This is a class which extends openfl.display.Tilesheet and adds stage3D support to the drawTiles method, if available.

Ported to Haxe 3/OpenFL by AS3Boyan

Original repository: https://code.google.com/p/tilesheet-stage3d/

Currently it's not very fast at rendering lots of sprites, but at least, it's much better than default Flash fallback(In tilelayer). Also it has much lower CPU consumption.

//Init Stage3D
#if flash11
    TilesheetStage3D.init(stage, 0, 5, init, Context3DRenderMode.AUTO);
#else
    init();
#end
	
function init(?result:String):Void
{
//init
addEventListener(Event.ENTER_FRAME, onEnterFrame);
}
	
//Add this before calling drawTiles to onEnterFrame handler
#if flash11
TilesheetStage3D.clearGraphic(graphics);
#end

You can use TilesheetStage3D under the terms of the MIT license.

OpenFL Stage3D drawTiles thread: http://www.openfl.org/developer/forums/general-discussion/stage3d-based-drawtiles-implementation-alpha/