This repository provides an example of how to use C++, OpenGL and Emscripten to create a simple zoomable image viewer for the web using WebAssembly.
You can view this example in a desktop browser that supports WebAssembly here: https://svoisen.github.io/wasm-imageviewer/
To build this project you will need the Emscripten compiler (emcc) installed and accessible in your $PATH. You will also need the GNU make tool. If you haven't already installed Emscripten, follow the instructions on the Emscripten website.
Once you have everything installed, simply run make in the project directory, then open index.html.
Due to cross-origin security issues, some browsers may require that you serve the contents of the project from a webserver. This is because the Emscripten runtime uses an XHR request to load the WebAssembly code. One simple option, if you have Python installed, is to use Python's SimpleHTTPServer:
python -m SimpleHTTPServer
Then open http://localhost:8000 to view the example.