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Dual Source Blending

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The D3D11_BLEND enum has member D3D11_BLEND_SRC1_COLOR which is described as:

"The data sources are both color data output by a pixel shader. There is no pre-blend operation. This options supports dual-source color blending."

What is dual-source color blending? From googling, it sounds like you can output more than one color from the pixel shader, but I thought you could only do this with MRT. What is the HLSL syntax for outputting multiple pixel color values?

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