<renderpath>
    <command type="quad" enabled="true" tag="TonemapReinhardEq3" vs="Tonemap" ps="Tonemap" psdefines="REINHARDEQ3" output="viewport">
        <parameter name="TonemapExposureBias" value="1.0" />
        <texture unit="diffuse" name="viewport" />
    </command>
    <command type="quad" enabled="false" tag="TonemapReinhardEq4" vs="Tonemap" ps="Tonemap" psdefines="REINHARDEQ4" output="viewport">
        <parameter name="TonemapExposureBias" value="1.0" />
        <parameter name="TonemapMaxWhite" value="8.0" />
        <texture unit="diffuse" name="viewport" />
    </command>
    <command type="quad" enabled="false" tag="TonemapUncharted2" vs="Tonemap" ps="Tonemap" psdefines="UNCHARTED2" output="viewport">
        <parameter name="TonemapExposureBias" value="1.0" />
        <parameter name="TonemapMaxWhite" value="4.0" />
        <texture unit="diffuse" name="viewport" />
    </command>
</renderpath>
