前言
记录学习玩基础篇，书写的Shader
代码
Shader "MyShader/TheShader"
{
Properties
{
_Color("Color Tint",Color)=(1,1,1,1)
_MainTex ("Texture", 2D) = "white" {}
_Specular("Specular",Color)=(1,1,1,1)
_Gloss("Gloss",Range(8.0,256))=20
_BumpedTex("Normal Tex",2D)="bump"{}
_BumpedScale("BumpedScale",float)=1
}
SubShader
{
Tags { "RenderType"="Opaque" "Queue"= "Geometry" }
Pass
{
Name "ShadowCaster"
Tags {"LightMode" = "ShadowCaster"}
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_shadowcaster
#include "UnityCG.cginc"
struct v2f{
V2F_SHADOW_CASTER;
};
v2f vert(appdata_base v)
{
v2f o;
TRANSFER_SHADOW_CASTER_NORMALOFFSET(o);
return o;
}
float4 frag(v2f i) : SV_Target
{
SHADOW_CASTER_FRAGMENT(i)
}
ENDCG
}
Pass
{
Tags{"LightMode"="ForwardBase" }
CGPROGRAM
#pragma multi_compile_fwdbase
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
#include "Lighting.cginc"
#include "AutoLight.cginc"
fixed4 _Color;
sampler2D _MainTex;
float4 _MainTex_ST;
fixed4 _Specular;
float _Gloss;
sampler2D _BumpedTex;
float4 _BumpedTex_ST;
float _BumpedScale;
struct appdata
{
float4 vertex : POSITION;
float3 normal : NORMAL;
float4 tangent : TANGENT;
float4 uv : TEXCOORD0;
};
struct v2f
{
float4 pos : SV_POSITION;
float4 uv : TEXCOORD0;
float4 TtoW0: TEXCOORD1;
float4 TtoW1: TEXCOORD2;
float4 TtoW2: TEXCOORD3;
SHADOW_COORDS(4)
};
v2f vert (appdata v)
{
v2f o;
o.pos = UnityObjectToClipPos(v.vertex);
o.uv.xy = v.uv.xy * _MainTex_ST.xy +_MainTex_ST.zw;
o.uv.zw = TRANSFORM_TEX(v.uv,_BumpedTex).xy;
float3 worldPos = mul(unity_ObjectToWorld,v.vertex).xyz;
fixed3 worldNormal = UnityObjectToWorldNormal(v.normal);
fixed3 worldTangent = UnityObjectToWorldDir(v.tangent.xyz);
fixed3 worldBinormal = cross(worldNormal,worldTangent) * v.tangent.w;
o.TtoW0 = float4(worldTangent.x,worldBinormal.x,worldNormal.x,worldPos.x);
o.TtoW1 = float4(worldTangent.y,worldBinormal.y,worldNormal.y,worldPos.y);
o.TtoW2 = float4(worldTangent.z,worldBinormal.z,worldNormal.z,worldPos.z);
TRANSFER_SHADOW(o);
return o;
}
fixed4 frag (v2f i) : SV_Target
{
float3 worldPos = float3(i.TtoW0.w,i.TtoW1.w,i.TtoW2.w);
fixed3 lightDir = normalize(UnityWorldSpaceLightDir(worldPos));
fixed3 viewDir = normalize(UnityWorldSpaceViewDir(worldPos));
fixed3 adelbo = tex2D(_MainTex, i.uv.xy).rgb * _Color.rgb;
fixed3 bump = UnpackNormal(tex2D(_BumpedTex,i.uv.zw));
bump.xy *= _BumpedScale;
bump.z = sqrt(1-saturate(dot(bump.xy,bump.xy)));
bump = normalize(half3(dot(i.TtoW0.xyz,bump),dot(i.TtoW1.xyz,bump),dot(i.TtoW2.xyz,bump)));
fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.rgb * adelbo.rgb ;
fixed3 diffuse = _LightColor0.rgb * adelbo.rgb * saturate(dot(bump,lightDir));
fixed3 halfDir = normalize(lightDir+viewDir);
fixed3 specular = _LightColor0.rgb * _Specular.rgb * pow(saturate(dot(bump,halfDir)),_Gloss);
UNITY_LIGHT_ATTENUATION(atten,i,worldPos);
return fixed4(ambient+(diffuse+specular)*atten , 1.0);
}
ENDCG
}
Pass
{
Tags{"LightMode"="ForwardAdd" }
Blend One One
CGPROGRAM
//#pragma multi_compile_fwdadd
#pragma multi_compile_fwdadd_fullshadows
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
#include "Lighting.cginc"
#include "AutoLight.cginc"
fixed4 _Color;
sampler2D _MainTex;
float4 _MainTex_ST;
fixed4 _Specular;
float _Gloss;
sampler2D _BumpedTex;
float4 _BumpedTex_ST;
float _BumpedScale;
struct appdata
{
float4 vertex : POSITION;
float3 normal : NORMAL;
float4 tangent : TANGENT;
float4 uv : TEXCOORD0;
};
struct v2f
{
float4 pos : SV_POSITION;
float4 uv : TEXCOORD0;
float4 TtoW0: TEXCOORD1;
float4 TtoW1: TEXCOORD2;
float4 TtoW2: TEXCOORD3;
SHADOW_COORDS(4)
};
v2f vert (appdata v)
{
v2f o;
o.pos = UnityObjectToClipPos(v.vertex);
o.uv.xy = v.uv.xy * _MainTex_ST.xy +_MainTex_ST.zw;
o.uv.zw = TRANSFORM_TEX(v.uv,_BumpedTex).xy;
float3 worldPos = mul(unity_ObjectToWorld,v.vertex).xyz;
fixed3 worldNormal = UnityObjectToWorldNormal(v.normal);
fixed3 worldTangent = UnityObjectToWorldDir(v.tangent.xyz);
fixed3 worldBinormal = cross(worldNormal,worldTangent) * v.tangent.w;
o.TtoW0 = float4(worldTangent.x,worldBinormal.x,worldNormal.x,worldPos.x);
o.TtoW1 = float4(worldTangent.y,worldBinormal.y,worldNormal.y,worldPos.y);
o.TtoW2 = float4(worldTangent.z,worldBinormal.z,worldNormal.z,worldPos.z);
TRANSFER_SHADOW(o);
return o;
}
fixed4 frag (v2f i) : SV_Target
{
float3 worldPos = float3(i.TtoW0.w,i.TtoW1.w,i.TtoW2.w);
fixed3 lightDir = normalize(UnityWorldSpaceLightDir(worldPos));
fixed3 viewDir = normalize(UnityWorldSpaceViewDir(worldPos));
fixed3 adelbo = tex2D(_MainTex, i.uv.xy).rgb * _Color.rgb;
fixed3 bump = UnpackNormal(tex2D(_BumpedTex,i.uv.zw));
bump.xy *= _BumpedScale;
bump.z = sqrt(1-saturate(dot(bump.xy,bump.xy)));
bump = normalize(half3(dot(i.TtoW0.xyz,bump),dot(i.TtoW1.xyz,bump),dot(i.TtoW2.xyz,bump)));
fixed3 diffuse = _LightColor0.rgb * adelbo.rgb * saturate(dot(bump,lightDir));
fixed3 halfDir = normalize(lightDir+viewDir);
fixed3 specular = _LightColor0.rgb * _Specular.rgb * pow(saturate(dot(bump,halfDir)),_Gloss);
UNITY_LIGHT_ATTENUATION(atten,i,worldPos);
return fixed4((diffuse+specular)*atten , 1.0);
}
ENDCG
}
}
FallBack "Specular"
}