::in);
  std::ostream f(&wfile_buf);
 #elif defined(_MSC_VER)
  std::ofstream f(UTF8ToWchar(filepath).c_str(), std::ofstream::binary);
@@ -2800,13 +2712,12 @@ static void UpdateImageObject(Image &image, std::string &baseDir, int index,
                              void *user_data = nullptr) {
  std::string filename;
  std::string ext;
-  // If image has uri, use it it as a filename
+
+  // If image have uri. Use it it as a filename
  if (image.uri.size()) {
    filename = GetBaseFilename(image.uri);
    ext = GetFilePathExtension(filename);
-  } else if (image.bufferView != -1) {
-    // If there's no URI and the data exists in a buffer,
-    // don't change properties or write images
+
  } else if (image.name.size()) {
    ext = MimeToExt(image.mimeType);
    // Otherwise use name as filename
@@ -2818,7 +2729,7 @@ static void UpdateImageObject(Image &image, std::string &baseDir, int index,
  }

  // If callback is set, modify image data object
-  if (*WriteImageData != nullptr && !filename.empty()) {
+  if (*WriteImageData != nullptr) {
    std::string uri;
    (*WriteImageData)(&baseDir, &filename, &image, embedImages, user_data);
  }
@@ -3063,9 +2974,7 @@ json_const_iterator ObjectEnd(const json &o) {
 #endif
 }

-// Making this a const char* results in a pointer to a temporary when
-// TINYGLTF_USE_RAPIDJSON is off.
-std::string GetKey(json_const_iterator &it) {
+const char *GetKey(json_const_iterator &it) {
 #ifdef TINYGLTF_USE_RAPIDJSON
  return it->name.GetString();
 #else
@@ -4951,13 +4860,13 @@ static bool ParseAnimationChannel(
      }
      return false;
    }
-    ParseExtensionsProperty(&channel->target_extensions, err, target_object);
-    if (store_original_json_for_extras_and_extensions) {
+	ParseExtensionsProperty(&channel->target_extensions, err, target_object);
+	if (store_original_json_for_extras_and_extensions) {
      json_const_iterator it;
      if (FindMember(target_object, "extensions", it)) {
        channel->target_extensions_json_string = JsonToString(GetValue(it));
      }
-    }
+	}
  }

  channel->sampler = samplerIndex;
@@ -5089,12 +4998,12 @@ static bool ParseSampler(Sampler *sampler, std::string *err, const json &o,
  int magFilter = -1;
  int wrapS = TINYGLTF_TEXTURE_WRAP_REPEAT;
  int wrapT = TINYGLTF_TEXTURE_WRAP_REPEAT;
-  //int wrapR = TINYGLTF_TEXTURE_WRAP_REPEAT;
+  int wrapR = TINYGLTF_TEXTURE_WRAP_REPEAT;
  ParseIntegerProperty(&minFilter, err, o, "minFilter", false);
  ParseIntegerProperty(&magFilter, err, o, "magFilter", false);
  ParseIntegerProperty(&wrapS, err, o, "wrapS", false);
  ParseIntegerProperty(&wrapT, err, o, "wrapT", false);
-  //ParseIntegerProperty(&wrapR, err, o, "wrapR", false);  // tinygltf extension
+  ParseIntegerProperty(&wrapR, err, o, "wrapR", false);  // tinygltf extension

  // TODO(syoyo): Check the value is alloed one.
  // (e.g. we allow 9728(NEAREST), but don't allow 9727)
@@ -5103,7 +5012,7 @@ static bool ParseSampler(Sampler *sampler, std::string *err, const json &o,
  sampler->magFilter = magFilter;
  sampler->wrapS = wrapS;
  sampler->wrapT = wrapT;
-  //sampler->wrapR = wrapR;
+  sampler->wrapR = wrapR;

  ParseExtensionsProperty(&(sampler->extensions), err, o);
  ParseExtrasProperty(&(sampler->extras), o);
@@ -5768,15 +5677,10 @@ bool TinyGLTF::LoadFromString(Model *model, std::string *err, std::string *warn,
            .target = TINYGLTF_TARGET_ARRAY_BUFFER;
      }

