Shader "Hidden/Post FX/Lut Generator"
|
{
|
CGINCLUDE
|
|
#pragma target 3.0
|
#pragma multi_compile __ TONEMAPPING_NEUTRAL TONEMAPPING_FILMIC
|
|
#include "UnityCG.cginc"
|
#include "ACES.cginc"
|
#include "Common.cginc"
|
#include "ColorGrading.cginc"
|
#include "Tonemapping.cginc"
|
|
half3 _Balance;
|
|
half3 _Lift;
|
half3 _InvGamma;
|
half3 _Gain;
|
|
half3 _Offset;
|
half3 _Power;
|
half3 _Slope;
|
|
half _HueShift;
|
half _Saturation;
|
half _Contrast;
|
|
half3 _ChannelMixerRed;
|
half3 _ChannelMixerGreen;
|
half3 _ChannelMixerBlue;
|
|
half4 _NeutralTonemapperParams1;
|
half4 _NeutralTonemapperParams2;
|
|
sampler2D _Curves;
|
|
half4 _LutParams;
|
|
half3 ColorGrade(half3 color)
|
{
|
half3 aces = unity_to_ACES(color);
|
|
// ACEScc (log) space
|
half3 acescc = ACES_to_ACEScc(aces);
|
|
acescc = OffsetPowerSlope(acescc, _Offset, _Power, _Slope);
|
|
half2 hs = RgbToHsv(acescc).xy;
|
half satMultiplier = SecondaryHueSat(hs.x, _Curves);
|
satMultiplier *= SecondarySatSat(hs.y, _Curves);
|
satMultiplier *= SecondaryLumSat(AcesLuminance(acescc), _Curves);
|
|
acescc = Saturation(acescc, _Saturation * satMultiplier);
|
acescc = ContrastLog(acescc, _Contrast);
|
|
aces = ACEScc_to_ACES(acescc);
|
|
// ACEScg (linear) space
|
half3 acescg = ACES_to_ACEScg(aces);
|
|
acescg = WhiteBalance(acescg, _Balance);
|
acescg = LiftGammaGain(acescg, _Lift, _InvGamma, _Gain);
|
|
half3 hsv = RgbToHsv(acescg);
|
hsv.x = SecondaryHueHue(hsv.x + _HueShift, _Curves);
|
acescg = HsvToRgb(hsv);
|
|
acescg = ChannelMixer(acescg, _ChannelMixerRed, _ChannelMixerGreen, _ChannelMixerBlue);
|
|
#if TONEMAPPING_FILMIC
|
|
aces = ACEScg_to_ACES(acescg);
|
color = FilmicTonemap(aces);
|
|
#elif TONEMAPPING_NEUTRAL
|
|
color = ACEScg_to_unity(acescg);
|
color = NeutralTonemap(color, _NeutralTonemapperParams1, _NeutralTonemapperParams2);
|
|
#else
|
|
color = ACEScg_to_unity(acescg);
|
|
#endif
|
|
// YRGB curves (done in linear/LDR for now)
|
color = YrgbCurve(color, _Curves);
|
|
return color;
|
}
|
|
half4 FragCreateLut(VaryingsDefault i) : SV_Target
|
{
|
// 2D strip lut
|
half2 uv = i.uv - _LutParams.yz;
|
half3 color;
|
color.r = frac(uv.x * _LutParams.x);
|
color.b = uv.x - color.r / _LutParams.x;
|
color.g = uv.y;
|
|
// Lut is in LogC
|
half3 colorLogC = color * _LutParams.w;
|
|
// Switch back to unity linear and color grade
|
half3 colorLinear = LogCToLinear(colorLogC);
|
half3 graded = ColorGrade(colorLinear);
|
|
return half4(graded, 1.0);
|
}
|
|
ENDCG
|
|
SubShader
|
{
|
Cull Off ZWrite Off ZTest Always
|
|
// (0)
|
Pass
|
{
|
CGPROGRAM
|
|
#pragma vertex VertDefault
|
#pragma fragment FragCreateLut
|
|
ENDCG
|
}
|
}
|
}
|
