I have simple blur shader which I calculate offsets in:

Piece of vertex shader:

output.texCoord1 = input.tex + float2( texelSize * -4.0f, 0.0f );
output.texCoord12 = input.tex + float2( texelSize * -3.0f, 0.0f );
output.texCoord13 = input.tex + float2( texelSize * -2.0f, 0.0f );
output.texCoord14 = input.tex + float2( -texelSize, 0.0f );
output.texCoord15 = input.tex + float2( 0.0f, 0.0f );
output.texCoord16 = input.tex + float2( texelSize, 0.0f );
output.texCoord17 = input.tex + float2( texelSize *  2.0f, 0.0f );
output.texCoord18 = input.tex + float2( texelSize *  3.0f, 0.0f );
output.texCoord19 = input.tex + float2( texelSize *  4.0f, 0.0f );

However with this manner I have artifacts on the sides of the screen:


I know that it occurs because when the offset goes out from the right it takes pixels from the left appropriately.

So my question is: how is the "standard" way to deal with this? I was trying to saturate() all of the values assigned to output.texCoordX, it removes the artifacts in 95%, but it makes my blur much weaker and with strange sharper edges ("roll my log and I will roll yours"?).


1 Answer 1


Wouldn't setting your texture's edge mode to clamp (instead of repeat) solve this issue?

  • \$\begingroup\$ oh my god that was so easy, I just have forgotten that sampler field, thank you \$\endgroup\$
    – tobi
    Jan 21, 2013 at 10:14

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