-      for (auto &target : primitive.targets) {
-        for (auto &attribute : target) {
-          auto bufferView =
-              model->accessors[size_t(attribute.second)].bufferView;
-          // bufferView could be null(-1) for sparse morph target
-          if (bufferView >= 0) {
-            model->bufferViews[size_t(bufferView)].target =
-                TINYGLTF_TARGET_ARRAY_BUFFER;
-          }
+      for(auto &target : primitive.targets) {
+        for(auto &attribute : target) {
+          model->bufferViews[size_t(model->accessors[size_t(attribute.second)].bufferView)]
+              .target = TINYGLTF_TARGET_ARRAY_BUFFER;
        }
      }
    }
@@ -5886,18 +5790,6 @@ bool TinyGLTF::LoadFromString(Model *model, std::string *err, std::string *warn,
  }

  // 11. Parse Image
-  void *load_image_user_data{nullptr};
-
-  LoadImageDataOption load_image_option;
-
-  if (user_image_loader_) {
-    // Use user supplied pointer
-    load_image_user_data = load_image_user_data_;
-  } else {
-    load_image_option.preserve_channels = preserve_image_channels_;
-    load_image_user_data = reinterpret_cast<void *>(&load_image_option);
-  }
-
  {
    int idx = 0;
    bool success = ForEachInArray(v, "images", [&](const json &o) {
@@ -5910,7 +5802,7 @@ bool TinyGLTF::LoadFromString(Model *model, std::string *err, std::string *warn,
      Image image;
      if (!ParseImage(&image, idx, err, warn, o,
                      store_original_json_for_extras_and_extensions_, base_dir,
-                      &fs, &this->LoadImageData, load_image_user_data)) {
+                      &fs, &this->LoadImageData, load_image_user_data_)) {
        return false;
      }

@@ -5948,7 +5840,7 @@ bool TinyGLTF::LoadFromString(Model *model, std::string *err, std::string *warn,
        bool ret = LoadImageData(
            &image, idx, err, warn, image.width, image.height,
            &buffer.data[bufferView.byteOffset],
-            static_cast<int>(bufferView.byteLength), load_image_user_data);
+            static_cast<int>(bufferView.byteLength), load_image_user_data_);
        if (!ret) {
          return false;
        }
@@ -6373,13 +6265,6 @@ static void SerializeNumberProperty(const std::string &key, T number,
  JsonAddMember(obj, key.c_str(), json(number));
 }

-#ifdef TINYGLTF_USE_RAPIDJSON
-template <>
-void SerializeNumberProperty(const std::string &key, size_t number, json &obj) {
-  JsonAddMember(obj, key.c_str(), json(static_cast<uint64_t>(number)));
-}
-#endif
-
 template <typename T>
 static void SerializeNumberArrayProperty(const std::string &key,
                                         const std::vector<T> &value,
@@ -6530,10 +6415,9 @@ static bool SerializeGltfBufferData(const std::vector<unsigned char> &data,
                                    const std::string &binFilename) {
 #ifdef _WIN32
 #if defined(__GLIBCXX__)  // mingw
-  int file_descriptor = _wopen(UTF8ToWchar(binFilename).c_str(),
-                               _O_CREAT | _O_WRONLY | _O_TRUNC | _O_BINARY);
-  __gnu_cxx::stdio_filebuf<char> wfile_buf(
-      file_descriptor, std::ios_base::out | std::ios_base::binary);
+  int file_descriptor =
+      _wopen(UTF8ToWchar(binFilename).c_str(), _O_WRONLY | _O_BINARY);
+  __gnu_cxx::stdio_filebuf<char> wfile_buf(file_descriptor, std::ios_base::in);
  std::ostream output(&wfile_buf);
  if (!wfile_buf.is_open()) return false;
 #elif defined(_MSC_VER)
@@ -6616,41 +6500,15 @@ static void SerializeExtensionMap(const ExtensionMap &extensions, json &o) {
 }

 static void SerializeGltfAccessor(Accessor &accessor, json &o) {
-  if (accessor.bufferView >= 0)
-    SerializeNumberProperty<int>("bufferView", accessor.bufferView, o);
+  SerializeNumberProperty<int>("bufferView", accessor.bufferView, o);

