void Main()
{

	float4 color = Sample();

	float Gamma = 1.2;
	float IntensityContrast = 1.3;
	float Saturation = 1.7;
	float ToneMappingCurve = 2.0;
	float ToneMappingOversaturation = 40.0;

	float Brightness = 0.16;
	float BrightnessCurve = 1.28;
	float BrightnessMultiplier = 0.85;
	float BrightnessToneMappingCurve = 0.42;

	float HPDTonemappingExposure = 2.2;
	float HPDTonemappingClipping = 0.0004;
	float HPDTonemappingUpperTone = 6.2;
	float HPDTonemappingGreyTone = 0.5;
	float HPDTonemappingMiddleTone = 1.7;
	float HPDTonemappingLowerTone = 0.06;

	color.r = pow(color.r, Gamma);
	color.g = pow(color.g, Gamma);
	color.b = pow(color.b, Gamma);

	color.rgb *= Brightness;
	color.rgb += 0.000001;
	float3 xncol = normalize(color.rgb);
	float3 scl = color.rgb/xncol.rgb;

	scl.r = pow(scl.r, IntensityContrast);
	scl.g = pow(scl.g, IntensityContrast);
	scl.b = pow(scl.b, IntensityContrast);

	xncol.r = pow(xncol.r, Saturation);
	xncol.g = pow(xncol.g, Saturation);
	xncol.b = pow(xncol.b, Saturation);

	color.rgb = scl*xncol.rgb;

	float	lumamax = ToneMappingOversaturation;
	color.rgb = (color.rgb * (1.0 + color.rgb/lumamax))/(color.rgb + ToneMappingCurve);

  float Y = dot(color.rgb, float3(0.299, 0.587, 0.114)); //0.299 * R + 0.587 * G + 0.114 * B;
	float U = dot(color.rgb, float3(-0.14713, -0.28886, 0.436)); //-0.14713 * R - 0.28886 * G + 0.436 * B;
	float V = dot(color.rgb, float3(0.615, -0.51499, -0.10001)); //0.615 * R - 0.51499 * G - 0.10001 * B;

	Y = pow(Y, BrightnessCurve);
	Y = Y*BrightnessMultiplier;
	Y = Y/(Y+BrightnessToneMappingCurve);
	float	desaturatefact = clamp(Y*Y*Y*1.7, 0.0, 1.0);
	U = mix(U, 0.0, desaturatefact);
	V = mix(V, 0.0, desaturatefact);
	color.rgb = V * float3(1.13983, -0.58060, 0.0) + U * float3(0.0, -0.39465, 2.03211) + Y;

	float3 xColor = color.xyz;
	xColor = max(xColor, HPDTonemappingClipping);
	xColor = abs((xColor * (HPDTonemappingUpperTone * xColor + HPDTonemappingGreyTone )) / (xColor * (HPDTonemappingUpperTone * xColor + HPDTonemappingMiddleTone) + HPDTonemappingLowerTone ));

	color.r = pow(xColor.r, HPDTonemappingExposure);
	color.g = pow(xColor.g, HPDTonemappingExposure);
	color.b = pow(xColor.b, HPDTonemappingExposure);

	SetOutput(color);

}