public static bool IsSwizzleValid(ShaderType type, char swizzle)
{
var sidx = (swizzle == 'x' || swizzle == 'r' || swizzle == 's') ? 1 :
(swizzle == 'y' || swizzle == 'g' || swizzle == 't') ? 2 :
(swizzle == 'z' || swizzle == 'b' || swizzle == 'p') ? 3 :
(swizzle == 'w' || swizzle == 'a' || swizzle == 'q') ? 4 :
0;
if (sidx == 0)
{
return(false);
}
return(type.IsVectorType() && (sidx <= type.GetComponentCount()));
}
// stype = the type of swizzle - 0 = position, 1 = color, 2 = texcoord
public static string GetSwizzle(ShaderType type, int stype)
{
if (type.IsScalarType() || type.IsVectorType())
{
var cc = type.GetComponentCount();
if (cc == 1)
{
return((stype == 0) ? "x" : (stype == 1) ? "r" : "s");
}
if (cc == 2)
{
return((stype == 0) ? "xy" : (stype == 1) ? "rg" : "st");
}
if (cc == 3)
{
return((stype == 0) ? "xyz" : (stype == 1) ? "rgb" : "stp");
}
if (cc == 4)
{
return((stype == 0) ? "xyzw" : (stype == 1) ? "rgba" : "stpq");
}
}
return(null);
}
