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Shader "Tutorial/40_DitheredLighting" {
//show values to edit in inspector
Properties{
_Color("Tint", Color) = (0, 0, 0, 1)
_MainTex("Texture", 2D) = "white" {}
[HDR] _Emission("Emission", color) = (0,0,0)
_HalftonePattern("Halftone Pattern", 2D) = "white" {}
_RemapInputMin ("Remap input min value", Range(0, 1)) = 0
_RemapInputMax ("Remap input max value", Range(0, 1)) = 1
_RemapOutputMin ("Remap output min value", Range(0, 1)) = 0
_RemapOutputMax ("Remap output max value", Range(0, 1)) = 1
}
SubShader{
//the material is completely non-transparent and is rendered at the same time as the other opaque geometry
Tags{ "RenderType" = "Opaque" "Queue" = "Geometry"}
CGPROGRAM
//the shader is a surface shader, meaning that it will be extended by unity in the background to have fancy lighting and other features
//our surface shader function is called surf and we use our custom lighting model
//fullforwardshadows makes sure unity adds the shadow passes the shader might need
#pragma surface surf Halftone fullforwardshadows
#pragma target 3.0
//basic properties
sampler2D _MainTex;
fixed4 _Color;
half3 _Emission;
//shading properties
sampler2D _HalftonePattern;
float4 _HalftonePattern_ST;
///remapping values
float _RemapInputMin;
float _RemapInputMax;
float _RemapOutputMin;
float _RemapOutputMax;
//struct that holds information that gets transferred from surface to lighting function
struct HalftoneSurfaceOutput {
fixed3 Albedo;
float2 ScreenPos;
half3 Emission;
fixed Alpha;
fixed3 Normal;
};
// This function remaps values from a input to a output range
float map(float input, float inMin, float inMax, float outMin, float outMax)
{
//inverse lerp with input range
float relativeValue = (input - inMin) / (inMax - inMin);
//lerp with output range
return lerp(outMin, outMax, relativeValue);
}
//our lighting function. Will be called once per light
float4 LightingHalftone(HalftoneSurfaceOutput s, float3 lightDir, float atten) {
//how much does the normal point towards the light?
float towardsLight = dot(s.Normal, lightDir);
//remap the value from -1 to 1 to between 0 and 1
towardsLight = towardsLight * 0.5 + 0.5;
//combine shadow and light and clamp the result between 0 and 1
float lightIntensity = saturate(towardsLight * atten).r;
//get halftone comparison value
float halftoneValue = tex2D(_HalftonePattern, s.ScreenPos).r;
//make lightness binary between fully lit and fully shadow based on halftone pattern (with a bit of antialiasing between)
halftoneValue = map(halftoneValue, _RemapInputMin, _RemapInputMax, _RemapOutputMin, _RemapOutputMax);
float halftoneChange = fwidth(halftoneValue) * 0.5;
lightIntensity = smoothstep(halftoneValue - halftoneChange, halftoneValue + halftoneChange, lightIntensity);
//combine the color
float4 col;
//intensity we calculated previously, diffuse color, light falloff and shadowcasting, color of the light
col.rgb = lightIntensity * s.Albedo * _LightColor0.rgb;
//in case we want to make the shader transparent in the future - irrelevant right now
col.a = s.Alpha;
return col;
}
//input struct which is automatically filled by unity
struct Input {
float2 uv_MainTex;
float4 screenPos;
};
//the surface shader function which sets parameters the lighting function then uses
void surf(Input i, inout HalftoneSurfaceOutput o) {
//set surface colors
fixed4 col = tex2D(_MainTex, i.uv_MainTex);
col *= _Color;
o.Albedo = col.rgb;
o.Emission = _Emission;
//setup screenspace UVs for lighing function
float aspect = _ScreenParams.x / _ScreenParams.y;
o.ScreenPos = i.screenPos.xy / i.screenPos.w;
o.ScreenPos = TRANSFORM_TEX(o.ScreenPos, _HalftonePattern);
o.ScreenPos.x = o.ScreenPos.x * aspect;
}
ENDCG
}
FallBack "Standard"
}
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