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Hey guys,


When using D3DFMT_R16F (or another format that uses one channel) what type should I return from my pixel shader ?


Both of these seem to work the same:


float value;


return float4(value,0,0,0);

return value;


It seems more logical to use the second one but the pixel shader function returns a float4 so I don't know.




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Your pixel shader doesn't have to return a float4.


If the render target is a single float then the other values will be discarded, but there wont be any error. You can also just return a float if needed.

eg (HLSL):

float myPixelShder() : SV_TARGET0
    return 0.0f;



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