-  if (accessor.byteOffset != 0)
+  if (accessor.byteOffset != 0.0)
    SerializeNumberProperty<int>("byteOffset", int(accessor.byteOffset), o);

  SerializeNumberProperty<int>("componentType", accessor.componentType, o);
  SerializeNumberProperty<size_t>("count", accessor.count, o);
-
-  if ((accessor.componentType == TINYGLTF_COMPONENT_TYPE_FLOAT) ||
-      (accessor.componentType == TINYGLTF_COMPONENT_TYPE_DOUBLE)) {
-    SerializeNumberArrayProperty<double>("min", accessor.minValues, o);
-    SerializeNumberArrayProperty<double>("max", accessor.maxValues, o);
-  } else {
-    // Issue #301. Serialize as integer.
-    // Assume int value is within [-2**31-1, 2**31-1]
-    {
-      std::vector<int> values;
-      std::transform(accessor.minValues.begin(), accessor.minValues.end(),
-                     std::back_inserter(values),
-                     [](double v) { return static_cast<int>(v); });
-
-      SerializeNumberArrayProperty<int>("min", values, o);
-    }
-
-    {
-      std::vector<int> values;
-      std::transform(accessor.maxValues.begin(), accessor.maxValues.end(),
-                     std::back_inserter(values),
-                     [](double v) { return static_cast<int>(v); });
-
-      SerializeNumberArrayProperty<int>("max", values, o);
-    }
-  }
-
+  SerializeNumberArrayProperty<double>("min", accessor.minValues, o);
+  SerializeNumberArrayProperty<double>("max", accessor.maxValues, o);
  if (accessor.normalized)
    SerializeValue("normalized", Value(accessor.normalized), o);
  std::string type;
@@ -6693,7 +6551,7 @@ static void SerializeGltfAnimationChannel(AnimationChannel &channel, json &o) {
    SerializeNumberProperty("node", channel.target_node, target);
    SerializeStringProperty("path", channel.target_path, target);

-    SerializeExtensionMap(channel.target_extensions, target);
+	SerializeExtensionMap(channel.target_extensions, target);

    JsonAddMember(o, "target", std::move(target));
  }
@@ -7100,9 +6958,7 @@ static void SerializeSpotLight(SpotLight &spot, json &o) {
 static void SerializeGltfLight(Light &light, json &o) {
  if (!light.name.empty()) SerializeStringProperty("name", light.name, o);
  SerializeNumberProperty("intensity", light.intensity, o);
-  if (light.range > 0.0) {
-    SerializeNumberProperty("range", light.range, o);
-  }
+  SerializeNumberProperty("range", light.range, o);
  SerializeNumberArrayProperty("color", light.color, o);
  SerializeStringProperty("type", light.type, o);
  if (light.type == "spot") {
@@ -7161,7 +7017,7 @@ static void SerializeGltfSampler(Sampler &sampler, json &o) {
  if (sampler.minFilter != -1) {
    SerializeNumberProperty("minFilter", sampler.minFilter, o);
  }
-  //SerializeNumberProperty("wrapR", sampler.wrapR, o);
+  SerializeNumberProperty("wrapR", sampler.wrapR, o);
  SerializeNumberProperty("wrapS", sampler.wrapS, o);
  SerializeNumberProperty("wrapT", sampler.wrapT, o);

@@ -7216,11 +7072,6 @@ static void SerializeGltfCamera(const Camera &camera, json &o) {
  } else {
    // ???
  }
-
-  if (camera.extras.Type() != NULL_TYPE) {
-    SerializeValue("extras", camera.extras, o);
-  }
-  SerializeExtensionMap(camera.extensions, o);
 }

 static void SerializeGltfScene(Scene &scene, json &o) {
@@ -7299,7 +7150,7 @@ static void SerializeGltfModel(Model *model, json &o) {
  JsonAddMember(o, "asset", std::move(asset));

  // BUFFERVIEWS
-  if (model->bufferViews.size()) {
+  if(model->bufferViews.size()) {
    json bufferViews;
    JsonReserveArray(bufferViews, model->bufferViews.size());
    for (unsigned int i = 0; i < model->bufferViews.size(); ++i) {
@@ -7310,6 +7161,11 @@ static void SerializeGltfModel(Model *model, json &o) {
    JsonAddMember(o, "bufferViews", std::move(bufferViews));
  }

