1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'
// Character skin shader
// Includes falloff shadow
#define ENABLE_CAST_SHADOWS
// Material parameters
float4 _Color;
float4 _ShadowColor;
float4 _LightColor0;
float4 _MainTex_ST;
// Textures
sampler2D _MainTex;
sampler2D _FalloffSampler;
sampler2D _RimLightSampler;
// Constants
#define FALLOFF_POWER 1.0
#ifdef ENABLE_CAST_SHADOWS
// Structure from vertex shader to fragment shader
struct v2f
{
float4 pos : SV_POSITION;
LIGHTING_COORDS( 0, 1 )
float3 normal : TEXCOORD2;
float2 uv : TEXCOORD3;
float3 eyeDir : TEXCOORD4;
float3 lightDir : TEXCOORD5;
};
#else
// Structure from vertex shader to fragment shader
struct v2f
{
float4 pos : SV_POSITION;
float3 normal : TEXCOORD0;
float2 uv : TEXCOORD1;
float3 eyeDir : TEXCOORD2;
float3 lightDir : TEXCOORD3;
};
#endif
// Float types
#define float_t half
#define float2_t half2
#define float3_t half3
#define float4_t half4
// Vertex shader
v2f vert( appdata_base v )
{
v2f o;
o.pos = UnityObjectToClipPos( v.vertex );
o.uv = TRANSFORM_TEX( v.texcoord.xy, _MainTex );
o.normal = normalize( mul( unity_ObjectToWorld, float4_t( v.normal, 0 ) ).xyz );
// Eye direction vector
float4_t worldPos = mul( unity_ObjectToWorld, v.vertex );
o.eyeDir = normalize( _WorldSpaceCameraPos - worldPos );
o.lightDir = WorldSpaceLightDir( v.vertex );
#ifdef ENABLE_CAST_SHADOWS
TRANSFER_VERTEX_TO_FRAGMENT( o );
#endif
return o;
}
// Fragment shader
float4 frag( v2f i ) : COLOR
{
float4_t diffSamplerColor = tex2D( _MainTex, i.uv );
// Falloff. Convert the angle between the normal and the camera direction into a lookup for the gradient
float_t normalDotEye = dot( i.normal, i.eyeDir );
float_t falloffU = clamp( 1 - abs( normalDotEye ), 0.02, 0.98 );
float4_t falloffSamplerColor = FALLOFF_POWER * tex2D( _FalloffSampler, float2( falloffU, 0.25f ) );
float3_t combinedColor = lerp( diffSamplerColor.rgb, falloffSamplerColor.rgb * diffSamplerColor.rgb, falloffSamplerColor.a );
// Rimlight
float_t rimlightDot = saturate( 0.5 * ( dot( i.normal, i.lightDir ) + 1.0 ) );
falloffU = saturate( rimlightDot * falloffU );
//falloffU = saturate( ( rimlightDot * falloffU - 0.5 ) * 32.0 );
falloffU = tex2D( _RimLightSampler, float2( falloffU, 0.25f ) ).r;
float3_t lightColor = diffSamplerColor.rgb * 0.5; // * 2.0;
combinedColor += falloffU * lightColor;
#ifdef ENABLE_CAST_SHADOWS
// Cast shadows
float3_t shadowColor = _ShadowColor.rgb * combinedColor;
float_t attenuation = saturate( 2.0 * LIGHT_ATTENUATION( i ) - 1.0 );
combinedColor = lerp( shadowColor, combinedColor, attenuation );
#endif
return float4_t( combinedColor, diffSamplerColor.a ) * _Color * _LightColor0;
}
|
