Move to glslify

[vorg]

Now with glslify-promise nothing is stopping us from incorporating glslify and shader modularity into pex.

Before there was problem that glslify would return a stream to be transformed by browserify into static string but now with glslify-promise on the node side (in Plask) it can return a Promise that Program can handle in both environments (Plask & Browser).

var program = new Program(
    glslify(__dirname + '/PBR.vert'),
    glslify(__dirname + '/PBR.frag')
  );