gistfile1.txt

//Propertices related of Tone map.
[Header(TONE MAPPER)]//// Neutral tonemapping (Hable/Hejl/Frostbite)
[Toggle] _toggleToneMapper("Tone Mapper" , FLOAT) = 0
_a("Segment A" , Range(0.1, 1)) = 0.2
_b("Segment B" , Range(0.1, 1)) = 0.29
_c("Segment C" , Range(0.1, 1)) = 0.24
_d("Segment D" , Range(0.1, 1)) = 0.272
_e("Segment E" , Range(0.01, 0.1)) = 0.02
_f("Segment F" , Range(0.1, 1)) = 0.3
_WhiteLevel("ToneMappe White Level" , Range(1.3, 5.3)) = 2.3

//====================================================================

//adding to variable for On off toggle 
uniform half _toggleToneMapper;

//=====================================================================
// Neutral tonemapping (Hable/Hejl/Frostbite)
// Adding to Neutral tone map function inside shader.
FLOAT3 NeutralCurve(FLOAT3 x, FLOAT a, FLOAT b, FLOAT c, FLOAT d, FLOAT e, FLOAT f)
         {
             return ((x * (a * x + c * b) + d * e) / (x * (a * x + b) + d * f)) - e / f;
         }

         FLOAT3 NeutralTonemap(FLOAT3 x)
         {
// Tonemap
const FLOAT a = _a;
             const FLOAT b = _b;
             const FLOAT c = _c;
             const FLOAT d = _d;
             const FLOAT e = _e;
             const FLOAT f = _f;
             const FLOAT whiteLevel = _WhiteLevel;
             const FLOAT whiteClip = 1;

             half3 whiteScale = (1.0).xxx / NeutralCurve(whiteLevel, a, b, c, d, e, f);
             x = NeutralCurve(x * whiteScale, a, b, c, d, e, f);
             x *= whiteScale;

// Post-curve white point adjustment
x /= whiteClip.xxx;

             return x;
         }
         
//=======================================================================================
// Use to if branch with NeutralTonemap function for last output result of finalColor.
if (_toggleToneMapper)
{
   finalColor = NeutralTonemap(finalColor);
}