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How to find the texture slot label for a shader

When writing tools for dealing with real-time shaders it is often necessary to find out the label name for the samplers displayed in the DX or CG shader property pages. They often have labels like Decal_Map or Normal_Map but have parameter names such as Texture_0 and Texture_1. There is a script for finding those labels:

// how to find texture_slot label for a shader
var matlibs = Application.ActiveProject.ActiveScene.MaterialLibraries;

var eMatLibs = new Enumerator(matlibs);

for( ; ! eMatLibs.atEnd(); eMatLibs.moveNext())
{
	var matlib = eMatLibs.item();
	var eMats = new Enumerator(matlib.items);
   
	for( ; ! eMats.atEnd(); eMats.moveNext())
	{
		var material = eMats.item();
		
		var shaders = material .GetAllShaders();
		
		// find the texture slots
		var eShaders  = new Enumerator (shaders );
		
		for ( ; ! eShaders  .atEnd(); eShaders  .moveNext() )
		{
			var shader = eShaders  .item();			
			var eParams = new Enumerator (shader.parameters);
			
			var ppglayout = shader.PPGLayout;

			for ( ; ! eParams.atEnd(); eParams.moveNext() )
			{
				var param = eParams .item();
      
				if ( shader.GetShaderInputType(param.name) == siTextureParameterType )
				{
					var ppgitem = ppglayout.Item(param.Name);
	
					logmessage( "texture slot: " + param + ":" + ppgitem.Label);
				}	
			}
		}
	}      		
}