Month: March 2011

 
//util functions (this section is the one I would like to see grow)
 
//same as 'mix'
public static function lerp(target:String, source1:String, source2:String, ratio:String):String
{
	var code:String = "";
	code += sub(target, source2, source1);
	code += mul(target, target, ratio);
	code += add(target, target, source1);
	return code;
}
 
//should return the length of the source vector
public static function length(target:String, source:String):String
{
	var code:String = "";
	code += dp3(target, source, source);
	code += sqt(target, target);
	return code;
}
//calculates the reflection vector based on a view direction and a normal (formula:  r = V - 2(V.N)*N)
public static function reflect(target:String, view:String, normal:String):String
{
	var code:String = "";
	code += dp3(target+".w", view+".xyz", normal+".xyz");
	code += add(target+".w", target+".w", target+".w");
	code += mul(target+".xyz", normal+".xyz", target+".w");
	code += sub(target+".xyz", view+".xyz", target+".xyz");
	code += neg(target+".xyz", target+".xyz");
	return code;
}
 
//generic helpers (usefulness debatable)
 
//unit vector from Light to the Vertex position
public static function light(target:String, light:String, position:String):String
{
	var code:String = "";
	code += sub(target, position, light);
	code += nrm(target, target);
	return code;
}
//unit vector from Vertex P to the View position V
public static function view(target:String, position:String, camera:String):String
{
	var code:String = "";
	code += sub(target, camera, position);
	code += nrm(target, target);
	return code;
}
//unit vector halfway H, between L and V, used for Blinn simplification
public static function half(target:String, light:String, view:String):String
{
	var code:String = "";
	code += add(target, light, view);
	code += nrm(target, target);
	return code;
}
 
//wrappers for inbuilt functions (incomplete)
public static function mov(target:String, source:String):String
{
	return "mov " + target + " " + source + "\n";
}
public static function add(target:String, source1:String, source2:String):String
{
	return "add " + target + " " + source1 + " " + source2 + "\n";
}
public static function sub(target:String, source1:String, source2:String):String
{
	return "sub " + target + " " + source1 + " " + source2 + "\n";
}
public static function mul(target:String, source1:String, source2:String):String
{
	return "mul " + target + " " + source1 + " " + source2 + "\n";
}
public static function neg(target:String, source:String):String
{
	return "neg " + target + " " + source + "\n";
}
public static function sqt(target:String, source:String):String
{
	return "sqt " + target + " " + source + "\n";
}
public static function nrm(target:String, source:String):String
{
	return "nrm " + target + " " + source + "\n";
}
public static function dp3(target:String, source1:String, source2:String):String
{
	return "dp3 " + target + " " + source1 + " " + source2 + "\n";
}
public static function pow(target:String, source1:String, source2:String):String
{
	return "pow " + target + " " + source1 + " " + source2 + "\n";
}
public static function m33(target:String, source1:String, source2:String):String
{
	return "m33 " + target + " " + source1 + " " + source2 + "\n";
}
public static function tex(target:String, coord:String, texture:String, type:String, wrap:String, filter:String):String
{
	return "tex "+target+" "+coord+" "+texture+" <"+type+","+wrap+","+filter+">" + "\n";
}