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  1. PO
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    <p>The general idea is to render the white text first, then blur it. And finally to use the blurred white text as the background image for the black text.</p> <p>Your shader is a correct blur, but it's somewhat inefficient (redundant samples for x=0, for example). You can create a good large blur with two passes: one horizontal and one vertical blur. HLSL code:</p> <pre><code>float4 PS_BlurHorizontal( float2 Tex : TEXCOORD0 ) : COLOR0 { float Color = 0.0f; Color += tex2D(sampler, float2(Tex.x - 3.0*blurSizeX, Tex.y)) * 0.09f; Color += tex2D(sampler, float2(Tex.x - 2.0*blurSizeX, Tex.y)) * 0.11f; Color += tex2D(sampler, float2(Tex.x - blurSizeX, Tex.y)) * 0.18f; Color += tex2D(sampler, Tex) * 0.24f; Color += tex2D(sampler, float2(Tex.x + blurSizeX, Tex.y)) * 0.18f; Color += tex2D(sampler, float2(Tex.x + 2.0*blurSizeX, Tex.y)) * 0.11f; Color += tex2D(sampler, float2(Tex.x + 3.0*blurSizeX, Tex.y)) * 0.09f; return Color; } float4 PS_BlurVertical( float2 Tex : TEXCOORD0 ) : COLOR0 { float Color = 0.0f; Color += tex2D(sampler, float2(Tex.x, Tex.y - 3.0*blurSizeY)) * 0.09f; Color += tex2D(sampler, float2(Tex.x, Tex.y - 2.0*blurSizeY)) * 0.11f; Color += tex2D(sampler, float2(Tex.x, Tex.y - blurSizeY)) * 0.18f; Color += tex2D(sampler, Tex) * 0.24f; Color += tex2D(sampler, float2(Tex.x, Tex.y + blurSizeY)) * 0.18f; Color += tex2D(sampler, float2(Tex.x, Tex.y + 2.0*blurSizeY)) * 0.11f; Color += tex2D(sampler, float2(Tex.x, Tex.y + 3.0*blurSizeY)) * 0.09f; return Color; } // weights: 0.09 + 0.11 + 0.18 + 0.24 + 0.18 + 0.11 + 0.9 = 1 // By default, weigths are symmetrical and sum up to 1, // but they don't necessarily have to. // You can change the weights to create more fancy results. </code></pre> <p>These two 7-sample passes simulate a 7x7 gaussian blur (14 samples instead of 49). You can use more samples to improve the result (make blur wider) or just adjust the weights to create more soft look.</p>
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    1. POHow to make Outer Glow Effect using HLSL?
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    1. POHow to make Outer Glow Effect using HLSL?
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    1. COSounds great! But it is generally impossible to have multi-pass shader for WPF BitmapEffect :( there are some tips and descriptions: http://www.codeproject.com/Articles/71617/Getting-Started-with-Shader-Effects-in-WPF For now performance is not a problem since a have small amount of text and small amount of bitmaps to render. It would be great if you can help create a single-pass function for rendering text with blurred background.
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      1. USDmitry Gusarov
    2. COyou don't have to create a multi-pass shader, what you do is: 1. blur the original image with `PS_BlurHorizontal`, 2. blur the result of the previous step with `PS_BlurVertical`. if you need a single pass, take a look at this: http://code.google.com/p/sbip/source/browse/trunk/SBIPFramework/Resources/GaussianBlur.fx?r=76
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