unity水面波纹着色器

#unity水波纹

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Shader "Custom/AnimTextureShader" {      Properties {          _MainTex("Base (RGB)",2D) = "white"{}        // 资源图          _NumTexTiles("Num tex tiles",Vector) = (4,4,0,0)  //图片瓦块的数量 4*4          _ReplaySpeed("Replay speed",float)  = 4       //纹理移动速度          _Color("Color",Color) = (1,1,1,1)             //背景色      }      SubShader {          Tags { "Queue"="Transparent"  "IgnoreProjector" = "True"  "RenderType"="Transparent" }          Blend One One      // 贴图和背景叠加   无Alpha透明通道处理   Blend zero one：仅显示背景的RGB部分 Blend one  zero：  仅显示贴图的RGB部分，无Alpha透明通道处理。          Cull Off           //  cull off  双面都渲染  cull back 单面渲染  Cull Front 剔除正面          Lighting Off       //关闭灯光          ZWrite Off Fog{ Color(0,0,0,0) }          CGINCLUDE          #include"UnityCG.cginc"          sampler2D _MainTex;          float4    _Color;          float4    _NumTexTiles;          float     _ReplaySpeed;          float     _Randomize;          struct v2f                {             float4 pos : SV_POSITION;  //裁剪空间中的顶点坐标             float4 uv  : TEXCOORD0;    //顶点的纹理坐标             fixed4 col : COLOR;        //顶点颜色          };          float2 Rand(float2 ij)    //得到x方向 和y 方向上的随机数          {             const float4 a = float4(97.409091034f,54.598150033f,56.205410758f,44.687805943f);             float4 result = float4(ij ,ij);             for( int i = 0; i < 2 ; i++)             {                 result.x = frac(dot(result,a));                 result.y = frac(dot(result,a));                 result.z = frac(dot(result,a));                 result.w = frac(dot(result,a));             }             return result.xy;          }          v2f vert(appdata_full v)    //顶点计算  appdata_full  可用于顶点着色器的输入           {              v2f o;              float     time  = (v.color.a*60 + _Time.y) * _ReplaySpeed;              float     itime = floor(time);              float     ntime = itime +1;              float     ftime = time - itime;              float2    texTileSize  = 1.0f / _NumTexTiles.xy;              float4    tile;  #if 0          if (_Randomize > 0)          {              itime = floor(Rand(itime) * 1000);              ntime= floor(Rand(ntime) * 1000);          }  #endif          #if 1          tile.xy = float2(itime,floor(itime /_NumTexTiles.x));          tile.zw= float2(ntime,floor(ntime /_NumTexTiles.x));          #endif          tile = fmod(tile,_NumTexTiles.xyxy);          o.pos= mul(UNITY_MATRIX_MVP, v.vertex);      // UNITY_MATRIX_MVP 用于将顶点/方向矢量从模型空间转换到剪裁空间   mul()  矩阵转换函数          o.uv    = (v.texcoord.xyxy + tile) * texTileSize.xyxy;   //得到UV值          o.col   = float4(_Color.xyz * v.color.xyz,ftime);        //得到颜色值          return o;          }          ENDCG          Pass {          CGPROGRAM          #pragma vertex vert          #pragma fragment frag          #pragma fragmentoption ARB_precision_hint_fastest        // fragmentoption 用于限制编译出的frag函数          fixed4 frag (v2f i) : COLOR    //片元计算          {              return lerp(tex2D (_MainTex, i.uv.xy),tex2D (_MainTex, i.uv.zw),i.col.a) * i.col;          }          ENDCG       }             }  }  

http://blog.csdn.net/zjw1349547081/article/details/53929610