shader 学习记录
学习shader笔记 记录~ unity版本 2017.4.1
shader具体内容：
basecolor , second tex blend , snow blend , invert color , detail map , uv aniamtion , ramp map ,envCap , flow map , shader 自定义开关
比较基础，所以不写注释了～
源码:
Shader "Custom/wbshader (Support lightmap, Fog)" {
Properties {
_MainTex ("Base (RGB)", 2D) = "white" {}
_SecondTex("Second Tex",2D) = "white" {}
_TintColor ("Tint Color", Color) = (0.5,0.5,0.5,1)
[Space(10)]
[Toggle] _SNOWBLEND ("Snow blend", Float) = 0
[Space(10)]
[ShowWhenHasKeyword(_SNOWBLEND_ON)]_Color ("Match Color ", Color) = (0.22, 0.707, 0.071, 0)
[ShowWhenHasKeyword(_SNOWBLEND_ON)]_WeightVector ("Weight (r: 方向 g: 顶点色A b: 颜色图)", Vector) = (0.15, 0.5, 0.33,1)
[ShowWhenHasKeyword(_SNOWBLEND_ON)]_SmoothEdge ("Smooth", Range (0.01, 1)) = 0.1
[ShowWhenHasKeyword(_SNOWBLEND_ON)]_SnowThreshold ("Threshold", Range (0.01, 1)) = 0.1
[ShowWhenHasKeyword(_SNOWBLEND_ON)]_ThresholdOffset ("Threshold Offset", Range (0, 1)) = 0.1
[Space(10)]
[Enum(UnityEngine.Rendering.BlendMode)] _SrcBlend ("Src Blend Mode", Float) = 1
[Enum(UnityEngine.Rendering.BlendMode)] _DstBlend ("Dst Blend Mode", Float) = 1
[Enum(Off, 0, On, 1)] _ZWrite ("ZWrite", Float) = 0
[Enum(UnityEngine.Rendering.CompareFunction)] _ZTest ("ZTest", Float) = 0
[Enum(UnityEngine.Rendering.CullMode)] _Cull ("Cull Mode", Float) = 1
[KeywordEnum(None, Add, Multiply)] _Overlay ("Overlay mode", Float) = 0
[PowerSlider(3.0)] _Shininess ("Shininess", Range (0.01, 1)) = 0.08
[Space(5)]
[Toggle] _Invert ("Invert color?", Float) = 0
[Space(5)]
[Toggle] _DETAIL ("Detail Map", Float) = 0
[Space(5)]
[ShowWhenHasKeyword(_DETAIL_ON)] _DetailTex ("Detail Map (RGB)", 2D) = "grey" {}
[ShowWhenHasKeyword(_DETAIL_ON)] _DetailRepeat("Detail Repeat", float) = 10
[ShowWhenHasKeyword(_DETAIL_ON)] _DetailAmount("Detail Amount", float) = 0.3
[ShowWhenHasKeyword(_DETAIL_ON)] _DetailColor("Detail Color", Color) = (0.5,0.5,0.5,1)
[Space(5)]
[Toggle] _UVANIMATION ("UV Animation", Float) = 0
[Space(5)]
[ShowWhenHasKeyword(_UVANIMATION_ON)] _Speed("UV动画速度",Float) = 1
[ShowWhenHasKeyword(_UVANIMATION_ON)] _UVScale("UV缩放",Float)= 1
[Space(5)]
[Toggle] _CHARACTER ("Character Setting", Float) = 0
//[Space(10)]
// [ShowWhenHasKeyword(_CHARACTER_ON)] _EnvCap ("EnvCap (RGB)", 2D) = "white" {}
// [ShowWhenHasKeyword(_CHARACTER_ON)] _RmapMap ("RampMap (RGB)", 2D) = "white" {}
// [ShowWhenHasKeyword(_CHARACTER_ON)] _FlowLight ("Flow Light (RGB)", 2D) = "white" {}
[ShowWhenHasKeyword(_CHARACTER_ON)]_EnvMap ("EnvCap (RGB)", 2D) = "white" {}
[ShowWhenHasKeyword(_CHARACTER_ON)]_RampMap ("RampMap (RGB)", 2D) = "white" {}
[ShowWhenHasKeyword(_CHARACTER_ON)]_FlowLightMap ("Flow Light (RGB)", 2D) = "white" {}
[ShowWhenHasKeyword(_CHARACTER_ON)]_MaskMap ("Mask Map",2D ) = "white" {}
[ShowWhenHasKeyword(_CHARACTER_ON)]_FlowColor ("流光颜色, (A控制叠加方式)", Color) = (1,0.6,0.2,1)
[ShowWhenHasKeyword(_CHARACTER_ON)]_FlowMultiplier ("流光强度", float) = 4
[ShowWhenHasKeyword(_CHARACTER_ON)]_FlowThreshold ("FlowThreshold", float) = .75
}
SubShader {
Blend [_SrcBlend] [_DstBlend]
ZWrite [_ZWrite]
ZTest [_ZTest]
Cull [_Cull]
pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma shader_feature _INVERT_ON
#pragma shader_feature _DETAIL_ON
#pragma shader_feature _CHARACTER_ON
#pragma shader_feature _UVANIMATION_ON
#pragma multi_compile _OVERLAY_NONE _OVERLAY_ADD _OVERLAY_MULTIPLY
