multiple texture usage in hxsl

[davyzhang]

I write fragment func like this
function fragment(tex0:Texture, tex1:Texture, tex2:Texture, tex3:Texture)

but the problem is I don't the exact number of textures will used here

currently I uploaded 8 tex with some empty bitmapdata textures

but in agal I can dynamically make the agal opcode string to achieve this
for (var x:int;i < textureCount;i++){
"tex " + ftColor + "," + + "," + fsList[i] + "<2d,repeat,miplinear,linear>",
}

The thing I wanna achieve is similar like this:
http://blog.flash-core.com/?p=493

here's the google group thread
https://groups.google.com/forum/#!topic/haxelang/CF4ibEta5x4