+  // Extensions used
+  if (model->extensionsUsed.size()) {
+    SerializeStringArrayProperty("extensionsUsed", model->extensionsUsed, o);
+  }
+
  // Extensions required
  if (model->extensionsRequired.size()) {
    SerializeStringArrayProperty("extensionsRequired",
@@ -7323,16 +7179,6 @@ static void SerializeGltfModel(Model *model, json &o) {
    for (unsigned int i = 0; i < model->materials.size(); ++i) {
      json material;
      SerializeGltfMaterial(model->materials[i], material);
-
-      if (JsonIsNull(material)) {
-        // Issue 294.
-        // `material` does not have any required parameters
-        // so the result may be null(unmodified) when all material parameters
-        // have default value.
-        //
-        // null is not allowed thus we create an empty JSON object.
-        JsonSetObject(material);
-      }
      JsonPushBack(materials, std::move(material));
    }
    JsonAddMember(o, "materials", std::move(materials));
@@ -7430,9 +7276,7 @@ static void SerializeGltfModel(Model *model, json &o) {
  // EXTENSIONS
  SerializeExtensionMap(model->extensions, o);

-  auto extensionsUsed = model->extensionsUsed;
-
-  // LIGHTS as KHR_lights_punctual
+  // LIGHTS as KHR_lights_cmn
  if (model->lights.size()) {
    json lights;
    JsonReserveArray(lights, model->lights.size());
@@ -7447,7 +7291,7 @@ static void SerializeGltfModel(Model *model, json &o) {

    {
      json_const_iterator it;
-      if (FindMember(o, "extensions", it)) {
+      if (!FindMember(o, "extensions", it)) {
        JsonAssign(ext_j, GetValue(it));
      }
    }
@@ -7455,24 +7299,6 @@ static void SerializeGltfModel(Model *model, json &o) {
    JsonAddMember(ext_j, "KHR_lights_punctual", std::move(khr_lights_cmn));

    JsonAddMember(o, "extensions", std::move(ext_j));
-
-    // Also add "KHR_lights_punctual" to `extensionsUsed`
-    {
-      auto has_khr_lights_punctual =
-          std::find_if(extensionsUsed.begin(), extensionsUsed.end(),
-                       [](const std::string &s) {
-                         return (s.compare("KHR_lights_punctual") == 0);
-                       });
-
-      if (has_khr_lights_punctual == extensionsUsed.end()) {
-        extensionsUsed.push_back("KHR_lights_punctual");
-      }
-    }
-  }
-
-  // Extensions used
-  if (extensionsUsed.size()) {
-    SerializeStringArrayProperty("extensionsUsed", extensionsUsed, o);
  }

  // EXTRAS
@@ -7492,10 +7318,9 @@ static bool WriteGltfFile(const std::string &output,
 #if defined(_MSC_VER)
  std::ofstream gltfFile(UTF8ToWchar(output).c_str());
 #elif defined(__GLIBCXX__)
-  int file_descriptor = _wopen(UTF8ToWchar(output).c_str(),
-                               _O_CREAT | _O_WRONLY | _O_TRUNC | _O_BINARY);
-  __gnu_cxx::stdio_filebuf<char> wfile_buf(
-      file_descriptor, std::ios_base::out | std::ios_base::binary);
+  int file_descriptor =
+      _wopen(UTF8ToWchar(output).c_str(), _O_WRONLY | _O_BINARY);
+  __gnu_cxx::stdio_filebuf<char> wfile_buf(file_descriptor, std::ios_base::in);
  std::ostream gltfFile(&wfile_buf);
  if (!wfile_buf.is_open()) return false;
 #else
@@ -7581,10 +7406,9 @@ static void WriteBinaryGltfFile(const std::string &output,
 #if defined(_MSC_VER)
  std::ofstream gltfFile(UTF8ToWchar(output).c_str(), std::ios::binary);
 #elif defined(__GLIBCXX__)
-  int file_descriptor = _wopen(UTF8ToWchar(output).c_str(),
-                               _O_CREAT | _O_WRONLY | _O_TRUNC | _O_BINARY);
-  __gnu_cxx::stdio_filebuf<char> wfile_buf(
-      file_descriptor, std::ios_base::out | std::ios_base::binary);
+  int file_descriptor =
+      _wopen(UTF8ToWchar(output).c_str(), _O_WRONLY | _O_BINARY);
+  __gnu_cxx::stdio_filebuf<char> wfile_buf(file_descriptor, std::ios_base::in);
  std::ostream gltfFile(&wfile_buf);
 #else
  std::ofstream gltfFile(output.c_str(), std::ios::binary);
@@ -7605,13 +7429,13 @@ bool TinyGLTF::WriteGltfSceneToStream(Model *model, std::ostream &stream,

