Shader-基础纹理-凹凸映射

Shader "Unlit/SingleTexture"
{
    Properties{
        _Color("Color Tint",Color) = (1,1,1,1)
        _MainMap("Main Tex", 2D) = "white"{}
        _BumpMap("NormalMap",2D) = "bump"{}
        _BumpScale("Bump Scale" , Float) = 1.0
        _Specular("Specular",Color) = (1,1,1,1)
        _Gloss("Gloss",Range(8.0,256)) = 20
    }
        SubShader{
            Pass{
                Tags { "LightMode" = "ForwardBase"}
                CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag
                #include "Lighting.cginc"

                fixed4 _Color;
                sampler2D _MainTex;
                float4 _MainTex_ST;
                sampler2D _BumpMap;
                float4 _BumpMap_ST;
                float _BumpScale;
                fixed4 _Specular;
                float _Gloss;


                
                struct a2v {
                    float4 vertex : POSITION;
                    float3 normal : NORMAL;
                    float4 tangent : TANGENT;
                    float4 texcoord : TEXCOORD0;
                };
                
                struct v2f {
                    float4 pos : SV_POSITION;
                    float4 uv : TEXCOORD0;
                    float3 lightDir: TEXCOORD1;
                    float3 viewDir : TEXCOORD2;
                };
                v2f vert(a2v v) {
                    v2f o;
                    o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
                    o.uv.xy = v.texcoord.xy * _MainTex_ST.xy + _MainTex_ST.zw;
                    o.uv.zw = v.texcoord.xy * _BumpMap_ST.xy + _BumpMap_ST.zw;

                    TANGENT_SPACE_ROTATION;
                    o.lightDir = mul(rotation, ObjSpaceLightDir(v.vertex)).xyz;
                    o.viewDir = mul(rotation, ObjSpaceViewDir(v.vertex)).xyz;
                    return o;
                }
                fixed4 frag(v2f i):SV_Target {
                    fixed3 tangentLightDir = normalize(i.lightDir);
                    fixed3 tangentViewDir = normalize(i.viewDir);
                    fixed4 packedNormal = tex2D(_BumpMap, i.uv.zw);
                    fixed3 tangentNormal;

                    tangentNormal.xy = (packedNormal.xy * 2 - 1)* _BumpScale;
                    tangentNormal.z = sqrt(1.0 - saturate(dot(tangentNormal.xy, tangentNormal.xy)));

                    /*tangentnormal = unpacknormal(packednormal);
                    tangentnormal.xy *= _Bumpscale;
                    tangentnormal.z = sqrt(1.0 - saturate(dot(tangentnormal.xy, tangentnormal.xy)));*/

                    fixed3 albedo = tex2D(_MainTex, i.uv).rgb*_Color.rgb;
                    fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT * albedo;
                    fixed3 diffuse = _LightColor0.rgb * albedo * max(0, dot(tangentNormal, tangentLightDir));
                    fixed3 halfDir = normalize(tangentLightDir + tangentViewDir);
                    
                    float temp = max(0, dot(tangentNormal, halfDir));
                    fixed3 specular = _LightColor0.rgb * _Specular.rgb * pow(temp, _Gloss);
                    return fixed4(ambient + diffuse + specular, 1.0);
                }
                ENDCG
            }
        }
}