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@andykorth

andykorth/SFSoftShadow.shader Secret

Created Sep 30, 2016
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Shader "Sprites/SFSoftShadow" {
Properties {
_MainTex ("Base (RGB)", 2D) = "white" {}
_Tint ("Tint and Transparency", Color) = (1.0, 1.0, 1.0, 1.0)
_SoftHardMix ("Unshadowed/Shadowed Mix", Range(0.0, 1.0)) = 0.0
_AmbientOnlyMix ("Lit/Ambient Mix", Range(0.0, 1.0)) = 0.0
_Glow ("Self Illumination", Color) = (0.0, 0.0, 0.0, 0.0)
[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
}
SubShader {
Tags {
"Queue" = "Transparent"
"IgnoreProjector" = "True"
"RenderType" = "Transparent"
"PreviewType" = "Plane"
"CanUseSpriteAtlas" = "True"
}
Pass {
Blend One OneMinusSrcAlpha
Cull Off
Lighting Off
ZWrite Off
Fog {
Mode Off
}
CGPROGRAM
#define DISABLE_PROJ_TEXTURE_READS 0
#include "UnityCG.cginc"
#pragma vertex VShader
#pragma fragment FShader
#pragma multi_compile _ PIXELSNAP_ON
#pragma multi_compile _ FIXEDSAMPLEPOINT_ON LINESAMPLE_ON
float4x4 _SFProjection;
sampler2D _MainTex;
float4 _MainTex_ST;
float4 _SFAmbientLight;
sampler2D _SFLightMap;
sampler2D _SFLightMapWithShadows;
float _SFExposure;
float2 _SamplePosition;
float _SoftHardMix;
float _AmbientOnlyMix;
float4 _Glow;
float4 _Tint;
struct VertexInput {
float3 position : POSITION;
float2 texCoord : TEXCOORD0;
float4 color : COLOR;
};
struct VertexOutput {
float4 position : SV_POSITION;
float2 texCoord : TEXCOORD0;
#if DISABLE_PROJ_TEXTURE_READS
float2 uv : TEXCOORD1;
#else
float4 lightCoord : TEXCOORD1;
#endif
float4 color : COLOR;
};
VertexOutput VShader(VertexInput v){
float4 position = mul(UNITY_MATRIX_MVP, float4(v.position, 1.0));
float3 samplePosition = v.position;
#if defined(LINESAMPLE_ON)
samplePosition = float3(v.position.x, _SamplePosition.y, v.position.z);
#endif
#if defined(FIXEDSAMPLEPOINT_ON)
samplePosition = float3(_SamplePosition.xy, v.position.z);
#endif
// Unity does some magic crap to the projection matrix for DirectX
// Can't trust it because you can't detect when it applies workarounds to it.
float4 shadowCoord = mul(mul(_SFProjection, UNITY_MATRIX_MV), float4(samplePosition, 1.0));
#if defined(PIXELSNAP_ON)
position = UnityPixelSnap(position);
shadowCoord = UnityPixelSnap(shadowCoord);
#endif
VertexOutput o = {
position,
TRANSFORM_TEX(v.texCoord, _MainTex),
#if DISABLE_PROJ_TEXTURE_READS
// uv:
(0.5*(shadowCoord + shadowCoord.w)).xy,
#else
// lightCoords adjusted for perspective effects
0.5*(shadowCoord + shadowCoord.w),
#endif
v.color * _Tint,
};
return o;
}
fixed4 FShader(VertexOutput v) : SV_Target {
fixed4 color = v.color*tex2D(_MainTex, v.texCoord);
#if DISABLE_PROJ_TEXTURE_READS
// Cheaper version:
fixed3 l0 = tex2D(_SFLightMap, v.uv).rgb;
fixed3 l1 = tex2D(_SFLightMapWithShadows, v.uv).rgb;
#else
// lightCoords adjusted for perspective effects
fixed3 l0 = tex2Dproj(_SFLightMap, UNITY_PROJ_COORD(v.lightCoord)).rgb;
fixed3 l1 = tex2Dproj(_SFLightMapWithShadows, UNITY_PROJ_COORD(v.lightCoord)).rgb;
#endif
fixed3 light = lerp(l0, l1, _SoftHardMix);
// "light" already has ambient applied, _SFAmbientLight is only the ambient color.
color.rgb *= (lerp(light, _SFAmbientLight, _AmbientOnlyMix) + _Glow) *_SFExposure*color.a;
return color;
}
ENDCG
}
}
}
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