#include "UnityCG.cginc"
sampler2D _MainTex;
sampler2D _SecondTex;
half4 _TintColor;
float4 _MainTex_ST;
float4 _SecondTex_ST;
#if _SNOWBLEND_ON
float4 _Color;
float4 _WeightVector;
float _SmoothEdge;
float _SnowThreshold;
float _ThresholdOffset;
#endif
float _Shininess;
#if _DETAIL_ON
sampler2D _DetailTex;
float _DetailRepeat;
float _DetailAmount;
float4 _DetailColor;
#endif
#if _CHARACTER_ON
sampler2D _EnvMap;
sampler2D _RampMap;
sampler2D _FlowLightMap;
sampler2D _MaskMap;
float4 _FlowColor;
float4 _FlowLightMap_ST;
half _Scroll2X;
half _Scroll2Y;
float _FlowMultiplier;
float _FlowThreshold;
#endif
#if _UVANIMATION_ON
float _Speed;
float _UVScale;
#endif
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
float3 normal : NORMAL;
fixed4 color : COLOR;
float4 texcoord : TEXCOORD1;
};
struct v2f
{
float4 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
half4 capCoord : TEXCOORD2;
half4 faceUV : TEXCOORD3;
float3 normal :TEXCOORD1;
half4 lightDirAndLM : TEXCOORD4;
half3 mask :TEXCOORD5;
};
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv.xy = TRANSFORM_TEX(v.uv, _MainTex);
o.uv.zw = TRANSFORM_TEX(v.uv, _SecondTex);
#if _UVANIMATION_ON
float2 uv = float2(v.uv.x * _UVScale + _Time.y * _Speed,v.uv.y);//增加UV动画和UVscale
o.uv.xy = TRANSFORM_TEX(uv, _MainTex).xy;
#endif
half3 normalInView = mul((float3x3)UNITY_MATRIX_IT_MV, v.normal);
o.capCoord.xy = half2((normalize(normalInView).xy * 0.25) + 0.25) + half2( 0.5, 0) * (1- v.color.r); //R: lowerLf
o.capCoord.zw = o.capCoord + half2(0, 0.5);
#if _CHARACTER_ON
o.faceUV.xy = TRANSFORM_TEX(v.texcoord, _FlowLightMap) + frac( half2(_Scroll2X, _Scroll2Y) * _Time.x);
#endif
o.lightDirAndLM.xyz = (ObjSpaceLightDir(v.vertex));
o.lightDirAndLM.w = 0.5;
return o;
}
fixed4 frag (v2f i) : SV_Target
{
// sample the texture
fixed4 col = tex2D(_MainTex, i.uv.xy);
#if _DETAIL_ON
half3 detail = tex2D(_DetailTex, i.uv * _DetailRepeat) * 2;
// debug
//detail = lerp(detail, half3(1,1,1), wokAltitudeFogParams.w);
col.rgb *= detail * _DetailAmount + (1-_DetailAmount).xxx * _DetailColor;
#endif
#if _INVERT_ON
col = 1 - col;
#endif
col *= _TintColor;
fixed4 secCol = tex2D(_SecondTex, i.uv.zw);
#if _SNOWBLEND_ON
half colorMatch = 1 - length(col.rgb - _Color.rgb);
half3 weights = half3(i.mask.gb, colorMatch);
half weight = saturate( dot( weights, _WeightVector ) );
half colorAmount = (weight - _SnowThreshold) / _SmoothEdge;
half value = weight - _SnowThreshold;
half amount = saturate( (value - _ThresholdOffset) / _SmoothEdge );
col.rgb = lerp( col, secCol, saturate( amount * secCol.a));
#endif
#if _OVERLAY_ADD
col += secCol;
#elif _OVERLAY_MULTIPLY
col *= secCol;
#endif
#if _CHARACTER_ON
half y = 1.5;
half2 nDotLUV = 0.5 * half2( dot( normalize (i.normal), normalize(i.lightDirAndLM.xyz)) +1, y ) ;
half4 rampColor = tex2D(_RampMap, nDotLUV );
half2 flowUV = i.faceUV.xy;
half3 mask = tex2D(_MaskMap, i.uv );
half3 matcap = tex2D( _EnvMap ,i.capCoord.xy ) * mask.g;
matcap += tex2D( _EnvMap ,i.capCoord.zw) * mask.b;
col.xyz += matcap;
half4 lightFlow = tex2D (_FlowLightMap, flowUV );
float v = saturate(saturate(mask.r - _FlowThreshold));
lightFlow *= v * _FlowMultiplier;
col += lightFlow * lerp(half4(1,1,1,1), col, _FlowColor.a) * _FlowColor;
col *= (rampColor *2);
#endif
col *= _Shininess;
return col;
}
ENDCG
}
}
}