106 lines
2.8 KiB
Plaintext
106 lines
2.8 KiB
Plaintext
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// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
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// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'
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// Character skin shader
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// Includes falloff shadow
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#define ENABLE_CAST_SHADOWS
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// Material parameters
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float4 _Color;
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float4 _ShadowColor;
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float4 _LightColor0;
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float4 _MainTex_ST;
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// Textures
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sampler2D _MainTex;
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sampler2D _FalloffSampler;
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sampler2D _RimLightSampler;
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// Constants
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#define FALLOFF_POWER 1.0
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#ifdef ENABLE_CAST_SHADOWS
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// Structure from vertex shader to fragment shader
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struct v2f
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{
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float4 pos : SV_POSITION;
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LIGHTING_COORDS( 0, 1 )
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float3 normal : TEXCOORD2;
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float2 uv : TEXCOORD3;
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float3 eyeDir : TEXCOORD4;
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float3 lightDir : TEXCOORD5;
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};
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#else
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// Structure from vertex shader to fragment shader
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struct v2f
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{
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float4 pos : SV_POSITION;
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float3 normal : TEXCOORD0;
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float2 uv : TEXCOORD1;
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float3 eyeDir : TEXCOORD2;
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float3 lightDir : TEXCOORD3;
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};
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#endif
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// Float types
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#define float_t half
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#define float2_t half2
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#define float3_t half3
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#define float4_t half4
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// Vertex shader
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v2f vert( appdata_base v )
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{
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v2f o;
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o.pos = UnityObjectToClipPos( v.vertex );
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o.uv = TRANSFORM_TEX( v.texcoord.xy, _MainTex );
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o.normal = normalize( mul( unity_ObjectToWorld, float4_t( v.normal, 0 ) ).xyz );
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// Eye direction vector
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float4_t worldPos = mul( unity_ObjectToWorld, v.vertex );
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o.eyeDir = normalize( _WorldSpaceCameraPos - worldPos );
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o.lightDir = WorldSpaceLightDir( v.vertex );
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#ifdef ENABLE_CAST_SHADOWS
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TRANSFER_VERTEX_TO_FRAGMENT( o );
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#endif
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return o;
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}
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// Fragment shader
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float4 frag( v2f i ) : COLOR
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{
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float4_t diffSamplerColor = tex2D( _MainTex, i.uv );
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// Falloff. Convert the angle between the normal and the camera direction into a lookup for the gradient
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float_t normalDotEye = dot( i.normal, i.eyeDir );
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float_t falloffU = clamp( 1 - abs( normalDotEye ), 0.02, 0.98 );
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float4_t falloffSamplerColor = FALLOFF_POWER * tex2D( _FalloffSampler, float2( falloffU, 0.25f ) );
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float3_t combinedColor = lerp( diffSamplerColor.rgb, falloffSamplerColor.rgb * diffSamplerColor.rgb, falloffSamplerColor.a );
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// Rimlight
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float_t rimlightDot = saturate( 0.5 * ( dot( i.normal, i.lightDir ) + 1.0 ) );
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falloffU = saturate( rimlightDot * falloffU );
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//falloffU = saturate( ( rimlightDot * falloffU - 0.5 ) * 32.0 );
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falloffU = tex2D( _RimLightSampler, float2( falloffU, 0.25f ) ).r;
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float3_t lightColor = diffSamplerColor.rgb * 0.5; // * 2.0;
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combinedColor += falloffU * lightColor;
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#ifdef ENABLE_CAST_SHADOWS
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// Cast shadows
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float3_t shadowColor = _ShadowColor.rgb * combinedColor;
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float_t attenuation = saturate( 2.0 * LIGHT_ATTENUATION( i ) - 1.0 );
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combinedColor = lerp( shadowColor, combinedColor, attenuation );
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#endif
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return float4_t( combinedColor, diffSamplerColor.a ) * _Color * _LightColor0;
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}
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