Sample of how to call JS from Emscripten

test.cpp

#include <emscripten/bind.h>


using namespace emscripten;

// note - assuming you're including your own javascript

auto window = val::global("window");

// come up with a function to create a video element. 
emscripten::val videoElement = window.call<void>("MyVideoElementCreationFunction");
videoElement.set("src","url to video");

// make a texture
GLuint tex = glCreateTexture();

// texture should be populated in JS under the GL.textures array, set an ID on the element