庄懂 TA Lesson 8

oldschool Pro 有参考苏格拉底代码格式

Shader "Shader/OldSchoolPro"
{
    Properties
    {
        _SpecularPow("SpecularPower",range(1,99)) = 30    //面板需要的参数
        _EnvIntensity("EnvIntensity",range(0,1)) = 0.3
        _BaseColor("BaseColor",color) = (1.0,1.0,1.0,1.0)
        _LigCol("LightColor",color) = (1.0,1.0,1.0,1.0)
        _TopCol("TopColor",color) = (1.0,1.0,1.0,1.0)
        _BottomCol("BottomColor",color) = (1.0,1.0,1.0,1.0)
        _SideCol("SideColor",color) = (1.0,1.0,1.0,1.0)
        _Occlusion("AO",2d) ="white"{} 
    }
    SubShader
    {
        Name "FORWARD"
        Tags {
            "LightMode"="ForwardBase"
        }
        Pass
        {
            
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"
            #include "AutoLight.cginc" 
            #include "Lighting.cginc"
            #pragma multi_compile_fwdbase_fullshadows
            #pragma target 3.0

            float _SpecularPow;    //声明变量
            float _EnvIntensity;
            sampler2D _Occlusion;
            float3 _BaseColor;
            float3 _LigCol;
            float3 _TopCol;
            float3 _BottomCol;
            float3 _SideCol;

            struct vertexInput
            {
                float4 vertex : POSITION;
                float3 normal : NORMAL;
                float2 uv0 : TEXCOORD0;//模型的uv信息，输入的这几个值对应的名称都是固定好的，不像输出可以修改
            };

            struct vertexOutput
            {
                float4 pos :SV_POSITION;//裁剪空间顶点坐标
                float4 posWS : TEXCOORD0;//世界空间顶点坐标
                float3 nDirWS : TEXCOORD1;//世界空间法线坐标
                float2 uv : TEXCOORD2;
                LIGHTING_COORDS(3,4)    //投影相关，34编号是顺着012这样排下来的
            };

            
            vertexOutput vert (vertexInput v)
            {
                vertexOutput o = (vertexOutput)0;
                o.pos = UnityObjectToClipPos(v.vertex);
                o.posWS = mul(unity_ObjectToWorld,v.vertex);
                o.nDirWS = UnityObjectToWorldNormal(v.normal);
                o.uv = v.uv0;
                TRANSFER_VERTEX_TO_FRAGMENT(o)  //投影相关
                return o;
            }

            fixed4 frag (vertexOutput i) : SV_Target
            {
                //准备
                float3 nDir = normalize(i.nDirWS);
                float3 lDir = _WorldSpaceLightPos0.xyz;
                float3 vDir = normalize(_WorldSpaceCameraPos.xyz-i.posWS.xyz);
                float3 rDir = reflect(-lDir, nDir);
                
                //计算
                float nDotl = dot(nDir,lDir);
                float vDotr = dot(vDir,rDir);

                //Phong+lambert
                float Phong = pow(max(0.0,vDotr),_SpecularPow);
                float lambert = max(0.0, nDotl);
                float shadow = LIGHT_ATTENUATION(i);
                float3 DirectLight = (_BaseColor * lambert + Phong) * _LigCol * shadow;

                //计算遮罩
                float topmask = max(0.0,nDir.g);
                float bottommask = max(0.0,-nDir.g);
                float sidemask = 1.0 - topmask - bottommask;

                //混色
                float totalmask = _TopCol*topmask + _BottomCol*bottommask + _SideCol*sidemask;
                float3 envColor = mul(_BaseColor,mul(_EnvIntensity,totalmask));

                //采样occlusion
                float occlusion = tex2D(_Occlusion,i.uv);
                float3 EnvLight = envColor * occlusion;

                //Final
                float3 FinalRGB =DirectLight + EnvLight;

                return float4(FinalRGB,1.0);
            }
            ENDCG
        }
    }
}