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nanogui GLES wasm

what is it this is fork of nanogui modified for WASM and GLES (nanovg and nanogui source files modified)

live demo link

Building

$ cd ext
$ git clone https://github.com/libigl/eigen.git
$ cd ..
$ em++ -DNANOVG_GLES3_IMPLEMENTATION -DGLFW_INCLUDE_ES3 -DGLFW_INCLUDE_GLEXT -DNANOGUI_LINUX -Iext/nanovg/ ext/nanovg.c --std=c++11 -O3 -lGL -lGLU -lm -lGLEW -s USE_GLFW=3 -s FULL_ES3=1 -s USE_WEBGL2=1 -o nanovg.bc
$ em++ -DNANOVG_GLES3_IMPLEMENTATION -DGLFW_INCLUDE_ES3 -DGLFW_INCLUDE_GLEXT -DNANOGUI_LINUX -Iinclude/ -Iext/nanovg/ -Iext/eigen/ button.cpp checkbox.cpp colorpicker.cpp colorwheel.cpp combobox.cpp common.cpp glcanvas.cpp glutil.cpp graph.cpp imagepanel.cpp imageview.cpp label.cpp layout.cpp messagedialog.cpp popup.cpp popupbutton.cpp progressbar.cpp screen.cpp serializer.cpp slider.cpp stackedwidget.cpp tabheader.cpp tabwidget.cpp textbox.cpp theme.cpp vscrollpanel.cpp widget.cpp window.cpp nanogui_resources.cpp nanovg.bc --std=c++11 -O3 -lGL -lGLU -lm -lGLEW -s USE_GLFW=3 -s FULL_ES3=1 -s USE_WEBGL2=1 -s WASM=1 -o nanogui.bc
$ mkdir build
$ em++ -DNANOVG_GLES3_IMPLEMENTATION -DGLFW_INCLUDE_ES3 -DGLFW_INCLUDE_GLEXT -DNANOGUI_LINUX -Iinclude/ -Iext/nanovg/ -Iext/eigen/ nanogui.bc example1.cpp --std=c++11 -O3 -lGL -lGLU -lm -lGLEW -s USE_GLFW=3 -s FULL_ES3=1 -s USE_WEBGL2=1 -s WASM=1 -o build/nanogui.html --preload-file ./icons

Problems

• WARNING I found problem with lambda in WASM, I think it work same way like in Java, in Java "local variables referenced from a lambda expression must be final or effectively final", I mean using any setCallback method you need make all variables Global (include object that call setCallback) or you can not call "callback" from other classes/functions (outside of creation function)
• std::thread (pthread) support in wasm disabled check this
• asserts in wasm does not fit C asserts
• glGetError() has too much errors, better skip checking
• exceptions to build with -s DISABLE_EXCEPTION_CATCHING=0

pthread nanogui can be builded in wasm with pthreads -s USE_PTHREADS=2 -s PTHREAD_POOL_SIZE=10 need to remove while(true) loop from threads (common.cpp line 79) building with pthread give you (much)less FPS and 100% processor usage, to launch it you need use old browser like firefox 57