urho3d/bin/Data/PostProcess/Bloom.xml

<renderpath>
    <rendertarget name="BlurV" tag="Bloom" sizedivisor="4 4" format="rgb" filter="true" />
    <rendertarget name="BlurH" tag="Bloom" sizedivisor="4 4" format="rgb" filter="true" />
    <command type="quad" tag="Bloom" vs="Bloom" ps="Bloom" psdefines="BRIGHT" output="BlurV">
        <parameter name="BloomThreshold" value="0.3" />
        <texture unit="diffuse" name="viewport" />
    </command>
    <command type="quad" tag="Bloom" vs="Bloom" ps="Bloom" psdefines="BLURH" output="BlurH">
        <texture unit="diffuse" name="BlurV" />
    </command>
    <command type="quad" tag="Bloom" vs="Bloom" ps="Bloom" psdefines="BLURV" output="BlurV">
        <texture unit="diffuse" name="BlurH" />
    </command>
    <command type="quad" tag="Bloom" vs="Bloom" ps="Bloom" psdefines="COMBINE" output="viewport">
        <parameter name="BloomMix" value="0.9 0.4" />
        <texture unit="diffuse" name="viewport" />
        <texture unit="normal" name="BlurV" />
    </command>
</renderpath>