Unity compute shader function that calculates Laplacian value

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This piece of code calculates the laplacian value of a points neighbours based on x & y co-ord passed and pixel size.



float Laplacian (sampler2D TheText, float x, float y, float2 pixsize)

 float Value=0;

 //Top Row
 Value+= tex2Dlod(TheText, float4(x+pixsize.x,y+pixsize.y,0,0)).r*0.05f;
 Value+= tex2Dlod(TheText, float4(x,y+pixsize.y,0,0)).r*0.2f;
 Value+= tex2Dlod(TheText, float4(x-pixsize.x,y+pixsize.y,0,0)).r*0.05f;

 //Middle Row
 Value+= tex2Dlod(TheText, float4(x,y,0,0)).r*-1.0f;
 Value+= tex2Dlod(TheText, float4(x+pixsize.x,y,0,0)).r*0.2f;
 Value+= tex2Dlod(TheText, float4(x-pixsize.x,y,0,0)).r*0.2f;

 //Bottom Row
 Value+= tex2Dlod(TheText, float4(x+pixsize.x,y-pixsize.y,0,0)).r*0.05f;
 Value+= tex2Dlod(TheText, float4(x,y-pixsize.y,0,0)).r*0.2f;
 Value+= tex2Dlod(TheText, float4(x-pixsize.x,y-pixsize.y,0,0)).r*0.05f;
 return Value;




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    This piece of code calculates the laplacian value of a points neighbours based on x & y co-ord passed and pixel size.



    float Laplacian (sampler2D TheText, float x, float y, float2 pixsize)

     float Value=0;

     //Top Row
     Value+= tex2Dlod(TheText, float4(x+pixsize.x,y+pixsize.y,0,0)).r*0.05f;
     Value+= tex2Dlod(TheText, float4(x,y+pixsize.y,0,0)).r*0.2f;
     Value+= tex2Dlod(TheText, float4(x-pixsize.x,y+pixsize.y,0,0)).r*0.05f;

     //Middle Row
     Value+= tex2Dlod(TheText, float4(x,y,0,0)).r*-1.0f;
     Value+= tex2Dlod(TheText, float4(x+pixsize.x,y,0,0)).r*0.2f;
     Value+= tex2Dlod(TheText, float4(x-pixsize.x,y,0,0)).r*0.2f;

     //Bottom Row
     Value+= tex2Dlod(TheText, float4(x+pixsize.x,y-pixsize.y,0,0)).r*0.05f;
     Value+= tex2Dlod(TheText, float4(x,y-pixsize.y,0,0)).r*0.2f;
     Value+= tex2Dlod(TheText, float4(x-pixsize.x,y-pixsize.y,0,0)).r*0.05f;
     return Value;




    c#




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      up vote
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      down vote

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      This piece of code calculates the laplacian value of a points neighbours based on x & y co-ord passed and pixel size.



      float Laplacian (sampler2D TheText, float x, float y, float2 pixsize)

       float Value=0;

       //Top Row
       Value+= tex2Dlod(TheText, float4(x+pixsize.x,y+pixsize.y,0,0)).r*0.05f;
       Value+= tex2Dlod(TheText, float4(x,y+pixsize.y,0,0)).r*0.2f;
       Value+= tex2Dlod(TheText, float4(x-pixsize.x,y+pixsize.y,0,0)).r*0.05f;

       //Middle Row
       Value+= tex2Dlod(TheText, float4(x,y,0,0)).r*-1.0f;
       Value+= tex2Dlod(TheText, float4(x+pixsize.x,y,0,0)).r*0.2f;
       Value+= tex2Dlod(TheText, float4(x-pixsize.x,y,0,0)).r*0.2f;

       //Bottom Row
       Value+= tex2Dlod(TheText, float4(x+pixsize.x,y-pixsize.y,0,0)).r*0.05f;
       Value+= tex2Dlod(TheText, float4(x,y-pixsize.y,0,0)).r*0.2f;
       Value+= tex2Dlod(TheText, float4(x-pixsize.x,y-pixsize.y,0,0)).r*0.05f;
       return Value;




      c#




      share|improve this question













      This piece of code calculates the laplacian value of a points neighbours based on x & y co-ord passed and pixel size.



      float Laplacian (sampler2D TheText, float x, float y, float2 pixsize)

       float Value=0;

       //Top Row
       Value+= tex2Dlod(TheText, float4(x+pixsize.x,y+pixsize.y,0,0)).r*0.05f;
       Value+= tex2Dlod(TheText, float4(x,y+pixsize.y,0,0)).r*0.2f;
       Value+= tex2Dlod(TheText, float4(x-pixsize.x,y+pixsize.y,0,0)).r*0.05f;

       //Middle Row
       Value+= tex2Dlod(TheText, float4(x,y,0,0)).r*-1.0f;
       Value+= tex2Dlod(TheText, float4(x+pixsize.x,y,0,0)).r*0.2f;
       Value+= tex2Dlod(TheText, float4(x-pixsize.x,y,0,0)).r*0.2f;

       //Bottom Row
       Value+= tex2Dlod(TheText, float4(x+pixsize.x,y-pixsize.y,0,0)).r*0.05f;
       Value+= tex2Dlod(TheText, float4(x,y-pixsize.y,0,0)).r*0.2f;
       Value+= tex2Dlod(TheText, float4(x-pixsize.x,y-pixsize.y,0,0)).r*0.05f;
       return Value;





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      edited May 21 at 7:53









      RobH

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      asked May 21 at 7:12









      Munkybunky

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