From cad515fbc3a8bff0a92b87ff55ca0f7342563827 Mon Sep 17 00:00:00 2001
From: Syoyo Fujita <syoyo@lighttransport.com>
Date: Thu, 22 Sep 2022 04:36:58 +0900
Subject: [PATCH] Add WASI build procedure.

---
 README.md      |  6 ++++++
 wasm/Makefile  | 11 +++++++++++
 wasm/README.md | 31 +++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+)
 create mode 100644 wasm/Makefile
 create mode 100644 wasm/README.md

diff --git a/README.md b/README.md
index 143212e..d36cc1c 100644
--- a/README.md
+++ b/README.md
@@ -86,6 +86,12 @@ In extension(`ExtensionMap`), JSON number value is parsed as int or float(number
 * [basic](examples/basic) : Basic glTF viewer with texturing support.
 * [build-gltf](examples/build-gltf) : Build simple glTF scene from a scratch.
 
+### WASI/WASM build
+
+Users who want to run TinyGLTF securely and safely(e.g. need to handle malcious glTF file to serve online glTF conver),
+I recommend to build TinyGLTF for WASM target.
+WASI build example is located in [wasm](wasm) .
+
 ## Projects using TinyGLTF
 
 * px_render Single header C++ Libraries for Thread Scheduling, Rendering, and so on... https://github.com/pplux/px
diff --git a/wasm/Makefile b/wasm/Makefile
new file mode 100644
index 0000000..133f54b
--- /dev/null
+++ b/wasm/Makefile
@@ -0,0 +1,11 @@
+WASI_VERSION=16
+WASI_VERSION_FULL=${WASI_VERSION}.0
+
+WASI_SDK_PATH=$(HOME)/local/wasi-sdk-${WASI_VERSION_FULL}
+
+CC=${WASI_SDK_PATH}/bin/clang
+CXX=${WASI_SDK_PATH}/bin/clang++
+CXXFLAGS=-fno-rtti -fno-exceptions -g -Os
+
+all:
+	$(CXX) ../loader_example.cc $(CXXFLAGS) -I../
diff --git a/wasm/README.md b/wasm/README.md
new file mode 100644
index 0000000..d1d50e2
--- /dev/null
+++ b/wasm/README.md
@@ -0,0 +1,31 @@
+Experimental WASI/WASM build
+
+## Build
+
+Download wasi-sdk https://github.com/WebAssembly/wasi-sdk
+
+Compile tinygltf with C++ exceptions and threads off. See `Makefile` for details
+(NOTE: TinyGLTF itself does not use RTTI and threading feature(C++ threads, posix, win32 thread))
+
+## Build examples and Run
+
+Build `loader_example.cc`
+
+```
+$ /path/to/wasi-sdk-16.0/bin/clang++ ../loader_example.cc -fno-rtti -fno-exceptions -g -Os -I../ -o loader_example.wasi
+```
+
+Tested with wasmtime.  https://github.com/bytecodealliance/wasmtime
+
+
+Set a folder containing .gltf file to `--dir`
+
+```
+$ wasmtime --dir=../models loader_example.wasi ../models/Cube/Cube.gltf
+```
+
+## Emscripen
+
+T.B.W. ...
+
+EoL.