// Upgrade NOTE: commented out 'float4 unity_LightmapST', a built-in variable// Upgrade NOTE: commented out 'sampler2D unity_Lightmap', a built-in variableShader "Sbin/TexShader2"{	Properties	{		_MainTex ("Texture", 2D) = "white" {}	}	SubShader	{		Pass		{			CGPROGRAM			#pragma vertex vert			#pragma fragment frag			#include "UnityCG.cginc"			sampler2D _MainTex;			float4 _MainTex_ST;//纹理缩放偏移向量(Unity默认此变量赋值,变量名规则：纹理名_ST)			// sampler2D unity_Lightmap;//若开启光照贴图，系统默认填值			// float4 unity_LightmapST;//与上unity_Lightmap同理			struct v2f{				float4 pos:POSITION;				float2 uv:TEXCOORD0;				float2 uv2:TEXCOORD1;			};			v2f vert (appdata_full v)			{				v2f o;				o.pos = mul(UNITY_MATRIX_MVP, v.vertex);				//第一种方式：				//o.uv = v.texcoord.xy * _MainTex_ST.xy + _MainTex_ST.zw;				//第二种方式：内建宏，双方和第一种一样，只是对第一种计算的封装				o.uv = TRANSFORM_TEX(v.texcoord,_MainTex);				o.uv2 = v.texcoord1.xy * unity_LightmapST.xy + unity_LightmapST.zw;				return o;			}			fixed4 frag (v2f v) : COLOR			{				//解密光照贴图计算公式				float3 lightmapColor = DecodeLightmap(UNITY_SAMPLE_TEX2D(unity_Lightmap,v.uv2)); 				fixed4 col = tex2D(_MainTex, v.uv);//第一个参数：纹理，第二个参数UV向量				col.rgb *= lightmapColor;				return col;			}			ENDCG		}	}}