  // BUFFERS
  std::vector<unsigned char> binBuffer;
-  if (model->buffers.size()) {
+  if(model->buffers.size()) {
    json buffers;
    JsonReserveArray(buffers, model->buffers.size());
    for (unsigned int i = 0; i < model->buffers.size(); ++i) {
      json buffer;
-      if (writeBinary && i == 0 && model->buffers[i].uri.empty()) {
-        SerializeGltfBufferBin(model->buffers[i], buffer, binBuffer);
+      if (writeBinary && i==0 && model->buffers[i].uri.empty()){
+        SerializeGltfBufferBin(model->buffers[i], buffer,binBuffer);
      } else {
        SerializeGltfBuffer(model->buffers[i], buffer);
      }
@@ -7628,9 +7452,9 @@ bool TinyGLTF::WriteGltfSceneToStream(Model *model, std::ostream &stream,
      json image;

      std::string dummystring = "";
-      // UpdateImageObject need baseDir but only uses it if embeddedImages is
-      // enabled, since we won't write separate images when writing to a stream
-      // we
+      // UpdateImageObject need baseDir but only uses it if embededImages is
+      // enable, since we won't write separte images when writing to a stream we
+      // use a dummystring
      UpdateImageObject(model->images[i], dummystring, int(i), false,
                        &this->WriteImageData, this->write_image_user_data_);
      SerializeGltfImage(model->images[i], image);
@@ -7677,15 +7501,14 @@ bool TinyGLTF::WriteGltfSceneToFile(Model *model, const std::string &filename,
    JsonReserveArray(buffers, model->buffers.size());
    for (unsigned int i = 0; i < model->buffers.size(); ++i) {
      json buffer;
-      if (writeBinary && i == 0 && model->buffers[i].uri.empty()) {
-        SerializeGltfBufferBin(model->buffers[i], buffer, binBuffer);
+      if (writeBinary && i==0 && model->buffers[i].uri.empty()){
+        SerializeGltfBufferBin(model->buffers[i], buffer,binBuffer);
      } else if (embedBuffers) {
        SerializeGltfBuffer(model->buffers[i], buffer);
      } else {
        std::string binSavePath;
        std::string binUri;
-        if (!model->buffers[i].uri.empty() &&
-            !IsDataURI(model->buffers[i].uri)) {
+        if (!model->buffers[i].uri.empty() && !IsDataURI(model->buffers[i].uri)) {
          binUri = model->buffers[i].uri;
        } else {
          binUri = defaultBinFilename + defaultBinFileExt;
@@ -7711,7 +7534,7 @@ bool TinyGLTF::WriteGltfSceneToFile(Model *model, const std::string &filename,
      }
      JsonPushBack(buffers, std::move(buffer));
    }
-    JsonAddMember(output, "buffers", std::move(buffers));
+  JsonAddMember(output, "buffers", std::move(buffers));
  }

  // IMAGES
Author	SHA1	Message	Date
Syoyo Fujita	cb0a8794c3	Keep up with tinyobj's API update.	2020-03-11 19:30:57 +09:00
Syoyo Fujita	60e22f3281	Initial success to convert .obj to .glTF mesh.	2020-03-11 17:58:02 +09:00
Syoyo Fujita	4cfd2849fb	Implement .obj to glTF like mesh data converter	2020-03-10 22:19:14 +09:00
Syoyo Fujita	a5416707c9	update tinyobjloader. mesh-modify experiment.	2020-03-09 22:34:50 +09:00
Syoyo Fujita	8ec9af7f2e	Initial mesh-dump example.	2020-03-08 22:13:39 +09:00