DesaturatedDarks2

Original Author: Aras Pranckevicius

Updated for V2: Joe Schultz

Description

Desaturated Darks shader

This shader desaturates unlit areas (whereas in traditional shaders unlit areas are black, with this one they are only grayscale). This is a pixel lit shader.

This shader requires a fragment program card to work (GeForce FX and up, Radeon 9500 and up, Intel 9xx and up). On older cards it will fallback to Diffuse.

ShaderLab - DesaturatedDarks.shader

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Shader "Desaturated Darks" {
Properties {
    _Color ("Main Color", Color) = (1,1,1,1)
    _MainTex ("Base (RGB)", 2D) = "white" {}
    _Darkening ("Darkening", Range (0,1)) = 0.5
}
Category {
    Blend AppSrcAdd AppDstAdd
    Fog { Color [_AddFog] }
    
    SubShader {
        
        // Ambient pass
        Pass {
            Name "BASE"
            Tags {"LightMode" = "PixelOrNone"}
CGPROGRAM
#pragma fragment frag
#pragma fragmentoption ARB_fog_exp2
#pragma fragmentoption ARB_precision_hint_fastest
 
#include "UnityCG.cginc"
 
uniform sampler2D _MainTex;
uniform float _Darkening;
uniform float4 _Color;
 
half4 frag( v2f_vertex_lit i ) : COLOR
{
    // texture
    half4 texcol = tex2D( _MainTex, i.uv ) * _Color;
    half unlit = Luminance( texcol.xyz ) * (1.0 - _Darkening);
    texcol.xyz = unlit;
    return texcol;
}
ENDCG
            SetTexture [_MainTex] {}
        }
        
        // Vertex lit pass
        Pass {
            Name "BASE"
            Tags {"LightMode" = "Vertex"}
            Material {
                Diffuse [_Color]
                Ambient (0,0,0,0)
            }
            Lighting On
 
CGPROGRAM
#pragma fragment frag
#pragma fragmentoption ARB_fog_exp2
#pragma fragmentoption ARB_precision_hint_fastest
 
#include "UnityCG.cginc"
 
uniform sampler2D _MainTex;
uniform float _Darkening;
uniform float4 _Color;
 
half4 frag( v2f_vertex_lit i ) : COLOR
{
    // texture
    half4 texcol = tex2D( _MainTex, i.uv );
 
    // intensity of the lighting
    half brightness = saturate(Luminance( i.diff.xyz ) * 2);
    
    // color of completely unlit & desaturated areas
    half unlit = Luminance(
        lerp( texcol.xyz, texcol.xyz * i.diff.xyz, _Darkening ) );
    
    // final color based on lighting intensity
    half4 c;
    c.xyz = lerp( half3(unlit), texcol.xyz * i.diff.xyz * 2.0, brightness );
    
    c.w = texcol.w * i.diff.w;
    return c;
}
ENDCG
 
            SetTexture [_MainTex] {}
        }
        
        // Pixel lit pass
        Pass {
            Name "PPL"
            Tags { "LightMode" = "Pixel" }
            // This lighting is not additive, instead it must
            // blend over existing grayscale into saturated.
            // So we output light's intensity into alpha
            // and blend.
            Blend SrcAlpha OneMinusSrcAlpha
            ColorMask RGB
            
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_builtin
#pragma fragmentoption ARB_fog_exp2
#pragma fragmentoption ARB_precision_hint_fastest
#include "UnityCG.cginc"
#include "AutoLight.cginc"

uniform float4 _MainTex_ST; // for _MainTex
uniform sampler2D _MainTex;
uniform float _Darkening;
uniform float4 _Color;

 
struct v2f {
    V2F_POS_FOG;
    LIGHTING_COORDS
    float3  uv;
    float3  normal;
    float3  lightDir;
}; 

v2f vert (appdata_base v)
{
    v2f o;
    PositionFog( v.vertex, o.pos, o.fog );
    o.normal = v.normal;
	TRANSFORM_TEX(v.vertex, _MainTex);
    o.lightDir = ObjSpaceLightDir( v.vertex );    
	TRANSFER_VERTEX_TO_FRAGMENT(o);
    return o;
}
 
float4 frag (v2f i) : COLOR
{
    // texture
    half4 texcol = tex2D( _MainTex, i.uv );
    
    // intensity of the lighting
    half brightness = Luminance( DiffuseLight( i.lightDir, i.normal, _ModelLightColor0, LIGHT_ATTENUATION(i) ).rgb );
    
    half4 c;
    c.rgb = texcol.rgb * _ModelLightColor0.rgb;
    c.a = brightness;
    return c;
}
ENDCG
        }
    }
}
 
Fallback " Diffuse", 1
}