private static string GetLUTInput(PICALUTInput Input, PICALUTScale Scale, int LUT)
{
//TODO: CosLightSpot and CosPhi
string InputStr;
switch (Input)
{
default:
case PICALUTInput.CosNormalHalf: InputStr = "CosNormalHalf"; break;
case PICALUTInput.CosViewHalf: InputStr = "CosViewHalf"; break;
case PICALUTInput.CosNormalView: InputStr = "CosNormalView"; break;
case PICALUTInput.CosLightNormal: InputStr = "CosLightNormal"; break;
case PICALUTInput.CosLightSpot: InputStr = "CosLightSpot"; break;
case PICALUTInput.CosPhi: InputStr = "CosPhi"; break;
}
string Output = $"texture(LUTs[{LUT}], vec2(({InputStr} + 1) * 0.5, 0)).r";
if (Scale != PICALUTScale.One)
{
string ScaleStr = Scale.ToSingle().ToString(CultureInfo.InvariantCulture);
Output = $"min({Output} * {ScaleStr}, 1)";
}
return(Output);
}
public PICALUTInScale(uint Param)
{
Dist0 = (PICALUTScale)((Param >> 0) & 7);
Dist1 = (PICALUTScale)((Param >> 4) & 7);
Specular = (PICALUTScale)((Param >> 8) & 7);
Fresnel = (PICALUTScale)((Param >> 12) & 7);
ReflecR = (PICALUTScale)((Param >> 16) & 7);
ReflecG = (PICALUTScale)((Param >> 20) & 7);
ReflecB = (PICALUTScale)((Param >> 24) & 7);
}
public static float ToSingle(this PICALUTScale Scale)
{
switch (Scale)
{
case PICALUTScale.One: return(1);
case PICALUTScale.Two: return(2);
case PICALUTScale.Four: return(4);
case PICALUTScale.Eight: return(8);
case PICALUTScale.Quarter: return(0.25f);
case PICALUTScale.Half: return(0.5f);
default: throw new ArgumentException("Invalid Scale value!");
}
}
