public float?GetFloatLiteral()
{
if (Type.IsScalarType() && Type != ShaderType.Bool)
{
if (!Single.TryParse(RefText, out var res))
{
return(null);
}
return(res);
}
return(null);
}
private static void EnsureSizeIfNotScalar(SSLVisitor vis, IToken token, string name, ShaderType vtype, ShaderType ctype, int vp, int cp)
{
if (!ctype.IsScalarType() && (ctype.GetComponentCount() != vtype.GetComponentCount()))
{
vis.Error(token, $"The built-in function '{name}' requires argument {cp} to be a scalar, or a matching vector size to argument {vp}.");
}
}
// 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);
}