1 // 紋理映射的編寫
 2 Shader "TMoon/04-Texture" {
 3     Properties{
 4         _Color("Color",Color) = (1,1,1,1)
 5         _MainTex("Main Tex",2D) = "white"{}
 6     }
 7 
 8     SubShader{
 9 
10         Pass{
11         
12             Tags {"LightMode" = "ForwardBase"}
13 
14             CGPROGRAM
15 
16
 
             #include "Lighting.cginc"
17 
18             #pragma vertex vert
19             #pragma fragment frag
20 
21             fixed4 _Color;
22             sampler2D _MainTex;
23             float4 _MainTex_ST; //命名必須根據_MainTex 這裏自動匹配面板的Tiling和Offset
24 
25             // application to vertex
26
 
             // 由應用程序傳遞給頂點函數
27             struct a2v {
28                 float4 vertex:POSITION;
29                 float3 normal:NORMAL;
30                 float4 texcoord:TEXCOORD0; // 模型的紋理坐標
31             };
32 
33             // vertex to fragment
34             // 由頂點函數傳遞給片元函數
35             struct v2f {
 
36                 float4 svPos:SV_POSITION;
37                 float3 worldNormal:TEXCOORD0;
38                 float4 worldVertex:TEXCOORD1;
39                 float2 uv:TEXCOORD2;
40             };
41 
42             v2f vert(a2v v) {
43                 v2f f;
44 
45                 f.svPos = mul(UNITY_MATRIX_MVP, v.vertex);
46                 f.worldNormal = normalize(UnityObjectToWorldNormal(v.normal));
47                 // 將模型空間的頂點坐標變換到世界空間上
48                 f.worldVertex = mul(v.vertex, unity_WorldToObject);
49                 // 將紋理坐標賦值給v2f.uv並賦值面板貼圖的旋轉縮放
50                 f.uv = v.texcoord.xy * _MainTex_ST.xy + _MainTex_ST.zw;
51 
52                 return f;
53             }
54 
55             float4 frag(v2f f) : SV_Target{
56 
57                 fixed3 lightDir = normalize(WorldSpaceLightDir(f.worldVertex));
58 
59                 // tex2D 根據貼圖獲取模型紋理坐標身上對應的像素點顏色值
60                 fixed3 texColor = tex2D(_MainTex,f.uv.xy) * _Color.rgb;
61 
62                 // 為漫反射混合上每個像素點的紋理顏色
63                 fixed3 diffuse = _LightColor0.rgb * texColor * max(dot(f.worldNormal, lightDir), 0);
64 
65                 return fixed4(diffuse,1);
66             }
67 
68             ENDCG
69         }
70     }
71 
72     Fallback "VertexLit"
73 }

Unity Shader 紋理映射的實現