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Aqua Costa

[DirectX 10] Where should I create blend states

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Best is a relative term. If you would like for the Effects library to manage your state blocks for you, then use Effects. This can be nice since it allows you to see more over your overall shadering algorithm in the same place, instead of a core part of the way your algorithms work being 'hidden' in the engine code. In addition Effects already has code internal that can decide if a state needs to change for the next render pass.

But you can also manage them yourself in the engine code. There really isn't any speed benefit since Effects uses the same runtime API to set state blocks as you would. You can also write the code necessary to determine if the state even needs changing.

If you want to know how Effects works, you can look in the D3D11 SDK, the source code for Effects11 is public now.

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