1 // 纹理映射的编写
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; //命名必须根据_MainTex 这里自动匹配面板的Tiling和Offset
24
25 // application to vertex
26 // 由应用程序传递给顶点函数
27 struct a2v {
28 float4 vertex:POSITION;
29 float3 normal:NORMAL;
30 float4 texcoord:TEXCOORD0; // 模型的纹理坐标
31 };
32
33 // vertex to fragment
34 // 由顶点函数传递给片元函数
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 // 将模型空间的顶点坐标变换到世界空间上
48 f.worldVertex = mul(v.vertex, unity_WorldToObject);
49 // 将纹理坐标赋值给v2f.uv并赋值面板贴图的旋转缩放
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 根据贴图获取模型纹理坐标身上对应的像素点颜色值
60 fixed3 texColor = tex2D(_MainTex,f.uv.xy) * _Color.rgb;
61
62 // 为漫反射混合上每个像素点的纹理颜色
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 }
